1) The mass flow rate of air compressed in axial flow compressor is _____________centrifugal compressor.
a. lower than
b. higher than
c. same as
d. unpredictable
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Answer
Explanation
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ANSWER: higher than
Explanation:
No explanation is available for this question!
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2) Which of the following is NOT a type of rotary compressor?
a. Positive displacement type of compressor
b. Steady flow compressor
c. Both a. and b.
d. None of the above
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Answer
Explanation
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ANSWER: None of the above
Explanation:
No explanation is available for this question!
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3) Which compressors are suitable for large volume flow rates of above 1200 m3/min
a. Centrifugal compressors
b. Axial flow compressors
c. Both a. and b.
d. None of the above
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Answer
Explanation
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ANSWER: Axial flow compressors
Explanation:
No explanation is available for this question!
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4) The function of _________ is to convert high kinetic energy of gases into pressure energy.
a. impeller
b. diffuser
c. casing
d. None of the above
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Answer
Explanation
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ANSWER: diffuser
Explanation:
No explanation is available for this question!
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5) How is the variation of air velocity while passing through impeller followed by diffuser in centrifugal compressor?
a. Air velocity goes no increasing in impeller followed by diffuser
b. Air velocity goes no decreasing in impeller followed by diffuser
c. Air velocity increases in impeller and then decreases in diffuser
d. Air velocity decreases in impeller and then increases in diffuser
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Answer
Explanation
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ANSWER: Air velocity increases in impeller and then decreases in diffuser
Explanation:
No explanation is available for this question!
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6) Angular momentum of gas in the free vortex of vaneless diffuser ___________.
a. increases
b. decreases
c. remains constant
d. becomes unpredictable
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Answer
Explanation
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ANSWER: remains constant
Explanation:
No explanation is available for this question!
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7) Vaneless diffusers are suitable for ___________.
a. only low pressure rise
b. only high pressure rise
c. both low as well as high pressure rise
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Answer
Explanation
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ANSWER: only low pressure rise
Explanation:
No explanation is available for this question!
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8) The diffuser blades are kept ______ the number of impeller blades .
a. 1/10 th of
b. 1/3 rd of
c. 10 times
d. 3 times
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Answer
Explanation
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ANSWER: 1/3 rd of
Explanation:
No explanation is available for this question!
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9) The ratio of actual whirl velocity to the ideal whirl velocity in the centrifugal compressor is called as _________.
a. velocity factor
b. slip factor
c. work factor
d. none of the above
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Answer
Explanation
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ANSWER: slip factor
Explanation:
No explanation is available for this question!
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10) What is the ratio of isentropic work to Euler work in an centrifugal compressor called?
a. Work coefficient
b. Velocity coefficient
c. Pressure coefficient
d. Flow coefficient
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Answer
Explanation
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ANSWER: Pressure coefficient
Explanation:
No explanation is available for this question!
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