76. A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are
(a) supplied by same manufacturer loose and assembled at site
(b) supplied mounted on a single base
(c) purchased from several parties and packed together at site
(d) packaged boiler does not exist
(e) none of the above.
Ans: b
77. The biggest size of thermal power unit operating in India is
(a) 30 MW
(b) 60 MW
(c) 100 MW
(d) 210 MW
(e) 500 MW.
Ans: e
78. Which of the following coals has the highest calorific value
(a) anthracite coal
(b) bituminous coal
(c) lignite
(d) peat
(e) wood.
Ans: a
79. The high pressure boiler is oiie producing steam at a pressure more than
(a) atmospheric pressure
(b) 5 kg/cm2
(c) 10 kg/cm2
(d) 40 kg/cm2
(e) 75-80 kg/cm2.
Ans: e
80. The crown of the fire box is made hemispherical in order to
(a) give maximum space
(b) give maximum strength
(c) withstand pressure inside boiler
(d) resist intense heat in fire box
(e) enable easy,manufacture.
Ans: d
81. Which of the following is steam dbal
(a) non-coking bituminous coal
(b) brown coal
(c) pulverised coal
(d) coking bituminous coal
(e) none of the above.
Ans: a
82. The fire tubes in, a Coarran and Scotish marine boiler are
(a) horizontal
(b) vertical
(c) inclined
(d) both horizontal and vertical
(e) horizontal and inclined.
Ans: a
83. The diameter of internal flue tubes in a Lancashire boiler compared to its shell is
(a) one-half
(b) one-third
(c) one-fourth
(d) one-fifth
(e) two-fifth.
Ans: e
84. The basic purpose of drum in boiler is to
(a) serve as storage of steam
(b) serve as storage of feed water for water wall
(c) remove salts from water
(d) separate steam from water
(e) control level.
Ans: d
85. Duplex feed pumps are used in small steam boilers. These operate on the principle of
(a) centrifugal pump
(b) axial flow pump
(c) gear pump
(d) ejector pump
(e) reciprocating pump.
Ans: e
86. The best suited coal for chain or travelling grate stoker boiler is
(a) coking coal
(b) non coking or free burning coal
(c) pulverised coal
(d) high sulphur coal
(e) least ash content coal.
Ans: b
87. In natural circulation type boiler
(a) heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
(b) water is supplied in durm and through down-comers located in atmospheric conditon it passes to the water wall and rises to drum in the form of mixture of water and steam
(c) feed pump is employed to supplement natural circulation in water wall type furnace
(d) water is converted into steam in one . pass without any recirculation
(e) water is fed at atmospheric pressure.
Ans: a
88. Hard coke is produced by carborisation of coal at
(a) atmospheric temperature
(b) 500-600°C
(c) 70O-850°C
(d) 95O-1100°C
(e) 120O-1500°C.
Ans: d
89. Hard coke is used in
(a) cement industry
(b) thermal power plant
(c) blast furnace
(d) domestic use
(e) locomotives
Ans: c
90. Pick up the correct statement as regards Cornish boiler and Lancashire boiler
(a) cornish is fire tube and lancashire is water tube
(b) cornish is water tube and lancashire is fire tube
(c) cornish has two fire tubes and lancashire has one
(d) lancashire has two fire tubes and cornish has one
(e) both have two fire tubes.
Ans: d
91. In locomotive boiler, maximum steam pressure is limited to
(a) 1 kg/cm2
(b) 5 kg/cm2
(c) 10 kg/cm2
(d) 18 kg/cm2
(e) 31 kg/cm2.
Ans: d
92. Locomotive boiler is of the following type
(a) multitubular
(b) horizontal
(c) internally fired
(d) mobile
(e) all of the above.
Ans: e
93. The shell diameter and length of locomotive boiler are
(a) 1.5 m, 4 m
(b) 1.5 m, 6 m
(c) 1 m, 4 m
(d) 2 m, 4 m
(e) 1.5 m, 8 m.
Ans: a
94. The diameters of fire tubes and superheaer tubes in locomotive boiler are
(a) 47.5 mm, 130 mm
(b) 32.5 mm, 180 mm
(c) 65.5 mm, 210 mm
(d) 24.5 mm, 65 mm
Ans: a
95. The water tubes in a babcock and wilcox boiler are
(a) horizontal
(b) vertical
(c) inclined
(d) horizontal and inclined
(e) vertical and inclined.
Ans: c
96. Which of the following varieties of coals is mostly used in steam boilers
(a) non-coking bituminous coal
(b) brown coal
(c) peat
(d) coking bituminous coal
(e) none of the above.
Ans: e
97. The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is
(a) more
(b) less
(c) same
(d) could be more or less depending on other factors
(e) none of the above.
Ans: a
98. A boiler in India should conform to safety regulations of
(a) DIN
(b) BS
(c) ASTM
(d) IBR
(e) GOST.
Ans: d
99. The function of injector used in small steam plants is to
(a) create vacuum in furnace
(b) create vacuum at turbine exhaust
(c) pump feed water
(d) dose chemicals in feed water
(e) control steam temperature by injecting water.
Ans: c
100. Which of the following boilers is best suited to meet fluctuating demands
(a) babcock and wilcox
(b) locomotive
(c) lancashire
(d) cochran
(e) comish.
Ans: b