Engineering :: Thermodynamics
51.
The internal energy of a substance depdnds on
A.
Temperature
B.
Pressure
C.
Volume
D.
Entropy
E.
Velocity
Answer: Option A
Explanation:
52.
At critical point the enthalpy of vaporisation is
A.
Only dependent on temperature
B.
Zero
C.
Maximum
D.
Minimum
E.
None of the above
Answer: Option B
Explanation:
53.
The value of the product of molecular weight and the gas characteristic constant for all gases in kgf m/1 kg mol ?K is
Answer: Option C
Explanation:
54.
For a reversible adiabatic process the change in entropy is
A.
Zero
B.
Minimum
C.
Maximum
D.
Infinite
E.
Unity
Answer: Option A
Explanation:
55.
For any reversible process, the change in entropy of the system and surroundings is
A.
Zero
B.
Unity
C.
Negative
D.
Positive
E.
Infinite
Answer: Option A
Explanation:
56.
For any irreversible process the net entropy change is
A.
Zero
B.
Positive
C.
Negative
D.
Infinite
E.
Unity
Answer: Option B
Explanation:
57.
In the above problem work done is equal to
A.
180 kcal
B.
130 kcal
C.
150 kcal
D.
100 kcal
E.
80 kcal
Answer: Option E
Explanation:
58.
The efficiency of cycle would be
A.
100 percent
B.
88.8 percent
C.
78.3 percent
D.
66.7 percent
E.
37.7 percent
Answer: Option D
Explanation:
59.
In an isothermal process
A.
Temperature increases gradually
B.
Volume remains constant
C.
Pressure remains constant
D.
Enthalpy change is maximum
E.
Change in internal energy is zero
Answer: Option E
Explanation:
60.
Which of the following is incorrect?
A.
The pressure of a mixture of gases is equal to the sum of the pressure of the individual components taken each at the temperature and volume of the mixture
B.
The entropy of a mixture of gases is equal to the sum of the entropies of the individual components taken each at the temperature and volume of the mixture
C.
The internal energy of a mixture of gases is equal to the sum f the internal energies of the indicudual components taken each at the temperature and the volume of the mixture
D.
(B) and (C) above
E.
None of the above
Answer: Option E
Explanation:
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