Steam and Gas Turbines Multiple Choice Questions on “Torque Characteristics”.
1. Torque speed characteristics of _______ shaft gas turbine is same as that of dual shaft gas turbine.
a) single
b) multiple
c) double
d) none of the mentioned
Answer: a
Clarification: Torque speed characteristics of single shaft gas turbine is different from the dual shaft gas turbine.
2. In single shaft gas turbine when torque output is 50% engine speed is about _______
a) 50%
b) 80%
c) 90%
d) 100%
Answer: b
Clarification: In a single shaft gas turbine when the engine speed is about 80% the torque is about 50%.
3. In a single shaft gas turbine when the engine speed is about 100% the torque output is ______
a) 40%
b) 50%
c) 80%
d) 100%
Answer: d
Clarification: In a single shaft gas turbine when the engine speed is about 100% the torque output is 100%.
4. In a single shaft gas turbine output shaft is connected to a ________ speed compressor.
a) high
b) low
c) medium
d) none of the mentioned
Answer: a
Clarification: In a single shaft gas turbine output shaft is connected to a high speed compressor.
5. Stability of the rotation in gas turbine compressor is due to ______ inertia.
a) low
b) high
c) medium
d) none of the mentioned
Answer: b
Clarification: Stability of the rotation in gas turbine compressor is due to high inertia.
6. In a dual shaft gas turbine when the speed is about 60% the torque is increased to _______
a) 100%
b) 90%
c) 140%
d) 120%
Answer: c
Clarification: In a double shaft gas turbine when the speed is about 60% the torque is increased to 140%. These values are found from torque and speed curve.
7. In dual shaft gas turbine when the engine speed is 40%, the engine torque is reduced to _________
a) 90%
b) 160%
c) 100%
d) 80%
Answer: b
Clarification: In a dual shaft gas turbine when the engine speed is 40% the torque is increased to 160%. These values are found from graph plotted between torque and speed.
8. Engine output is the ratio of __________ and torque.
a) speed
b) displacement
c) input
d) none of the mentioned
Answer: a
Clarification: Product of speed and torque is known as engine output.
9. At low speeds the output is __________ in dual shaft gas turbine.
a) low
b) medium
c) high
d) none of the mentioned
Answer: c
Clarification: At low speeds the outputs of dual shaft gas turbines are high.
10. In diesel engines engine output increases when engine speed decreases.
a) True
b) False
Answer: b
Clarification: In diesel engines engine output decreases with the decrease in the engine speed.