Internal Combustion Engines
A fuel of cetane number 40 has the same ignition quality as a mixture of

40% cetane and 60% alpha methyl naphthalene
40% alpha methyl naphthalene and 60% cetane
40% diesel and 60% petrol
40% petrol and 60% diesel

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

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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

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

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