Basic Mechanical Engineering (3110006) MCQs

MCQs of Properties of Steam

Showing 11 to 10 out of 20 Questions
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11.
Steam coming out of the whistle of the pressure cooker is
(a) dry and saturated vapour
(b) wet vapour
(c) superheated vapour
(d) ideal gas
Answer:

Option (b)

12.
Dryness fraction of steam (x) is given by:
(a) msmw
(b) mwms
(c) ms+1mw
(d) msms+mw
Answer:

Option (d)

13.
When dry saturated steam is further heated, its dryness fraction
(a) increase
(b) decrease
(c) remains the same
(d) none of the these
Answer:

Option (c)

14.
Dryness fraction of fully wet steam is
(a) 0
(b) 1
(c) 1.5
(d) none of these
Answer:

Option (a)

15.
Dryness fraction(x) of superheated steam is
(a) equal to 0
(b) greater than 1
(c) less than 1
(d) equal to 1
Answer:

Option (d)

16.
The specific internal energy of dry steam is given by
(a) u=hg+100pVg
(b) u=hg-100pVg
(c) u=100hgpVg
(d) none of these
Answer:

Option (b)

17.

Specific enthalpy of wet steam is

(a)

h=hf+xhfg
(b)

h=hf-xhfg
(c)

h=1+xhf+xhfg
(d)

none of the these
Answer:

Option (a)

18.
Enthalpy of saturated steam is
(a) equal to the enthalpy of wet steam
(b) less than the enthalpy of wet steam
(c) greater than the enthalpy of wet steam
(d) none of the these
Answer:

Option (c)

19.
Dryness of fraction steam can be accurately found with
(a) separating calorimeter
(b) throttling calorimeter
(c) separating and throttling calorimeter
(d) none of the these
Answer:

Option (c)

20.
If x1 and x2 are the dryness fractions obtained in separating calorimeter and throttling calorimeter respectively, then actual dryness fraction of steam is
(a) x1·x2
(b) x1+x22
(c) x1+x2
(d) x1-x2
Answer:

Option (a)

Showing 11 to 10 out of 20 Questions
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