Top 350+ Solved Heat Engines MCQ Questions Answer
Q. The enthalpy of vaporisation is minimum at
a. 100?C
b. Critical temperature
c. 0?C
d. 25 to 30
e. Absolute zero
Q. Which part of a gas turbine is subjected to the highest temperature?
a. Blades
b. Regenerator
c. Intercooler
d. Compressor coupling
e. Compressed air
Q. In case of glass tube type water level indicator for a boiler
a. One end of the tube is connected to water space and the other is connected to steam space in the drum
b. Both ends of the tube are connected to water space
c. One end of the tube is connected to water space and the other end connected to chimney
d. One end of the tube is connected to water space and the other end is connected to superheated steam outlet from superheater
e. One end of the tube is connected to water space and the other is open to atmosphere
Q. Baffles are provided on engines to
a. Improve engine performance
b. Improve heat transfers rate
c. Guard against dirt and dust
d. Assist in starting the engine
e. Reduce fuel consumption
Q. A rope brake dynamometer falls under the category of
a. Transmission type dynamometer
b. Hydraulic dynamometer
c. Mechanical friction type dynamometer
d. Electrical type dynamometer
e. Torsion type dynamometer
Q. Live storage of fuel means
a. Fuel stored to meet day's requirement for the boiler
b. Fuel stored for supply at any time during emergency
c. Fuel stored at the plant
d. Fuel stored near the burners
e. None of the above
Q. In closed cooling system
a. Hot water is recirculated after cooling
b. Constant fresh water for cooling is supplied
c. Water surrounding the cylinder is allowed to evaporate
d. Air and water cooling is simultaneously used
e. Water does not flow
Q. In a four stroke petrol engine
a. Intake valve closes before TDC
b. Intake valve closes after BDC
c. Exhaust valve closes before BDC
d. Exhaust valve open before BDC
e. None of the above
Q. Coking is
a. In boiler furnace some coal becomes plastic and forms lumps or masses of coke
b. Making cakes of coal out of fine powders
c. Coal produced from burning of wood in inert atmosphere
d. Free burning coals are known as coking coals
e. None of the above
Q. Shock effect in the nozzle generally occurs in
a. Inlet
b. Converging section
c. Throat
d. Diverging section
e. Exit
Q. Dehydration is the process of removal of
a. hydrogen from water
b. hydrogen from hydrocarbon
c. moisture from anything that is wet
d. hydrogen from alcohols
e. addition of water vapour to a substance
Q. For minimum work in multistage compression, the work done on
a. First stage should be least
b. Last stage should be least
c. All stage should be equal
d. There is no such consideration
e. None of the above
Q. For the same maximum pressure and heat input the least efficient cycle is
a. Diesel cycle
c. Otto cycle
d. Weight of engine
e. Brayton
Q. A Curtis turbine is
a. A velocity compounded readtion turbine
b. A pressure compounded reaction turbine
c. A pure reaction turbine
d. An impulse reaction turbine
e. None of the above
Q. If the performance of diesel engines of different sizes, cylinder dimensions and horse power ratings are to be compared, which of the following parameter can be used for such comparison?
a. Air-fuel ratio
b. Brake specific fuel consumption
c. Volumetric efficiency
d. Swept volume
e. None of the above