81. Arrange the following in the correct sequence in which the flue gas passes through them after coming out of the boiler in a thermal power station:
(1) ID Fan.
(2) Air preheater.
(3) Economiser.
(4) Electrostatic precipitator.
Select the answer using the codes given below
(a) 4, 3, 2, 1
(b) 3, 2, 4, 1
(c) 2, 1, 4, 3
(d) 1, 4, 3, 2
Answer: (b) 3, 2, 4, 1
82. In bleeder turbines, part of the steam is extracted for
(a) condensation.
(b) reheating.
(c) feed water heating.
(d) secondary air heating.
Answer: (c) feed water heating.
83. Which of the following is not a fire tube boiler ?
(a) Babcock and Wilcox.
(b) Lancashire.
(c) Locomotive.
(d) Cochron.
Answer: (a) Babcock and Wilcox.
84. Water is supplied to the boiler at
(a) atmospheric pressure.
(b) more than steam pressure in the boiler.
(c) slightly more than atmospheric pressure.
(d) any pressure.
Answer: (b) more than steam pressure in the boiler.
85. The efficiency of a boiler used in a modem steam power plant is of the order of
(a) 30%
(b) 50%
(c) 85%
(d) 100%
Answer: (c) 85%
86. Steam pressure used in steam power plants in India is in the range of
(a) 110 – 170 kg/cm2
(b) 40 – 80 kg/cm2
(c) 20 – 40 kg/cm2
(d) 250 kg/cm2
Answer: (a) 110 – 170 kg/cm2
87. Critical pressure for steam is in the range of
(a) 50 – 100 kg/cm2
(b) 100 – 200 kg/cm2
(c) 200 – 250 kg/cm2
(d) above 300 kg/cm2
Answer: (c) 200 – 250 kg/cm2
88. A super critical boiler is one that operates above the pressure and temperature of the following values
(a) 100 kg/cm2 and 540°C
(b) 218 kg/cm2 and 540°C
(c) 100 kg/cm2 and 373°C
(d) 218 kg/cm2 and 373°C
Answer: (b) 218 kg/cm2 and 540°C
89. In a boiler, the carry over of slugs of water into the piping because of dirty water is called the
(a) foaming.
(b) pitting.
(c) scalping.
(d) beating.
Answer: (b) pitting.
90. Which of the following steam will have least enthalpy ?
(a) Dry and saturated steam at 25 kg/cm2.
(b) Wet steam at 25 kg/cm2.
(c) Superheated steam at 25 kg/cm2.
(d) All of the above will have the same enthalpy.
Answer: (b) Wet steam at 25 kg/cm2.
91. The boilers using lignite as fuel do not use
(a) spreader stoker.
(b) travelling grate stoker.
(c) underfeed stoker.
(d) all of the above.
Answer: (c) underfeed stoker.
92. Pipes carrying steam are generally of
(a) steel.
(b) cast iron.
(c) aluminum.
(d) cobalt.
Answer: (a) steel.
93. For given power a water tube boiler occupies
(a) less floor area and less height.
(b) more floor area and less height.
(c) less floor area and more height.
(d) more floor area and more height than a fire tube boiler.
Answer: (c) less floor area and more height.
94. The selection of the type and size of a steam boiler depends upon
(a) the power required and working pressure.
(b) the geographical position of the powerhouse.
(c) the fuel and water availability.
(d) all of the above factors.
Answer: (a) the power required and working pressure.
95. In a superheater
(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 the same.
Answer: (c) temperature rises and pressure remains unchanged.
Power Plant Engineering MCQ
- 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
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