Pipe

 

Polytechnic University of the Philippines – Alfonso Campus  MEEN 4096 (ME Elective 4) Power and Industrial Plant Engineering Feb. 28, 2019 SET A Directions: Select the correct answer for each of the following questions.  Mark only one answer    for each item by marking the box  for corresponding to the letter of your choice on the answer sheet  provided. Indicate the SET   of your questionnaire by shading it in  of your answer sheet. Strictly No Erasures Allowed  . Use pencil in shading.

1. The relation between the Fahrenheit absolute scale and the Celsius absolute scale is: a. Deg R = 18 deg K b. Deg R = 32 deg K c. Deg R = 3.2 deg K d. Deg R = 1.8 deg K 2. Air is compressed adiabatically from an initial pressure of 200 20 0 psi and a temperature of 700 deg R to 300 psi. Find the temperature after the compression. a. 576 deg C b. 680 deg C c. 590 deg C d. 786 deg C 3. Nitrogen is expanded isentropically. Its temperature changes from 620 to 60 deg. F. Find the pressure ratio, initial over final pressure. a. 0.08 b. 26.2 c. 12.09 d. 3547 4. Determine the of water when a. 20,117.5 b. 45,711.5 c. 30,117.5 d. 60,711.5

amount of heat energy rejected by 0.5 cubic meters meter s it is cooled from 35 degree C to 6 degree C. kJ kJ kJ kJ

  5. A acting reciprocating diameter of 18 cm andsingle a stroke of 30 cm, deliverspump, waterwith at aa rate of 0.18 cubic meter per second. What is the percentage slip it delivers at 1500 rpm? a. 1.6% b. 5.3% c. 8.4% d. 10.5% 6. In an ideal Otto cycle, the initial pressure pressu re and temperature of air are 100 kPa and 18 degree C. Determine the maximum pressure in the cycle if the maximum temperature in the cycle is 600 degree C, and the compression ratio is 8. a. 1890 kPa b. 2240 kPa Page 1 of 14 

 

c. 1500 kPa d. 2400 kPa 7. A 20cm x 36cm, twin cylinder, two stroke cycle diesel engine running at 650 rpm. The engine rate is 112 kW. Determine the engine displacement in cubic meter/sec per brake horsepower. a. 0.0163 b. 0.00163 c. 0.163 d. 0.0631 8. Determine the air-standard efficiency of an engine operating on the diesel cycle when the suction pressure is 99.97 kPa and the fuel is injected for 6% of the stroke, the clearance volume is 8% of the stroke. Assume k = 1.4. a. 50% b. 55% c. 60% d. 80% 9. An Otto engine has a clearance volume of 7%. It produces 300 kW power. What is the heat rejected in kW? a. 170 b. 152 c. 160 d. 145 10.  Two pumps are connected in series, if Q1 is the discharge of Pump 1 and Q2 is the discharge of Pumps 2 where Q 2