This set of Steam and Gas Turbines Multiple Choice Questions & Answers (MCQs) focuses on “Centrifugal Compressor”.
1. Centrifugal compressors are also known as ____________
a) turbo compressors
b) radial compressors
c) turbo & radial compressors
d) none of the mentioned
View Answer
Explanation: Centrifugal compressors sometimes called as radial compressors.
2. In idealized turbo machinery, pressure rise is done by adding _______
a) Temperature
b) Mass
c) Kinetic energy
d) None of the mentioned
View Answer
Explanation: In idealized turbo machinery the pressure rise is done by adding kinetic energy.
3. The pressure rise in impeller is _________ the rise in diffuser.
a) equal to
b) greater than
c) equal to or greater than
d) none of the mentioned
View Answer
Explanation: Not in all cases pressure rise in diffuser equals to pressure rise in impeller in some cases pressure rise in impeller will be more than that of diffuser.
4. In centrifugal compressor velocity of flow leaving the impeller is equals to _______ in many cases.
a) Speed of sound
b) Double the speed of sound
c) Triple the speed of sound
d) None of the mentioned
View Answer
Explanation: Initially the flow enters straightly into the impeller and the impeller pushes the flow inwards to spin faster and finally when the flow is leaving impeller it has almost speed of sound.
5. ________ are used as stationary compressors in steam turbines.
a) Moving vanes
b) Guide vanes
c) Moving & Guide vanes
d) None of the mentioned
View Answer
Explanation: Guide vanes are used as stationary compressors where guide vanes reduce the velocity and according to Bernoulli’s theorem when velocity is reduced its pressure is increased.
6. ________________ has large change in inlet to exit radius when compared to centrifugal compressors.
a) Axial compressors
b) Axial & Centrifugal compressors
c) Centrifugal compressors
d) None of the mentioned
View Answer
Explanation: Centrifugal compressors has large change in inlet to exit temperature when compared to axial compressor.
7. The first part in both centrifugal compressor and axial compressor are similar.
a) True
b) False
View Answer
Explanation: The first in both centrifugal compressor and axial compressor are similar.
8. Centrifugal compressor __________ the energy by increasing the radius where as centrifugal fan decreases the energy.
a) increases
b) decreases
c) both follow the same
d) none of the mentioned
View Answer
Explanation: Both centrifugal compressor and centrifugal fan are similar as both increases the energy by reducing the radius.
9. Centrifugal compressors increases the density of fluid more than ________
a) 1%
b) 3%
c) 5%
d) 7%
View Answer
Explanation: Centrifugal compressors increases the density of fluid more than 5 %.
10. Centrifugal fan has relative fluid velocities ______
a) Mach number more than 0.3
b) Mach number less than 0.1
c) Mach number less than 0.3
d) Mach number more than 0.5
View Answer
Explanation: Centrifugal fans often operate at fluid velocities less than mach number 0.3.
Sanfoundry Global Education & Learning Series – Steam and Gas Turbines.
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