Steam and Gas Turbines Multiple Choice Questions on “Usage of Cryogenics in Gas Turbines”.
1. In cryogenic rocket engines use oxidizer as fuel.
a) True
b) False
Answer: a
Clarification: In cryogenic rocket engines use oxidizer as fuel.
2. Cryogenic fuels are stored under _______ temperatures.
a) high
b) low
c) medium
d) none of the mentioned
Answer: b
Clarification: Cryogenic rocket fuels are stored under low temperatures. Cryogenics works under minus degree Celsius and hence they are stored in low temperatures.
3. Rocket engines require _______ mass flow rate.
a) high
b) low
c) medium
d) none of the mentioned
Answer: a
Clarification: Rocket engines require high mass flow rate. Rocket engines requires high thrust and for producing high thrust high mass flow rate is required.
4. Rocket fuels has ________ molecular weight.
a) medium
b) high
c) low
d) none of the mentioned
Answer: c
Clarification: Rocket fuels has low molecular weight.
5. Cryogenic fuels are in _________ state at room temperature and pressure.
a) gaseous
b) liquid
c) solid
d) none of the mentioned
Answer: a
Clarification: Cryogenic fuels are in a gaseous state at room temperature and pressure. Cryogenics work under low temperatures and when temperature is changed to room temperature then phase transfer takes place.
6. Cryogenic rocket engines are also called as hybrid rocket engines.
a) True
b) False
Answer: a
Clarification: Cryogenic rocket engines are also called as hybrid rocket engines.
7. Hybrid rocket engines are also called as ________ propellant rocket engines.
a) solid
b) liquid
c) solid & liquid
d) none of the mentioned
Answer: b
Clarification: Hybrid rocket engines are also called as liquid propellant rocket engines. Because fuels used in hybrid engines are in liquid state.
8. ____________ is used as cryogenic fuel.
a) Liquid oxygen
b) Liquid hydrogen
c) Combination of liquid oxygen and liquid hydrogen
d) None of the mentioned
Answer: a
Clarification: Combination of both liquid oxygen and liquid hydrogen are used as cryogenic fuel. Mixture of this liquid oxygen and liquid hydrogen results in low temperature which is a main property of cryogenic fuels.
9. Liquid hydrogen and oxygen mixture produces thrust upto ________
a) 5 Km/s
b) 4 Km/s
c) 4.5 Km/s
d) 5.5 Km/s
Answer: c
Clarification: Liquid hydrogen and oxygen mixture produces thrust upto 4.5 Km/s. Cryogenic fuels produce high thrust force.
10. _________ initiators are used in cryogenic rocket engines.
a) Pyrotechnic
b) Centrifugal
c) Pyrotechnic & Centrifugal
d) None of the mentioned
Answer: a
Clarification: Pyrotechnic initiators are used in cryogenic rocket engines.