Steam Boilers

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

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

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

A. dry
B. wet
C. saturated
D. supersaturated
E. superheated

A. remain unaffected
B. improve C. worsen
C. may improve/worsen depending on size
D. unpredictable

A. supply of excess, air
B. supply of excess coal
C. burning CO and unburnts in upper zone of furnace by supplying more air
D. fuel bed firing
E. none of the above

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

A. increases
B. decreases
C. remains unaffected
D. first increases and then decreases
E. first decreases and then increases

A. increases
B. decreases
C. remains constant
D. may increase or decrease depending upon the method of storage
E. none of the above

A. very low pressure
B. atmospheric pressures
C. medium pressures
D. very high pressures
E. none of the above