Steam Boilers and Engines MCQ with Answers

Steam Boilers and Engines MCQ with Answers

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

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)

Answer is:

(176.5H)/(T1)

193) An air preheater

Answer is:

all of the above

194) A condenser in a steam power plant

Answer is:

all of these

Explanation:

A condenser in a steam power plant
* increases expansion ratio of steam
* reduces back pressure of steam
* reduces temperature of exhaust steam

195) The amount of water evaporated in kg per kg of fuel burnt is called

Answer is:

evaporative capacity of a boiler

Explanation:

The performance of a steam boiler is measured in terms of its evaporative capacity. The evaporative capacity of a boiler is the amount of water evaporated or steam produced in kg/h. It may also be expressed in kg/kg of fuel burnt or kg/h/m² of heating surface.

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