Advanced Gas Turbines Questions & Answers on “Micro Gas Turbines”.
1. _________ jets produce micro gas turbines.
a) Bladon
b) Turbo
c) Bladon & Turbo
d) None of the mentioned
Answer: a
Clarification: Bladon jets produce micro gas turbines. Due to the weight to size constraint these are used.
2. Hybrid electric vehicles are powered by _________
a) turbo shafts
b) micro gas turbines
c) turbo jets
d) none of the mentioned
Answer: b
Clarification: Hybrid electric vehicles are powered by micro gas turbines. Micro gas turbines are used by considering weight to size ratio.
3. Micro turbines are based on _________
a) weight
b) size
c) micro combustion
d) none of the mentioned
Answer: c
Clarification: Micro combustion is the basic principle micro turbines are based upon.
4. In micro turbines generator is integrated with _________
a) turbine shaft
b) combustor
c) turbine shaft & combustor
d) none of the mentioned
Answer: a
Clarification: In micro turbines generator is integrated with turbine shaft.
5. Micro turbines have ________ power to weight ratio.
a) constant
b) low
c) high
d) none of the mentioned
Answer: c
Clarification: Micro turbines have high power to weight ratio. As the weight of the micro gas turbines is less it automatically increases the ratio.
6. Micro turbines have ________ emissions.
a) high
b) low
c) medium
d) none of the mentioned
Answer: b
Clarification: Micro turbines have low emissions. As power to weight ratio is less for micro turbines emissions are also reduced in micro gas turbines.
7. Micro turbines are more efficient at ________ power level when compared to reciprocating engines.
a) high
b) low
c) medium
d) none of the mentioned
Answer: b
Clarification: Micro turbines are more efficient at low power levels when compared to reciprocating engines. As the size of micro gas turbines is less the total power produced is also less when compared to reciprocating engines.
8. Micro turbines use _______ bearings.
a) air & journal
b) journal
c) air
d) none of the mentioned
Answer:c
Clarification: Micro turbines use air bearings. As journal bearings are huge in size when compared to air bearings and weight of air bearings is also less.
9. Micro turbines can also use magnetic bearings.
a) True
b) False
Answer: a
Clarification: High temperatures and high speed of micro turbines make usage of ball bearings impractical and so micro turbines can be used with air bearings or magnetic bearings.
10. Throttling of the fuel in gas turbines is impractical.
a) True
b) False
Answer: a
Clarification: Battery is used as a buffer in micro turbines for storing electricity and hence throttling is not required in micro turbines.
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