91. The capacity of induced draft fan compared to forced draft fan in a boiler is__________________?
A. same
B. more
C. less
D. less or more depending on size of boiler
E. unpredictable

92. Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of__________________?
A. higher effectiveness of boiler
B. high calorific value coal being burnt
C. fouling of heat transfer surfaces
D. raising of steam temperature
E. leakage of air

93. The three “Ts” for good combustion are____________________?
A. temperature, time, and turbulence
B. total air, true fuel, and turbulence
C. thorough mixing, total air, and temperature
D. total air, time, and temperature
E. none of the above

94. The safety valve on boiler drum compared to safety valve on super heater is set at ________________?
A. same value
B. higher value
C. lower value
D. lower/higher depending on steam flow
E. unpredictable

95. The proximate analysis of fuel lists__________________?
A. various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume
B. various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight
C. fuel constituents as percent by volume of moisture, volatile, fixed carbon and ash
D. fuel constituents as percent by weight of moisture, volatile, fixed carbon and ash
E. moisture and ash free heating value

96. In water wall furnace, the heat is transferred to the water-walls by _________________?
A. convection
B. radiation
C. conduction
D. radiation and conducton
E. radiation and convection

97. The feed check valve is used in order to ______________________?
A. regulate flow of boiler water
B. check level of water in boiler drum
C. recirculate unwanted feed water
D. allow high pressure feed water to flow to drum and not allow reverse flow to take place
E. none of the above

98. The basic job of feed water treatment in boilers is to overcome the problem of __________________?
A. corrosion
B. scale
C. carryover
D. embrittlement
E. all of the above

99. The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?
A. increases
B. decreases
C. remains unchanged
D. increases/decreases depending on steam temperature requirements
E. unpredictable

100. For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?
A. more heating surface
B. less heating surface
C. equal heating surface
D. heating surface depends on other parameters
E. none of the above

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