101. Film boiling occurs at _______________________?
A. very low pressure
B. atmospheric pressures
C. medium pressures
D. very high pressures
E. none of the above

102. During storage, the heating value of coal __________________?
A. increases
B. decreases
C. remains constant
D. may increase or decrease depending upon the method of storage
E. none of the above

103. Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler _________________?
A. increases
B. decreases
C. remains unaffected
D. first increases and then decreases
E. first decreases and then increases

104. Reaeration of feed water is carried out because it reduces ____________________?
A. cavitation of .boiler feed pumps
B. corrosion caused by oxygen
C. heat transfer coefficient
D. pH value of water
E. weight of water to be handled

105. Over fire burning is the phenomenon of _____________________?
A. supply of excess, air
B. supply of excess coal
C. burning CO and unburnt in upper zone of furnace by supplying more air
D. fuel bed firing
E. none of the above

106. Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value ___________________?
A. (1- moisture content)
B. (1 + moisture content)
C. 1 + moisture content
D. 1 – moisture content

107. Incomplete combustion can be best judged by__________________?
A. smoky chimney exit
B. excess air in flue gases
C. measuring carbon mono-oxide in flue gases
D. measuring temperature of flue gases at exit of furnace
E. measuring oxygen in flue gases

108. Pulverized fuel is used for___________________?
A. better burning
B. more calorific value
C. less radiation loss
D. medium sized units
E. stoker fired boilers

109. Evaporative capacity of boiler is expressed as____________________?
A. kg of steam produced
B. steam pressure produced
C. kg of fuel fired
D. kg of steam produced per kg of fuel fifed
E. kg of water evaporated

110. The balanced draft furnace is one using _________________________?
A. induced draft fan and chimney
B. induced draft fan and forced draft fan
C. forced draft fan and chimney
D. any one of the above
E. none of the above

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