MCQ Questions on Generation of Electrical Power

101. Which one of the following is a boiler fitting? [Jharkhand JE 2017]

(a) Steam separator
(b) Blow-off cock
(c) Economizer
(d) Super heater

102. Which plant has high depreciation charges?

(a) Wind power plant
(b) Thermal plant
(c) Hydroelectric plant
(d) Diesel plant

103. The function of economiser in thermal power plant is to

(a) Extract heat from flue gases and uses it for heating feed water to boiler
(b) Condense the steam exhausted from turbine
(c) Remove carbon particles from flue gases
(d) Increase temperature of steam coming from boiler before admitting to turbine [LMRC JE – 2016]

104. In a thermal power plant of moderate size, electrical power generated, at voltage

(a) 110 kV
(b) 230 V
(c) 440 V
(d) 11 kV [UJVNL – 2016]

105. Which of the following is considered as superior quality of coal? [UJVNL – 2016]

(a) Peat
(b) Coke
(c) Bituminous coal
(d) Lignite

106. In coal-fired thermal power stations, what are the electrostatic precipitators used for?

(a) To remove dust particles setting on the bus bar conductors in the station yard
(b) To condense steam by electrostatic means
(c) To keep the air heaters clean
(d) To collect the dust particles from the flue gases [FCI – 2015]

107. Which one of the following is used to measure temperature inside a boiler furnace? [BSNL TTA JE 2013]

(a) Resistance thermometer
(b) Bimetallic thermocouple
(c) Optical pyrometer
(d) Thermistor

108. Which of the following in a thermal power plant, is not a fixed cost? [UPRVUNL – 2015]

(a) Fuel cost
(b) Interest on capital
(c) Depreciation
(d) Insurance charges

109. The highest rating transformer is likely to found application in

(a) Distribution
 (b) Transmission
(c) Generation
(d) Sub station [JE Trainee – 2013]

110. For domestic installation the load of house is considered in which category

(a) Inductive only
(b) Resistive and inductive
(c) Resistive only
(d) Resistive and capacitive [JE Trainee 2013]

111. The overall efficiency of a thermal power plant is equal to

(a) Rankine cycle efficiency
(b) Carnot cycle efficiency
(c) Regenerative cycle efficiency
(d) Boiler efficiency x Generator efficiency x Turbine efficiency

112. Which of the following in not a type of tariff?

(a) Flat demand rate
(b) Income rate
(c) Block meter rate
(d) Hopkinson demand rate [LMRC – 2015]

113. Compounding of steam is done for

(a) reducing the work done
(b) increasing the rotor speed
(c) reducing the rotor speed
(d) balancing the turbine [LMRC – 2015]

114. Major share of power generated in India is through

(a) Thermal Power Plants
(b) Nuclear Power Plants
(c) Hydro-electric Power Plants
(d) Solar energy [Uttarkhand JE – 2013]

115. The advantage of using pulverized fuel is

(a) Higher boiler efficiency
(b) Easy and complete combustion
(c) Low air requirement
(d) All of the above
[Uttarkhand JE 2013]

116. In a thermal power plant, feed water heaters, super heaters and air preheaters are mainly used to

(a) Have a better dust removal in the plant
(b) Have a better ash removal in the plant
(c) Increase the efficiency of the plant
(d) None of the above [UPSSSC – 2015]

117. Through which source is maximum electricity generated in the world?

(a) Water
(b) Nuclear power
(c) Coal
(d) Solar power [UPSSSC – 2015]

118. Coal used in power plant is also known as

(a) Steam coal
(b) Charcoal
(c) Coke
(d) Soft coal [UPSSSC – 2015]

119. The cost of fuel transportation is minimum in

(a) Steam power plant
(b) Diesel power plant
(c) Hydro-electric plant
(d) Coal based power plant

120. Solar cell is a

(a) Photovoltaic cell
(b) Photo radiative device
(c) Photo conductive device
(d) Photo emissive device [UPRVUNL – 2015]

121. Electrostatic Precipitators are used for following

(a) Particulate emission control
(b) Water pollution control
(c) Noise pollution control
(d) Energy pollution control

122. For the proper combustion of fuel in a thermal power plant, a proper circulation of air is also needed. The same is provided with the help of

(a) Draft fan
(c) Condenser
(b) Economiser
(d) Cooling Tower [UPPCL – 2016]

123. What is separated with the help of magnetic separators in a coal preparation plant? [UPPCL – 2016]

(a) Pebbles
(b) Iron particles
(c) Dust
(d) Sand

124. A condenser in a thermal power plant condenses steam coming out of

(a) Boiler
(b) Turbine
(c) Economiser
(d) Super heater

125. Which is not fundamental element of cogeneration plant?

(a) Prime mover
(b) Electricity generator
(c) Heat recovery system
(d) Power factor improvement system [MP JE 2015, 2016]

126. Select the INCORRECT statement regarding Thermal Power Stations? [UPPCL AE – 2016]

(a) Condenser converts steam into feed water
(b) Economizer is run by super heated steam and generates mechanical power
(c) Combustion takes place in boiler
(d) Steam is converted into super heated steam in super heater

127. In a super-heater of steam plant the

(a) Pressure rises and temperature drops
(b) Temperature rises and pressure drops
(c) Temperature rises and pressure remains unchanged
(d) Pressure rises and temperature remains unchanged

128. What should be the direction for fan to produce Induced draught in right direction

(a) In any direction
(b) Below the furnace
(c) Upper part of chimney
(d) Lower part of chimney

129. The efficiency of thermal power plant increases by

(a) Burning coal in excess
(b) Excessive use of water
(c) Decreasing the load on the plant
(d) Use of high pressured steam [UPPCL JE – 2016]

130. Boiler is a component of thermal power plants in which

(a) Coal is not combusted
(b) Water is converted into high pressured vapours
(c) Air is preheated
(d) Gases are cooled

131. In power systems the governors are generally used as an essential part of all types of turbines to control the

(a) Voltage phase angle
(b) Reactive power output
(c) Frequency
(d) Voltage magnitude

132. The hydro generators (HG) and steam turbines (ST) run at ……….. respectively. [UPRVUNL JE 2016]

(a) High speeds and low speeds
(b) Both have high speeds
(c) Low speeds and high speeds
(d) Both have low speeds

133. Spillways are constructed for

(a) Solar energy plants
(b) Gas based plants
(c) Hydro plants
(d) Thermal plants

134. Which of the following is used for cooling in large alternators

(a) Fan
(b) Air conditioner
(c) Cooler
(d) Air ducts

135. The supply frequency of AC is,

(a) 60 Hz
(b) 40 Hz
(c) 50 Hz
(d) 45 Hz

136. Pumped storage plants are used for

(a) Peak load plant
(b) Peak and base load plant
(c) Cogeneration plant
(d) Base load plant

137. Kaplan turbine is

(a) Inward flow, impulse turbine
(b) Out ward flow, reaction turbine
(c) A high head, plant mixed flow turbine
(d) Low head, axial flow turbine

138. Steam turbines converts the steam energy into

(a) Mechanical energy
(b) Electrical energy
(c) Chemical energy
(d) Nuclear energy

139. Which of the following controls the speed of turbine

(a) Alternator
(b) Valve house
(c) Power house
(d) Speed governer

140. Which of following power plant effects the least environment pollution? [UPPCL – 2015]

(a) Diesel generating station
(b) Hydro electric power station
(c) Thermal power plant
(d) Nuclear power plant

141. The annual depreciation of a hydro power plant is about

(a) 0.5 – 1.5%
(b) 5 – 10%
(c) 10 – 20%
(d) 25 – 30% [UPRVUNL – 2015]

142. Francis and Kaplan turbines fall under the category of

(a) Impulse turbine
(b) Reaction turbine
(c) Axial flow
(d) Impulse and reaction combined [LMRC – 2015]

143. For the same power output, operating charges are minimum in a

(a) Gas turbine plant
(b) Hydro power plant
(c) Thermal plant
(d) Nuclear plant

144. The coolant used in NPP

1. High thermal conductivity
2. Should be corossion less
3. Make oxides when contact with moisture

Which of the following statement is wrong
(a) only 3
(c) only 1
(b) only 2 and 3
(d) only 1 and 3

145. The flow duration curve at a given head of a hydroelectric plant is used to determine:

(a) Diversity factor of the plant
(b) Total power at the site
(c) Total energy available
(d) Load factor of the plant

146. In hydro power station which components is used to step up the generating voltage to a suitable transmission voltage? [MP JE – 2016]

(a) Transformer
(b) Generator
(c) Transmission line
(d) Turbine

147. Which of the turbine is used for low head, high flow rate

(a) Pelton wheel
(b) Francis turbine
(c) Kaplan turbine
(d) All of these

148. Which of the following is used as water storage

(a) Penstock
(b) Surge tank
(c) Tailrace
(d) Reservoir [UPPCL-2016]

149. The generator which gives dc supply to the rotor is called

(a) Converter
(c) Inverter
(b) Exciter
(d) Rectifier [DMRC JE 2014]

150. Direct conversion of heat electrical energy is done by

(a) Fuel cells
(b) Stem cells
(c) Solar cells
(d) MHD generators [LMRC – 2015]