Gas Turbines Questions and Answers – Combustion System in Gas Turbines

This set of Steam and Gas Turbines Multiple Choice Questions & Answers (MCQs) focuses on “Combustion System in Gas Turbines”.

1. After burners are used to ________ the thrust.
a) increase
b) decrease
c) afterburners are not related to thrust
d) none of the mentioned
View Answer

Answer: a
Explanation: After burners are used to increase the thrust. After burners collect the exhaust gases from exhaust frame and reheat them and uses the remaining kinetic energy of the gases and increases the thrust produced.

2. Extra fuel is injected to afterburners to _________ the thrust.
a) decrease
b) increase
c) extra fuel is not injected
d) none of the mentioned
View Answer

Answer: b
Explanation: Extra fuel is injected to afterburners to increase the thrust. All the exhaust gases from exhaust frame is brought into afterburners and burned again with the help of extra fuel added into afterburner.

3. Afterburners consume _______ fuel amounts.
a) medium
b) low
c) high
d) none of the mentioned
View Answer

Answer: c
Explanation: Afterburners consume high fuel amounts. For exhaust gases left after combustion from combustion chamber extra amount of fuel is added to the afterburner to burn again so that the remaining traces of fuel in exhaust gases get burned.
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4. By using afterburners efficiency is _________
a) increased
b) decreased
c) not effected
d) none of the mentioned
View Answer

Answer: b
Explanation: By using afterburners efficiency is decreased. As more amount of fuel is required in after burners.

5. When jet engines use afterburners engines are ________
a) wet
b) dry
c) semi dry
d) none of the mentioned
View Answer

Answer: a
Explanation: When jet engines use afterburners engines are wet. For working of afterburners a continuous supply of fuel need to be given and hence they are wet.

6. When afterburners are not used in jet engines they are ________
a) wet
b) dry
c) semi dry
d) none of the mentioned
View Answer

Answer: b
Explanation: When afterburners are not used in jet engines they are dry. Exhaust gases are dry which makes jet engine dry.

7. Afterburners are not equipped with case and liners.
a) True
b) False
View Answer

Answer: b
Explanation: After burners are equipped with both case and liners.
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8. Afterburners have _______ rise in temperature than combustors.
a) low
b) equal
c) high
d) none of the mentioned
View Answer

Answer: c
Explanation: Afterburners have high rise in temperature when compared to combustors. As already the exhaust gases are present in high temperatures and when again burned by adding some fuel the exhaust gases that are released from afterburners that have high temperatures.

9. Mixing of fuel takes place efficiently in afterburners.
a) True
b) False
View Answer

Answer: b
Explanation: Mixing of fuel is not that efficient in afterburners.
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10. Afterburners require _________
a) flame holder
b) nozzle
c) casing
d) none of the mentioned
View Answer

Answer: a
Explanation: Flame holders are used to maintain a constant velocity of flame. If the flame in afterburners are produced with different velocities combustion of the flame may not be constant.

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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