# Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 01

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## Q1. In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into

(A) Atmosphere
(B) Vacuum
(C) Discharge nozzle
(D) Back to the compressor

## Q2. To avoid moisture troubles, the branch connections from compressed air lines should be taken from

(A) Top side of main
(B) Bottom side of main
(C) Left side of main
(D) Right side of main

## Q3. Maximum work is done in compressing air when the compression is

(A) Isothermal
(C) Polytropic
(D) None of the above

## Q4. In the aircraft propellers

(A) The propulsive matter is caused to flow around the propelled body
(B) Propulsive matter is ejected from within the propelled body
(C) Its functioning does not depend on presence of air
(D) All of the above

## Q5. In an axial flow compressor, the ratio of pressure in the rotor blades to the pressure rise in the compressor in one stage is known as

(A) Work factor
(B) Slip factor
(C) Degree of reaction
(D) Pressure coefficient

## Q6. The thrust of a jet propulsion power unit can be increased by

(A) Injecting water into the compressor
(B) Burning fuel after gas turbine
(C) Injecting ammonia into the combustion chamber
(D) All of the above

## Q7. The work-done on a compressor will be minimum if air is taken from

(A) The atmosphere
(B) A source at 0° C
(C) A source of low temperature air
(D) A source of high temperature air

## Q8. To avoid moisture troubles, the compressed air main line should

(A) Rise gradually towards the point of use
(B) Drop gradually towards the point of use
(C) Be laid vertically
(D) Be laid exactly horizontally

## Q9. An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes

(A) One adiabatic, two isobaric, and one constant volume
(B) Two adiabatic and two isobaric
(C) Two adiabatic, one isobaric and one constant volume
(D) One adiabatic, one isobaric and two constant volumes

## Q10. In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of

(A) Vacuum
(B) Atmospheric air
(C) Compressed air
(D) Oxygen alone

## Q11. The volumetric efficiency of a compressor

(A) Increases with decrease in compression ratio
(B) Decreases with decrease in compression ratio
(C) Increases with increase in compression ratio
(D) Decreases with increase in compression ratio

## Q12. A compressor mostly used for supercharging of I.C. engines is

(B) Axial flow compressor
(C) Roots blower
(D) Reciprocating compressor

## Q13. The efficiency and work ratio of a gas turbine plant can be increased by

(B) Injecting water in/around combustion chamber
(C) Reheating the air after partial expansion in the turbine
(D) All of the above

## Q14. Volumetric efficiency of a compressor without clearance volume

(A) Increases with increase in compression ratio
(B) Decreases with increase in compression ratio
(C) Is not dependent upon compression ratio
(D) May increase/decrease depending on compressor capacity

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