Compressors, Gas Turbines and Jet Engines
Which of the following statement is correct relating to rocket engines?

The stagnation conditions exist at the combustion chamber
The combustion chamber in a rocket engine is directly analogous to the reservoir of a supersonic wind tunnel
The exit velocities of exhaust gases are much higher than those in jet engine
All of these

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Compressors, Gas Turbines and Jet Engines
If p₁, is the pressure of air entering the L.P. cylinder and p₂ is the pressure of air leaving the L.P. cylinder (or inter-cooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D₁ = Dia. of L.P. cylinder, and D₂ = Dia. of H.P. cylinder)

D₁/D₂ = p₂/p₁
D₁/D₂ = p₁/p₂
D₁/D₂ = p₁ p₂
None of these

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Compressors, Gas Turbines and Jet Engines
Producer gas is produced by

Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 65°C
Carbonisation of coal
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

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