Engineering :: Thermodynamics
71.
In which case the work done per kg of air compressed from 1.05 ata, 15?C to 6.3 ata is minimum
A.
Adiabatic
B.
Isothermal
C.
Polytropic pv1.3 = C
D.
Polytropic pv1.35 = C
E.
Polytropic pv1.4 = C
Answer: Option B
Explanation:
72.
In which case the heat transferred from the air when compressed from 1.05 ata 15?C to 6.3 ata would be minimum?
A.
Adiabatic
B.
Isothermal
C.
Polytropic pv1.3 = C
D.
Polytropic pv1.31 = C
E.
Polytropic pv1.35 = C
Answer: Option A
Explanation:
73.
In which case the heat transferred from the air when compressed from 1 ata 15?C to 6 ata would be maximum
A.
Adiabatic
B.
Isothermal
C.
Polytropic pv1.3 = C
D.
Polytropic pv1.31 = C
E.
Polytropic pv1.35 = C
Answer: Option A
Explanation:
74.
The value of characteristic gas constant in kg metre per kg per deg C as
Answer: Option C
Explanation:
75.
The molecular volume of all the gases at 2 ata and 30?C is
A.
1.0 cm-m
B.
1.562 cu-m
C.
8.48 cu-m
D.
12.847 cu-m
E.
25.794 cu-m
Answer: Option D
Explanation:
76.
The value of characteristic gas constant for carbon dioxide would be
A.
29.2 kg/metre/kg/?K
B.
30.4 kg/metre/kg/?K
C.
19.28 kg/metre/kg/?K
D.
16.1 kg/metre/kg/?K
E.
10.0 kg/metre/kg/?K
Answer: Option C
Explanation:
77.
If the two specific heats of a gas are 0.237 and 0.169 respectively, the volume of 3 kg of air at 27?C under a pressure of 3 ata would be
A.
0.204 cu-m
B.
1 cu-m
C.
1.5 cu-m
D.
1.74 cu-m
E.
2.5 cu-m
Answer: Option A
Explanation:
78.
The weight of 1 cu-m of carbon dioxide at NTP if the characteristic gas constant is 19.28 kg metre/kg/?C, would be
A.
1 kg
B.
1.5 kg
C.
1.962 kg
D.
2.5 kg
E.
3.924 kg
Answer: Option C
Explanation:
79.
1 cu-m of steam having dryness franction 0.85 at 12 ata mixes with 1.5 kg of water at 12?C at constant pressure. The dryness fraction of resulting steam would be
Answer: Option C
Explanation:
80.
A Carnot refrigerator extracts 100 kcal of heat per minute from a cold room which is maintained at - 15?C and it is discharged to atmosphere at 30?C. The horse power required to run the unit would be
A.
1
B.
1.5 to 2
C.
2 to 5
D.
5 to 6
E.
Mone than 6
Answer: Option B
Explanation:
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