Steam and Gas Turbines Multiple Choice Questions on “Fuel Systems in Gas Turbines”.
1. ________ produced can be varied by varying fuel flow.
a) Exhaust gases
b) Thrust
c) Exhaust gases & Thrust
d) None of the mentioned
Answer: c
Clarification: Thrust produced can be varied by varying fuel flow. If more amount of fuel is made to flow inside more mount of energy is produced and more amount of exhaust gases are released.
2. Thrust produced also depends upon rotor _________
a) blade surface
b) blade pitch
c) blade angle
d) none of the mentioned
Answer: b
Clarification: In helicopters thrust produced is varied by varying rotor blade pitch. If the pitch of the rotor blade is increased more thrust is produced.
3. Extra fuel supply causes compressor to _______
a) stall
b) surge
c) surge & stall
d) none of the mentioned
Answer: a
Clarification: When extra fuel is supplied limiting temperature is crossed and causes compressor stall. Compressor stall is disruption of the air flow in the compressor.
4. _______ is caused when extra fuel is supplied.
a) Surge
b) Stall
c) Surge & Stall
d) None of the mentioned
Answer: c
Clarification: Surge is caused when extra fuel is supplied. Stall is also caused when extra fuel is supplied. Surge is operational limit of compressor at which minimum limits are reached.
5. When fuel flow is _______ it causes surge.
a) fuel flow is not related to surge
b) decreased
c) increased
d) none of the mentioned
Answer: c
Clarification: When fuel flow is increased it causes surge. Surge is the operational limit of compressor at which minimum levels are reached.
6. Fuel control is present in turbofan engines.
a) True
b) False
Answer: a
Clarification: Fuel control is present in turbofan engines.
7. _______ control is present in turbojets.
a) Fuel
b) Thrust
c) Fuel & Thrust
d) None of the mentioned
Answer: d
Clarification: Fuel control is present in turbojets. If the fuel is controlled it indirectly controls the thrust produced.
8. Turboprops have ________ control unit.
a) thrust
b) fuel
c) surge
d) none of the mentioned
Answer: b
Clarification: Fuel control unit is present in turboprop. By using fuel control unit amount of thrust produced can be regulated.
9. _________ control unit is present in turboshaft engines.
a) exhaust
b) fuel
c) thrust
d) none of the mentioned
Answer:b
Clarification: Fuel control unit is present in turboshaft engines. Thrust is varied by using fuel control unit in turboshaft engines.
10. Variable displacement pump is present in fuel control units.
a) True
b) False
Answer: a
Clarification: Variable displacement pumps have variable displacements which was used to meet the fuel requirements.