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
The three “Ts” for good combustion are :
A. temperature, time, and turbulence
B. total air, true fuel
C. thorough mixing, total air
D. total air, time, and temperature
E. none of the above
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
E. unpredictable
Feed water conditioning in thermal power plants in done to :
A. reduce hardness and for removal of solids
B. increase efficiency-of thermal power plant
C. increase *heat transfer rate
D. increase steam parameters
E. all of the above
Boiler parameters are expressed by :
A. tonnes/hr. of steam
B. pressure of steam in kg/cm2
C. temperature of steam in °C
D. all of the above
E. none of the above
Calorific value of coal is of the order of :
A. 200-400 kcal/kg
B. 800-1200 kcal/kg
C. 2000-4000 kcal/kg
D. 5000-8000 kcal/kg
E. 8000-10,000 kcal/kg
The condition of steam in boiler drum is always :
A. dry
B. wet
C. saturated
D. supersaturated
E. superheated
Deaeration 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
Deaeration 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
During storage, the heating value of coal :
A. increases
B. decreases
C. remains constant
D. may increase or decrease
E. none of the above
