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Engineering
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ME Set-1
Steam Boilers and Engines
189

Steam Boilers and Engines MCQ with Answers

189) A device used to heat feed water by utilising the heat in me exhaust flue gases before leaving through the chimny, is known as

economiser

fusible plug

superheater

stop valve

Answer is:

economiser

A device used to heat feed water by utilising the heat in me exhaust flue gases before leaving through the chimny, is known as

Steam Boilers and Engines MCQ with Answers

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Related Steam Boilers and Engines MCQ with Answers

190) The factor of evaporation for all boilers is always

equal to unity

less than unity

greater than unity

none of these

Answer is:

greater than unity

191) The ratio of the actual vacuum to the ideal vacuum in a condenser is called

condenser efficiency

vacuum efficiency

nozzle efficiency

boiler efficiency

Answer is:

vacuum efficiency

192) The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height ot the chimney in metres, and T₁ = Absolute temperature of air outside the chimney in K)

(T1)/(88.25H)

(88.25H)/(T1)

(T1)/(176.5H)

(176.5H)/(T1)

Answer is:

(176.5H)/(T1)

193) An air preheater

increases evaporative capacity of the boiler

increases the efficiency of the boiler

enables low grade fuel to be burnt

all of the above

Answer is:

all of the above

Steam Boilers and Engines MCQ with Answers

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