# Compressors, Gas Turbines and Jet Engines Objective Questions with Answers – Set 15

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## Q1. Separators are generally used in air compressor installations

(A) Before the inter-cooler
(B) After the inter-cooler
(C) Between the after-cooler and receiver
(D) Before first stage suction

## Q2. In jet engines, paraffin is usually used as the fuel because of its

(A) High calorific value
(B) Ease of atomisation
(C) Low freezing point
(D) Both (A) and (C) above

## Q3. Work ratio of a gas turbine may be improved by

(A) Decreasing the compression work
(B) Increasing the compression work
(C) Increasing the turbine work
(D) Both (A) and (C) above

## Q4. In a centrifugal compressor, the flow of air is __ to the axis of compressor.

(A) Parallel
(B) Perpendicular
(C) Inclined
(D) None of these

## Q5. For an irreversible gas turbine cycle, the efficiency and work ratio both depend on

(A) Pressure ratio alone
(B) Maximum cycle temperature alone
(C) Minimum cycle temperature alone
(D) Both pressure ratio and maximum cycle temperature

## Q6. A rocket engine for the combustion of its fuel

(A) Carries its own oxygen
(B) Uses surrounding air
(C) Uses compressed atmospheric air
(D) Does not require oxygen

(A) 700°C
(B) 2000°C
(C) 1500°C
(D) 1000°C

(A) 550 km/hr
(B) 1050 km/hr
(C) 1700 km/hr
(D) 2400 km/hr

(A) 75%
(B) 85%
(C) 90%
(D) 99%

## Q10. A rocket works with maximum overall efficiency when air craft velocity is equal to the

(A) Jet velocity
(B) Twice the jet velocity
(C) Half the jet velocity
(D) Average of the jet velocity

## Q11. In air breathing jet engine, the jet is formed by expanding

(A) Highly heated atmospheric air
(B) Solids
(C) Liquid
(D) Plasma

## Q12. The compressor capacity with decrease in suction temperature

(A) Increases
(B) Decreases
(C) Remain unaffected
(D) May increase or decrease depending on compressor capacity

## Q13. It is not possible to use closed gas turbine cycle in aeronautical engines because

(A) It is inefficient
(B) It is bulky
(C) It requires cooling water for its operation
(D) None of the above

(A) 34%
(B) 50%
(C) 60%
(D) 72%

## Q15. Ramjet engine

(A) Is self operating at zero flight speed
(B) Is not self operating at zero flight speed
(C) Requires no air for its operation
(D) Produces a jet consisting of plasma

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