Multiple Choice Questions on Steam Boilers

Multiple Choice Questions on Steam Boilers

1- The ratio of heat utilized in steam generation and the heat generated in furnace is known as

(A) Boiler effectiveness

(B) Boiler evaporative capacity

(C) Boiler efficiency

(D) None of the above


2- The minimum thickness of boiler plate shall not be less than _______

(A) 8.0 mm

(B) 12.0 mm

(C) 10.0 mm

(D) 6.35 mm


3- Which of the following ash is suitable for selling?

(A) Clinkers

(B) Fly Ash

(C) Synthetic Gypsum

(D) Bed Ash


4- Which of the given boilers operate above critical pressure?

(A) Natural circulation boilers

(B) Forced circulation boilers

(C) Once-through boilers

(D) Water tube boilers


5- Deposits of calcium and magnesium carbonates on the boiler heating surface cause

(A) Scale

(B) Corrosion

(C) Improved heat transfer rate

(D) None of the above


6- Boiler plates and staybolts are subjected to _______ stress

(A) Shear

(B) Compressive

(C) Torsion

(D) Tensile


7- Which one of the following modes of heat transfer would take place predominantly from boiler furnace to water wall?

(A) Convection

(B) Conduction

(C) Radiation

(D) Conduction and convection


8- Bomb calorimeter is used to find the calorific value of _______ fuels.

(A) solid

(B) gaseous

(C) solid and gaseous

(D) none of the above


9- In a boiler, various heat losses take place. The biggest loss is due to

(A) moisture in fuel

(B) dry flue gases

(C) steam formation

(D) unburnt carbon


10- Which of the following boiler water treatment ensures complete removal of salts?

(A) Demineralization

(B) Softening

(C) De-aeration

(D) All of the above



1-(C), 2-(D), 3-(B), 4-(C), 5-(A), 6-(D), 7-(C), 8-(A), 9-(B), 10-(A)