Exercise: Ic Engines And Nuclear Power Plants

Questions for: Ic Engines And Nuclear Power Plants

The increase of cooling water temperature in petrol engine will __________ the knocking tendency.
A:
not effect
B:
decrease
C:
increase
D:
Answer: C
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The pressure inside the cylinder is __________ the atmospheric pressure during the exhaust stroke.
A:
equal to
B:
below
C:
above
D:
Answer: C
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The self ignition temperature of petrol is __________ as compared to diesel oil.
A:
same
B:
lower
C:
higher
D:
Answer: C
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A diesel engine has
A:
one valve
B:
two valves
C:
three valves
D:
four valves
Answer: C
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The thermal efficiency of diesel engines is about
A:
15%
B:
30%
C:
50%
D:
70%
Answer: D

The thermal efficiency of diesel engines is about 30-50%. This means that for every 100 units of fuel energy input, the engine is able to convert 30-50 units of that energy into useful work. The remaining energy is lost as heat or exhaust.

The maximum theoretical efficiency of a diesel engine is about 70%. However, this is rarely achieved in practice due to factors such as friction, heat loss, and incomplete combustion.

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