STEAM MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS
STEAM MULTIPLE
CHOICE QUESTIONS
(MCQ) WITH ANSWERS
MCQ help to understand a topic in depth.
It helps in the operation of a steam device.
It helps in trouble shooting.
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Water consumes heat on rise of temperature
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(a) Latent heat
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(b) Enthalpy
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(c) Sensible heat
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(d) None
ANS: ©
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Water consumes heat without rise of temperature
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(a) Latent heat
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(b) Enthalpy
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(c) Sensible heat
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(d) None
ANS(a)
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Dryness fraction of dry saturated steam on heating
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(a) Increase
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(b) Decreases
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(c) Remains same
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(d) None
ANS: ©
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Water at atmospheric pressure is a
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(a) Ideal gas
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(b) Far below the critical temperature
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(c) Far above the critical temperature
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(d) None
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ANS: (b)
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The latent heat of steam at the atmospheric pressure is
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(a) 2157 k J/kg
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(b) 2257 k J/kg
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(c)2457 k J/kg
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(d) None
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ANS: (b)
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Volume of steam is approximately
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(a) 600 times that of water
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(b) 800 times that of water
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(c) 1000 times that of water
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(d) None
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ANS: (b)
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Internal energy is with respect to
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(a) Constant pressure
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(b) Constant volume
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(c) Constant temperature
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(d) None
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ANS: (b)
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Sensible heat of water up to 1000C
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(a) > the latent heat of steam
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(b) < the latent heat of steam
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(c) = to the latent heat of steam
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(d) None
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ANS:(b)
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Critical temperature and critical pressure of steam is
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(a) 2 0C and 374.15 Bar
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(b) 15 0C and 374.15 bar
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(c) 15 0C and 221
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(d) None
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ANS: (c)
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With the increase of pressure, the boiling point of water
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(a) Increases
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(b) Decreases
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(c) No change
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(d) None
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ANS: (a)
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Specific internal energy of dry steam equals
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(a) u= h g + 100 p v g
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(b) u = h g – 100 p v g
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(c) u = 100 h g/p v g
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(d) None
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ANS: (b)
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What is effect of increase of pressure on the enthalpy of steam
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(a) Increases
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(b) Decreases
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(c) Remains same
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(d) None
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ANS: (b)
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Dryness fraction of steam is equal to
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(a) m water/(m water + m dry steam)
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(b) m dry steam/ (m water + m dry steam)
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(c) (m water + m dry steam)/ m dry steam
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(d) None
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ANS: (b)
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Specific enthalpy of wet steam is
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(a) h= h water + x h steam
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(b) h = h water — x h steam
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(c) h= (1—x) h water + x h steam
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(d) None
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ANS: ©
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Effect of increase of pressure on the specific volume of water is
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(a) Increases
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(b) Decreases
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(c) Remains the same
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(d) None
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ANS: ©
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Measure more accurate dryness fraction of steam with
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(a) Separating Calorimeter
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(b) Throttling Calorimeter
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(c) Separating and throttling Calorimeter
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(d) None
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ANS: ©
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Saturation temperature of water at 2 atm is
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(a) 120 0 C
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(b) 110 0 C
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(c) 100 0 C
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(d) None
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ANS: (a)
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Super-heating of steam consumes
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(a) Latent heat
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(b) Sensible heat
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(c) Sensible and latent heat
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(d) None
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ANS: (b)
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The dryness fraction of super-heated steam is
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(a) =1
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(b) <1
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(c) >1
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(d) None
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ANS: (a)
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Enthalpy of dry saturated steam is
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(a) = to the enthalpy of wet steam
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(b) < the enthalpy of wet steam
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(c) > the enthalpy of wet steam
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(d) None
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ANS: ©
21. Boiling point of water at 2 bar is
(a) 1000C
(b) 1100C
(c) 1200C
(d) None
Ans: (c)
22. The triple point temperature of water is
(a) -56.20C
(b) 0.010C
(c) 374.150C
(d) None
Ans: (b)
23. The critical temperature of water is
(a) -56.20C
(b) 0.010C
(c) 374.150C
(d) None
Ans: (c)
24. The critical pressure of water is
(a) 7.38 MPa
(b) 22.12 MPa
(c) 5.04 MPa
(d) None
Ans: (b)
25. The triple point pressure of water is
(a) 611.2 Pa
(b) 611.2 MPa
(c) 611.2 kPa
(d) None
Ans: (c)
26. The latent heat of fusion of ice is
(a) 2257 kJ/kg
(b) 335 kJ/kg
(c) 535 kJ/kg
(d) None
Ans: (b)
27. The latent heat of vaporization of water is
(a) 2257 kJ/kg
(b) 335 kJ/kg
(c) 535 kJ/kg
(d) None
Ans: (a)
28. What is degree of super-heat?
(a) The temperature above the freezing point
The temperature above the boiling point
(c) The temperature above 00C
(d) None
Ans: (b)
29. Dryness fraction is
(a) Ratio of mass of water present to mass of water-steam mixture
(b) Ratio of mass of vapor present to mass of water-steam mixture
(c) Amount of vapor present to the mass of water
(d) None
Ans: (b)
30. Sensible heat of water is
(a) m Cp dt
(b) m hfg
(c) m cv dt
(d) None
Ans: (a)
31. Addition of heat due to super-heating is
(a) m c pv (t steam–0)
(b) m c pv (t steam–t saturation)
(c) m hfg
(d) None
Ans: (b)
32. Entropy of water at 100C will be
(a) cp ln (10/100)
(b) cp ln (273/283)
(c) cp ln (283/273)
(d) None
Ans: (c)
33. Entropy of vaporization is
(a) 100/h fg
(b) h fg/T satu
(c) 2257/1000C
(d) None
Ans: (b)
34. Represent a throttling process on the enthalpy entropy chart by a
(a) Horizontal line
(b) Vertical line
(c) Inclined line
(d) None
Ans: (a)
35. Represent a reversible adiabatic process on the enthalpy entropy
chart by a
(a) Horizontal line
(b) Vertical line
(c) Inclined line
(d) None
Ans: (b)
36. The specific enthalpy of water at 500C will be
(a) 50 kJ
(b) 105 kJ
(c) 210 kJ
(d) None
Ans: (c)
37. The specific enthalpy of water at 10 bar and at 500C will be
(a) 50 kJ
(b) 105 kJ
(c) 210 kJ
(d) None
Ans: (c)
38. The boiling temperature of water
(a) Increases with the decrease of pressure
(b) Decreases with the decrease of pressure
(c) remains constant with the change of pressure
(d) None
Ans: (b)
39. The boiling temperature of Freon -22
(a) Increases with the decrease of pressure
(b) Decreases with the decrease of pressure
(c) remains constant with the change of pressure
(d) None
Ans: (b)
40. The latent heat of vaporization of water decreases with the
(a) Increase of pressure
(b) Decrease of boiling temperature
(c) Decrease of pressure
(d) None
Ans: (a)
41. The specific enthalpy of saturated steam decreases with the
(a) Increase of pressure
(b) Decrease of boiling temperature
(c) Decrease of pressure
(d) None
Ans: (c)
42. Volume of water on heating above 0 0C
(a) Increases
(b) Decreases
(c) Does not change at all
(d) none
Ans: (b)
43. Measure the high dryness fraction of wet steam with the help of a
(a) Separating Calorimeter
(b) Throttling Calorimeter
Combined separating and Throttling Calorimeter
(d) none
Ans: (b)
44. The phase change from liquid to vapor is
(a) Drop wise Condensation
(b) Sublimation
(c) Film wise condensation
(d) None
Ans: (d)
45. Steam is a
(a) Gas
(b) Vapor
(c) gas and vapor
(d) None
Ans: (b)
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