Top 350+ Solved Heat Engines MCQ Questions Answer
Q. Speed drop is the
a. Drop in engine speed
b. Increasing in engine speed
c. Reduction in engine speed from no loads to full load
d. Change in engine speed while fuel supply remains the same
e. None of the above
Q. For reciprocating air compressor the law of compression desired is isothermal and that may be possible by
a. Very high speeds
b. very low speeds
c. any speed as speed does not affect the compression law
d. None of the above
e. Carbon dioxide
Q. In a surface condenser near to the air pump suction the vacuum is 500 mm of mercury with 730 mm of mercury height in a barometer. The pressure near the air pump suction would be
a. 0.69 kg/sq-cm
b. 1.213 kg/sq-cm
c. 0.313 kg/sq-cm
d. 0.687 kg/sq-cm
e. 1230 mm Hg
Q. Which of the following fuel can be obtained by fermentation of vegetable matter?
a. Alcohol
b. Gasoline
c. Benzene
d. Carbon dioxide
e. Diesel
Q. If performance of SI engines of different manufacture having different capacities, sizes and systems are to be compared the common parameter would be
a. Engine cylinder diameter
b. H.P.
c. Weight of engine
d. Speed
e. Mean effective pressure
Q. Which of the following is not a part of diesel engine?
a. Gudgeon pin
b. Air filter
c. Oil pump
d. Condenser
e. Lubricating oil filter
Q. Compression ratio for spark ignition engines varies in the range
a. 6 to 12
b. 20 to 25
c. 4 to 6
d. 25 to 30
e. 12 to 20
Q. If a heat engine given an output of 3.5 kW and input is 10000 Joules per second, the thermal efficiency of the engine will be
a. 66?%
b. 35%
c. 30%
d. 65%
e. 55%
Q. The capacity of an automobile battery is expressed in terms of
a. Number of cells
b. Number of plate
c. Ampere hours
d. Amperes
e. Voltage
Q. Engines are supercharged
a. To increase engine durability
b. To increase specific power output
c. To increase air-fuel ratio
d. To improve heat transfer
e. To reduce combustion temperature
Q. Thermodynamic equilibrium is completely defined by the specifications of the
a. Internal energy
b. Enthalpy
c. Generalized displacements
d. All above together
e. None of the above
Q. Within the boiler the temperature of steam is highest in
a. Water drum
b. water tubes
c. Superheater outlet
d. Water walls
e. Superheater inlet
Q. A closed vessel contains air at 1.2 ata and 57?C. The pressure of air in the vessel if the contents of the vessel are cooled to 37?C would be
a. 1.2 ata
b. 1.127 ata
c. 2.327 ata
d. 0.563 ata
e. 0.073 ata
Q. Which one of the following acts as ignition accelerator for C.I. engines fuel
a. Acetone peroxide
b. Hydrogen peroxide
c. None of above
d. n heptane
e. Armatic compounds