The condition of steam in boiler drum is always ___________________?
A. dry
B. wet
C. saturated
D. supersaturated
E. superheated
Month: January 2019
In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?
In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?
A. remain unaffected
B. improve C. worsen
C. may improve/worsen depending on size
D. unpredictable
Overfire burning is the phenomenon of _____________________?
Overfire burning is the phenomenon of _____________________?
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
Deaeration of feed water is carried out because it reduces ____________________?
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
Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler _________________?
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
During storage, the heating value of coal __________________?
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
Film boling occurs at _______________________?
Film boling occurs at _______________________?
A. very low pressure
B. atmospheric pressures
C. medium pressures
D. very high pressures
E. none of the above
For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?
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
The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?
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
The basic job of feed water treatment in boilers is to overcome the problem of __________________?
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