MCQ Questions on Generation of Electrical Power

51. The pH value of water used for boiler of thermal power plant is

(a) Unity
(b) 7
(c) Slightly more than 7
(d) 10

52. Find out the average monthly load factor

Given data

• Reading obtained for 1 month = 30 days
• kWh drawn per month = 386540
• Maximum demand = 1500 kW

(a) 35%
(c) 55%
(b) 45%
(d) 65%

53. The first nuclear power plant was built in India at which place? [UPPCL JE 2007]

(a) Tarapur
(b) Rana Pratap Sagar
(c) Kalpakkam
(d) Narora

54. Which alternator will have more number of poles? [Uttarakhand JE – 2013]

(a) Coupled to steam turbine
(b) Coupled to gas turbine
(c) Coupled to hydraulic turbine
(d) None of the above

55. The connected load of a consumer is 2 kW and his maximum demand is 1.5 kW. The demand factor of the consumer is

(a) 0.375
(b) 0.75
(c) 1.33
(d) None of these [UPPCL JE – 2007]

56. Which of the following is not a part of Steam Power Plant?

(a) Switch Yard
(b) Ash precipitators
(c) Draught fan
(d) Surge Chamber

57. Pollution due to Tidal Energy generation is usually

(a) Zero
(b) Low
(c) Moderate
(d) High [UPPCL JE 2016]

58. In a bio-gas plant, dome/gas collector is usually ……….. in shape. [UPPCL JE 2016]

(a) Conical
(b) Hemispherical
(c) Cuboidal
(d) Pyramidal

59. Capital cost on a nuclear plant is

(a) Very low
(c) Moderate
(b) Low
(d) Very high

60. ………… has the maximum life tenure. [UPPCL JE 2016]

(a) Wooden Poles
(b) Steel Poles
(c) Concrete Poles
(d) Steel Towers

61. Power generation of a thermal power plant is based on

(a) Rankine Cycle
(b) Otto Cycle
(c) Diesel Cycle
(d) Carnot Cycle [UPPCL JE – 2016]

62. In a steam power plant, …………. heats the feed water on its way to the boiler by deriving heat from the flue gases. [UPPCL JE 2016, 18]

(a) Superheater
(b) Economizer
(c) Preheater
(d) Turbine

63. Working fluid in a gas turbine plant is generally compressed in ………, …….. compressor. [UPPCL JE 2016]

(a) Reciprocating, single stage
(b) Reciprocating, multi stage
(c) Rotary, single stage
(d) Rotary, multi stage

64. High Head Power Plant has ……… turbine as common prime mover. [UPPCL JE 2016]

(a) Francis
(b) Pelton Wheel
(c) Kaplan
(d) Kaplan/ Pelton Wheel

65. Solar Energy cannot be used in which of the following processes?

(a) Energy production
(b) Nuclear reactions
(c) Purification of water
(d) Cooking of food [UPPCL JE 2016]

66. Installed capacity of Micro Hydel power plants is about

(a) 100 kW
(b) 2000 kW
(c) 6000 kW
(d) 15000 kW [UPPCL JE – 2016]

67. Which type of Hydel Power Plants can be used as both base and peak load plants? [UPPCL JE – 2016]

(a) Run-of-river plants with pondage
(b) Run-of-river plants without pondage
(c) Storage type plants
(d) Pumped storage plants

68. In context to solar energy production, the efficiency of flat plate collectors is usually

(a) 20 – 30%
(b) 30 – 50%
(c) 50 – 70%
(d) 70 – 90% [UPPCL JE – 2016]

69. In practice, Earth is chosen as a place of zero electric potential because it

(a) Is non-conducting
(b) Is casily available reference
(c) Keeps losing and gaining electric charge every day
(d) Has almost constant potential [UPPCL AE – 2016]

70. The power output from a hydro-electric power plant depends on

(a) Head, type of dam and discharge
(b) Type of dam, discharge and type of catchment area
(c) Type of draft tube, type of turbine and efficiency of the system
(d) Head, discharge and efficiency of the system

71. Core is insulated by ……… in a Shielded cable. [UPPCL AE – 2016]

(a) Impregnated paper
(b) VIR
(c) PVC/PE
(d) Gutta Percha

72. The term “penstock” is associated with which type of power plant? [UPPCL AE – 2016]

(a) Hydel
(c) Solar
(b) Nuclear
(d) Thermal

73. Which of the following will happen if the thickness of refractory wall of furnace is increased? [UPPCL JE 2018]

(a) Energy consumption will decrease
(b) Temperature inside the furnace will fall
(c) Temperature on the outer surface of furnace walls will drop
(d) Heat loss through furnace wall will increase

74. The capacity factor of a plant is equal to

(a) Maximum load/average load
(b) Average load/maximum load
(c) Maximum load/plant capacity
(d) Average load/plant capacity

75. Why regenerator is used in gas turbine power plant? [UPPCL JE – 2018]

(a) To produce extra heat
(b) To produce high pressure in chamber
(c) To produce high temperature
(d) To recover heat from exhaust gases

76. Which principle type of turbines is used in hydroelectric power station? [UPPCL JE – 2018]

(a) Impulse type
(b) Reaction type
(c) Both Impulse type and Reaction type
(d) None of these

77. Usually, diesel power station is used where demand of power is

(a) Very high
 (b) High
(c) Less
(d) None of these [UPPCL JE – 2018]

78. Which of the following is not a part of a modern wind turbine?

(a) Compressor
(b) Gearbox
(c) Nacelle
(d) Yaw drive

79. Which type of power stations use potential energy of water to produce electrical energy? [UPPCL JE – 2018]

(a) Diesel power station
(b) Nuclear power station
(c) Hydroelectric power station
(d) Steam power station

80. Which type of power station can be located at any place? [UPPCL JE 2018]

(a) Diesel power station
(b) Nuclear power station
(c) Hydroelectric power station
(d) Steam power station

81. Which type of generating system converts heat energy of coal into electrical energy? [UPPCL JE 2018]

(a) Diesel power station
(b) Nuclear power station
(c) Hydroelectric power station
(d) Steam power station

82. What is the capacity of India’s biggest thermal power plant? [UPPCL JE 2018]

(a) 5560 MW
(b) 5340 MW
(c) 4760 MW
(d) 4620 MW

83. What is the efficiency of diesel power station? [UPPCL JE 2018]

(a) 53 – 56%
(b) 22 – 27%
(c) 85 – 90%
(d) 35 – 42%

84. What is used as a prime mover in gas power plant?

(a) Gas turbine
(b) Diesel
(c) Water
(d) Pelton turbine [UPPCL JE – 2018]

85. Why surge tanks are used in hydroelectric power system? [UPPCL JE – 2018]

(a) For the protection of turbines
(b) For the protection of penstock
(c) For the protection of spillways
(d) None of the above

86. ……… is used for non conventional system to generate electrical energy. [UPPCL JE – 2018]

(a) Diesel electrical system
(b) Nuclear system
(c) Tidal energy
(d) Thermal system

87. Choose the correct schematic arrangement of nuclear power station. [UPPCL JE 2018]

(a) Nuclear reactor, heat exchanger, steam turbine, alternator
(b) Steam turbine, alternator, heat exchanger, nuclear reactor
(c) Steam turbine, heat exchanger, alternator, nuclear reactor
(d) Alternator, heat exchanger, nuclear reactor, steam turbine

88. Which of the following part or auxiliary is not used in diesel power station? [UPPCL JE 2018]

(a) Lubricating system
(b) Fuel supply system
(c) Steam generating system
(d) Intake air system

89. Which of the following radio-active byproducts releases from nuclear reaction? [UPPCL JE – 2018]

(a) Strontium
(c) Tritium
(b) Cesium
(d) All of these

90. Binary vapour cycles are used to

(a) Increase efficiency of the turbine
(b) Increase the efficiency of the plant
(c) Increase the performance of the condenser
(d) Balance the efficiency of turbine [UPPCL JE – 2018]

91. The amount of energy available in the wind at any instant is proportional to ………. of the wind speed.

(a) Square root
(b) Square
(c) Half
(d) Cube

92. Pugga valley in Ladakh is suitable for which of the following power generation? [UPPCL JE – 2018]

(a) Wind
(b) Solar
(c) Geo thermal
(d) All of these

93. NASA standard value for solar constant

(a) 1353 Watts/sq.m
(b) 116.5 Watts/sq.m
(c) 13.53 kw/sq.m
(d) 0.116 kw/sq.m

94. A man receives an electricity bill where his monthly consumption was given as 123 units. This commercial units is basically

(a) kWh
(b) kw
(c) Watt per hour
(d) Watt per second [UPPCL – 2016]

95. Which of these sources leave a larger carbon footprint?

(a) Hydro
(b) Solar
(c) Thermal
(d) Hydrogen

96. Combined cycle power plants may need

(a) MHD generator
(b) Thermionic converter
(c) Thermoelectric generator
(d) All of these

97. ……… are employed for the operation of Jaw Crushers. [UPPCL JE – 2016]

(a) DC shunt wound motor
(b) Squirrel cage induction motor
(c) Belted slip ring induction motor
(d) Any DC motor

98. For a consumer, the most economical power factor is generally

(a) 0.5 lagging
(b) 0.95 lagging
(c) 0.4 leading
(d) 0.75 leading [URPVUNL – 2015]

99. In Flat Demand Rate, the bill depends on;

1. Maximum Demand
2. Amount of Energy Consumed

Which of the following is/are correct?
(a) Neither 1 or 2
(b) Only 1
(c) Both 1 and 2
(d) Only 2

100. Power from

(a) Thermal plants are preferred for normal periods and Hydro plants are preferred for peak power periods
(b) Thermal plants are preferred for peak periods and Hydro plants are preferred for normal periods
(c) Thermal and hydro have no utility during peak periods
(d) Both thermal and hydro are preferred for normal periods [UPRVUNL JE 2016]