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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.Actual compression curve is
- ASame as isothermal
- BSame as adiabatic
- CBetter than isothermal and adiabatic
- DIn between isothermal and adiabatic
2.Work ratio of a gas turbine plant is ratio of
- ANet work output and work done by turbine
- BNet work output and heat supplied
- CWork done by turbine and heat supplied
- DWork done by turbine and net work output
3.In a reciprocating air compressor, the compression work per kg of air
- AIncreases as clearance volume increases
- BDecreases as clearance volume increases
- CIs independent of clearance volume
- DIncreases as clearance volume decreases
4.The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called
- ACompressor efficiency
- BVolumetric efficiency
- CIsothermal efficiency
- DMechanical efficiency
5.A large clearance volume in a reciprocating compressor results in
- AReduced volume flow rate
- BIncreased volume flow rate
- CLower suction pressure
- DLower delivery pressure
6.Diffuser in a compressor is used to
- AIncrease velocity
- BMake the flow streamline
- CConvert pressure energy into kinetic energy
- DConvert kinetic energy into pressure energy
7.Pick up wrong statement. Surging phenomenon in centrifugal compressor depends on
- AMass flow rate
- BPressure ratio
- CChange in load
- DStagnation pressure at the outlet
8.Losses in a centrifugal compressor are due to
- AInlet losses
- BImpeller channel losses
- CDiffuser losses
- DAll of the above
9.The volumetric efficiency for reciprocating air compressors is about
- A10 to 40%
- B40 to 60%
- C60 to 70%
- D70 to 90%
10.Cylinder clearance in a compressor should be
- AAs large as possible
- BAs small as possible
- CAbout 50% of swept volume
- DAbout 100% of swept volume
11.Axial flow compressor resembles
- ACentrifugal pump
- BReciprocating pump
- CTurbine
- DSliding vane compressor
12.The ratio of work done per cycle to the swept volume in case of compressor is called
- ACompression index
- BCompression ratio
- CCompressor efficiency
- DMean effective pressure
13.The absolute pressure of air at the outlet of a compressor is called
- ABack pressure
- BCritical pressure
- CDischarge pressure
- DNone of these
14.Rotary compressor is best suited for
- ALarge quantity of air at high pressure
- BSmall quantity of air at high pressure
- CSmall quantity of air at low pressure
- DLarge quantity of air at low pressure
15.Reciprocating air compressor is best suited for
- ALarge quantity of air at high pressure
- BSmall quantity of air at high pressure
- CSmall quantity of air at low pressure
- DLarge quantity of air at low pressure
16.In a four stage compressor, if the pressure at the first and third stage is 1 bar and 16 bar, then the delivery pressure at the fourth stage will be
- A1 bar
- B16 bar
- C64 bar
- D256 bar
17.In air breathing jet engine, the jet is formed by expanding
- AHighly heated atmospheric air
- BSolids
- CLiquid
- DPlasma
18.Volumetric efficiency is
- AThe ratio of stroke volume to clearance volume
- BThe ratio of the air actually delivered to the amount of piston displacement
- CReciprocal of compression ratio
- DIndex of compressor performance
19.The blades of gas turbine are made of
- AHigh nickel alloy
- BStainless steel
- CCarbon steel
- DHigh alloy steel
20.Ramjet engine
- AIs self operating at zero flight speed
- BIs not self operating at zero flight speed
- CRequires no air for its operation
- DProduces a jet consisting of plasma