Top 350+ Solved Heat Engines MCQ Questions Answer
Q. A certain gas occupies 2 cu-m at a temperature of 400?C. It receives heat at constant pressure till its temperature is doubled. The change in volume would be
a. 0.19 cu-m
b. 3.8 cu-m
c. 0.038 cu-m
d. 0.019 cu-m
e. 3.188 cu-m
Q. If the power factor of an electrical system is unity, it means
a. Efficiency is least
b. Entire power is consumed in reactive power
c. Entire power pulls the load
d. Equipment is running properly
e. Magnetism generated within the equipment is negligible
Q. A fixed quantity of heat is to be added to a system under specific conditions. The process in which the entropy change will be maximum is
a. Constant pressure process
b. Constant volume process
c. Constant temperature process
d. Isentropic process
e. None of the above
Q. Air standard efficiency of an I.C. engine depends on
a. Compression ratio
b. Speed of operation
c. Fuel used
d. Torque
e. All of the above
Q. Which of the following is false statement?
a. Fuel consumption of engine increases if silencer is choked
b. Fuel consumption of engines decreases if air filter is choked
c. Fuel consumption increases if exhaust valve is burnt
d. Fuel consumption increases if lean mixture is supplied
e. All of the above
Q. Which of the boiler provides superheated steam?
a. Locomotive boiler
b. Lancashire boiler
c. Cornish boiler
d. All of the above
e. None of the above
Q. Which of the following particles will be smallest in size?
a. Drizzle
b. Mist
c. Smog
d. Fog
e. Rain
Q. Dew point temperature is an indication of
a. Condition of air
b. Condition of moisture in air
c. Dryness of air
d. Lowest temperature where air and water vapour start separating
e. Moisture constant of air
Q. High air-fuel ratio in gas turbines
a. Reduces the exhaust temperature
b. Improves thermal efficiency
c. Increases power output
d. Restricts damage to turbine blades
e. None of the above
Q. If a steam injector fails to lift the water the trouble may not be due to
a. Too low steam pressure for list
b. Water pipe clogged
c. Water supply to cold
d. End of water pipe not submerged
e. None of the above
Q. Working in the cryogenic range means dealing with temperatures
a. Below absolute zero
b. Below zero degree centigrade
c. Between - 190?C and absolute zero
d. Prevailing normally in the atomsphere
e. Between zero degree centigrade and 190?C
Q. Which of the following will not be seen in a boiler using pulverised fuel?
a. Chain in great stoker
b. Feed pump
c. Economiser
d. Superheater
e. Chimney
Q. The governor for steam turbine is driven by
a. Main shaft
b. Separate motor
c. Belt drive
d. Feed pump motor
e. None of the above
Q. Air preheater in a boiler will be invariably located between
a. Condenser and feed water pump
b. Water treatment plant and furnace
c. Boiler furnace and chimney
d. Economiser and feed pump
e. Forced draft fan and furnace