This set of Steam and Gas Turbines Multiple Choice Questions & Answers (MCQs) focuses on “Advantages”.
1. High power density is the advantage obtained from _______
a) solar Gas turbines
b) steam Turbines
c) cryogenic Gas turbines
d) none of the mentioned
View Answer
Explanation: Gas turbines have higher power density than steam turbines and in the case of cryogenic gas turbines those could not be operated on solar power.
2. High power to weight ratio is the advantage of _______
a) Turboprop
b) Turbofan
c) Turbojet
d) All of the mentioned
View Answer
Explanation: All the turboprop, Turbofan, Turbojet have high power to weight ratio when compared to internal combustion engines. That is the reason behind using those gas turbines in place of internal combustion engines in aircrafts.
3. Gas turbine powered engines are smaller than reciprocating engines.
a) True
b) False
View Answer
Explanation: In gas turbines high power to weight ratio is obtained when compared to reciprocating engines which indicates that for producing equal power in both gas turbine engine and reciprocating engine weight of gas turbine engine should be less which indicates that gas turbine engines are smaller when compared to reciprocating engine.
4. Gas turbine engines moves only in _______ direction.
a) multi
b) two
c) one
d) none
View Answer
Explanation: In gas turbines turbine rotates due to combusted gases. Combusted gases flow only in one direction, so gas turbine engine moves in one direction only.
5. Gas turbine engines have ______ vibrations when compared to reciprocating engines.
a) less
b) more
c) equal
d) none
View Answer
Explanation: Gas turbine engines have less rotating parts when compared to reciprocating engines and so gas turbine engines have less vibrations when compared to reciprocating engines.
6. Gas turbine engines have low operating pressures when compared to reciprocating engines.
a) True
b) False
View Answer
Explanation: In gas turbine engines hot gases from combustors rotate the turbine which means there is separate combustor available in gas turbines where combustion takes place and high temperatures are obtained but turbine does not have high pressure but in the case of reciprocating engines combustion chamber and piston is in the same cylinder, so high pressure is obtained.
7. High operating speeds are obtained in _______
a) Reciprocating turbines
b) Gas turbines
c) Stirling engine
d) None of the mentioned
View Answer
Explanation: In gas turbines high rpm and low torques are obtained.
8. Consumption of lubricating oil is _______ in gas turbines.
a) low
b) high
c) medium
d) none
View Answer
Explanation: In reciprocating engines pistons are used but not in the case of gas turbines. Hence low lubrication oil is required.
9. At idle conditions gas turbine engines are ________ efficient than reciprocating engines.
a) more
b) less
c) moderately
d) none
View Answer
Explanation: In gas turbines two thirds of total energy produced is used in by compressor where as reciprocating engines have no compressor. So gas turbines use more power than reciprocating engines at idle conditions.
10. Reciprocating engines require __________ startups than Gas turbines.
a) longer
b) moderate
c) shorter
d) none
View Answer
Explanation: Initially for reciprocating engines to start only combustion process need to be started but in the case of Gas turbines both compressor and combustor need to start. So Gas turbines take longer startups when compared to reciprocating engines.
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