Power Plant Engineering Objective Questions And Answers

61. Petrothermal systems are composed of hot dry rock with

(a) petrochemicals.
(b) no underground water.
(c) large underground water.
(d) dense gases.

62. In petrothermal systems of geothermal energy having hot dry rock but no underground water, the energy is obtained by

(a) creating water wells.
(b) circulating compressed air.
(c) pumping water.
(d) any of the above.

63. In geothermal power plants waste water is

(a) discharged back to earth.
(b) discharged into sea.
(c) re-circulated after cooling in cooling towers.
(d) evaporated in ponds.

64. In a fuel cell cathode is of

(a) oxygen.
(b) ammonia.
(c) hydrogen.
(d) carbon monoxide.

65. In a fuel cell electrical energy is produced by

(a) reaction of hydrogen with oxygen.
(b) thermionic action.
(c) combustion of fuel in absence of oxygen.
(d) any of the above.

66. Direct conversion of heat energy into electrical energy is possible through

(a) MHD generators.
(b) thermionic converters.
(c) fuel or solar cell.
(d) both (a) and (b).

67. Which of the following power plants can generate power at unpredictable or uncontrollable time ?

(a) Tidal power plant.
(b) Wind power plant.
(c) Solar power plant.
(d) Any of the above.

68. For under water movement of a submarine the power is provided by

(a) tidal energy.
(b) MHD generator.
(c) batteries.
(d) diesel engine.
(e) thermionic generator.

69. The power station that does not require any moving part is

(a) Thermionic convertor.
(b) Wind power generation.
(c) Tidal power plant.
(d) Solar power generation.

70. A generating station which has a high investment cost and low operating cost is usually operated as a

(a) peak load station.
(b) base load station.
(e) medium load station.
(d) None of the above.

71. Which of the following power plants normally operates at high speeds ?

(a) Hydroelectric.
(b) Steam-turbine.
(c) Petrol engine.
(d) Diesel engine.

72. Which of the following power plants is free from environmental problems ?

(a) Diesel engine.
(b) Nuclear.
(c) Hydroelectric.
(d) Steam.

73. Which power plant cannot have single unit of 100 MW capacity ?

(a) Steam power plant.
(b) Nuclear power plant.
(c) Hydroelectric power plant.
(d) Diesel engine power plant.

74. Which of the following plants will take least time in starting from cold conditions to full-load operation ?

(a) Nuclear power plant.
(b) Steam power plant.
(c) Hydroelectric plant.
(d) Gas turbine plant

75. Which of the following generating plants has the minimum operating cost ?

(a) Steam plant.
(b) Hydroelectric plant.
(c) Nuclear plant.
(d) Diesel plant.

76. Which of the following plants has the maximum capital cost ?

(a) Steam plants.
(b) Hydro-plants.
(c) Diesel plants.
(d) Nuclear plants.

77. In a steam power plant, which of its following components needs maximum maintenance attention ?

(a) Condenser.
(b) Boiler.
(c) Steam turbine.
(d) Superheater.

78. A steam power plant is being supplied with coal having much more ash content than that for which it was designed. Which of its following units needs major modifications ?

(a) Ash handling unit.
(b) Pulverizing unit.
(c) Condenser.
(d) Cooling towers.

79. A diesel power plant is generally used as a /an

(a) base load plant.
(b) peak load plant.
(c) stand by plant/emergency plant.
(d) any of the above.

80. A gas turbine power plant is best suited for

(a) base loads.
(b) peak loads.
(c) emergency.
(d) none of the above.