Internal Combustion Engines
The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is

Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
Four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine
Four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine
Two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine

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Internal Combustion Engines
As compared to air standard cycle, in actual working, the effect of variation in specific heats is to

Reduce maximum pressure and maximum temperature
Increase maximum pressure and maximum temperature
Decrease maximum pressure and increase maximum temperature
Increase maximum pressure and decrease maximum temperature

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Internal Combustion Engines
If V₁ is the jet velocity and V₀ is the vehicle velocity, then the propulsive efficiency of a rocket is given by

[2(V₀/V₁)]/ [1 + (V₀/V₁)²]
(V₀/V₁)/ [1 + (V₀/V₁)²]
V₁/(V₀ + V₁)
V₀/(V₀ + V₁)

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