A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is
A. 54°C
B. 327°C
C. 108°C
D. 654°C
Answer: Option B
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B. Raising its pressure
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D. Raising its temperature and doing external work
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A. Heat
B. Work
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D. Thermal conductivity
An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is
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The absolute zero pressure can be attained at a temperature of
A. 0°C
B. -273°C
C. 273 K
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By Mayer's formula , we have
CP−CV =R
Where C and CV are the molar specific heats of gas at constant pressure and constant volume respectively.
V1/T1=V2/T2
T2=?
V1/27+273=2V1/T2
T2=2*300=600 K
T2=327 C
From ideal equation PV=MRT P=MRT/V
P=contact
MRT1/v1 =MRT2/v2
V1=V ,V2=2V, T1= 300K
300/V=T2/2v
T2=600K
T2 = 327°
T=27+273
V/T=2V/T
1/300=2/T
T=600K
T=327C
V1/T1=V2/T2
T2=?
V1/27+273=2V1/T2
T2=2*300=600 K
T2=327 C