81. If the fuel is rich in fissionable material, the reactor can be made more compact than if the percentage of fissionable atoms is small.
Agree
Disagree
✅ The correct answer is option A.
IC Engines and Nuclear Power Plants MCQs
82. Thermal efficiency of a two stroke cycle engine is __________ a four stroke cycle engine.
equal to
less than
greater than
✅ The correct answer is option B.
83. In a petrol engine, the charge is ignited with the help of a spark plug.
Yes
No
✅ The correct answer is option A.
84. The mean effective pressure of a diesel engine having fixed compression ratio will __________ if cut off ratio decreases.
increase
decrease
✅ The correct answer is option B.
85. Which of the following fuel detonates readily ?
Benzene
Iso-octane
Normal heptane
Alcohol
✅ The correct answer is option C.
86. In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.
equal to
below
above
✅ The correct answer is option B.
87. The firing order in an I.C. engine depends upon
arrangement of the cylinders
design of crankshaft
number of cylinders
all of these
✅ The correct answer is option D.
88. Detonation is harmful due to
increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
high intensity of knock causes crankshaft vibration and the engine runs rough
none of the above
✅ The correct answer is option D.
89. The slowing down of fast neutrons is desirable because slow moving neutrons are more effective than fast neutrons in triggering fission.
Agree
Disagree
✅ The correct answer is option A.
90. The maximum propulsive efficiency of a turbo-jet engine is at a speed of
1000 km/h
2000 km/h
2400 km/h
3000 km/h
✅ The correct answer is option C.