151. The thermal efficiency of petrol and gas engines is about
15%
30%
50%
70%
✅ The correct answer is option B.
IC Engines and Nuclear Power Plants MCQs
152. Alpha-methyl-naphthalene (C11 H10) has a cetane number of
0
50
100
120
✅ The correct answer is option A.
153. The air-fuel ratio of the petrol engine is controlled by
carburettor
injector
governor
none of these
✅ The correct answer is option A.
154. The thermodynamic cycle on which the petrol engine works, is
Otto cycle
Joule cycle
Rankine cycle
Stirling cycle
✅ The correct answer is option A.
155. A turbo-jet does not require a turbine to drive the compressor.
TRUE
FALSE
✅ The correct answer is option B.
156. A diesel engine has inlet valve, fuel injection valve and exhaust valve.
Yes
No
✅ The correct answer is option A.
157. In a petrol engine, if diesel is used, then the engine will
not run
run more efficiently
run at high speed
explode
✅ The correct answer is option A.
158. Materials which make good moderators do not make good reflectors.
Correct
Incorrect
✅ The correct answer is option B.
159. The delay period in compression ignition engines depends upon
temperature and pressure in the cylinder at the time of injection
nature of the fuel mixture strength
relative velocity between the fuel injection and air turbulence pressure of residual gases
all of the above
✅ The correct answer is option D.
160. A diesel engine has compression ratio from
6 to 10
10 to 15
15 to 25
25 to 40
✅ The correct answer is option C.