Applied Thermodynamics (3161910) MCQs

MCQs of Fuel Air and Actual Cycles

Showing 11 to 20 out of 28 Questions
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11.
The fuel air cycle efficiency _______________ with the compression ratio.
(a) increases
(b) decreases
(c) remains the same
(d) none of the mentioned
Answer:

Option (a)

12.
The maximum pressure and maximum temperature ____________ with compression ratio.
(a) increases
(b) decreases
(c) remains the same
(d) none of the mentioned
Answer:

Option (a)

13.
Fuel air ratio affects the maximum power output of the engine due to
(a) higher specific heats
(b) chemical equilibrium losses
(c) (a) & (b) both
(d) none of the mentioned
Answer:

Option (c)

14.
Mean effective pressure at a given compression ratio is maximum when the air-fuel ratio is
(a) higher than stoichiometric
(b) lower than stoichiometric
(c) equal to stoichiometric
(d) none of the mentioned
Answer:

Option (b)

15.
When the mixture is lean
(a) efficiency is less
(b) power output is less
(c) maximum temperature and pressure are higher
(d) all of the mentioned
Answer:

Option (b)

16.
Time loss factor in Actual Cycle is due to
(a) progressive combustion
(b) heat loss through cylinder walls
(c) gas leakage
(d) friction
Answer:

Option (a)

17.
If the spark timing is at TDC, the work is
(a) more
(b) less
(c) equal
(d) none of the mentioned
Answer:

Option (b)

18.
When the spark is advanced, the work output is less as
(a) the peak pressure is low
(b) the peak temperature is low
(c) additional work is required to compress the burning gas
(d) frictional losses increase
Answer:

Option (c)

19.
Optimum spark timing gives
(a) higher mean effective pressure
(b) higher efficiency
(c) higher mean effective pressure and higher efficiency
(d) none of the mentioned
Answer:

Option (c)

20.
The major loss in a S.I. engine is due to
(a) exhaust blow down
(b) pumping
(c) incomplete combustion
(d) variation in specific heat and chemical equilibrium
Answer:

Option (d)

Showing 11 to 20 out of 28 Questions
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