This set of Steam and Gas Turbines Multiple Choice Questions & Answers (MCQs) focuses on “Surging”.
1. A back flow from discharge to suction in compressor is called as __________
a) Pitching
b) Yawning
c) Surging
d) None of the mentioned
View Answer
Explanation: Back flow of working fluid from discharge section to suction in compressor is called as surging.
2. Surging occurs when mass flow crosses ________
a) critical value
b) peak pressure
c) below critical value
d) none of the mentioned
View Answer
Explanation: Surging occurs when mass flow falls below the critical value.
3. Surging occurs when pressure difference is ________
a) high
b) low
c) medium
d) none of the mentioned
View Answer
Explanation: When surging is occurred high pressure difference is established.
4. Surging _________ the speed of rotation.
a) increases
b) decreases
c) remains constant
d) none of the mentioned
View Answer
Explanation: Surging decreases the speed of the rotation.
5. Surging produces _______ vibrations.
a) heavy
b) little
c) medium range
d) none of the mentioned
View Answer
Explanation: Surging produces heavy vibrations due to forward and backward flow of fluid.
6. Surging effects the working of __________
a) compressor
b) turbine
c) surging
d) none of the mentioned
View Answer
Explanation: Surging effects working of compressor.
7. Surging also damages pipelines.
a) True
b) False
View Answer
Explanation: Surging damages the pipelines due to vibration produced.
8. Due to surging when pressure changes_________ turbine shuts down.
a) very high
b) very low
c) to zero
d) none of the mentioned
View Answer
Explanation: Due to surging when the pressure drops very low turbine may shut down.
9. Surging only ________ the speed.
a) increases
b) increases & decreases
c) decreases
d) none of the mentioned
View Answer
Explanation: Surging not only reduces the speed sometimes it leads to overspeed.
10. Surging can be prevented by anti surge systems and control valve.
a) True
b) False
View Answer
Explanation: Surging can be prevented by anti surge systems and control valve.
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