Engineering Thermodynamics (3131905) MCQs

MCQs of Second Law of Thermodynamics

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1.

According to Kelvin-Planck's statement of the second law of thermodynamics

(a)

it is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
(b)

it is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
(c)

it is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
(d)

none of these
Answer:

Option (a)

2.

Which of the following statement is correct according to Clausius statement of the second law of thermodynamics?

(a)

It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature
(b)

It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source
(c)

Heat can be transfer itself from low temperature to high temperature
(d)

None of these
Answer:

Option (b)

3.

According to the Carnot corollary-I

(a)

all the reversible engines have the same efficiency for a given fixed temperatures limit
(b)

all the reversible and irreversible engines have the same efficiency
(c)

irreversible engines have maximum efficiency
(d)

all the reversible engines are less efficient than irreversible engines
Answer:

Option (a)

4.

COP of the refrigerator is the ratio of

(a)

refrigerating effect to work input by the compressor
(b)

work input by the compressor to the heating effect
(c)

work output to the heat supplied
(d)

heating effect to work input by the compressor
Answer:

Option (a)

5.

The efficiency of any reversible heat engine operating between two thermal reservoirs is independent of the nature of working fluid and depends only on the temperature of thermal reservoirs is known as

(a)

Clausius inequality
(b)

Clausius theorem
(c)

Clausius statement of 2nd law of thermodynamics
(d)

Carnot corollary-II
Answer:

Option (d)

6.

One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to

(a)

800 K
(b)

1000 K
(c)

1200 K
(d)

1400 K
Answer:

Option (a)

7.

Which of the following is the correct statement?

(a)

All the reversible engines have the same efficiency for a given fixed temperature limit
(b)

All the reversible and irreversible engines have the same efficiency.
(c)

Irreversible engines have maximum efficiency.
(d)

All engines are designed as reversible in order to obtain maximum efficiency.
Answer:

Option (a)

8.

The throttling process is __________ process.

(a)

reversible
(b)

irreversible
(c)

reversible or irreversible
(d)

none of these
Answer:

Option (b)

9.

For thermodymic process to be reversible, the temperature difference between hot body and working substance should be

(a)

zero
(b)

minimum
(c)

maximum
(d)

infinity
Answer:

Option (a)

10.

For maximum work, the process must be entirely

(a)

irreversible
(b)

reversible
(c)

adiabatic
(d)

none of the mentioned
Answer:

Option (b)

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