Steam and Gas Turbines Questions and Answers – Critical Pressure Ratio

This set of Steam and Gas Turbines Multiple Choice Questions & Answers (MCQs) focuses on “Critical Pressure Ratio”.

1. Pressure ratios below 20 are used in _____________ engines.
a) steam turbine
b) aero derivative engines
c) heavy frame engines
d) none of the mentioned
View Answer

Answer: c
Explanation: Lower pressure ratios are maintained in heavy frame engines.

2. Heavy frame engines are physically ___________
a) medium
b) large
c) small
d) none of the mentioned
View Answer

Answer: b
Explanation: Heavy frame engines are physically large.

3. Aeroderivative engines have pressure ratios ___________
a) greater than 30
b) lesser than 30 and greater than 20
c) greater than 50
d) none of the mentioned
View Answer

Answer: a
Explanation: Higher pressure ratios of greater than 30 are used in aeroderivative engines.
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4. Aeroderivative engines are used where ____________ power units are required.
a) larger
b) smaller
c) optimum
d) none of the mentioned
View Answer

Answer: b
Explanation: Aeroderivative engines are used where smaller power units are required.

5. Aeroderivative engines are larger.
a) True
b) False
View Answer

Answer: b
Explanation: Aeroderivative engines are compact and smaller in size.
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6. Aeroderivative engines release higher emissions.
a) True
b) False
View Answer

Answer: a
Explanation: Aeroderivative engines are smaller and produce high output as a result of which they release higher emissions.

7. Gas turbines operate at pressures ________ than critical pressure ratio.
a) higher
b) lesser
c) does not depend on pressure ratio
d) none of the mentioned
View Answer

Answer: b
Explanation: Gas turbines operate at pressures less than critical pressure ratio.
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8. Critical pressure ratio is ratios of pressures at _________ discharge.
a) minimum
b) none of the mentioned
c) optimum
d) maximum
View Answer

Answer: d
Explanation: Critical pressure ratio is the ratios of pressure at maximum discharge.

9. Ratio of critical pressure to inlet pressure in known as ___________
a) none of the mentioned
b) pressure ratio
c) critical pressure ratio
d) isoentropic pressure ratio
View Answer

Answer: c
Explanation: Ratio of critical pressure to inlet pressure is called as critical pressure ratio.
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10. In De Laval Nozzle critical pressure ratio is given by (2/y+1)^(y/y-1).
a) True
b) False
View Answer

Answer: a
Explanation: Critical pressure ratio of De Laval nozzle is derived theoretically.

Sanfoundry Global Education & Learning Series – Steam and Gas Turbines.

To practice all areas of Steam and Gas Turbines, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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