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# MCQ in Power Plant Engineering Part 3 | ME Board Exam

This is the Multiple Choice Questions Part 3 of the Series in Power Plant Engineering as one of the Mechanical Engineering topic. In Preparation for the ME Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Mechanical Engineering field, Mechanical Engineering Books, Journals and other ME References. I assume you are looking for a reviewer that will help you achieve your goal to become a License Mechanical Engineer very soon. Yes, you are in the right place to make your dream come true. Make sure to familiarize each and every questions to increase the chance of passing the Mechanical Board Examination.

#### MCQ Topic Outline included in ME Board Exam Syllabi

• MCQ in Power Plant Elements
• MCQ in Power Plant Design
• MCQ in Industrial Plant Engineering
• MCQ in Industrial Plant Design
• MCQ in Refrigeration Engineering and its Applications
• MCQ in Air Conditioning

#### Continue Practice Exam Test Questions Part 3 of the Series

Choose the letter of the best answer in each questions.

101.ย  Aย  rectangularย  foundationย  cross -sectionย  hasย  aย  bedย  plateย  dimensionย  ofย  8ย  ftย  xย  10ย  ft.ย  The uniform clearance on each side is 1 ft. The height of the foundation is 4.5 ft. If the weight of the steelย  barย  reinforcementsย  neededย  isย  ยฝ%ย  ofย  weightย  ofย  foundation,ย  findย  t heย  weightย  ofย  theย  steel bars. Use concrete density of 2400 kg/m3.

A. 173.47 kg

B. 183.47 kg

C. 163.47 kg

D. 153.47 kg

Explanation:

102.ย  Aย  steamย  pipeย  havingย  aย  surfaceย  temperatureย  ofย  250ยฐCย  passesย  throughย  aย  roomย  whereย  the temperatureย  isย  27ยฐC.ย  Theย  outsideย  diameterย  of the pipe isย ย  100 mm and emissivity factor isย ย  0.8. Calculate the radiated heat loss for 3 m pipe length.

A. 1434.47 W

B. 3746.35 W

C. 2851.82 W

D. 3546.45 W

Explanation:

103. Brine enters a circulating brine cooler at the rate of 60 m3/hr atย  -8ยฐC and leaves atย  -18ยฐC. Specificย  heatย  ofย  brineย  isย  1.072ย  kJ/kg -Kย  andย  aย  specificย  gravityย  ofย  1.12.ย  Determineย  theย  tonsย  of refrigeration.

A. 53.5 TR

B. 65.3 TR

C. 33.5 TR

D. 56.9 TR

Explanation:

104.ย  A turbo-charged, 16 cylinder, Vee-type diesel engine has an air consumption of 3,000 kg/hr perย  cylinderย  atย  ratedย  loadย  andย  speed.ย  Thisย  airย  isย  drawnย  inย  throughย  aย  filterย  byย  aย  centrifugal compressor directly connected to the exhaust gas turbine. The temperature of the air from theย compressor is 135ยฐCย  and a counter flow air cooler reduces the air temperature to 45 ยฐC before it goesย  toย  theย  engineย  suctionย  header.ย  Coolingย  waterย  entersย  theย  airย  coolerย  at 30ยฐC and leaves at 40ยฐC. Calculate the log mean temperature difference.

A. 47.23ยฐC

B. 87.82ยฐC

C. 43.34ยฐC

D. 65.24ยฐC

Explanation:

105. Water is flowing in a pipe with radius of 30 cm at a velocity of 5ย ย  m/s at the temperature in the pipe.ย  The density and viscosity of the water are as follows: density = 997.9 kg/s viscosity = 1.131 Pa-s. What is the Reynolds number for this situation?

A. 2647

B. 96.2

C. 3100

D. 1140

Explanation:

106.ย  Computeย  theย  amountย  ofย  condensateย  formedย  duringย  aย  10ย  minuteย  warm-upย  ofย  180ย  meter pipeย  conveysย  theย  saturatedย  steamย  withย  enthalpyย  ofย  vaporization,ย  hfg =ย  1947.8ย  kJ/kg.ย  The minimumย  externalย  temperatureย  ofย  pipeย  isย  2ยฐC.ย  Theย  finalย  temperatureย  ofย  pipeย  isย  195ยฐC.ย  The specific heat of pipe material is 0.6 kJ/kg -ยฐC. The specific weight is 28 kg/m.

A. 240.69 kg

B. 982.45 kg

C. 299.64 kg

D. 423.45 kg

Explanation:

107. The discharge pressure of an air compressor is 5 times the suction pressure. If volume flow atย  suctionย  isย  0.1ย  m3/s,ย  whatย  isย  the suctionย  pressureย ย  ifย  compressorย  workย  isย ย  19.57 kWย  (use n = 1.35).

A. 97 kPa

B. 98 kPa

C. 99 kPa

D. 100 kPa

Explanation:

108.ย  Theย  initial condition of air in an air compressor is 98 kPa and 27ย  ยฐC and dischargesย  air at 450 kPa. The bore and stroke are 355 mm and 381 mm, respectively with percent clearance of 8% running at 300 rpm. Find the volume of air at suction.

A. 541.62 m3/hr

B. 551.62 m3/hr

C. 561.62 m3/hr

D. 571.62 m3/hr

Explanation:

109.ย  An air compressor has a suction volume of 0.35 m3/sย ย  at 97 kPa and discharges at 650 kPa. How much powerย  is saved by the compressor if there are two stages?

A. 18.27 kW

B. 16.54 kW

C. 13.86 kW

D. 11.58 kW

Explanation:

110. A two stage air intercooler has an intercooler pressure of 4 kg/cm2. What is the discharge pressure if suction pressure is 1 kg/cm2?

A. 3 kg/cm2

B. 9 kg/cm2

C. 12 kg/cm2

D. 16 kg/cm2

Explanation:

111.ย  Aย  two-stage air compressor at 100 kPa and 22ยฐC discharges to 750 kPa. If the intercooler intake isย  105ยฐC, determine the value of n.

A. 1.400

B. 1.326

C. 1.345

D. 1.288

Explanation:

112.ย  Aย  singleย  actingย  compressorย  hasย  aย  volumetricย  efficiencyย  ofย  89%,ย  operatesย  atย  500ย  rpm.ย  It takesย  inย  airย  atย  100ย  kPaย  andย  30ยฐCย  andย  dischargesย  itย  atย  600ย  kPa.ย  Theย  airย  handledย  isย  8ย  m3/min measuredย  atย  dischargedย  condition.ย  Ifย  compressionย  isย  isentropic,ย  findย  theย  effectiveย  mean pressure in kPa.

A. 233.34

B. 973.17

C. 198.34

D. 204.82

Explanation:

113.ย  Aย  water-jacketedย  air compressor handles 0.343 m3/s of air entering at 96.5 kPa and 21ยฐC andย  leavingย  atย  480ย  kPaย  andย  132ยฐC;ย  10.9ย  kg/hrย  ofย  coolingย  waterย  entersย  theย  jacketย  at 15ยฐC and leaves at 21ยฐC. Determine the compressor brake power.

A. 23.163 kW

B. 62.65 kW

C. 34.44 kW

D. 19.33 kW

Explanation:

114.ย  A double suction centrifugal pump delivers 20 ft3/s of water at a head of 12 m and running at 650 rpm. What is the specific speed of the pump?

A. 5014.12 rpm

B. 6453.12 rpm

C. 2770.73 rpm

D. 9968.73 rpm

Explanation:

115.ย  Determine the number of stages needed for a centrifugal pump if it is used to deliver 400 gal/min of water andย  pumpย  power of 15 hp. Each impeller develops a head of 30 ft.

A. 6

B. 4

C. 5

D. 7

Explanation:

116.ย  Theย  suctionย  pressureย  ofย  aย  pumpย  readsย  3ย  in.ย  ofย  mercuryย  vacuumย  andย  dischargeย  pressure readsย  140ย  psiย  isย  usedย  toย  deliverย  120ย  gpmย  ofย  waterย  withย  specificย  volumeย  ofย  0.0163ย  ft3/lb. Determine the pump work.

A. 4.6 kW

B. 5.7 kW

C. 7.4 kW

D. 8.4 kW

Explanation:

117.ย  Aย  submersibleย  pumpย  deliversย  350ย  gpmย  ofย  waterย  toย  aย  heightย  of 5 ft from the ground. The pumpย  whereย  installedย  150ย  ftย  belowย  theย  groundย  levelย  andย  aย  drawdownย  ofย  8ย  ft.ย  duringย  the operation.ย  If water level is 25 ft above the pump, determine the pump power.

A. 7.13 kW

B. 4.86 kW

C. 7.24 kW

D. 9.27 kW

Explanation:

118.ย  A vacuum pump is used to drain a flooded mine shaft of 20ยฐC water.ย  The pump pressure of water at this temperature is 2.34 kPa. The pump is incapable of lifting the water higher than 16 m. What is the atmospheric pressure?

A. 159.30

B. 132.33

C. 196.22

D. 171.9

Explanation:

119.ย  A submersible, multi-stage, centrifugal deep well pump 260 gpm capacity is installed in a wellย  27ย  ftย  belowย  theย  staticย  waterย  level and running at 300 0 rpm. Drawdown when pumping at rated capacity is 10 feet. The pump delivers the water into a 25,000 gallons capacity overhead storageย  tank.ย  Totalย  dischargeย  headย  developedย  byย  pump,ย  includingย  frictionย  inย  pipingย  isย  243ย  ft. Calculateย  theย  diameterย  ofย  theย  impel lerย  ofย  thisย  pumpย  inย  inchesย  ifย  eachย  impellerย  diameter developed a head of 38 ft.

A. 3.28

B. 5.33

C. 3.71

D. 6.34

Explanation:

120.ย  Aย  fanย  draws 1.42 m3 per second of air at a static pressure of 2.54 cm of water through a ductย  300ย  mmย  diameterย  andย  dischargesย  itย  throughย  aย  ductย  ofย  275ย  mmย  diameter.ย  Determine the static fan efficiency if total fan is 75% and air is measured at 25ยฐC and 760 mm Hg.

A. 50.11%

B. 53.69%

C. 65.67%

D. 45.34%

Explanation:

121.ย  A water cooler uses 50 lb/hr of melting ice to cool running water from 80ยฐF to 42ยฐF. Based on the inside coil area, Ui = 110 Btu/hr-ft2 -ยฐF. Find the gpm of water cooled.

A. 0.10 GPM

B. 0.21 GPM

C. 0.38 GPM

D. 0.45 GPM

Explanation:

122.ย  The charge in a Diesel engine consists ofย  18.34 grams of fuel, with lower heating value of 42,571ย  kJ/kg,ย  andย  409ย  gramsย  ofย  fuelย  andย  productsย  ofย  combustion.ย  Atย  theย  beginningย  of compression, T1 = 60ยฐC. Let rkย  = 14. For constant cp = 1.11 kJ/kg-ยฐC, what should be the cut-off ratio in the correspondingย ย  ideal cycle?

A. 2.05

B. 2.34

C. 5.34

D. 2.97

Explanation:

123. The gain of entropy during isothermal nonflow process of 5 lb of air at 60ยฐF is 0.462 Btu/ยฐR. Find the V1/V2.

A. 3.85

B. 0.259

C. 1.0

D. 0.296

Explanation:

124.ย  An auditorium seating 1500 people is to be maintained at 80ยฐF dry bulb and 60ยฐF wet bulb temperature when outdoor air is at 91ยฐF dry bulb and 75ยฐF wet bulb. Solar heat load is 110,000 Btu/hr and supply air is at 60ยฐF, determine the amountย  of supply air.

A. 93,229.17 lb/hr

B. 83,229.17 lb/hr

C. 73,229.17 lb/hr

D. 63,229.17 lb/hr

Explanation:

125. In a Brayton cycle that operates between temperature limits of 300 K and 1773 K with k = 1.4,ย  determineย  theย  temperatureย  atย  theย  endย  ofย  compressionย  (isentropic)ย  forย  maximumย  workย  of the cycle.

A. 780 K

B. 690.5 K

C. 730 K

D. 350 K

Explanation:

126.ย  Aย  35%ย  solutionย  leavesย  theย  absorberย  andย  30%ย  solutionย  entersย  theย  absorber.ย  Theย  heat removedย  from the absorber by cooling wate r is 547.6 Btu and ammonia is superheated by 10ยฐ. Find the poundย  per poundย  of ammonia gas from the evaporating coils.

A. 11

B. 12

C. 13

D. 14

Explanation:

127.ย  Aย  Carnotย  refrigerationย  systemย  operatesย  atย  Tmax/Tminย  =ย  1.5.ย  Findย  theย  kWย  perย  tonย  of refrigeration.

A. 1.91

B. 2.15

C. 1.76

D. 1.55

Explanation:

128.ย  Assume 8 ft3 of air at 100 psi and 100ยฐF are compressed isothermally to a volume of 2 ft3. For each end state of the process, find the bulk modulus.

A. 400 and 100 psi

B. 400 and 110 psi

C. 400 and 120 psi

D. 400 and 130 psi

Explanation:

129. Predict the pressure of nitrogen gas at T = 200 K andย  ฯย  = 0.00385 L/g and b = 0.00141 L/g; a = 0.178 L2-kPa/g2. Useย  Van der Waals equation.

A. 15,331 kPa

B. 14,331 kPa

C. 13,331 kPa

D. 12,331 kPa

Explanation:

130. A Francis turbine is to be operated at a speed of 600 rpmย  and with discharge of 4 m3/s. If r1 = 0.6 m,ย  ฮฒ = 110ยฐ, and the blade height B is 10 cm, what should be the guide vane angleย  ฮฑ1 for non-separating flow conditionย  at the runnerย  entrance?

A. 14.4ยฐ

B. 15.4ยฐ

C. 16.4ยฐ

D. 17.4ยฐ

Explanation:

131.ย  The total head of fan is 187 m and has a static pressure of 210 mm of water gage, what is the velocity of air flowing if the density of air is 1.15ย  kg/m3?

A. 6.85 m/s

B. 3.45 m/s

C. 4.39 m/s

D. 9.28 m/s

Explanation:

132.ย  A fan delivers 5.7 m3/sย ย  at a static pressure of 5.08 cm of water when operating at a speed of 400 rpm. The power input required is 2.963 kW. If 7.05 m3/sย ย  are desired in the same fan and installation, find the pressure in cm of water.

A. 7.77

B. 17.14

C. 11.43

D. 5.08

Explanation:

133.ย  Aย  rigidย  containerย  isย  closedย  atย  oneย  endย  andย  measuresย  8ย  inย  diameterย  byย  12ย  inย  long.ย  The containerย  isย  heldย  verticalย  and is slowly moved downward until the pressure in the container is 17 psia. What will be the depth of the top of the container from the free water surface?

A. 42.36 in

B. 59.29 in

C. 63.69 in

D. 69.82 in

Explanation:

134.ย  Anย  empty,ย  openย  canย  isย  30ย  cmย  highย  withย  aย  15ย  cmย  diameter.ย  Theย  can,ย  withย  theย  openย  end down,ย  isย  pushedย  underย  waterย  withย  aย  densityย  ofย  1000ย  kg/m3.ย  Findย  theย  waterย  levelย  inย  theย  can when the top of the can is 50 cm below the surface.

A. 17.20 cm

B. 2.12 cm

C. 4.20 cm

D. 5.87 cm

Explanation:

135.ย  A cylindrical pipe with water flowing downward at 0.03 m3/s having top diameter of 0.08, bottomย  diameter of 0.04 m and height of 1.5 m. Find the pressureย  insideย  the pipe.

A. 154.63 kPa

B. 197.93 kPa

C. 252.44 kPa

D. 243.92 kPa

Explanation:

136.ย  Determineย  theย  sizeย  ofย  pipeย  whichย  willย  deliverย  8ย  litersย  ofย  mediumย  oil ( ฮฝย  = 6.10 x 10-6 m2/s) assuming laminar flow conditions.

A. 622 mm

B. 754 mm

C. 950 mm

D. 835 mm

Explanation:

137.ย  The type of flow occupying in a 1 cm diameter pipe which water flows at a velocity of 2.50 m/s. Use ฮฝ = 1.13 x 10-6 m2/s for water.

A. turbulent

B. constant

C. laminar

D. none of these

Explanation:

138. What force is exerted by a water jet, 60 mm in diameter, if it strikes a wall at the rate of 15 m/s?

A. 636.17 N

B. 442.62 N

C. 764.23 N

D. 563.34 N

Explanation:

139.ย  A 300 mm diameter pipe discharges water at a rate of 200 li/s. Point 1 on the pipe has a pressure of 260 kPa and 3.4 m below point 1 is point 2 with a pressure of 300 kPa. Compute the head loss betweenย  points 1 and 2.

A. 4.29 m

B. 2.59 m

C. 6.32 m

D. 1.87 m

Explanation:

140.ย  Waterย  flowingย  atย  theย  rateย  ofย  10ย  m/sย  fromย  anย  orificeย  atย  bottomย  ofย  aย  reservoir.ย  Findย  the pressure at the bottomย  of reservoir.

A. 30 kPa

B. 40 kPa

C. 50 kPa

D. 60 kPa

Explanation:

141.ย  Steamย  flowsย  through a nozzle at 400ยฐC and 1ย  MPaย  (h = 3263.9 kJ/kg) with velocity of 300 m/s. Findย  the stagnation enthalpy.

A. 3300 kJ/kg

B. 3290 kJ/kg

C. 3320 kJ/kg

D. 3309 kJ/kg

Explanation:

142.ย  Airย  flowsย  throughย  aย  nozzleย  atย  a speed of 350 m/s. Find the stagnation temperature if the entrance temperatureย  is 200ยฐC.

A. 241.25ยฐC

B. 251.25ยฐC

C. 261.25ยฐC

D. 271.25ยฐC

Explanation:

143.ย  Carbonย  dioxideย  flowsย  throughย  aย  nozzleย  withย  aย  speedย  ofย  400ย  m/s.ย  Computeย  theย  dynamic temperature.

A. 92.56 K

B. 94.56 K

C. 96.56 K

D. 98.56 K

Explanation:

144.ย  Carbonย  dioxideย  flowsย  throughย  aย  nozzleย  withย  speed of 380 m/s. The entrance condition of nozzle is 250ยฐC and 1200 kPa. Find the stagnation pressure.

A. 2,136.34 kPa

B. 2,146.34 kPa

C. 2,156.34 kPa

D. 2,166.34 kPa

Explanation:

145.ย  Airย  entersย  aย  diffuserย  withย  aย  velocityย  ofย  200ย  m/s.ย  Determineย  theย  velocityย  ofย  soundย  ifย  air temperatureย  is 30ยฐC.

A. 349 m/s

B. 359 m/s

C. 369 m/s

D. 379 m/s

Explanation:

146.ย  Airย  flowsย  through a nozzle with temperature of entrance of 420 K stagnationย  temperature of 468 K. Find the Mach number.

A. 0.744

B. 0.754

C. 0.764

D. 0.774

Explanation:

147.ย  Air at 300 K and 200 kPa is heated at constant pressure to 600 K. Determine the change of internal energy.

A. 245.58 kJ/kg

B. 235.58 kJ/kg

C. 225.58 kJ/kg

D. 215.58 kJ/kg

Explanation:

148.ย  Anย  insulatedย  rigidย  tankย  initiallyย  containsย  1.5ย  lbย  ofย  heliumย  atย  80ยฐFย  andย  50ย  psia.ย  Aย  paddle wheel with power rating of 0.02 hp is operated within the tank for 30 min. Determine the final temperature.

A. 159.22ยฐF

B. 169.22ยฐF

C. 179.22ยฐF

D. 189.22ยฐF

Explanation:

149.ย  Aย  4 m2 asphalt pavement with emissivity of 0.85 has a surface temperature of 50ยฐC. Find the maximumย  rate of radiation that can be emitted from the surface.

A. 2,068 .32 watts

B. 2,078.32 watts

C. 2,088.32 watts

D. 2,098.32 watts

Explanation:

150.ย  Air at 10ยฐC and 80 kPa enters a diffuser of a jet engine steadily with a velocity of 200 m/s. The inlet area of diffuser is 0.40 m2.ย  Determine the mass flow rate of air.

A. 72.79 kg/s

B. 74.79 kg/s

C. 76.79 kg/s

D. 78.79 kg/s

Explanation:

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