Power Plant Questions and Answers – Combined Cycle Plants, Nuclear and Thermionic Power Generation

This set of Power Plant Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Combined Cycle Plants, Nuclear and Thermionic Power Generation”.

1. The maximum steam temperature in a power cycle in degree centigrade is?
a) 600
b) 500
c) 300
d) 100
View Answer

Answer: a
Explanation: The maximum steam temperature in a power cycle is 600 degree centigrade.

2. The temperature in a dry bottom pulverised coal furnace, in degree Celsius is about?
a) 1200
b) 1300
c) 1400
d) 2000
View Answer

Answer: b
Explanation: The temperature in a dry bottom pulverised coal furnace, in degree Celsius is about 1300.

3. What happens to the availability in a combined cycle plant?
a) decreases
b) increases
c) remains same
d) cannot say
View Answer

Answer: a
Explanation: There is a great thermal irreversibility & a decrease of availability because of heat transfer from combustion gases to steam through such a large temperature difference.
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4. By superposing a high temperature power plant as a topping unit to the steam plant, the energy conversion efficiency achieved is?
a) higher
b) lower
c) maximum
d) minimum
View Answer

Answer: a
Explanation: By superposing a high temperature power plant as a topping unit to the steam plant, the energy conversion efficiency achieved is higher from fuel to electricity.

5. Which of the following is not a type of Combined Plant?
a) Sodium- mercury-Potassium plant
b) Gas turbine-Steam turbine plant
c) Thermionic steam plant
d) Thermoelectric steam plant
View Answer

Answer: a
Explanation: Sodium-mercury-potassium plants have two topping fluids which is impossible for a plant to possess.
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6. Which of these is not a component of nuclear reactor?
a) reactor core
b) refractor
c) control rod
d) biological shield
View Answer

Answer: b
Explanation: A reflector rather than a refractor is a component of nuclear reactor.

7. Which of these is not a merit of nuclear power?
a) amount of fuel required is small
b) plant requires a huge amount of area
c) demand for coal and oil is reduced
d) most economical in large quantities
View Answer

Answer: b
Explanation: A small amount of area is required.

8. The thermionic generator is essentially which kind of device?
a) low voltage & high current
b) high voltage & high current
c) low voltage & low current
d) high voltage and high current
View Answer

Answer: a
Explanation: Thermionic generator is essentially a low-voltage & high-current device.

9. What efficiencies of thermionic power generator have been realised?
a) 50-60%
b) 40-50%
c) 10-20%
d) 30-40%
View Answer

Answer: c
Explanation: Efficiency of 30-40% has been realised in thermionic generators.
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10. The maximum electron current per unit area provided by an emitter is given by (where J = current density, T = absolute temperature in K, ɸ = work function in keV, k = Boltzmann’s constant & A=emission constant)
a) J = AT exp(-ɸ/kT)
b) J = AT (-ɸ/kT)
c) J = AT2 exp(-ɸ/kT)
d) J = exp(-Aɸ/kT2)
View Answer

Answer: c
Explanation: The maximum current density is given by Richardson-Dushman equation.

11. In an electron beam, the average kinetic energy of an electron is given by __________
a) 2KT
b) 3KT
c) 1.5KT
d) 2.5KT
View Answer

Answer: a
Explanation: The average kinetic energy is equal to 2KT.

Sanfoundry Global Education & Learning Series – Power Plant Engineering.

To practice all areas of Power Plant Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

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