Compressors, Gas Turbines and Jet Engines Online Quiz - ObjectiveBooks

# Quiz Questions

01. The maximum combustion pressure in gas turbine is ________ as compared to I.C. engine.

02. The increase in pressure in a roots blower is entirely due to back flow of air.

03. In a gas turbine, air is obtained from the atmosphere and compressed in an air compressor.

04. A gas turbine used in aircraft should have low weight and small frontal area.

05. In reciprocating air compressors, isothermal efficiency is used for all sorts of calculations.

06. The operation of lifts, rams and pumps make use of compressed air.

07. For minimum work in multistage compression, the workdone on all stages should be equal.

08. Slip factor in a centrifugal compressor indicates the amount of air leaked from the storage vessel.

09. The perfect intercooling, in multistage compression, means that the temperature of air at inlet to subsequent stages is equal to the initial temperature.

10. The ratio of the isentropic work to the Euler's work is known as pressure coefficient.

11. For a multistage compressor, the polytropic efficiency is constant throughout for all the stages.

12. The ratio of the isothermal power to the shaft power or brake power of the motor or engine required to drive the compressor is called overall isothermal efficiency.

13. The basic principle of the rocket propulsion is the same as that of jet propulsion.

14. A simple turbojet engine is basically a gas turbine engine equipped with a propulsive nozzle and diffuser.

15. The volumetric efficiency of the compressor is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.

16. A centrifugal compressor is an axial flow compressor.

17. A compressor must be driven by some prime mover.

18. In a compressed air system, the temperature of air discharged from the air motor is ________ than the initial compressor intake temperature.

19. In axial flow compressors, the flow of air is parallel to the axis of compressor.

20. A receiver in compressor installations is used to damp pressure waves in compressor discharge.

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