Applied Thermodynamics (3161910) MCQs

MCQs of Fuel Air and Actual Cycles

Showing 21 to 28 out of 28 Questions
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21.
The major loss in a C.I. engine is
(a) direct heat loss
(b) loss due to incomplete combustion
(c) rubbing friction loss
(d) pumping loss
Answer:

Option (b)

22.
In an actual S.I engine the pumping loss with respect to speed
(a) increases
(b) decreases
(c) remains the same
(d) none of the mentioned
Answer:

Option (b)

23.
In petrol engine the actual pressure developed compared to the predicted maximum pressure is
(a) 90%
(b) 70%
(c) 50%
(d) 25%
Answer:

Option (c)

24.
Energy released in actual cycle is about _____________ of the fuel input.
(a) 90%
(b) 70%
(c) 50%
(d) 25%
Answer:

Option (a)

25.
The actual efficiency of a good engine is about _____________ of the estimated air fuel cycle efficiency.
(a) 100%
(b) 85%
(c) 50%
(d) 25%
Answer:

Option (b)

26.
The ratio of the actual efficiency and the and the fuel air cycle efficiency for C.I. engines is about
(a) 0.2-0.3
(b) 0.5-0.6
(c) 1
(d) 0.6-0.8
Answer:

Option (d)

27.
Fuel air efficiency is less than air standard efficiency by an amount equal to
(a) pumping loss
(b) friction loss
(c) loss due to specific heat and chemical equilibrium
(d) exhaust blow down loss
Answer:

Option (c)

28.
A diesel engine has
(a) one valve
(b) two valves
(c) three valves
(d) four valves
Answer:

Option (c)

Showing 21 to 28 out of 28 Questions
1 2 3