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

Practice Test: Question Set - 01


1. If the flow of air through the compressor is perpendicular to its axis, then it is a
    (A) Reciprocating compressor
    (B) Centrifugal compressor
    (C) Axial flow compressor
    (D) Turbo compressor

2. Gas turbines use following type of air compressor
    (A) Centrifugal type
    (B) Reciprocating type
    (C) Lobe type
    (D) Axial flow type

3. The gas in cooling chamber of a closed cycle gas turbine is cooled at
    (A) Constant volume
    (B) Constant temperature
    (C) Constant pressure
    (D) None of these

4. The maximum combustion pressure in gas turbine as compared to I.C. engine is
    (A) More
    (B) Less
    (C) Same
    (D) Depends on other factors

5. In a closed cycle gas turbine, the air is compressed
    (A) Isothermally
    (B) Polytropically
    (C) Isentropically
    (D) None of these

6. The closed cycle in gas turbines
    (A) Provides greater flexibility
    (B) Provides lesser flexibility
    (C) In never used
    (D) Is used when gas is to be burnt

7. The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)
    (A) r ɣ-1
    (B) 1 - r ɣ-1
    (C) 1 - (1/r) ɣ-1/ɣ
    (D) 1 - (1/r) ɣ/ɣ-1

8. Pick up the correct statement
    (A) Large gas turbines use radial inflow turbines
    (B) Gas turbines have their blades similar to steam turbine
    (C) Gas turbine's blade will appear as impulse section at the hub and as a reaction section at tip
    (D) Gas turbines use both air and liquid cooling

9. The degree of reaction is usually kept ________ for all types of axial flow compressors.
    (A) 0.2
    (B) 0.3
    (C) 0.4
    (D) 0.5

10. Ram compression in turbojet involves
    (A) Reduction of speed of incoming air and conversion of part of it into pressure energy
    (B) Compression of inlet air
    (C) Increasing speed of incoming air
    (D) Lost work

11. A compressor mostly used for supercharging of I.C. engines is
    (A) Radial flow compressor
    (B) Axial flow compressor
    (C) Roots blower
    (D) Reciprocating compressor

12. 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

13. 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

14. 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

15. 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

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Compressors, Gas Turbines and Jet Engines:
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