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PAPER: BHEL PLACEMENT PAPER-2006 1.Consider the following expressions indicating the step or impulse response of an initially relaxed control system1. (5 – 4e-2+) u(t) 2. (e-2t +5) (u(t)) 3 .V(t) + 8e-2t u(t) 4 . V(t) + 4e-2t 4(t)

2.Which is the following relate to rational transfer function of a system1. Ratio of Fourier transform of output to input with zero initial conditions. 2. Ratio of Laplace transform of output to input with zero initial conditions. 3. Laplace transform of system impulse response.

3. Laplace transform of system unit step response select the correct answer using the codes given below. Codes a.) 1 and 4 b.) 2 and 3 c.) 1 and 3 d.) 2 and 4 4.For the signal g (t) – 10 cos (50 pt) cos2 (150at) The Nyquist sampling state in t seconds is a.) 150 samples per second b.) 200 samples per second c.) 300 samples per second d.) 350 samples per second

5.In the case of a 70 MHz 1F carries for a transponder band width of 36 MHz; energy must lie between – MHz. a.) 34 and 106 b.) 52. And 88 c.) 106 and 142 d.) 34 and 142

6.Radar used to eliminate clutter in navigational application is – a.) Pulse radar b.) Tracking radar c.) MTI radar d.) Mono pulse radar

7.The 1.55 mm windows is not yet in use with fiber optic systems because – a.) The attenuation is higher than at 0.85 mm b) The attenuation is higher than at 1.3mm c.) Suitable laser devices have not yet been developed d.) It does not lend itself to wavelength multiplexing

8.Pre-emphasis in FM systems involves8.Pre-emphasis a.) Compression of the modulating signal b.) Expansion of the modulating signal c.) Amplification of lower frequency components of the modulating signal. d.) Amplification of higher frequency components of the modulating signal.

9.In a terrestrial microwave system transmission of signals is achieved througha.) reflection from the ionosphere b.) line of sight mode c) reflection from the ground d.) diffraction from the stratosphere. 10.Casse grain feed is used with a parabolic reflector to a.) increase the gain of the system b). increase the bandwidth of the system c.) reduce the size of the main reflector d.) allow the feed to be placed at a convenient point. 11.In most microwave communication link rain drop attenuation is caused due toa.) scattering of microwaves by water drops of specific size. b) scattering of microwaves by a collection of droplets acing as a single body. c.) absorption of microwaves by water and consequent heating of the liquid d.) absorption of the microwaves by water vapor in the atmosphere.

12.When a (75 – j40)W load is connected to a coaxial line of Z0 = 75 W at 6MHz then the load matching on the line can be accomplished by connectinga.) A short – circuited stub at the load b.)An inductance at the load c. )A short circuited stub at a specific distance from the load d.)none of the above 13.As compared to analog multimeters, digital Multimeters's are – a.) less accurate b.) more accurate c.) equally accurate d.) none. 14.When a signal of 10 mV at 75 MHz is to be measured then which of the following instruments can be used – a.) VTVM b.) Cathode ray oscilloscope c.) Moving iron voltmeter d.) Digital multimeter 15.Amplifier of class B has high theoretical efficiency of 78.5 percent becausea.) It is biased almost to saturation b.)Its quiescent current is low c.)It’s output is an exact replica of it’s input d.)It is biased well below cut off 

16.The coupling that produces minimum interference with frequency response isa.) Direct coupling b.)Impedance coupling c.) R C coupling d.)Transformer coupling

17.A superconductor is a – a.) A material showing perfect conductivity and Meissner effect below a critical temperature

b.) A conductor having zero resistance c.) A perfect conductor with highest di-magnetic susceptibility d.) A perfect conductor which becomes resistance when the current density through it exceeds a critical value 18.When an inductor tunes at 200 KHz with 624 pF capacitor and at 600 KHz with 60.4 pF capacitor then the self capacitance of the inductor would be – a) 8.05 pF b) 10.05pF c.) 16.01pF d.) 20.01pF

19.The Q of a radio coil – a.) is independent of frequency b.) increases monotonically as frequency increases c.) decreases monotonically as frequency increases d.) increases upto a certain frequency and then decreases beyond that frequency

20.When a generator of internal impedance and operating at 1GHz feeds a load via a coaxial line of characteristic impedance 50 ohm then the voltage wave ratio on the feed line is – a.) 0.5 b.) 1.5 c.) 2.5 d.) 1.75

21.The coding system typically used in digital telemetry is – a.) PPM (pulse position modulation) b.) PAM (pulse amplitude modulation) c.) PCM (pulse code modulation) d.) PDM (pulse duration modulation)

22.Radiation pyrometers are used for the measurement of temperature in the range of – a.) -2000C to 5000C b.) 00C to 5000C c.) 5000C to 12000C d.) 12000C to 25000C

23.RF amplifier of an A.M. receiver is normally biased in – a.) Class 'A' b.) Class 'b' c.) Class 'C' d.) None

24.The value of gate voltage for the operation of enhancement of only N channel MOSFET has to be – a.) High positive b.) High negative c.) Low positive d.) Zero

General Apptitude: very easy. There are 120 questions . English: Detect the words with wrong spellings (5 questions). Fill in the blanks with appropriate words(5 questions). Two reading comprehensions were given(10 questions). Find the error in the sentence (8 questions). Reasoning: Seating arrangement problems. Find the relation between them. Quantitative ability: 50% of the questions are from basic geometry . Remaining were very general and easy. But many questions are there that's y you should consider time factor and be quick.

(Paper) BHEL Job Interview Placement Paper: Haridwar (2008) They have called people in morning and afternoon shifts, nearly 15-16 people per shift. We were asked to bring interview call-letter, biodata form, TA form, all original mark-sheets and one Xerox copy of all. When we reached the venue, first they verified all documents. SC/ST people have to show original caste certificate. They have a list of central reserved castes and your caste serial no. will be verified with that. The traveling allowance will paid there itself to all. After that we were made to sit and wait for our turns. About Biodata form – They will post it in web site, it has all relevant information about you similar to a resume, (so we do not need any resume there) like your name, address, all semester marks details, 10-12th marks, college, area of interest, main subjects in semesters, your current job profile, have you appeared for any other govt./PSU exams etc. While preparing for interview, everybody told me to stress on technical and final year project and for HR questions, but that proved wrong. My timing was in the afternoon shift at 2 pm, and I was called nearly at 3.30 pm. There were 3 people in the panel. They seem to be very experienced ones. They started with the question – Q. Why I want to join BHEL. Though I was not prepared for this question, as I was expecting technical questions, but I tried answering that I always wanted to join BHEL, I am very adjustable, and I can perform well in the areas in which they will train me. But the people were not much satisfied; they also asked me to give a solid example for my adjustability. Q. They asked about my family, father’s job, brother-sisters etc.. The people seem to be very lenient while asking, infact some-times I felt that they are not taking any interview. We were simply chatting, laughing in the interview room.

Q. Next they asked what preparations I have done for the interview. I told I have checked the BHEL’s site and collected some information about it. Next I have prepared my area of interest i.e. Digital electronics. My 2nd area of interest was Microprocessors 8085 and they started with that. Q. What do mean by 8085. I told it’s the serial no. of the device given by the company Intel. But they were not satisfied and told it must have some meaning. I told may its 8 because it’s a 8-bit processor and about other digits no idea. Q. How many types of microprocessors do we have? I told 8 bit, 16 bit, 32 bit. Q. Do we have any 64 bit processor? I never heard of it so told so. Q. What is RISC/CISC? I answered RISC is reduced instruction set computing and CISC is complex instruction set computing. Q. What’s the difference between them? I told RISC is generally used for high speed switching operations and CISC is for general purpose like 8085. Q. Do we use microprocessors nowadays? I told we generally go for microcontrollers these days. Q. What are microcontrollers? I said it has memory inbuilt in it apart from microprocessor architecture. Q. What do you think the CPU we use has microprocessor in it. I told it has but not only microprocessor. It has other components also. Q. What do you think the other components are? The answer of this question doesn’t click me there so I told no idea. Q. What do think Pentium uses RISC or CISC? I was not sure with this so answered we can use RISC Q. They told don’t tell we can, what we exactly use I told truly that specifically I don’t know. They stopped with this. I felt that they were not very specified with some questions but the best part was I never go nervous and maintained a smile through-out. They have not at all mentioned about final year project or any other curriculum subject. My advice to electronics people is – try having a different area of  interest other than microprocessors because in my batch some 7-8 electronics people came for interview all having same microprocessor as area of interest. The people got little bugged up with and asked some people don’t you have some different subjects.

BHEL PAPER ON 15th SEPTEMBER AT BANGALORE BHEL Interview for Engineer Trainees- 2008 I have attended BHEL off-campus interview for the post of Engineer Trainee-08 conducted on 15th Sep. in Bangalore ….I belong to Electronics

and

communication branch. Well the written test was conducted on 10th Aug. and the results are disclosed soon on 20th Aug. As far as I know BHEL started calling people for interview from 8th Sep. They have set up 3-4 panels, in Bangalore , New Delhi , Kolkata, rest no idea. They have called people in morning and afternoon shifts, nearly 15-16 people per shift. We were asked to bring interview call-letter, biodata form, TA form, all original marksheets and one Xerox copy of all. When we reached the venue, first they verified all documents. SC/ST people have to show original caste certificate. They have a list of  central reserved castes and your caste serial no. will be verified with that. The traveling allowance will paid there itself to all. After that we were made to sit and wait for our  turns. About biodata form –  They will post it in web site, it has all relevant information about you similar to a resume, (so we do not need any resume there) like your name, address, all semester marks details, 10-12th marks, college, area of interest, main subjects in semesters, your current job  profile, have you appeared for any other govt./PSU exams etc. While preparing for interview, everybody told me to stress on technical and final year   project and for HR questions, but that proved wrong. My timing was in the afternoon shift at 2 pm, and I was called nearly at 3.30 pm. There were 3 people in the panel. They seem to be very experienced ones. They started with the question –  Q. Why I want to join BHEL. Though I was not prepared for this question, as I was expecting technical questions, but I tried answering that I always wanted to join BHEL, I am very adjustable, and I can  perform well in the areas in which they will train me. But the people were not much satisfied; they also asked me to give a solid example for my adjustability. Q. They asked about my family, father’s job, brother-sisters etc.. The people seem to be very lenient while asking, infact some-times I felt that they are not taking any interview. We were simply chatting, laughing in the interview room. Q. Next they asked what preparations I have done for the interview. I told I have checked the BHEL’s site and collected some information about it. Next I have prepared my area of interest i.e. Digital electronics. My 2nd area of interest was Microprocessors 8085 and they started with that. Q. What do mean by 8085.

I told it’s the serial no. of the device given by the company Intel. But they were not satisfied and told it must have some meaning. I told may its 8 because it’s a 8-bit  processor and about other digits no idea. Q. How many types of microprocessors do we hav e? I told 8 bit, 16 bit, 32 bit. Q. Do we have any 64 bit processor? I never heard of it so told so. Q. What is RISC/CISC? I answered RISC is reduced instruction set computing a nd CISC is complex instruction set computing. Q. What’s the difference between them? I told RISC is generally used for high speed switching operations and CISC is for general  purpose like 8085. Q. Do we use microprocessors nowadays? I told we generally go for microcontrollers these days. Q. What are microcontrollers? I said it has memory inbuilt in it apart from microprocessor architecture. Q. What do you think the CPU we use has microprocessor in it. I told it has but not only microprocessor. It has other components also. Q. What do you think the other components are? The answer of this question doesn’t click me there so I told no idea. Q. What do think Pentium uses RISC or CISC? I was not sure with this so answered we can use RISC Q. They told don’t tell we can, what we exactly use I told truly that specifically I don’t know. They stopped with this. I felt that they were no t very specified with some questions but the best part was I never go nervous and maintained a smile through-out. They have not at all mentioned about final year project or any other curriculum subject. My advice to electronics people is – try having a different area of interest other than microprocessors  because in my batch some 7-8 electronics people came for interview all having same microprocessor as area of interest. The people got little bugged up with and asked some  people don’t you have some different subjects. The interview will continue till 8 Oct. and results may be out after 15th Oct. Please pray for me, hope I make it, though rare hopes for me…….. Let’s see. All the very best to all other aspirants, Shilpa

BHEL PAPER ON 8th OCTOBER AT HARIDWAR

Dear Friends, I have given the BHEL recruitment exam for the post of Engineer Trainee in Electrical Branch. Though I can not cleared this but i have my exam experience, which i will share with you. The exam contains 240 questions. 120 from Technical Side (60 from Electrical Engg & 60 from General Engg) 120 from Non Technical Side (35 from English, 35 from Aptitude & 50 from Maths) Technical Paper is purly Numerical Based and contains the questions like below: Electrical Engg paper has around 1) 15 Questions from Electrical Machines out of this 10 numericals. 2) 8 Numericals from Control System 3) 4 Numericals from Instrumentation 4) 15 Questions from Electrical Power out of this 8 numericals 5) 8 Questions from Circuit and field theory 6) 10 Questions from Electronics (Power & Digital) General Engg paper has around 1) 35 Questions from mechanical engg 2) 15 Questions from Physics 3) 10 Questions from other general engg

 Non Technical paper is very easy. To solve this paper, speed contains an important factor. We have only 35 seconds to solve a question. So be fast and All the Best RK Goel Hi friends , I am Sai Krishna Taloju , attended for BHEL exam on 11 Nov in Delhi and selected for interview . I want share the pattern of the paper so that it will be useful to all . The paper consists 240 Questions in which 120 technical &120Aptitude &General English with negative marking 1/5mark In Technical the questions are asked on very basics , 30 questions are mechanical related 10 questions are from Power Systems by CL WADHAWA directly , 20 - 25 from Objective question bank by Galgotia publishers All the questions are basically from Power systems , Machines, contrrol systems , some questions are from micro processors, power electronoics. few from measurements In Aptitude the questions are asked very simple

finding errors 10 marks antonyms 10 marks Synonyms 10 marks passages 10 marks 30 marks as follows table consist of X , Y statements make the relation b/n X ,Y such that X=Y, X>Y, X< DIV> THE ONLY THING U HAVE TO REMEMBER IS THAT TIME IS 150Mins TO SOLVE 240 QUESTIONS. Thank you to FRESHERS WORLD to give this oppurtinuities to share this discussion Soonly I will update the pattern of Interview. regards SAI KRISHNA . TALOJU Paper: DRDO Placement Paper Model For ECE ( Technical) Direct Theory question: 1. A triangular-square wave generator uses * A sine wave oscillator and a comparator * An integrator and a comparator * A differentiator and comparator * A sine wave oscillator and a clipper 2. An amplifier has two i dentical cascaded stages. Each stage has a BW of 20KHz. The overall BW shall be * 10KHz * 12.9KHz * 20KHz * 28.3HHz Direct numerical problem: 1. A parabolic dish antenna has a diameter of 1m. the maximum possible ideal gain of the antenna at a wavelength 3.14cm is * 20 dB * 30 dB * 40 dB * 50 dB 2. The frequency deviation produced in a VHF carrier by a signal of 100Hz is 50KHz. The frequency modulation is *100 radians *250 radians *500 radians *750 radians Application based theoretical or numerical problem: 1. Which one of the pulses has the same form in time domain as well as in frequency domain *Rectangular *Exponential *Triangular *Gaussian 2. Good voice reproduction via PCM requires 128 quantization levels. If the BW of voice channel is 4KHz then data rate is *256 Kbps *128 Kbps

*56 Kbps *28 Kbps 3. Match the following: 1. List 1 List2 A. Thyristor 1. Second break down B. MOSFET 2. Large on-state drop C. IGBT 3. Small on state drop D. BJT 4. Slow device Codes: (a) A-4, B-3, C-2, D-1 (b) A-1, B-2, C-3, D-4 (c) A-4, B-2, C-3, D-1 (d) A-1, B-3, C-2, D-4 4. List 1 List2 A. Free and forced response 1. Discrete time systems B. Z transform 2. Dirichlet conditions C. Probability theory 3. Non-homogenous differential equation d. Fourier series 4. Random process Codes: (a) A-1, B-3, C-2, D-4 (b) A-3, B-1, C-2, D-4 (c) A-1, B-3, C-4, D-2 (d) A-3, B-1, C-4, D-2 Assertion and reasoning type: The following item consists of two statements labeled as Assertion A and the other as Reason R. Use the following codes: (a) Both A&R are individually true and R is the correct explanation of A (b) Both A & R are individually true and R is not the correct explanation of A (c) A is true and R is false (d) A is false and R is true 5. Every materials has a different value of energy band gap except metals which have no band gap R The energy band gap is decided by the equilibrium lattice constant, which is different in different materials. 6. AOp-amp are commonly used in instrumentation Op-amps do not load the circuit due to their very high input impedance