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This mock test of Test: Entropy - 2 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam.
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QUESTION: 1

The relation, TdS = dU + PdV, is valid for

Solution:

TdS= dU + PdV

This equation holds good for any process reversible or irreversible, undergone by a closed system, since it is a relation among properties which are independent of the path.

QUESTION: 2

The equation, δQ = dU + PdV, is true for

Solution:

QUESTION: 3

In statistical thermodynamics, entropy is defined as

1. measure of irreversibility of a system

2. a universal property

3. degree of randomness

4. thermodynamic probability of disorderness

Which of the above is/are correct

Solution:

QUESTION: 4

Energy tends over to gravitate to a lower degree of intensity so long as it undergoes no transformation.

Which law of thermodynamics is related to this statement

Solution:

QUESTION: 5

Consider the following statements:

In an irreversible process

1. entropy always increases

2. the sum of the entropy of all bodies taking part in a process always increases

3. once created, entropy can not be destroyed

Which among the above are correct?

Solution:

a) An irreversible process increases the entropy of the universe. Because entropy is a state function, the change in entropy of the system is the same, whether the process is reversible or irreversible.

b) The total entropy of a system either increases or remains constant; it never decreases. Entropy is zero in a reversible process; it increases in an irreversible process.

c) Once some entropy is created in a process , the universe has to carry the burden of that entropy forever .

QUESTION: 6

One kg of water at room temperature is brought into contact with a high temperature thermal reservoir. The entropy change of the universe is

Solution:

QUESTION: 7

For a thermodynamics cycle to be irreversible, it is necessary that

Solution:

Hence,

⇒For cycle is possible This is known as Clausius inequality.

QUESTION: 8

Match List-I with List-ll and select the correct answer using the codes given below

List-I

A. Mechanical work

B.

C. Zeroth law

D. H - TS

List-II

1. Clausius-Clapeyron equation

2. Gibb’s equation

3. High grade energy

4. Concept of temperature

Solution:

Gibbs function

G = H - TS

• Mechanical work is high grade energy

• Zeroth law gives the concept of temperature

• is known as Clausius inequality

QUESTION: 9

Increase in entropy of a system represents

Solution:

Increase in entropy of a system leads to increase in randomness and degradation of energy.

QUESTION: 10

For reversible adiabatic process, change in entropy is

Solution:

For reversible adiabatic process

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