Steam Boilers, Engines, Nozzles and Turbines

 Mechanical Engineering Multiple choice Questions Answers

“Steam Boilers, Engines, Nozzles and Turbines”

Mechanical Engineering MCQS

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Steam Boilers, Engines, Nozzles and Turbines Questions Answers

1. For water, at pressures below atmospheric,
   (a) melting point rises slightly and boiling point drops markedly
   (b) melting point rises markedly and boiling point drops markedly
   (c) melting point drops slightly and boiling point drops markedly
   (d) melting point drops slightly and boiling point drops slightly
   (e) none of the above.
   Ans: a
2. At very low temperature, the melting and boiling temperatures become equal. This temperature is
   (a) 373°K
   (b) 273.16°K
   (c) 303°K
   (d) 0°K.
   (e) 300°K.
   Ans: b
3. The critical pressure at which latent heat of vaporisation is zero is
   (a) 225.65 kgf/cm2
   (b) 273 kgf/cm2
   (c) 100 kgf/cm2
   (d) 1 kgf/cm2
   (e) – 1 kgf/cm2.
   Ans: a
4. The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is
   (a) less
   (b) more
   (c) equal
   (d) may be less or more depending on temperature
   (e) unpredictable.
   Ans: a

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199. Feed water conditioning in thermal power plants in done to
(a) reduce hardness and for removal of solids
(b) increase efficiency-of thermal power plant
(c) increase *heat transfer rate
(d) increase steam parameters
(e) all of the above.
Ans: a

200. The basic job of feed water treatment in boilers is to overcome the problem of
(a) corrosion
(b) scale
(c) carryover
(d) embrittlement
(e) all of the above.
Ans: e

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