11-The primary reason to add limestone with coal Fluidized bed combustion boiler is
(A) To lower the furnace temperature
(B) To increase the thermal efficiency
(C) To absorb SO2
(D) None of the above
12-Steam power plant operates on
(A) Carnot cycle
(B) Brayton cycle
(C) Rankine cycle
(D) Sterling cycle
13-What does the turbidity in boiler feed water cause?
(A) Sludge
(B) Scale
(C) Corrosion
(D) Erosion
14-The quantity of which boiler mounting is kept as more than one ?
(A) Water level indicator
(B) Safety valve
(C) Fusible plug
(D) Both (A) & (B)
15-In water wall furnace the heat is transferred to the water wall by
(A) Convection
(B) Radiation
(C) Radiation and convection
(D) Radiation and conduction
16-Which of the following group of devices is used for part recovery of heat from the flue through gases leaving the tube banks in a water tube boiler?
(A) Drum internals, Superheaters, Economizer
(B) Economizer, Air preheater, Electrostatic preheater
(C) Water wall, Drum internals, Superheaters
(D) Superheaters, Economizer, Air Preheater
17-Following is the advantage of supercritical boilers
(A) Reduction in emission
(B) More cycle efficiency
(C) Requires no latent heat addition
(D) All of the above
18-Steam is preferred medium for heating applications because:
(A) High latent heat
(B) Temperature break down is easy
(C) Easy to control and distribute
(D) All of the above
19-Which of the following device is termed as boiler accessory
(A) Safety valve
(B) Relief valve
(C) Steam Stop valve
(D) Super heater
20-The following boiler is considered to be as most combustion efficient?
(A) Fluidized bed combustion boiler
(B) Lancashire boiler
(C) Stoker fired boiler
(D) Chain grate boiler
ANSWERS:
11-(C), 12-(C), 13-(A), 14-(D), 15-(B), 16-(D), 17-(D), 18-(D), 19-(D), 20-(A)
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