41. The state of vapour under saturation condition is described by
(a) pressure alone
(b) temperature alone
(c) pressure and temperature
(d) pressure and dryness fraction
(e) dryness fraction alone.
Ans: d
42. Pick up the wrong statement about critical condition of steam
(a) latent heat is zero
(b) liquid directly becomes steam
(c) specific volume of steam and liquid is same
(d) this is the maximum pressure limit
(e) all properties of liquid and steam are same.
Ans: d
43. Water boils when its vapour pressure
(a) equals that of the surroundings
(b) equals 760 mm of mercury
(c) equals to atmospheric pressure
(d) equals the pressure of water in the con-tainer
(e) boiling has ^nothing to do with vapour pressure.
Ans: a
45. Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to
(a) 421 kgm
(b) 421 kgm
(c) 539 kgm
(d) 102 kgm
(e) 75 kgm.
Ans: a
46. Equivalent evaporation of water is the evaporation "for a feed water supply at 100°C
(a) and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2
(b) and its corresponding conversion into dry steam at desired boiler pressure
(c) conversion into steam at atmospheric condition
(d) conversion into steam at the same pres-sure at which feed water is supplied
(e) none of the above.
Ans: a
47. The evaporation of 15.653 kg of water per hour from and at 100°C is called
(a) evaporative capacity
(b) factor of evaporation
(c) equivalent evaporation
(d) one boiler h.p.
(e) boiler efficiency.
Ans: d
48. The increase in pressure
(a) lowers the boiling point of a liquid
(b) raises the boiling point of a liquid
(c) .does not affect the boiling point of a liquid
(d) reduces its volume
(e) none of the above.
Ans: b
49. During polytropic process
(a) heat transfer takes place across cylinder walls
(b) work is done
(c) steam may be wet, dry or superheated after expansion
(d) all of the above
(e) none of the above.
Ans: d
50. Hygrometery deals with the
(a) Hygroscopic substances
(b) water vapour in air
(c) temperature of air
(d) pressure of air
(e) density measurement.
Ans: b
(a) pressure alone
(b) temperature alone
(c) pressure and temperature
(d) pressure and dryness fraction
(e) dryness fraction alone.
Ans: d
42. Pick up the wrong statement about critical condition of steam
(a) latent heat is zero
(b) liquid directly becomes steam
(c) specific volume of steam and liquid is same
(d) this is the maximum pressure limit
(e) all properties of liquid and steam are same.
Ans: d
43. Water boils when its vapour pressure
(a) equals that of the surroundings
(b) equals 760 mm of mercury
(c) equals to atmospheric pressure
(d) equals the pressure of water in the con-tainer
(e) boiling has ^nothing to do with vapour pressure.
Ans: a
45. Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to
(a) 421 kgm
(b) 421 kgm
(c) 539 kgm
(d) 102 kgm
(e) 75 kgm.
Ans: a
46. Equivalent evaporation of water is the evaporation "for a feed water supply at 100°C
(a) and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2
(b) and its corresponding conversion into dry steam at desired boiler pressure
(c) conversion into steam at atmospheric condition
(d) conversion into steam at the same pres-sure at which feed water is supplied
(e) none of the above.
Ans: a
47. The evaporation of 15.653 kg of water per hour from and at 100°C is called
(a) evaporative capacity
(b) factor of evaporation
(c) equivalent evaporation
(d) one boiler h.p.
(e) boiler efficiency.
Ans: d
48. The increase in pressure
(a) lowers the boiling point of a liquid
(b) raises the boiling point of a liquid
(c) .does not affect the boiling point of a liquid
(d) reduces its volume
(e) none of the above.
Ans: b
49. During polytropic process
(a) heat transfer takes place across cylinder walls
(b) work is done
(c) steam may be wet, dry or superheated after expansion
(d) all of the above
(e) none of the above.
Ans: d
50. Hygrometery deals with the
(a) Hygroscopic substances
(b) water vapour in air
(c) temperature of air
(d) pressure of air
(e) density measurement.
Ans: b
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