Steam and Gas Turbines Questions and Answers – Bending Stresses and Vibrations

This set of Steam and Gas Turbines Multiple Choice Questions & Answers (MCQs) focuses on “Bending Stresses and Vibration”.

1. Vibration in rotor blades causes ________________
a) resonance
b) shut down of turbine
c) resonance & shut down of turbine
d) none of the mentioned
View Answer

Answer: a
Explanation: When any particles vibrates with the same frequency as of natural frequency then it resonates.

2. Stresses are divided into ____________
a) Steady stress
b) Unsteady stress
c) Steady & Unsteady stress
d) None of the mentioned
View Answer

Answer: c
Explanation: Stresses are divided into two types. They are
Steady stresses
Unsteady stresses.

3. Stress caused due to thermal loading is classified under ______
a) Steady stress
b) Unsteady stress
c) Breakage
d) None of the mentioned
View Answer

Answer: a
Explanation: Stresses caused due to centrifugal forces, loading, thermal causing are classified into steady state stresses.
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4. Stresses caused due to centrifugal forces are classified into unsteady state stresses.
a) True
b) False
View Answer

Answer: b
Explanation: Stresses caused due to centrifugal forces are classified into steady stresses.

5. Unsteady stresses are caused due to interaction of rotating blades with ___________
a) Stationary feature
b) Viscous force
c) Friction
d) None of the mentioned
View Answer

Answer: a
Explanation: Unsteady stresses are caused due to interaction of rotating blade with stationary features.
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6. When working temperature is increased its rupture stress is ___________
a) Increased
b) Decreased
c) Working temperature is not related with rupture stress
d) None of the mentioned
View Answer

Answer: b
Explanation: Increase in working temperature is associated with decrease in rupture stress.

7. In general, there are ______ types of stresses.
a) 2
b) 4
c) 3
d) None of the mentioned
View Answer

Answer: c
Explanation: Stresses are classified into three types. They are
centrifugal stress
gas bending stress
centrifugal bending stress.
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8. Centrifugal stress is a ________
a) shear stress
b) tensile stress
c) lateral stress
d) none of the mentioned
View Answer

Answer: b
Explanation: Centrifugal stress is a tensile stress.

9. Centrifugal stress depends upon __________
a) Hub to tip ratio
b) Blade rotating speed
c) Hub to tip ratio & Blade rotating speed
d) None of the mentioned
View Answer

Answer: c
Explanation: Centrifugal stress depends upon
blade density
hub to tip ratio
blade tip speed.
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10. Centrifugal stress depends upon blade density.
a) True
b) False
View Answer

Answer: a
Explanation: Centrifugal stresses depends upon
blade density
hub to tip ration
blade tip speed.

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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