Compressors, Gas Turbines and Jet Engines Objective Questions with Answers - Set 14

Practice Test: Question Set - 14

1. Pick up the wrong statement
    (A) Large gas turbines employ axial flow compressors
    (B) Axial flow compressors are more stable than centrifugal type compressors but not as efficient
    (C) Axial flow compressors have high capacity and efficiency
    (D) Axial flow compressors have instability region of operation

2. The power available for takeoff and climb in case of turbojet engine as compared to reciprocating engine is
    (A) Less
    (B) More
    (C) Same
    (D) May be less or more depending on ambient conditions

3. A closed gas turbine in which fuel is burnt directly in the air is not possible because of
    (A) Paucity of O2
    (B) Increasing gas temperature
    (C) High specific volume
    (D) High friction losses

4. Choose the correct statement
    (A) Gas turbine requires lot of cooling water
    (B) Gas turbine is capable of rapid start up and loading
    (C) Gas turbines has flat efficiency at part loads
    (D) Gas turbines have high standby losses and require lot of maintenance

5. In the cross compounding of the gas turbine plant
    (A) H.P. compressor is connected to H.P. turbine and L.P. compressor to L.P. turbine
    (B) H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine
    (C) Both the arrangements can be employed
    (D) All are connected in series

6. A jet engine works on the principle of conservation of
    (A) Mass
    (B) Energy
    (C) Flow
    (D) Linear momentum

7. Which of the following fuels can be used in turbojet engines?
    (A) Liquid hydrogen
    (B) High speed diesel oil
    (C) Kerosene
    (D) Methyl alcohol

8. Propulsive efficiency is defined as ratio of
    (A) Thrust power and fuel energy
    (B) Engine output and propulsive power
    (C) Propulsive power and fuel input
    (D) Thrust power and propulsive power

9. 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

10. 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

11. 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

12. Propulsion efficiency of the following order is obtained in practice
    (A) 34%
    (B) 50%
    (C) 60%
    (D) 72%

13. In jet engines the products of combustion after passing through the gas turbine are discharged into
    (A) Atmosphere
    (B) Back to the compressor
    (C) Discharge nozzle
    (D) Vacuum

14. The air entry velocity m a rocket as compared to aircraft is
    (A) Same
    (B) More
    (C) Less
    (D) Zero

15. The weight per horse power ratio for gas in Turbine as compared to I.C. engine and steam turbine is
    (A) Same
    (B) Higher
    (C) Lower
    (D) None of these

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