Steam Boilers

11. Adiabatic process is

  1. essentially an isentropic process
  2. non-heat transfer process
  3. reversible process
  4. constant temperature process
  5. constant enthalpy process.

Correct answer: (B)
non-heat transfer process

12. Alkaline pyrogallate is used in Orsat’s apparatus for absorption of

  1. C02
  2. CO
  3. 2
  4. N2
  5. none of the above.

Correct answer: (C)
2

13. An economiser in a boiler

  1. increases steam pressure
  2. increases steam flow
  3. decreases fuel consumption
  4. decreases steam pressure
  5. increases life of boiler.

Correct answer: (C)
decreases fuel consumption

14. An ideal regenerative cycle is

  1. equal to carnot cycle
  2. less than carnot cycle
  3. more than carnot cycle
  4. could be anything
  5. none of the above.

Correct answer: (B)
less than carnot cycle

15. At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is

  1. maximum
  2. minimum
  3. zero
  4. depends on temperature also
  5. none of the above.

Correct answer: (C)
zero

16. At very low temperature, the melting and boiling temperatures become equal. This temperature is

  1. 373°K
  2. 273.16°K
  3. 303°K
  4. 0°K.
  5. 300°K.

Correct answer: (B)
273.16°K

17. At which pressure the properties of water and steam become identical

  1. 0.1 kg/cm2
  2. 1 kg/cm2
  3. 100 kg/cm2
  4. 225.6 kg/cm2
  5. it is never possible.

Correct answer: (D)
225.6 kg/cm2

18. Boiler H.P. is defined as the

  1. steam evaporation rate per kg of fuel fired
  2. work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam
  3. the evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam
  4. work done by 1 kg of steam at saturation condition
  5. heat consumed in evaporating 1 kg water at 0°C to steam at 100°C and 1.033 kg/cm pressure.

Correct answer: (C)
the evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam

19. Boiler parameters are expressed by

  1. tonnes/hr. of steam
  2. pressure of steam in kg/cm2
  3. temperature of steam in °C
  4. all of the above
  5. none of the above.

Correct answer: (D)
all of the above

20. Boiler stays are used to

  1. prevent flat surfaces under pressure from tearing apart
  2. take care of failure in shear
  3. take care of failure in compression
  4. provide support for boiler
  5. provide foundation of boiler.

Correct answer: (A)
prevent flat surfaces under pressure from tearing apart

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