Power Plant Engineering Objective Questions And Answers

1. Seeding material commonly used in MHD generator is

(a) sodium.
(b) aluminum.
(c) potassium.
(d) cesium.

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2. Which of the following liquid metal is not used as an MHD working fluid ?

(a) Potassium.
(b) Sodium
(c) Lithium
(d) all of the above

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3. The exhaust from an MHD generator is at a temperature of about

(a) 800°C
(b) 2,200°C
(c) 3,500°C
(d) 1,200°C

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4. In an MHD generator the ionization potential of the seeding material should be

(a) very high.
(b) the lowest possible.
(c) neither high or low.
(d) either high or low.

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5. An MHD system for efficient operation needs

(a) a magnet capable of producing high magnetic flux density.
(b) injection and recovery of seed material
(c) arrangement for superheating of air.
(d) all of the above.

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6. The advantage(s) of an MHD system is/are

(a) low pollution.
(b) good efficiency.
(c) conservation of fuel.
(d) absence of moving parts.
(e) all of the above.

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7. The concept of MHD generation depends much more on the……..of the gas in the duct.

(a) permeability
(b) permittivity
(c) conductivity
(d) none of these

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8. The materials used for electrodes in thermoelectric generators are

(a) metal conductors.
(b) carbon.
(c) semiconductors.
(d) insulators.

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9. Thermionic convertor utilizes

(a) Seebeck effect.
(b) thermionic emission effect.
(c) Peltier effect.
(d) Thomson effect.

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10. The solar or photovoltaic cell converts

(a) chemical energy into electrical energy.
(b) solar radiations into electrical energy.
(c) solar radiations into thermal energy.
(d) thermal energy into electrical energy.

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11. Photovoltaic solar energy conversion system makes use of

(a) solar pond.
(b) fuel cell.
(c) Edison cell.
(d) none of the above.

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12. The efficiency of solar cell is about

(a) 25%
(b) 15%
(c) 40%
(d) 60%

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13. Solar cells are made of

(a) aluminum.
(b) germanium.
(c) silicon.
(d) cadmium.

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14. The voltage of a solar cell is

(a) 0.5 – 1 V
(b) 1 – 2 V
(c) 2 – 3 V
(d) 4 – 5 V

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15. The output of a solar cell is of the order of

(a) 0.5 W
(b) 1.0 W
(c) 5.0 W
(d) 10.0 W

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16. Solar cells, for power generation, have the mains drawback(s) of

(a) low efficiency.
(b) lack of availability.
(c) high cost and maintenance problems.
(d) all of the above.

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17. A module is a

(a) series-arrangement of solar cells.
(b) parallel arrangement of solar cells.
(c) series parallel arrangement of solar cells.
(d) none of the above.

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18. For satellites the source of energy is

(a) solar cell.
(b) fuel cell.
(c) Edison cell.
(d) cryogenic storage.

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19. Fuel cells have conversion efficiencies of about

(a) 25%
(b) 40%
(c) 65%
(d) 85%

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20. Fuel cell converts chemical energy into

(a) heat energy.
(b) low-voltage direct current electrical energy.
(c) low-voltage alternating current electrical energy.
(d) mechanical energy.

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