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Thermodynamics - Section 1 (5)

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Thermodynamics - Section 1

33. 

The entropy __________ in an irreversible cyclic process.

A. remains constant
B. decreases
C. increases

Answer: Option C

Explanation:

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34. 

The efficiency of Diesel cycle approaches to Otto cycle efficiency when

A. cut-off is increased
B. cut-off is decreased
C. cut-off is zero
D. cut-off is constant

Answer: Option C

Explanation:

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35. 

The most probable velocity of the gas molecules is given by

A. 247-163-1
B. 247-163-2
C. 247-163-3
D. 247-163-4

Answer: Option B

Explanation:

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36. 

The compression ratio for petrol engines is

A. 3 to 6
B. 5 to 8
C. 15 to 20
D. 20 to 30

Answer: Option B

Explanation:

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37. 

The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas.

A. one-half
B. one-third
C. two-third
D. three-fourth

Answer: Option C

Explanation:

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38. 

Workdone in a free expansion process is

A. zero
B. minimum
C. maximum
D. positive

Answer: Option A

Explanation:

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39. 

Which of the following has the minimum atomic mass?

A. Oxygen
B. Sulphur
C. Nitrogen
D. Carbon

Answer: Option D

Explanation:

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40. 

The processes occuring in open system which permit the transfer of mass to and from the system, are known as

A. flow processes
B. non-flow processes
C. adiabatic processes
D. none of these

Answer: Option A

Explanation:

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