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Steam Boilers - Interview Questions and Answers

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91. Film boiling occurs at
A. very low pressure
B. atmospheric pressures
C. medium pressures
D. very high pressures
E. none of the above.
Explanation:
92. Relative percentage of heat absorbed through the heat transfer of (i) furnace water wall, (ii) boiler bank, (Hi) superheated, (iv) economizer, (v) air heater of a typical boiler of 200 MW capacity would be of the order of
A. 48:20:15:7:10
B. 10:7:15:20:48
C. 20:48:7:15:10
D. 7:15:20:10:48
E. 48:15:10:7:20.
Explanation:
93. The size of a boiler drum in pulverized 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.
Explanation:
94. The condition of steam in boiler drum is always
A. dry
B. wet
C. saturated
D. supersaturated
E. superheated.
Explanation:
95. 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.
Explanation: