250+ TOP MCQs on Hydrogen Seal Rings in Turbine Generator and Answers

Steam and Gas Turbines Multiple Choice Questions on “Hydrogen Seal Rings in Turbine Generator”.

1. Hydrogen seal rings are used to prevent _______ losses.
a) Pressure
b) Temperature
c) Volume
d) None of the mentioned
Answer: a
Clarification: Hydrogen seal rings are used to prevent pressure losses. These rings seal the cylinders so that no pressure and temperature loss takes place.

2. _________ oil flow can be controlled by using hydrogen rings.
a) Low
b) Excessive
c) Incomplete
d) None of the mentioned
Answer: b
Clarification: Hydrogen rings control excessive oil flow.Excessive oil flow consumes more heat and increases the heat loss.

3. Hydrogen rings are used to control _______ consumption in gas turbine.
a) Fuel
b) Oxygen
c) Hydrogen
d) None of the mentioned
Answer: c
Clarification: Hydrogen rings are used to control hydrogen consumption in gas turbine. Hydrogen is used as coolant in gas turbine, Excessive usage of coolant leads to low efficiency.

4. When hydrogen consumption is __________ its efficiency is decreased in turbo generators.
a) increased
b) decreased
c) constant
d) none of the mentioned
Answer: a
Clarification: Hydrogen consumption is inversely proportional to efficiency in turbo generators. As hydrogen is used as the coolant and when more amount of coolant is used most heat is lost and hence efficiency is decreased.

5. _________ is used as coolant in turbo generators.
a) Oxygen
b) Hydrogen
c) Fuel
d) None of the mentioned
Answer: b
Clarification: Hydrogen is used as coolant in turbo generators. Compared to the other coolants available for gas turbines hydrogen is much cheaper.

6. Hydrogen is combustible below _______% purity limit.
a) 74
b) 50
c) 100
d) 120
Answer: a
Clarification: Hydrogen is combustible below 74% purity limit.

7. Hydrogen rings are made at _____ degree segments.
a) 360
b) 90
c) 180
d) 60
Answer: c
Clarification: Hydrogen rings are made at 180 degree segments. The total ring circumference must be 360 degree comprising two parts ( i.e Hydrogen rings) each of 180 degree.

8. Hydrogen rings are of two parts upper case and lower case.
a) True
b) False
Answer: a
Clarification: Hydrogen rings are of two parts upper case and lower case.

9. Hydrogen is used because of its ______ specific heat.
a) high
b) low
c) specific is not the factor considered while selecting
d) none of the mentioned
Answer: b
Clarification: Hydrogen is used because of its low specific heat.

10. For hydrogen to use as coolant its purity must be more than _______
a) 74%
b) 50%
c) 100%
d) 40%
Answer: a
Clarification: For hydrogen to use as coolant its purity must be more than 74%. Below 74% hydrogen is more combustible in nature.