economics of power generation MCQs – Page 2

Practise focused economics of power generation questions with marked answers for exam preparation and subject revision.

economics of power generation Mcqs
51. For which of the following power plants highly skilled engineers are required for running the plants?
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A. Gas turbine power plants

B. Solar power plants

C. Nuclear power plants

D. Hydro-electric power plants

52. Annual depreciation cost is calculated by___________?
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A. sinking fund method

B. straight line method

C. both A. and B.

D. none of the above

53. Which of the following is an advantage of static capacitor for power factor improvement?
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A. Little maintenance cost

B. All of the above

C. Low losses

D. Ease in installation

54. For a power plant which of the following constitutes running cost?
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A. All of the above

B. Cost of fuel

C. Cost of lubricants

D. Cost of wages

55. During load shedding:
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A. system voltage is reduced

B. system frequency is reduced Efficiency is the secondary consideration in

C. some loads are switched off

D. system power factor is changed

56. Which of the following is not necessarily an advantage of interconnecting various power stations?
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A. Increased reliability

B. Improved frequency of power supplied

C. Reduction in total installed capacity

D. Economy in operation of plants

57. _____________can generate power at unpredictable or uncontrolled times?
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A. Wind power plant

B. Tidal power plant

C. Any of the above

D. Solar power plant

58. Load factor of a power station is generally___________?
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A. more than unity

B. equal to zero Diversity factor is always

C. less than unity

D. equal to unity

59. For a diesel generating station the useful life is expected to be around_________Years?
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A. 50 to 75 years

B. 20 to 50 years

C. 15 to 20 years

D. 75 to 100 years

60. With reference to a power station which of the following is not a fixed cost?
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A. Depreciation

B. Fuel cost

C. Interest on capital

D. Insurance charges

61. The increased load during summer months is due to____________?
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A. increased business activity

B. increased use of fans and air conditioners

C. none of the above

D. increased water supply

62. Which of the following are not repayable after a stipulated period?
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A. Shares

B. Fixed deposits

C. Cash certificates

D. Bonds

63. Diversity factor has direct effect on the____________?
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A. fixed cost of unit generated

B. running cost of unit generated

C. both A. and B.

D. neither A. nor B.

64. In an interconnected system, the diversity factor of the whole system:
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A. decreases

B. none of the above

C. increases

D. remains unchanged

65. Which of the following generating station has minimum running cost ?
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A. Nuclear

B. Diesel

C. Hydro

D. Thermal

66. ___________ will offer the least load.
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A. Electric shaver

B. Television

C. Hair dryer

D. Vacuum cleaner

67. Load curve of a power plant has always____________?
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A. All of these

B. negative slope

C. positive slope

D. zero slope

68. For the same cylinder dimensions and speed, which of the following engine will produce least power?
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A. Petrol engine

B. Supercharged engine

C. Diesel engine

D. All of the above engines will equal power

69. Which of the following is the disadvantage of static capacitor for power factor improvement?
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A. Cannot be repaired

B. All of the above

C. Easily damaged by high voltage

D. Short service life

70. Which of the following is not a method for estimating depreciation charges?
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A. Straight line method

B. Sinking fund method

C. Halseys 5050 formula

D. Diminishing value method

71. The primary reason for low power factor is supply system is due to installation of____________?
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A. induction motors

B. synchronous motors

C. single phase motors

D. d.c. motors

72. A power transformer is usually rated in____________?
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A. kW

B. kVA

C. kVAR

D. kWh

73. Load shedding is possible through which of the following?
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A. Switching of the loads

B. Frequency reduction

C. Any of the above

D. Voltage reduction

74. ___________ is invariably used as base load plant.
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A. Pumped storage plant

B. Nuclear power plant

C. Gas turbine plant

D. Diesel engine plant

75. A low utilization factor for a plant indicates that
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A. plant is used for stand by purpose only

B. plant is used for base load only

C. plant is used for peak load as well as base load

D. plant is under maintenance

76. Which of the following plants is almost inevitably used as base load plant?
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A. Pumped storage plant

B. Nuclear power plant

C. Gas turbine plant

D. Diesel engine plant

77. Annual operating expenditure of a power plant consists of____________?
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A. semi-fixed charges

B. running charges

C. all of the above

D. fixed charges

78. The effect of electric shock on human body depends on which of the following?
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A. voltage

B. duration of contact

C. current

D. all of the above
79. Generators for peak load plants are usually designed for maximum efficiency at____________?
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A. 25 percent overload

B. 25 to 50 percent full load

C. full load

D. 50 to 75 percent full load
80. Which of the following, in a thermal power plant, is not a fixed cost?
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A. Insurance charges

B. Depreciation

C. Interest on capital

D. Fuel cost
81. Load curve is useful in deciding the_____________?
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A. operating schedule of generating units

B. sizes of generating units

C. all of the above

D. total installed capacity of the plant

82. Air will not be the working substance in which of the following?
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A. Petrol engine

B. Open cycle gas turbine

C. Closed cycle gas turbine

D. Diesel engine

83. Annual depreciation of the plant it proportional to the earning capacity of the plant vide
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A. reducing balances depreciation

B. none of the above

C. sinking fund depreciation

D. straight line depreciation

84. _________offers the highest electric load.
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A. Vacuum cleaner

B. Washing machine

C. Toaster

D. Television set

85. __________ industry has the least power consumption per ton of product?
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A. Caustic soda

B. Soap

C. Vegetable oil

D. Sugar

86. In power plants insurance cover is provided for which of the following?
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A. Equipment only

B. Skilled workers only

C. All of the above

D. Unskilled workers only

87. A load curve indicates___________?
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A. average kWh (kW) energy consumption during the period

B. average power used during the period

C. none of the above

D. either of the above

88. Salvage value of the plant is always____________?
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A. any of the above

B. negative

C. zero

D. positive

89. Direct conversion of heat into electrical energy is possible through____________?
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A. none of the above

B. fuel cells

C. MHD generators

D. solar cells

90. Annual depreciation as per straight line method, is calculated by__________?
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A. the capital cost divided by number of year of life

B. increasing a uniform sum of money per annum at stipulated rate of interest

C. the capital cost minus the salvage value, is divided by the number of years of life

D. none of the above

91. Which of the following equipment provides fluctuating load?
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A. Lathe machine

B. Exhaust fan

C. Welding transformer

D. All of the above

92. Which of the following source of power is least reliable?
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A. Geothermal power

B. Wind power

C. Solar energy

D. iMHD
93. Maximum demand on a power plant is_________________?
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A. the greatest of all short time interval averaged demand during a period

B. instantaneous maximum value of kVA supplied during a period

C. both A. or B.

D. none of the above

94. ____________is the reserved generating capacity available for service under emergency conditions which is not kept in operation but in working order.
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A. Hot reserve

B. Cold reserve

C. Spinning reserve

D. Firm power

95. power plant is expected to have the longest life?
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A. Diesel

B. Hydroelectric

C. Any of the above

D. Steam

96. Power plant having maximum demand more than the installed rated capacity will have utilization factor?
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A. none of the above

B. equal to unity

C. less than unity

D. more than unity
97. Which of the following is the disadvantage due to low power factor?
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A. Increased transmission losses

B. Poor voltage regulation

C. All of the above

D. High cost of equipment for a given load

98. Following power plant has instant starting?
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A. nuclear power plant

B. hydro power plant

C. diesel power plant

D. both B and C

E. none of the above