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Compressors, Gas Turbines And Jet Engines MCQ
300 Important Compressors, Gas Turbines And Jet Engines MCQ Question and Answer | PDF Free Download
1.A centrifugal compressor works on the principle of
- AConversion of pressure energy into kinetic energy
- BConversion of kinetic energy into pressure energy
- CCentripetal action
- DGenerating pressure directly
2.The capacity of a compressor is 5 m/min refers to
- AStandard air
- BFree air
- CCompressed air
- DCompressed air at delivery pressure
3.The thermal efficiency of a gas turbine as compared to a diesel plant is
- ASame
- BMore
- CLess
- DDepends on other factors
4.A jet engine has
- ANo propeller
- BPropeller in front
- CPropeller at back
- DPropeller on the top
5.Isothermal compression though most efficient, but is not practicable because
- AIt requires very big cylinder
- BIt does not increase pressure muchIt is impossible in practice
- CIt is impossible in practice
- DCompressor has to run at very slow speed to achieve it
6.The type of rotary compressor used in aeroplanes, is of
- ACentrifugal type
- BAxial flow type
- CRadial flow type
- DNone of these
7.Only rocket engines can be propelled to space because
- AThey can generate very high thrust
- BThey have high propulsion efficiency
- CThese engines can work on several fuels
- DThey are not air breathing engines
8.Gas turbine as compared to steam turbine
- ARequires less space for installation
- BHas compressor and combustion chamber
- CHas less efficiency
- DAll of these
9.Water is injected in gas turbine cycle to
- AControl temperature
- BControl output of turbine
- CControl fire hazards
- DIncrease efficiency
10.Gas turbine works on
- ABrayton or Atkinson cycle
- BCarnot cycle
- CRankine cycle
- DEricsson cycle
11.A closed cycle gas turbine works on
- ACarnot cycle
- BRankine cycle
- CEricsson cycle
- DJoule cycle
12.Propulsion efficiency of the following order is obtained in practice
- A34%
- B50%
- C60%
- D72%
13.The maximum delivery pressure in a rotary air compressor is
- A10 bar
- B20 bar
- C30 bar
- D50 bar
14.In a closed cycle gas turbine, the air is compressed
- AIsothermally
- BPolytropically
- CIsentropically
- DNone of these
15.In a double acting compressor, the air is compressed
- AIn one cylinder
- BIn two cylinders
- CIn a single cylinder on both sides of the piston
- DIn two cylinders on both sides of the piston
16.The work-done on a compressor will be minimum if air is taken from
- AThe atmosphere
- BA source at 0° C
- CA source of low temperature air
- DA source of low temperature air
17.Open cycle gas turbine works on
- ABrayton or Atkinson cycle
- BRankine cycle
- CCarnot cycle
- DEricsson cycle
18.A turboprop is preferred to turbojet because
- AIt has high propulsive efficiency at high speeds
- BIt can fly at supersonic speeds
- CIt can fly at high elevations
- DIt has high power for take off
19.In jet propulsion power unit, the inlet duct of diverging shape is used in order to
- ACollect more air
- BConvert kinetic energy of air into pressure energy
- CProvide robust structure
- DBeautify the shape
20.Gas turbine cycle with regenerator
- AIncreases thermal efficiency
- BAllows high compression ratio
- CDecreases heat loss is exhaust
- DAllows operation at very high altitudes