Protection Interview Question Book

MCQs Power Protection Engineering Knowledge (Translated) Engr. Qazi Arsalan Hamid Protection Engineer Oman MEM(NED) BE(MUET)

Article 1 Relay No. 50 (Relay Device Number 50) me ans nothing relays.

Answer 1: Undervoltage Relay Answer 2: Instantaneous Overcurrent Relay. Answer 3: AC Time Overcurrent Relay. Answer 4: Frequency Relay Article: 2 Which is not a way to detect faults (Faults) in the electrical system o f the relay.

Answer 1: level measurement (Level Detection). Answer 2: Comparison of different streams (Differential Current Comparison). Answer 3: Comparison of phase (Phase Angle Comparison). Answer 4: Compare the speed of the flow of current when a short circuit occurs. Article: 3 Standard IEC 60617 (IEC Relay Symbols) of the relay shown. Means any relay

Answer 1: Negative Sequence Relay. Answer 2: Differential Relay Answer 3: Definite Time Earth Fault Over current Relay. Answer 4: Directional Overcurrent Relay. Article: 4 Overcurrent Relays without direction Principle detecting faults (Faults) in any way.

Answer 1: level measurement. Answer 2: Comparison of phase angle. Answer 3: Comparison with power. Answer 4: Comparison of different flows. Article: 5 Under Voltage Relay principles detecting faults (Faults) in any way.

Answer 1: Comparison of phase angle.

Answer 2: Comparison of different flows. Answer 3: Comparison with power. Answer 4: level measurement. Article: 6 Pick up Value of the r elay means either.

Answer 1: Setting up a relay to stop working. Answer 2: The value adjustment to compensate for improved functionality of the relay. Answer 3: Setting the relay to start. Answer 4: The multiplier is set to accelerate faster relay reduces the damage to a minimum. Article: 7 Which is not to relay Distance Relay.

Answer 1: Quadrilateral Answer 2: Lenticular Answer 3: Mho Answer 4: High Impedance Relay. Article: 8 Relay type the following principles in Electrical Faults detected by comparing the size

(Magnitude Comparison). Answer 1: Directional Overcurrent Relay. Answer 2: Distance Relay Answer 3: Current Balance Relay. Answer 4: Differential Relay electr ical system by comparing the phase (Phase Angle Comparison) is Article: 9 Detecting Faults in the electrical generally used to compare any quantity for phase angle. Answer 1: Use the electrical current and voltage. Answer 2: Use the power and electricity. Answer 3: Use the power and voltage. Answer 4: Use the current Positive Sequence Negative Sequence and when Fault. Article: 10 Which of the following types of relay Faults detection principle used by way of comparison

phase (Phase Angle Comparison) used in conjunction with.

Answer 1: Differential Relay Answer 2: Directional Overcurrent Relay. Answer 3: Frequency Relay Answer 4: Current Balance Relay. Article: 11 Which of the following Electromagnetic Relays break from reality.

Answer 1: Electromagnetic Induction Relay relies on gravity, electromagnetic force to change the status Relay Contact. Answer 2: Electromechanical Relay or the attractive force, torque, electrical, mechanical relays made. Answer 3: Electromagnetic Attraction Relay to work immediately. (Instantaneous) without delay. Answer 4: Electromechanical Relay Relay old. Can not save any more power. Article: 12 Which is not a feature of the Digital Relay.

Answer 1: The Multiphase Multifunction Relay. Answer 2: can save events or o r statistical data Fault in the system. Answer 3: You can measure and display the amount of electrical power systems, such as flow, pressure, and volt-amperes. Answer 4: A Single Phase / Single Function Relay. Article: 13 Which of the following types of relay The principle is the volume flow And pressure to urge

the relay. Answer 1: distance relay (Distance Relay). Answer 2: Relay flow measurement differences (Current Differential Relay). Answer 3: Relay detects low frequency. (Underfrequency Relay) Answer 4: overcurrent relays re lays without direction. (Non-Directional Overcurrent Relay). Article: 14 Relay Number 87 standard ANSI Standard refers to any type of relay.

Answer 1: Instantaneous Overcurrent Relay. Answer 2: Distance Relay Answer 3: Differential Protective Relay. Answer 4: Reverse-Phase or Phase-Balance Current Relay.

Article: 15 Relay Number 51 standard ANSI Standard refers to any type of relay.

Answer 1: Ground Protective Relay. Answer 2: AC Time Overcurrent Relay. Answer 3: Reverse-Phase or Phase-Balance Current Relay. Answer 4: Instantaneous Overcurrent Relay. Article: 16 Relay Number 21 standard ANSI Standard refers to any type of relay.

Answer 1: Ground Protective Relay. Answer 2: AC Time Overcurrent Relay. Answer 3: Distance Relay Answer 4: Reverse-Phase or Phase-Balance Current Relay. Article: 17 Relay Number 67 standard ANSI Standard refers to any type of relay.

Answer 1: AC Time Overcurrent Relay. Answer 2: Reverse-Phase or Phase-Balance Current Relay. Answer 3: Ground Protective Relay. Answer 4: AC Directional Overcurrent Relay. Article: 18 Relay Number 49 standard ANSI Standard refers to any type of relay.

Answer 1: Thermal Relay Answer 2: Under Voltage Relay. Answer 4: Ground Protective Relay. Article: 19 What is the principle of detect ing a fault (Detection of Fault) Relay.

Answer 1: Relay operation when the e lectrical system is higher than the l evel set. Answer 2: Relay operation when the e lectrical system is well below the level se t. Answer 3: Relay working on the second volume of electricity is very different t han the setting. Answer 4: All of the above. Article: 20 High Impedance Relay is a relay of any kind.

Answer 1: distance relay (Distance Relay). Answer 2: Relay differences (Differential Relay). Answer 3: reactance relay (Reactance Relay). Answer 4: The relay's impedance (Impedance Relay). Article: 21 The main device used to prote ct the electrical system what.

Answer 1: Fuse, Circuit Breaker and Cutout. Answer 2: Fuse, Circuit Breaker and Delay. Answer 3: Fuse, Circuit Breaker and Relay. Answer 4: Circuit Breaker, Cutout and Relay. Article: 22 Which of the following devices. That is not a basis for power system protection.

Answer 1: Fuse Answer 2: Relay Answer 3: Circuit breakers. Answer 4: magnetic contactor. t he relay. Article: 23 Relay type Electro-mechanical Relay High Speed Relay want to have to use any of the Answer 1: A Split Ring. Answer 2: Induction Disc. Answer 3: Induction Cup. Answer 4: an Attractive Armature. Article: 24 The current transformer (CT) to detect Zero-Sequence is useful.

Answer 1: The anti-Phase Fault. Answer 2: To protect Earth Fault. Answer 3: The Protection Under Voltage. Answer 4: In order to prevent a Differential. Article: 25 Voltage Relay can not be used in any of the following.

Answer 1: detection before making S ynchronism Check. Answer 2: Use the detection phase. Answer 3: Check the heat disorders with Bimetal. Answer 4: using detectors to prevent Motor start-up time. Article: 26 Detecting Faults general principles of the relay. The electrical system is grounded for good.

Often the quantitative detection of the power of any value. Answer one: the streams rose, and the pressure increases. Answer 2: increasing the flow and pressure drop. Answer 3: increasing the flow and increasing r esistance. Answer 4: The current rise and power increased. Article: 27 Voltage Restraint Overcurrent Relay amount of any Pick up Value.

Answer 1: Both current and frequency. fr equency. Changing Answer 2: Use both voltage and fre quency. Changing Answer 3: Both the current curre nt and voltage. Changing Answer 4: I use both current and impedance. Changing pr otect any of the following. Article: 28 Pressure Relay used to protect Answer 1: generator. Answer 2: transformer oil is an insulator. Answer 3: capacitor. Answer 4: a device used SF6 gas insulated. Article: 29 Relay Number 46 standard ANSI St andard refers to any type of relay.

Answer 1: Negative Sequence Current Relay. Answer 2: Negative Sequence Voltage Relay. Answer 3: Zero Sequence Current Relay. Answer 4: Zero Sequence Voltage Relay. Article: 30 Relay Number 47 standard ANSI Standard refers to any type of relay.

Answer 1: Negative Sequence Current Relay. Answer 2: Negative Sequence Voltage Relay. Answer 3: Zero Sequence Current Relay. Answer 4: Zero Sequence Voltage Relay. Article: 31 Relay Number 81U standard ANSI Standard m eans a relay of any kind.

Answer 1: Under Frequency Relay. Answer 2: Over Frequency Relay. Answer 3: Differential Relay Answer 4: Regulating Relay Article: 32 Relay Number 40 standard ANSI St andard refers to any type of relay.

Answer 1: Frequency Relay Answer 2: Regulating Relay Answer 3: Lockout Relay Answer 4: Loss of Field Relay. Article: 33 Relay Number 27 standard ANSI Standard refers to any type of relay.

Answer 1: Under Frequency Relay. Answer 2: Over Frequency Relay. Answer 3: Under Voltage Relay. Answer 4: Over Voltage Relay. Article: 34 Relay Number 59 standard ANSI Standard refers to any type of relay.

Answer 1: Under Frequency Relay. Answer 2: Over Frequency Relay. Answer 3: Under Voltage Relay. Answer 4: Over Voltage Relay. Article: 35 Relay Number 50N standard ANSI Standard means a relay of any kind.

Answer 1: Instantaneous Over Current Relay. Answer 2: Time Delay Over Current Relay. Answer 3: Instantaneous Earth Fault Relay. Answer 4: Time Delay Earth Fault Re lay. Article: 36 Relay Number 51V standard ANSI St andard means a relay of any kind.

Answer 1: Time Delay Over Current Relay. Answer 2: Time Delay Over Voltage Relay. Answer 3: Voltage Restraint Over Current Relay. Answer 4: Time Delay Earth Fault Re lay. Article: 37 ANSI Standard 52 compliant device ID refers to any device.

Answer 1: Current Operated Circuit Breaker. Answer 2: Relay Operated Circuit Breaker. Answer 3: Thermally Operated Circuit Breaker. Answer 4: Voltage Operated Circuit Breaker. Article: 38 Static Relays relay any means.

Answer 1: Electromechanical Relays Answer 2: Solid State Relays. Answer 3: Digital Relays Answer 4: Numerical Relays t he relay Microprocessor or Digital Relays in use today are comprised Article: 39 Within the structure of the of Isolation Transformers to do anything. Answer 1: Use a noise filter before entering the relay. Answer 2: Use a separate circuit and to reduce the signs before the relay. Answer 3: Use the power electronic circuits within the relay. Answer 4: Use the signal within the relay.

Article: 40 Within the structure of the relay Microprocessor or Digital Relays used in modern times to

include Anti - Alias Filter to do anything. Answer 1: Use a noise filter before entering the relay. Answer 2: Use a separate circuit and to reduce the signs before the relay. Answer 3: Use the power electronic circuits within the relay. Answer 4: Use the signal within the relay. Article: 41 Relay Number 21N standard ANSI Standard means a relay of any kind.

Answer 1: Ground Fault Over Voltage Vo ltage Relay. Answer 2: Ground Fault Under Voltage V oltage Relay. Answer 3: Ground Fault Distance Relay. Answer 4: Ground Fault High Impedance Relay. Article: 42 Over-Voltage Relay will resume Contact type "a" to each other when.

Answer 1: voltage reaches a preset value. Answer 2: High voltage exceeds a preset value. Answer 3: voltage is lower than the set value. Answer 4: pressure dropping to zero. Article: 43 The main function of the Relays

Answer 1: a cutting device direc tly on the circuit Faults. Answer 2: The Circuit Breaker is a circuit breaker when the Faults. Answer 3: a device to detect the position of the Faults in t he power system. Answer 4: a device fault occurred in the electrical system. Article: 44 The device uses data analysis and signal processing within the Digital Relays.

Answer 1: Memory Unit Answer 2: Microprocessor Unit Answer 3: Analog to Digital Converter. Answer 4: Sample and Hold Device.

Article: 45 Directional Power Relay (32) used in the following cases.

Answer 1: used to detect the direction of power flow. Answer 2: Use the measuring of electric power. Answer 3: In case you want to do. Synchronization System Answer 4: used to detect overload conditions in electric motors. Article: 46 How does the following That is used to detect the Earth Fault Overcurrent Relay.

Answer 1: Detection Positive Sequence Current. Answer 2: sensing the residual (Residual Current). Answer 3: Sensing the Ground Return. Answer 4: Detection Zero Sequence Current. Article: 47 Relay Number 81O standard ANSI Standard means a relay o f any kind.

Answer 1: Under Frequency Relay. Answer 2: Over Frequency Relay. Answer 3: Differential Relay Answer 4: Regulating Relay Article: 48 Relays evolution from past to present. There are some groups

Answer 1: Electromechanical Relay, Static Relay, Digital Relay and Numerical Relay. Answer 2: Solid-state Relay, Static Relay and Digital Relay. Answer 3: Static Relay, Digital Relay and Numerical Relay. Answer 4: Electromechanical Relay, Static Relay and Digital Relay. Article: 49 The relay of any kind to use the Impedance Pick up the t he volume so that the relay.

Answer 1: Overcurrent Relay Answer 2: Differential Relay Answer 3: Distance Relay Answer 4: Under Voltage Relay.

Article: 50 Device ID Number 52-a standard ANSI Standard refers to any type of device.

Answer 1: Auxiliary Contact normally open (Normally Open). Answer 2: Auxiliary Contact normally closed (Normally Close). Answer 3: Auxiliary Relay Normally Open (Normally Open). Answer 4: Auxiliary Relay is normally closed (Normally Close). Article: 51 Device ID No. 52-b standard ANSI Standard refers to any type of device.

Answer 1: Auxiliary Contact normally open (Normally Open). Answer 2: Auxiliary Contact normally closed (Normally Close). Answer 3: Auxiliary Relay Normally Open (Normally Open). Answer 4: Auxiliary Relay is normally closed (Normally Close). Article: 52 Under-Voltage Relay is activated when the pressure is lower than the value set by the.

Answer 1: The relay Contact type "a" to each other. Answer 2: The relay Contact type ty pe "b" to each other. Answer 3: Relay to break Contact type "a" from each other. Answer 4: Relay to break Contact type "b" from each other. betwe en. Instantaneous Relay with Inverse Time Relay Article: 53 It does not differentiate between. Answer 1: Instantaneous Relay structure Hinged Arm ature but the Inverse Time Relay is Induction Type. Answer 2: Instantaneous Relay Armature Attractive structure, but of an Inverse Time Re lay Induction Disc. Answer 3: Instantaneous Relay is active once the current flowing through the Coil Fault e xceeds the value set, but Inverse Time Relay will be proportional to the amount of running time. Current Answer 4: Instantaneous Relay create easier Inverse Time Relay. Article: 54 The following text Which is corre ct A. Solid State Relay is a relay that has no moving parts B.

Solid State Relay is a relay that does not require external power from C. Microprocessor Relay is a relay that can perform many functions in one. D.Microprocessor Relay is a relay circuit within a complex structure.

Answer 1: The A and C. Answer 2: A and D. Answer 3: A, B and C. Answer 4: The B and D. D. Article: 55 Standard IEC 60617 (IEC Relay Symbols) of the relay shown. Means any relay

Answer 1: Instantaneous Overcurrent Relay. Answer 2: Differential Relay Answer 3: Definite Time Earth Fault Over current Relay. Answer 4: Directional Overcurrent Relay. Article: 56 Standard IEC 60617 (IEC Relay Symbols) of the relay shown. Means any relay

Answer 1: Distance Relay Answer 2: Underspeed Relay Answer 3: Underpower Relay Answer 4: Phase Angle Relay. Article: 57 Standard IEC 60617 (IEC Relay Symbols) of the relay shown. Means any relay

Answer 1: Overspeed Relay Answer 2: Power Factor Relay. Answer 3: Overtemperature Relay Answer 4: Phase Angle Relay. Article: 58 Standard IEC 60617 (IEC Relay Symbols) of the relay shown. Means any device

Answer 1: Directional Relay Answer 2: Switch Answer 3: Circuit Breaker Answer 4: Thermal Relay Article: 59 Standard IEC 60617 (IEC Relay Symbols) of the relay shown. Means any relay

Answer 1: Phase Angle Relay. Answer 2: Directional Overpower Relay. Answer 3: Power Factor Relay. Answer 4: Revers-Phase Relay. Article: 60 Standard IEC 60617 (IEC Relay Symbols) of the relay shown. Means any relay

Answer 1: Overspeed Relay Answer 2: Underspeed Relay Answer 3: Overfrequency Relay Answer 4: Phase Angle Relay. Article: 61 Standard IEC 60617 (IEC Relay Symbols) of the relay shown. Means any relay

Answer 1: Underspeed relay Answer 2: Underfrequency relay Answer 3: Underpower relay Answer 4: Undervoltage relay

Article: 62 Standard IEC 60617 (IEC Relay Symbols) of the relay shown. Means any relay

Answer 1: Directional Overcurrent Relay. Answer 2: Definite Time Overcurrent Relay. Answer 3: Negative Sequence Relay. Answer 4: Inverse Time Overcurrent Relay. Article: 63 Relay the following values Impedance Pick up the volume so that the relay.

Answer 1: Relay Number 67. Answer 2: Relay Number 87. Answer 3: Relay Number 27. Answer 4: Relay Number 21. Article: 64 Relay the following Residents urged to flow from CT alone amount to Pick up the relay.

Answer 1: Relay Number 50. Answer 2: Relay Number 67. Answer 3: Relay Number 27. Answer 4: Relay Number 21. Article: 65 Digital Relays mechanism works depends on what is important.

Answer 1: Based on the data signal received from the ADC. Answer 2: Based on a statement from the Software. Answer 3: Based on memory. Answer 4: Based on the input and output. Article: 66 Relay following a qualifying Adjustable Logic Elements.

Answer 1: relay relying on elec tromagnetic induction. Answer 2: relays electromagnetic suction housing. Answer 3: Plunger Relays

Answer 4: Static Relays Article: 67 Over Load Relay capacity metal c ounterpart (Bimetal) How does it work.

Answer 1: The use of different types of metal. When the heat at the same rate of e xpansion as well. Answer 2: Use the vacuum vac uum magnetic contactor page. By plaque Answer 3: The use of different types of metal. When the heat at the same rate of contraction as well. Answer 4: Use the m agnetic induction plaque to open - close contact. Article: 68 The Pilot Relaying popular protective device in the power system.

Answer 1: Use anti-generator. Answer 2: protective transformer. Answer 3: Use power line protection. Answer 4: To prevent electric motors. t he relay Microprocessor or Digital Relays in use today require Article: 69 Within the structure of the Multiplexer (MUX) to do nothing. Answer 1: Use a noise filter device before the ADC. Answer 2: Select and sort of signal to the device before the ADC. Answer 3: Use the device to maximize the signal before ADC. Answer 4: Use a c lock signal within the relay. Article: 70 Relay the following Compatible with devices to measure both CT and VT.

Answer 1: Relay Relay Number 50 and Number 51. Answer 2: Relay Relay Number 25 and Number 67N. Answer 3: Relay Relay Number 32 and Number 21. Answer 4: Relay Relay Number 51 and Number 27. Article: 71 Incomplete Sequence Relay (48) used to protect equipment in the power system.

Answer 1: Use anti-generator. Answer 2: protective transformer. Answer 3: Use power line protection.

Answer 4: To prevent electric motors. Article: 72 The following text Which was to A) 59-Overvoltage Relay and 27-Undervoltage Relay

protective voltage in the power system disorders B) 25-Synchronism Relay. The monitoring frequency And phase of voltage in the circuit to make two parallel C) 59-Overvoltage Relay and 81-Undervoltage Relay protective frequency electric al fault. Usually D) 21-Distance Relay and 87-Differential Relay protective devices in electrical transformers. Answer 1: The A and B. Answer 2: The A and C. Answer 3: A, B and C. Answer 4: The C and D. Article: 73 Code and the device name in any of the following. All right

Answer 1: 49-Frequency Relay, 50-Instantaneous Overcurrent Relay, 67-Undervoltage Relay. Answer 2: 21-Distance Relay, 50-I nstantaneous Overcurrent Relay, 51-Time Overcurrent Relay. Answer 3: 40-Loss of Excitation Relay, 59-Overvoltage Relay, 78-Differential Relay. Answer 4: 50-Time Overcurrent Re lay, 51-Instantaneous Overcurrent Relay, 87-Differential Relay. Article: 74 Code and the device name in any of the following. All right

Answer 1: 27-Overvoltage Relay, 51-Time Overcur rent Relay, 59-Undervoltage Relay. Answer 2: 27-Overvoltage Relay, 51-Undervoltage Relay, 59-Time Overcurrent Relay. Answer 3: 27-Undervoltage Relay, 51-Time Overcurrent Relay, 59-Overvoltage Relay. Answer 4: 27-Undervoltage Relay, 51-Overvoltage Relay, 59-Time Overcurrent Relay. Article: 75 Code and the device name in any of the following incorrect.

Answer 1: 21-Distance Relay, 40-Loss o f Excitation Relay, 59-Overvoltage Relay. Answer 2: 32-Power Direction Relay, 60V-Voltage Balance Relay, 87-Differential Relay. Answer 3: 27-Undervoltage Relay, 37-Undercurrent Relay, 78-Out of Step relay. Answer 4: 49-Frequency Relay, 50-Instantaneous Overcurrent Relay, 51-Time Overcurrent Relay. Article: 76 Relay the following Residents urged to sign the VT alone. The relay

Answer 1: Relay Relay Number 50 and Number 87. Answer 2: Relay Relay Number 51 and Number 67. Answer 3: Relay Relay Number 25 and Number 27. Answer 4: Relay Relay Number 81 and Number 21. Article: 77 Relay the following Compatible with CT alone.

Answer 1: Relay Relay Number 50 and Number 87. Answer 2: Relay Relay Number 21 and Number 67N. Answer 3: Relay Relay Number 25 and Number 27. Answer 4: Relay Relay Number 51 and Number 59. Article: 78 The detection of the harmonic ser ies with the relay function Harmonics Restraint to no avail.

Answer 1: Use anti-ordered trips o f the relay when Faults occur outside o utside the protection zone. Answer 2: Use protective order trips under Abnormal Conditions of the relay, but not the Faults within the protection zone. Answer 3: protective relay trips in order to prevent another area of o f overlapping (Overlap) to relay in the protection zone before work. Answer 4: Take a Trip Circuit Breaker Relays detected on the harmonic series exceeds a preset value. Article: 79 Standard IEC 60617 (IEC Relay Symbols) of the relay shown. Means any relay

Answer 1: Phase Angle Relay. Answer 2: Voltage Restrained / Controlled Overcurrent Relay. Answer 3: Revers-Phase Relay. Answer 4: Directional Overcurrent Relay. Article: 80 ANSI Standard 25 compliant device ID refers to any device.

Answer 1: Thermally Operated Circuit Breaker. Answer 2: Relay Operated Circuit Breaker.

Answer 3: Synchronizing or Synchronism-Check Device. Answer 4: Over Voltage Relay. Article: 81 Which of the following principles overcurrent protection is wro ng.

Answer 1: Relay overcurrent relays re lays are the most used in the prevention and Phase Faults Earth Faults. Answer 2: The Fault detection occurs in the current system may be used, or the current time and time together. Answer 3: Fault detection in volume occurring in the system may be used as current, voltage, or any time. Answer 4: short circuit protection (Short Circuit) to be set up to relay Fault near the work first. Article: 82 Grading Margin for the most appropriate. For relays should be in any range.

Answer 1: 0.1 to 1.0 seconds. Answer 2: 0.25 to 0.4 seconds. Answer 3: 1.0 - 3 .0 seconds. Answer 4: 2.0 - 5 .0 seconds. Article: 83 The Discrimination Relay system overcurrent protection. What can be done in many ways

Answer 1: The second method is to use the current time. Answer 2: The second method is using c urrent and phase angle. Answer 3: The third way is using the stream, and the stream with the t he time. Answer 4: 3 ways to use current, phase angle and time. Article: 84 Characteristics of overcurrent relays a Definite Time Overcurrent Relay is any.

Answer 1: Relay to work. Once detected, the Fault current value exceeds the current set up. The fastest time was almost immediate. Answer 2: Relay to work. Once detected, the Fault current value exceeds the current set up. The time fixed by the design. Answer 3: The relay is working. Once detected, the Fault current value exceeds the current set up. The running time is inversely proportional to the amount of fault curr ents. Answer 4: Relay run. Once detected, the Fault current value exceeds the current set up. The running time is proportional to the amount of fault currents.

Article: 85 Characteristics of an overcurrent relays Definite Current Overcurrent Relay is any.

Answer 1: Relay to work. Once detected, the Fault that is equal to or greater than the current set up. The running time is inversely proportional to the amount of fault c urrents. Answer 2: Relay to work. Once detected, the Fault that is equal to or greater than the current set up. The running time is proportional to the amount of fault currents. Answer 3: The relay is working. Once detected, the Fault that is equal to or greater than the current set up. The relay will not work immediately, depending on the currents. Answer 4: Relay run. Once detected, the Fault that is equal to or greater than the current set up. The relay run will be delayed by the constant adjustment of the set. Article: 86 The characteristics of the relay overcurrent Inverse Time Overcurrent Relay is any.

Answer 1: Relay to work. When it detects that the impedance measurement is less than the adjusted set. The relay will start work immediately. And even faster if it Impedance is less. Answer 2: Relay to work. Once detected, the Fault current value exceeds the current set up. The relay will start work immediately. And even faster if the flow is less. Answer 3: The relay is working. Once detected, the Fault current value exceeds the current set up. The running time is proportional to the amount of fault currents. Answer 4: Relay run. Once detected, the Fault current value exceeds the current set up. The running time is inversely proportional to the amount of fault curre nts. Article: 87 Overcurrent relays with no direction (Non-directional Overcurrent Re lay) Use in Detecting

Faults. Answer 1: level measurement. Answer 2: Comparison of phase angle. Answer 3: Comparison of different flows. Answer 4: Detecting Harmonic Knicks. Article: 88 Grading Margin based on the following factors.

Answer 1: Overshoot time of the t he relay. Answer 2: the crash of the device. Answer 3: Time to break the cycle of Circuit Breaker. Answer 4: All of the above.

Article: 89 Which is not a major factor in determining the time Grading Margin for grading work time

overcurrent relays. Answer 1: Time to break the cycle of Circuit Breaker. Answer 2: excessive running time (Overshoot Time) of the relay. Answer 3: The time allowance (Allowance) for e rrors. Answer 4: fixed period of short circuit. Article: 90 The definition of "overcurrent (Overcurrent)" to protect the power system have a look what.

Answer 1: There are two ways to Short Circuits Inrush Current. Answer 2: There are two ways to Short Circuits Interrupting Current. Answer 3: There are two ways to Short Circuits Over Load. Answer 4: There are three types of Short Circuits, Over Load and Transient. Article: 91 The symbol of "Instantaneous Overcurrent Relay" by IEC (I EC Symbols) is any.

Article: 92 The symbol of "Inverse Time Overcurrent Relay" by IEC (IEC Symbols) is any.

Article: 93 The symbol of "Inverse Time Earth Fault Overc urrent Relay" by IEC (IEC Symbols) is any.

` Article: 94 The symbol of "Phase-Directional Overcurrent Relay" by the I EC (IEC Symbols) is any.

Article: 95 The symbol of the "Ground-Directional Overcurrent Relay" by t he IEC (IEC Symbols) is any.

re lay overcurrent protection. By Article: 96 Electrical short circuit current of a maximum of 8,000 A relay commuting flows through the transformer (CT) with a flow rate of 500/5 A test to calculate. For the Plug Setting Multiplier (PSM) will be how much. When adjusting the flow at 150%. Answer 1: 6.0 Answer 2: 8.76 Answer 3: 9.56 Answer 4: 10.67 Article: 97 The working conditions of Directional Overcurrent Relay is any.

Answer 1: When the r elay flow visibility. Greater than or equal to the curre nt setting. The relay run Answer 2: When the r elay flow visibility. Greater than or equal to the curre nt setting. The right direction The relay run Answer 3: When the r elay flow visibility. Greater than or equal to the c urrent setting. And the opposite direction The relay run Answer 4: When the r elay flow visibility. Less than or equal to the current sett ing. The right direction The relay run Article: 98 Phase Directional Overcurrent Relay and Ground Directional Overcurrent Relay compliant

IEEE C37.2 (ANSI Device Numbers) means any number of relays. order Answer 1: 67 and 67N. Answer 2: 51 and 51N. Answer 3: 50 and 50N. Answer 4: 32 and 32N. Article: 99 Phase Directional Overcurrent Relay Electromechanical Form Able to use any of them.

Answer 1: 30 degree Connection.

Answer 2: 60 degree Connection. Answer 3: 90 degree Connection. Answer 4: All of the above. Article: 100 Directional Overcurrent Relay can use any of a Polarizing Quantity does.

Answer 1: Voltage. Answer 2: electricity. Answer 3: use either voltage or current of the defense case. Answer 4: Use the power frequency. Article: 101 Directional Overcurrent Relay amount of any Operating Quantity.

Answer 1: Voltage. Answer 2: electricity. Answer 3: Both the voltage and current of the defense case. Answer 4: Use the power frequency. Article: 102 Phase Directional Overcurrent Relay (67) for the prevention of any Phase Faults requires a

Polarizing Quantity. Answer 1: voltage only. Answer 2: Use electricity only. Answer 3: Both the voltage and current of the defense case. Answer 4: Use the e lectrical frequency only. Frequency power only. Article: 103 Polarizing Quantity of overcurrent relays to a direct ion (Directional Overcurrent Relays)

means either. Answer 1: The reference volume for the size and orientation of the overcurrent. The relay Answer 2: For a quantitative comparison of the m agnitude of the overcurrent. The relay Answer 3: A reference for comparing the amount of overcurrent. The relay Answer 4: The volume flow compared with the current setting as a percentage. The relay Article: 104 Overcurrent Relay through the curre nt transformer ratio (CT) with 800/5 A C urrent Ratio is

set to run at 80% of the start of the Relay is how much.

Answer 1: 5 A Answer 2: 4 A Answer 3: 3 A Answer 4: 2.5 A Article: 105 Overcurrent Relay through the current transformer ratio (CT) has a Current Ratio 1000/1 A

is set to run at 125%, the start of the Relay is how much. Answer 1: 2.0 A Answer 2: 1.5 A Answer 3: 1.25 A Answer 4: 1.0 A Article: 106 Overcurrent Relay through the current transformer ratio (CT) has a Current Ratio 1000/5 A

is set to run at 100% if the current size of 10,000 A Fault Find the PSM would be. how much Answer 1: PSM = 5. Answer 2: PSM = 10. Answer 3: PSM = 15. Answer 4: PSM = 20. Article: 107 In a three-phase 3-wire power system protection with Earth Fault Protection "Residual

Connected" will be used to carry current transformer (CT) How many characters. Answer 1: using CT alone. Answer 2: The use of CT 2. Answer 3: CT use all three options. Answer 4: CT use all four options. Article: 108 Protection Earth Fault Protection of three -phase generator is grounded with Ground Return

must carry current transformer (CT) How many characters. Answer 1: All four of the CT. Answer 2: CT use all three options.

Answer 3: The use of CT 2. Answer 4: using CT alone. Article: 109 Overcurrent protection relays requires a High Setting Instantaneous Overcurrent Device

Number one. Answer 1: 50 Answer 2: 51 Answer 3: 32 The Council reserves the right to ban sales engineer. 27 of 156 Answer 4: 67 Article: 110 The current configuration of Overcurrent Relay m ust be adapted to the existing 7 Tap Plug

Setting, which is 50%, 75%, 100%, 125%, 150%, 175%, 200%, when the Relay is connected to the CT. The rate reduction if the current 1000/5 A setting of 150% is equal to the Plug Setting the few amperes. Answer 1: 5.0 A Answer 2: 6.25 A Answer 3: 7.5 A Answer 4: 8.75 A Article: 111 Relay fault grounded Dual Polarizing Earth-Fault Relay is not intended to solve any

problems. Answer 1: residual voltage (Residual Voltage) is too low. Answer 2: Phase Shift angle too. Answer 3: The Residual Current flow is too low. Answer 4: The Residual Voltage and Residual Current too low. Article: 112 Which of the following devices There is a need protection Directional Overcurrent Relay.

Answer 1: Induction Motor Answer 2: Ring Main Answer 3: Parallel Source without Transformer.

Answer 4: Parallel Source with Transformer. Article: 113 Plug Setting Multiplier (PSM) any means.

Answer 1: Reduce the multiplier m ultiplier for configuration of overcurrent relays. The relay run faster Answer 2: The current in the circuit to prevent a multiple of the current fires. Answer 3: The voltage setting that is a multiple of the voltage of VT to work overcurrent re lays. Answer 4: If the m ultiplier for configuration of overcurrent relays. Safety in the workplace Article: 114 Time Multiplier Setting (TMS) any means.

Answer 1: The multiplier for reducing co nfiguration time of overcurrent relays. The relay run faster Answer 2: If the m ultiplier for setting the running time of overcurrent re lays. Safety in the workplace Answer 3: multiplier function of time overcurrent re lays. For the time actually worked on the PSM of the relay is configured. Answer 4: Set the time for the running time of overcurrent relays. To work together Article: 115 Grading Margin means any

Answer 1: The multiplier for reducing co nfiguration time of overcurrent relays. The relay run faster Answer 2: If the m ultiplier for setting the running time of overcurrent re lays. Safety in the workplace Answer 3: multiplier function of time overcurrent re lays. For the time actually worked o n the PSM of the relay is configured. Answer 4: The value of working time, minimum time for grading the performance of primary overcurrent relays. Reserve with overcurrent relays Article: 116 Overcurrent Relay through the current transformer ratio (CT) has a Current Ratio 1000/5 A

is set to run at 125% if the current size of 15,000 A Fault Find the PSM would be. how much Answer 1: PSM = 20. Answer 2: PSM = 15. Answer 3: PSM = 12. Answer 4: PSM = 10. Article: 117 If any of the following active Overcurrent Relay prevent it.

Answer 1: To prevent overload conditions in induction motors. Answer 2: Locked Rotor protection c onditions in induction motors. Answer 3: Preventing overheating in Stator windings of the electric motor. Answer 4: Preventing excess flux in the transformer. Article: 118 Any mention of the active fault Overcurrent Re lay.

Answer 1: Overcurrent Relay for short circuit protection only. Answer 2: Overcurrent Relay prevent the short circuit and overload conditions in the electrical equipment. Answer 3: Overcurrent Relay features of prevention is better than Fuse (F use). Answer 4: Overcurrent Relay can be used to prevent current leakage to ground in electrical equipment. Article: 119 The amount of the following Can be used as a Polarizing Quantity of Directional Overcurrent

Relay. Answer 1: Real Power Answer 2: Voltage Answer 3: Frequency Answer 4: Power Factor Article: 120 Which is not the working conditions of Directional Overcurrent Relay.

Answer 1: When the flow over the Pick up. Answer 2: When the direction of the current set up by the Relay. Answer 3: When the Power Factor angle exceeds a certain value. Answer 4: All of the above. Article: 121 Phase Directional Overcurrent Relay to 90 ° Connection - 45 degrees when the MTA relay

phase A of the relay this. The relay will give Correct Directional Tripping Zone A when the current phase angle at any range. Answer 1: Leading from 45 degrees to 90 degrees Lagging. Answer 2: Leading from 45 degrees to 135 degrees Lagging. Answer 3: from 45 degrees to 135 degrees Lagging Leading.

Answer 4: from 0 degrees to 180 degrees Lagging. Article: 122 The Discrimination Overcurrent protection system means either.

Answer 1: To set the relays in the system are many. A separate working group To relay the same kind of work together. Answer 2: This is the defense. The r elay near source before. Relays and beyond to serve as a Backup. Answer 3: To set the relays in the system are many. The c oordination To relay the supply is far from most previous work. And the relay is positioned close to supply. A subsequent term upheld assumes without setting time difference (Gr ading Margin). Answer 4: This is the defense. The m ain relay (Primary Relay) near the point where the short circuit occurred before. And Auxiliary relay (Back Up Relay) that precious away point. The work time (Grading Margin) long enough to e nsure that the relay back to secure (Secure). Article: 123 Very Inverse Overcurrent Relay Series has set the Time Multiplier Setting (TMS) = 0.3, CT

Ratio = 1000/1 A by adjusting the flow at 100% if the current Fault. 10,000 A Calculate how much time the relay. Answer 1: 0.24 seconds Answer 2: 0.45 seconds Answer 3: 0.90 seconds Answer 4: 4.00 seconds Article: 124 Overcurrent relays are working Curve Standard Inverse (SI) [IEC 60255], setting it at 0.5

using TMS 800/5 A CT Ratio coordinate and optimize the flow at 100%. The current fault is equal to 5,000 A relay with a time of much work. Answer 1: 0.500 seconds Answer 2: 1.875 seconds Answer 3: 0.945 seconds Answer 4: 3.750 seconds Article: 125 Overcurrent relays are working Curve Very Inverse (VI) [IEC 60255], setting it at 0.6 using

TMS 600/5 A CT R atio coordinate and optimize the flow at 100% when. The fault is equal to 4,000 A relay with a time of much work. w ork.

Answer 1: 1.429 seconds Answer 2: 2.025 seconds Answer 3: 2.382 seconds Answer 4: 3.375 seconds Article: 126 Overcurrent relays are working Curve Standard Inverse (SI) [IEC 60255] used CT Ratio 800/5

A by setting the coordinates to 100% when the fault current is equal. 4,000 A To relay re lay at 1.5 seconds to adjust how much t he TMS. Answer 1: TMS = 0.3. Answer 2: TMS = 0.2. Answer 3: TMS = 0.25. Answer 4: TMS = 0.35. Article: 127 Overcurrent relays are working Curve Extremely Inverse (EI) [IEC 60255] used CT Ratio

coordinates 800/5 A by setting flow at 125% when the fault currents are equal. If you want the relay to 5,000 A at 2.0 seconds to adjust how much the TMS. Answer 1: TMS = 3.33. Answer 2: TMS = 0.60. Answer 3: TMS = 1.19. Answer 4: TMS = 0.95. Article: 128 Extremely Inverse Overcurrent Relay Series has set the Time Multiplier Setting (TMS) = 0.2,

CT Ratio = 1000/5 A, Pick Up Value = 4 A, if the stream. Fault = 8,000 A Calc ulate how much time the relay. Answer 1: 0.12 seconds Answer 2: 0.16 seconds Answer 3: 0.25 seconds Answer 4: 0.33 seconds Article: 129 Any characterization of overcurrent relays. The popular current use

Answer 1: Definite Time Overcurrent Characteristics.

Answer 2: Definite Current Overcurrent Characteristics. Answer 3: Inverse Time Overcurrent Characteristics. Answer 4: Inverse Definite Minimum Time Overcurrent Character istics. Article: 130 Phase Directional Overcurrent Relay on a 60 degree Connection considering the amount of

any Operating relay phase A and the amount of any Polarizing respectively. Answer 1: Phase A is current c urrent Operating voltage between phase and B -C is Polarizing. Answer 2: Operating current Phase A is the vector sum of the voltage and phase B-C and A-C phase is Polarizing. Answer 3: A phase current and voltage during the Operating Phase A-B is Polarizing. Answer 4: Operating current phase A and a vector sum of the voltage between phase A-B to Phase A-C is Polarizing. Article: 131 Phase Directional Overcurrent Relay on a 90 degree Connection considering the amount of

any Operating relay phase A and the amount of any Polarizing respectively. Answer 1: Phase A is current c urrent Operating voltage between phase and B -C is Polarizing. Answer 2: Operating current Phase A is the vector sum of the voltage and phase B-C and A-C phase is Polarizing. Answer 3: A phase current and voltage during the Operating Phase A-B is Polarizing. Answer 4: Operating current phase A and a vector sum of the voltage between phase A-B to Phase A-C is Polarizing. Article: 132 Phase Directional Overcurrent Relay Electromechanical type on a 90 degree Connection - 45

degree MTA angle between the t he Operating Quantity Polarizing. Quantity causing maximum torque value is how much. Answer 1: The maximum torque occurs at an angle of 30 degrees. Answer 2: The maximum torque occurs at an angle of 90 degrees. Answer 3: The maximum torque occurs at an angle of 45 degrees. Answer 4: maximum torque occurs at an angle of 60 degrees. Article: 133 Standard Inverse Overcurrent Relay via a current transformer (CT) has a Current Ratio

1000/5 A, TMS = 0.2 set to 100% if the current size Fault. 5,000 A relay with a time of much work.

Answer 1: 0.43 seconds Answer 2: 4.30 seconds Answer 3: 0.80 seconds Answer 4: 0.86 seconds Article: 134 Standard Inverse Overcurrent Relay via a current transformer (CT) has a Current Ratio

1000/1 A, TMS = 0.1 set to 125% if the current size Fault. 5,000 A relay with a time of much work. Answer 1: 0.1 seconds Answer 2: 5.0 seconds Answer 3: 0.5 seconds Answer 4: 0.43 seconds Article: 135 Protection Earth Fault Protection in three -phase power system with Residual Connected

must carry a current transformer (CT) one. Answer 1: CT connector Wye. Answer 2: CT connected in Delta. Answer 3: CT connector Open Delta. De lta. Answer 4: None of the above. Article: 136 Phase Directional Overcurrent Relay Electromechanical type on a 90 degree Connection - 30

degree MTA to the maximum torque at the Power Factor is how much. Answer 1: 0 degrees Answer 2: 30 ° Answer 3: 45 degrees Answer 4: 60 degrees Article: 137 Standard Inverse Overcurrent Relay for use with CT Ratio = 1000/5 A, Pick Up Value = 5 A,

TMS = 0.1 when Fault 15 times the current settings to the relay. How much work time Answer 1: 0.1 seconds

Answer 2: 2.5 seconds Answer 3: 0.25 seconds Answer 4: 1.5 seconds Article: 138 Overcurrent Relay with Curve Working Long Time Inverse (LTI) according to the IEC 60255

standard PSM = 5 and TMS = 1 relay with a time of 30 seconds seco nds to run. The relay with a time of 3.0 seconds, the PMS must use the TMS is much the same. Answer 1: 10.0 Answer 2: 0.1 Answer 3: 0.2 Answer 4: 0.01 Article: 139 Phase Directional Overcurrent Relay Electromechanical type on a 90 degree Connection - 45

degree MTA to the maximum torque at the Power Factor is how much. Answer 1: PF = 1.0. Answer 2: PF = 0.5 lagging. Answer 3: PF = 0.707 lagging. Answer 4: PF = 0.866 lagging. Article: 140 Ground Directional Overcurrent Relay for Voltage Polarization on the S ingle Line to Ground

Faults Polarizing voltage is approximately how much. Answer 1: Equal-pressure phase of the system. Answer 2: voltage equal to zero sequence voltage phase of the short circ uit to ground. Answer 3: about three times the current number of zero-phase zero -phase short circuit caused the grounding. Answer 4: about 3 times the t he voltage of the zero-phase sequence c aused a short circuit to ground. Article: 141 Residual Current guidance is used to detect Polarizing Signal Ground Faults with directions

to do. Answer 1: The signal flow from CT c onnected Neutral point of a Polarizing Signal. Answer 2: The signal flow of the three-phase helical CT Secondary side parallel to a Polarizing Signal. Answer 3: The signal pressure from VT to a Y through a resistance Polarizing Signal.

Answer 4: The current signal, which has a window of CT looped through the three -phase wiring is Polarizing Signal. Article: 142 Radial distribution model shown below. The relays are both working Curve Standard Inverse

(SI) [IEC 60255] Whe n Discrimination. The relay Bus A And using a Bus B Grading Margin = 0.35 seconds and adjust the settings as indicated. To calculate the time to work on the F ault relay at Bus B Fig.

Answer 1: The time re relay lay function Bus B = 0.35 seconds. Answer 2: The time re relay lay function Bus B = 0.5 seconds. Answer 3: The time re relay lay function Bus B = 2.97 seconds. Answer 4: Time running relay Bus B = 3.32 seconds. Article: 143 Distribution system design Radial System Figure assigned to both relays are working Curve

Extremely Inverse (EI) [IEC 60255] is set on the relay, as indicated in Fig. Discrimination The relay Bus A and Bus B re lays using Grading Margin = 0.35 seconds to set the TMS Relay Bus B by how much.

Answer 1: Relay Bus B at the TMS = 0.06. Answer 2: Relay Bus B at the TMS = 0.433. Answer 3: Relay Bus B at the TMS = 0.35. Answer 4: Relay Bus B at the TMS = 0.19. Article: 144 Distribution system design Radial System Figure assigned to both relays are working Curve

Extremely Inverse (EI) [IEC 60255] If the relay is set to Bus B Back up. Bus A relay of protection using the most time working (Grading Margin) 0.35 seconds when Fault within the Primary Zone (F2) of relay at Bus B asked himself. Bus B relay that will work, how much time.

Answer 1: 0.433 seconds Answer 2: 0.350 seconds Answer 3: 0.137 seconds Answer 4: 0.260 seconds Article: 145 Phase Directional Overcurrent Relay Electromechanical type on a 90 degree Connection - 30

degree MTA if the Power Factor (PF) of the system is 1.0 features. The overcurrent relays this to the t he Operating Torque is how many times the Maximum Torque (Tmax). Answer 1: 0.5 Tmax Answer 2: 0.707 Tmax Answer 3: 0.866 Tmax

Answer 4: 0.95 Tmax Article: 146 Distribution system design Radial System relays both have shown the Curve function

Standard Inverse (SI) standard IEC 60255 Bus B If the relay is set to do. Back up protection is used to relay the Bus A Margin Time = 0.35 seconds will be asked to set the TMS Relay Bus B by how much.

Answer 1: TMS relay at Bus B = 0.176. Answer 2: TMS relay at Bus B = 0.078. Answer 3: TMS relay at Bus B = 0.095. Answer 4: TMS relay at Bus B = 0.35. Article: 147 Radial distribution model shown below. The relays are both working Curve Standard Inverse

(SI) [IEC 60255] Whe n Discrimination. The relay Bus A And using a Bus B Grading Margin = 0.4 seconds and adjust the settings as indicated in Fig. To calculate the value of TMS relay at Bus B is equal to any.

Answer 1: Relay Bus B at the TMS = 0.1.

Answer 2: Relay Bus B at the TMS = 0.45. Answer 3: Relay Bus B at the TMS = 0.13. Answer 4: Relay Bus B at the TMS = 0.4. Ear th Fault Protection Relays Overcurrent Relay will take any Device Article: 148 If you want to do with Earth Number. Answer 1: 50, 51. Answer 2: 50N, 51N. Answer 3: 67 Answer 4: 87 Article: 149 Overcurrent relays are working Curve Extremely Inverse (EI) [IEC 60255], set the TMS 0.5, if

the CT Ratio coordinates 1200/5 A and adjust the flow to 100%. When the fault is equal to 7, 000 A relay with a time of much work. Answer 1: 0.094 seconds Answer 2: 2.422 seconds Answer 3: 1.667 seconds Answer 4: 1.211 seconds Article: 150 Ground Directional Overcurrent Relay can be used in any quantity as "Polarizing Signal" to

give some direction to the relay. Answer 1: Phase Current use only. Answer 2: Residual Current use only. Answer 3: The Residual Voltage alone. Answer 4: Yes, and the Residual Re sidual Current Residual Voltage.