MCQ on Boiler

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)