Top 350+ Solved Heat Engines MCQ Questions Answer
Q. Paraffins in petrol have the general formula
a. Cn Hn
b. Cn H2n + 2
c. Cn H2n - 4
d. Cn H2n
e. Cn H2n - 2
Q. If an air cooled compressor gets over-heated during operation, the probable cause cannot be
a. Direction of rotation wrong
b. Valve strips broken
c. Leadage in intercooler
d. Insufficient lubricating oil
e. Intake fliter clogged
Q. The phenomenon of hunting is associated with
a. Governors
b. Gears
c. Cloth mechanism
d. Carburetors
e. Tappet valves
Q. The term regeneration is closely associated with
a. Steam engines
b. Steam turbines
c. Diesel engines
d. Gas engines
e. Wankel engines
Q. The air standard efficiency of a turbine cycle is 56.5%, which one of the following may be Carnot efficiency between the temperature limits of the cycle?
a. 75%
b. 64%
c. 50%
d. 100%
e. 56.50%
Q. A wankel engine is
a. Rotory engine
b. Turbine engine
c. Jet engine
d. Reciprocating engine
e. Hybrid engine
Q. The temperatures and pressures for boiler are given below. Which of these boilers can be classified as super-critical pressure boiler?
a. 250 psi, 150?C
b. 100 kg/cm2, 450?C
c. 10 kg/cm2, 150?C
d. 150 kg/cm2, 500?C
e. 218 kg/cm2, 540?C
Q. Motor cycle not using deflector type piston usually utilise
a. Reverse flow scavanging
b. Ideal scavanging
c. Uniflow scavanging
d. Natural scavanging
e. Loop scavanging
Q. Direction of feed water is done because
a. It reduces weight of water to be handled
b. It reduced priming difficulties in feed pumps
c. It reduces corrosion caused by oxygen present in air
d. It reduces amount of heat required to convert water into steam
e. None of the above
Q. The dryness fraction of steam within a turbine is usually not allowed to fali below
a. Unity
b. 0.45
c. 0.8
d. 0.9
e. 0.99
Q. Which of the following is an accessory for a boiler?
a. Stop valve
b. Feed check valve
c. Safety valve
d. Feed pump
e. Blow off cock
Q. The molecules move in a solid
a. At random
b. Back and forth like tiny pendulum
c. In irregular motion
d. In circular motion
e. None of above
Q. In all a four stroke four cylinder engine will have how many valves?
a. 8
b. 16
c. none
d. 4
e. Carbon dioxide
Q. Latent heat is
a. Heat required to change the state or condition under which the substance exists
b. Heat that does not follow first law of thermodynamics
c. Heat required to change the state of substance from liquid state to solid state
d. Heat required to change the substance from solid to gaseous state
e. Heat cannot be detected
Q. Steam consumption per kWh of electricity generated in a modern power plant is of the order of
a. 10 -12 kgs
b. 5 - 7 kgs
c. 8 - 10 kgs
d. 2 - 4 kgs
e. 1 - 2 kgs