Correct Answer:- Option-B
Question72:-In a SI engine which statement is not correct about normal combustion
A:-Strong pressure pulsations are not observed
B:-Spark is given before TDC
C:-In the ignition lag phase a self propagating nucleus of flame is formed

D:-At the completion of the after burning phase cylinder pressure reaches its
maximum

Correct Answer:- Option-D
Question73:-About diesel knock in Cl Engines which statement is incorrect
A:-Diesel knock is characterised by pressure pulsations
B:-Diesel knock occurs in the initial stages of combustion
C:-Chances of Diesel knock decreases as the ignition delay period increases

D:-Larger ignition delay results in more un-burnt fuel at the start of
combustion

Correct Answer:- Option-C

Question74:-Phase of combustion that starts from the state of maximum cylinder
pressure and ends at the point of maximum cylinder temperature in Cl engine
combustion is known as

A:-Period of controlled combustion
B:-Ignition delay period
C:-Period of rapid combustion
D:-Period of after burning
Correct Answer:- Option-A
Question75:-Which is the limitation of supercharging
A:-Mean effective pressure increases
B:-Engine output increases for the same swept volume
C:-Intake air density increases
D:-Mechanical load on the engine components increases
Correct Answer:- Option-D

Question76:-Which is the desirable property of a refrigerant to be used in
automobile air conditioning system

A:-High freezing point temperature
B:-Low value of COP

C:-Low boiling point temperature
D:-Low latent heat value

Correct Answer:- Option-C

Question77:-Match the following
(i) Heat Engines (a) 7161101 1055