Power Plant Engineering Mcq Questions Pdf

101. The draught produced by steel chimney in comparison to that produced by brick chimney, for the same height, is

(a) more.
(b) less.
(c) the same.
(d) unpredictable.

102. Artificial draught is produced by

(a) a forced fan.
(b) an induced fan.
(c) induced and forced fan.
(d) all of the above.

103. For the same draught produced the power of forced draught fan, in comparison to that of induced draught fan, is

(a) more.
(b) less.
(c) the same.
(d) may be more or less.

103. The artificial draught is usually designed to produce

(a) more draught.
(b) less smoke.
(c) low temperature of chimney gas.
(d) all of the above.

104. The draught produced by a chimney of a given height at a given outside temperature

(a) decreases with the increase in temperature of chimney gases.
(b) increases with the increase in temperature of chimney gases.
(c) remains unchanged irrespective of temperature of chimney
gases.
(d) may increase or decrease.

105. The natural draught

(a) is provided by a chimney.
(b) is used in small steam boilers.
(c) can also be used in large steam boilers if economizers and pre-heaters have been used.
(d) both (a) and (b).

106. The magnitude of natural draught depends upon

(a) average temperature difference between flue gases within the chimney and the outside air.
(b) height of the chimney above the furnace grate level.
(c) weather and operating conditions.
(d) all of the above.

107. For forced draught the blower is located

(a) at the top of the chimney.
(b) near the base of the chimney.
(c) near the base of the boiler.
(d) any where permissible.

108. The height of chimney, in a steam power stations, is governed by

(a) the draught to be produced.
(b) the quantity of flue gases being produced.
(c) pollution control.
(d) all of the above.

109. The pressure at the furnace is minimum in case of

(a) induced draught.
(b) forced draught
(c) balanced draught.
(d) natural draught.

110. In forced draught the main function of the chimney is to

(a) discharge gases high up in the atmosphere from the point of view of air pollution.
(b) accelerate the fuel combustion.
(c) reduce the temperature of the discharged hot gases.
(d) all of the above.

111. Induced draught fans amused to

(a) cool the steam let out by the turbine in thermal station.
(b) cool the hot gases coming out of the boiler.
(c) force the air inside the coal furnace.
(d) control the heat generated in a nuclear reactor.
(e) pull the gas out of the chimney.

112. What it the nominal pH value of water that is to be maintained in a steam raising thermal power station?

(a) 0.0
(b) 7.0
(c) 8.5
(d) 14.3

113. The feed water treatment is done mainly to avoid

(a) embrittlement problem.
(b) carry over problem.
(c) corrosion and scale formation problems.
(d) all of the above problems.

113. Boiling down of boiler water is done so as to

(a) control the solid concentration in the boiler water by removing some of the concentrated saline water.
(b) remove dissolved gases in the water.
(c) reduce boiler pressure.
(d) increase steam temperature.

114. It is necessary to heat water before feeding it back to the boiler as because of this

(a) the dissolved oxygen and carbon dioxide which would other-wise corrode boiler are removed in the feed water heater.
(b) thermal stresses due to cold water entering the boiler drum are avoided.
(c) some other impurities carried by steam and condensate due to corrosion in boiler and condenser are precipitated outside the boiler.
(d) all of the above.

115. Huge quantity of water is required in a steam power plant. It is required

(a) to raise the steam in boilers.
(b) for cooling purposes such as in condensers.
(c) as a carrying medium such as in disposal of ash.
(d) all of the above .

116. For a 3-element feed water control in a coal-fired thermal power station, measurements of level of water in the boiler drums is made so that the water level does not

(a) exceed a specified upper limit.
(b) fall below a specified lower limit.
(c) violate specified upper and lower limits.
(d) restrict to a specified limit.

117. The auxiliary consumption in a thermal power (steam) station is

(a) 2 – 5%
(b) 8 – 10%
(c) 15 – 20%
(d) 20 – 25%

118. Turbo-alternators run at

(a) a variable speed around 2,000 rpm.
(b) a constant speed of 1,000 rpm.
(c) a constant speed of 3,000 rpm.
(d) a variable speed above 1,000 rpm.
(e) none of the above.

119. Large size steam plants and nuclear plants are suitable for

(a) peak loads.
(b) intermediate loads.
(c) base loads.
(d) both base and peak loads

120. The efficiency of a nuclear power plant is less than that of a conventional fuel fired thermal plant because of

(a) less rejection of heat in the condenser.
(b) higher temperature conditions.
(c) higher pressure conditions
(d) low temperature and pressure conditions.

 

• Power Plant Engineering MCQ Part – 1
• Power Plant Engineering MCQ Part – 2
• Power Plant Engineering MCQ Part – 3
• Power Plant Engineering MCQ Part – 4
• Power Plant Engineering MCQ Part – 5
• Power Plant Engineering Mcq Questions Pdf

©yourelectricalguide.com/ power plant engineering mcq questions pdf.