Mechanical Engineering - Steam Boilers and Engines

41.
The factor of evaporation for all boilers is always
equal to unity
less than unity
greater than unity
Answer: Option
Explanation:
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42.
The ratio of the actual vacuum to the ideal vacuum in a condenser is called
condenser efficiency
vacuum efficiency
nozzle efficiency
boiler efficiency
Answer: Option
Explanation:
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43.
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: Option
Explanation:
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44.
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: Option
Explanation:
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45.
A condenser in a steam power plant
increases expansion ratio of steam
reduces back pressure of steam
reduces temperature of exhaust steam
all of these
Answer: Option
Explanation:
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