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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.In a jet propulsion
- AThe propulsive matter is ejected from within the propelled body
- BThe propulsive matter is caused to flow around the propelled body
- CIts functioning does not depend upon presence of air
- DNone of the above
2.The maximum temperature in a gas turbine is
- A200°C
- B500°C
- C700°C
- D1000°C
3.Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is
- AHigher
- BLower
- CEqual
- DCan't be compared
4.The hottest point in a gas turbine is
- Aat the base
- Bat the tip
- Cin the center
- Dbetween ~ to i of the blade height
5.The compression ratio for the compressor is always _________ unity.
- AEqual to
- BLess than
- CMore than
- DNone of these
6.The ideal efficiency of simple gas turbine cycle depends on
- APressure ratio
- BMaximum cycle temperature
- CMinimum cycle temperature
- DAll of the above
7.There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would
- ARemain same
- BDecrease
- CIncrease
- DNone of the above
8.Ratio of indicated h.p. to shaft h.p. in known as
- ACompressor efficiency
- BIsothermal efficiency
- CVolumetric efficiency
- DMechanical efficiency
9.Ratio of indicated H.P. and brake H.P. is known as
- AMechanical efficiency
- BVolumetric efficiency
- CIsothermal efficiency
- DAdiabatic efficiency
10.The output of a gas turbine is 300 KW and its efficiency is 20 percent, the heat supplied is
- A6000 KW
- B15 KW
- C600 KW
- D150 KW
11.The fuel consumption in gas turbines is accounted for by
- ALower heating value
- BHigher heating value
- CHeating value
- DHigher calorific value
12.The indicated work per unit mass of air delivered is
- ADirectly proportional to clearance volume
- BGreatly affected by clearance volume
- CNot affected by clearance volume
- DInversely proportional to clearance volume
13.Which of the following plants is smallest and lightest for generating a given amount of power?
- AGas turbine plant
- BPetrol engine
- CDiesel engine
- DSolar plant
14.In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of
- AVacuum
- BAtmospheric air
- CCompressed air
- DOxygen alone
15.Gas turbine blades are given a rake
- AEqual to zero
- BIn the direction of motion of blades
- COpposite to the direction of motion of blades
- DDepending on the velocity
16.Reheating in a gas turbine
- AIncreases the thermal efficiency
- BIncreases the compressor work
- CIncreases the turbine work
- DDecreases the thermal efficiency
17.In axial flow compressor, exit flow angle deviation from the blade angle is a function of
- ABlade camber
- BBlade camber and incidence angle
- CSpace-chord ratio
- DBlade camber and space-chord ratio
18.The air power of the compressor is also known as
- AIndicated power
- BBrake power
- CFrictional power
- DNone of these
19.To avoid moisture troubles, the compressed air main line should
- ARise gradually towards the point of use
- BDrop gradually towards the point of use
- CBe laid vertically
- DBe laid exactly horizontally
20.The ratio of the discharge pressure to the inlet pressure of air is called
- ACompression ratio
- BExpansion ratio
- CCompressor efficiency
- DVolumetric efficiency