Steam and Gas Turbines Questions and Answers – Energy Distribution and Effect of Carry-Over Velocity

This set of Steam and Gas Turbines Multiple Choice Questions & Answers (MCQs) focuses on “Energy Distribution and Effect of Carry Over Velocity”.

1. Most of the energy produced by gas turbine is utilized by _______
a) compressor
b) condenser
c) to drive turbine blade
d) none of the mentioned
View Answer

Answer: a
Explanation: Two third of the energy produced by gas turbine is utilized by the compressor to compress the air.

2. In gas turbines during expansion rotor’s blades rotate, which is an __________ transformation.
a) reversible
b) irreversible
c) no energy transformation occurs by rotation of rotor blades
d) none of the mentioned
View Answer

Answer: b
Explanation: Rotation of rotor blades is an irreversible transformation.

3. Energy losses in gas turbines are __________
a) flue gasses energy loss
b) rotational loss
c) flue gasses energy & rotational loss
d) none of the mentioned
View Answer

Answer: c
Explanation: Flue gases loss and rotational loss are some of the energy losses in gas turbine.
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4. In steam turbines carry over losses are due to _____________
a) formation of eddies in annular spaces
b) decrease in pressure
c) increase in temperature
d) none of the mentioned
View Answer

Answer: a
Explanation: Carry over losses are due to formation of eddies in steam turbines.

5. Corrosion and Erosion takes place if dryness factor of steam is __________ in last stage.
a) less than 0.68
b) more than 0.60
c) less than 0.88
d) none of the mentioned
View Answer

Answer: c
Explanation: Liquid particles have lesser velocity than steam particles and hence if dryness fraction is less than 0.88 even erosion and corrosion can takes place.
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6. Radiation losses can be covered by _______
a) decreasing the temperature of steam
b) proper insulation
c) decreasing the temperature of steam and proper insulation
d) none of the mentioned
View Answer

Answer: b
Explanation: Radiation and convention losses can be reduced by proper insulation.

7. Enthalpy __________ takes place when steam enters from turbine to condenser.
a) decrease
b) increase
c) depends on the situation
d) none of the mentioned
View Answer

Answer: a
Explanation: When steam leaving turbine has kinetic energy and when it enters condenser enthalpy loss takes place.
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8. Energy balance states that total energy input is equal to arithmetic sum of Energy losses, output work, flue gasses loss and rotational loss.
a) True
b) False
View Answer

Answer: a
Explanation: Energy balance equation states that
Total energy input = Energy output + energy losses + flue gasses loss + rotational loss.

9. ______________ is commonly called as carry over velocity.
a) Compressor velocity
b) Inlet velocity
c) Exit velocity
d) None of the mentioned
View Answer

Answer: c
Explanation: Velocity at exit is called carryover velocity.
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10. Carryover loss is also called a leaving loss.
a) True
b) False
View Answer

Answer: a
Explanation: Loss in exit velocity is called carryover loss or leaving loss.

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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