Compressors, Gas Dynamics and Gas Turbines MCQs
Compressors, Gas Dynamics and Gas Turbines MCQs
Try to answer these 20 Compressors, Gas Dynamics and Gas Turbines MCQs and Answers (FREE) MCQs and check your understanding of the Compressors, Gas Dynamics and Gas Turbines MCQs and Answers (FREE) subject.
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1: In axial flow compressor, exit flow angle deviation from the blade angle is a function of
A. Blade camber and incidence angle
B. Space-chord ratio
C. Blade camber and space-chord ratio
D. Blade camber
2: The increase in pressure in a roots blower is entirely due to back flow of air.
A. Disagree
B. Agree
3: A large clearance Volume in a reciprocating compressor results in
A. Increased volume flow rate
B. Lower delivery pressure
C. Lower suction pressure
D. Reduced volume flow rate
4: The actual volume of air delivered by a compressor, When reduced to the normal temperature and pressure conditions is called compressor capacity.
A. No
B. Yes
5: The capacity of a compressor is expressed in
A. M3/min
B. Kg/m2
C. M3/kg
D. Kg/m3
6: The stagnation pressure rise in a centrifugal compressor takes place
A. In the impeller only
B. In the inlet guide vanes only
C. In the diffuser and impeller
D. In the diffuser only
7: The compression ratio in a gas turbine is
A. 9
B. 4
C. 12
D. 1
8: The total heat rejected in a reciprocating air compressor is equal to the sum of the heat rejected during polytropic compression per kg of air and heat rejected in the intercooler per kg of air.
A. False
B. True
9: The type of rotary compressor used in gas turbines, is of
A. Axial flow type
B. Radial flow type
C. Centrifugal type
D. None of these
10: Which of the following statement is wrong?
A. The ratio of the volume of free air delivery per stroke to the swept volume of the piston is called volumetric efficiency.
B. The minimum work required for a two stage reciprocating air compressor is double the work required for each stage.
C. In a two stage reciprocating air compressor with complete intercooling, maximum work is saved.
D. None of these
11: The rotary compressors are suitable for large discharge of air at low pressure.
A. False
B. True
12: When the temperature of air leaving the intercooler, in a two stage compression with intercooler, is __________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.
A. More than
B. Equal to
C. Less than
13: Gas turbine as compared to steam turbine
A. Requires less space for installation
B. Has less efficiency
C. Has compressor and combustion chamber
D. All of these
14: In a reciprocating air compressor, the compression work per kg of air
A. Increases as clearance volume increases
B. Is independent of clearance volume
C. Increases as clearance volume decreases
D. Decreases as clearance volume increases
15: An open cycle gas turbine works on the same cycle as that of a closed cycle gas turbine.
A. No
B. Yes
16: Rotary compressors are used for delivering
A. Small quantities of air at high pressures
B. Small quantities of air at low pressures
C. Large quantities of air at high pressures
D. Large quantities of air at low pressures
17: Which of the following statement is correct?
A. The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency.
B. The compression ratio for the compressor is always greater than unity.
C. The compressor capacity is the ratio of workdone per cycle to the stroke volume.
D. During isothermal compression of air, the workdone in a compressor is maximum.
18: The maximum temperature in a gas turbine is
A. 500°C
B. 200°C
C. 700°C
D. 1000°C
19: Intercooling in gas turbines
A. Decreases net output and thermal efficiency both
B. Increases net output and thermal efficiency both
C. Increases net output but decreases thermal efficiency
D. Decreases net output but increases thermal efficiency
20: A rocket works with maximum overall efficiency when air-craft velocity is __________ the jet velocity.
A. Equal to
B. One-half
C. Double
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