Steam and Gas Turbines Questions and Answers – Turbine Rotor and Blade Stresses

This set of tough Steam and Gas Turbines questions and answers focuses on “Turbine Rotor and Blade Stresses”.

1. Thermal stresses in rotor is ___________ than in cylinder.
a) lesser
b) greater
c) equal
d) none
View Answer

Answer: b
Explanation: Pressure and Temperature are higher in high pressure cylinders and hence thermal stress in rotor is higher than that in cylinder.

2. Crank Nicholson method is an integration method.
a) True
b) False
View Answer

Answer: a
Explanation: Crank Nicholson method is an integration method.

3. Westinghouse formula is used to calculate ____________ formula.
a) heat transfer
b) efficiency
c) heat transfer & efficiency
d) none of the mentioned
View Answer

Answer: c
Explanation: Westinghouse formula is used to calculate heat transfer formula where heat transfer is to be found in third dimension.
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4. Nagong-Haqi formula is used to calculate ___________ formula.
a) heat transfer
b) efficiency
c) heat transfer & efficiency
d) none of the mentioned
View Answer

Answer: a
Explanation: Both westinghouse formula and nagong-haqi formula are used to calculate heat transfer formula.

5. Stress in the rotor is influenced by ______
a) Pressure
b) Temperature
c) Force
d) None of the mentioned
View Answer

Answer: b
Explanation: Stress in rotor is influenced by temperature field.
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6. When pulling stress and mechanical stress in same direction _______
a) Turbine efficiency decreases
b) Turbine shutdowns
c) Turbine slows down
d) None of the mentioned
View Answer

Answer: d
Explanation: When pulling stress and mechanical stress in same direction, turbine shutdowns.

7. Turbine blades are subjected to stress from ___________
a) centripetal force
b) centrifugal force
c) centripetal & centrifugal force
d) none of the mentioned
View Answer

Answer: b
Explanation: Turbine blades are subjected to stress from centrifugal forces.
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8. Turbine blades are conventionally casted.
a) True
b) False
View Answer

Answer: a
Explanation: Turbine blades can be conventionally casted.

9. In atomic scale shear stress varies ___________
a) tangentially & sinusoidally
b) tangentially
c) sinusoidally
d) none of the mentioned
View Answer

Answer: c
Explanation: When shear stress in noted in atomic scale is varies sinusoidally.
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10. Ductility increases with ____________ in temperature.
a) Increase
b) Decrease
c) Ductility doesn’t effect with temperature
d) None of the mentioned
View Answer

Answer: a
Explanation: Ductility increases with an increase in temperature.

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

To practice tough questions on 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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