Film boiling occurs at :
A. very low pressure
B. atmospheric pressures
C. medium pressures
D. very high pressures
E. none of the above
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
In water wall furnace, the heat is transferred to the water-walls by :
A. convection
B. radiation
C. conduction
D. radiation and conduction
E. radiation and convection
Fire tube boilers are limited to a maximum design working pressure of :
A. 1 kg/cm
B. 6 kg/cm
C. 17 kg/cm2
D. 100 kg/cm2
E. 250 kg/cm2
The steam temperature with increase in load in case of a boiler fitted with radiation super heater :
A. increases
B. decreases
C. remains unaffected
D. first increases and then decreases
E. unpredictable
Maximum energy loss in a boiler occurs due to :
A. unburnt carbon in ash
B. incomplete combustion
C. ash content
D. flue gases
E. radiation losses
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
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
Pulverized fuel is used for :
A. better burning
B. more calorific value
C. less radiation loss
D. medium sized units
E. stoker fired boilers
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
E. measuring oxygen in flue gases
