131. Fusible plug for boilers is made of fusible metal containing tin, lead, and___________________?
A. bismuth
B. copper
C. aluminium
D. nickel
E. iron

132. In forced recirculation 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 drum and through down-comers located in atmospheric condition 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. heating of water takes place in stages

133. In accelerated circulation type boiler________________?
A. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of stdam bubbles and hot water which rise to durm
B. water is supplied in drum and through downcomers” located in atmospheric conditon it passes to the water wall and rises to durm in the from of mixture of water and steam
C. feed pump is employed to supplement natural circulation in water wall type furnace
E. water is converted into steam in one pass without any recirculation
E. water is fed under high pressure and high velocity

134. Steam in water tube boiler as compared to fire tube boiler_________________?
A. can be raised rapidly
B. is raisd at slower rate
C. is raised at same rate
D. could be raised at fast/slow rate depending on design
E. none of the above is true

135. It is required to produce large amount of steam at low pressure. Which boiler should be used ?
A. pulverised fuel fired boiler
B. cochran boiler
C. lancashire boiler
D. babcock and wilcox boiler
E. stoker fired boiler

136. Which type of boiler can meet rapid changes of load____________________?
A. vertical fire tube type
B. horizontal fire tube type
C. horizontal water tube type
D. vertical water tube type
E. forced circulation type

137. Boiler stays are used to___________________?
A. prevent flat surfaces under pressure from tearing apart
B. take care of failure in shear
C. take care of failure in compression
D. provide support for boiler
E. provide foundation of boiler

138. Size of boiler tubes is specified by___________________?
A. mean diameter and thickness
B. inside diameter and thickness
C. outside diameter and thickness
D. outside diameter and inside diameter
E. outside diameter alone

139. The major axis of elliptical manholes on the shell should be provided___________________?
A. longitudinally
B. circumferentially
C. on dished end
D. anywhere
E. vertically

140. With increase in load, radiant super heater has____________________?
A. drooping characteristic
B. lihear characterisstic
C. rising characteristic
D. flat characteristic
E. none of the above

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