Free Printable Entropy Section 1

1.

Which of the following is true?

a)

for an isolated system, dS>=0

b)

for a reversible process, dS=0

c)

for an irreversible process, dS>0

d)

all of the mentioned

2.

The entropy of an isolated system can never ____

a)

increase

b)

decrease

c)

be zero

d)

none of the mentioned

3.

If the cyclic integral of dQ/T is greater than zero then the cycle is

a)

irreversible but not possible

b)

irreversible but possible

c)

impossible

d)

reversible

4.

Which of the following is known as the inequality of Clausius?

a)

cyclic integral of dQ/T<=0

b)

cyclic integral of dQ/T>=0

c)

cyclic integral of dW/T<=0

d)

cyclic integral of dW/T>=0

5.

If dQ is the heat supplied at T and dQ2 is the heat rejected at T2, then efficiency is given by

a)

1-(dQ2/dQ)

b)

1-(dQ/dQ2)

c)

(dQ/dQ2)-1

d)

(dQ2/dQ)-1

6.

Entropy is a

a)

path function, intensive property

b)

path function, extensive property

c)

point function, intensive property

d)

point function, extensive property

7.

For two different paths between same two points, entropy change is

a)

depends on path taken

b)

different

c)

same

d)

none of the mentioned

8.

For a reversible heat transfer and process being adiabatic, which of the following is true?

a)

dQ=0

b)

dS=0

c)

S=constant

d)

all of the mentioned

9.

The area under the curve ∫TdS is equal to the

a)

work done

b)

heat transferred

c)

internal energy change

d)

none of the mentioned

10.

Which of the following statement is true?

a)

for reversible isothermal heat transfer, Q=t(Sf-Si)

b)

for reversible adiabatic process, S=constant

c)

both of the mentioned

d)

none of the mentioned

11.

A Carnot cycle has following processes.

a)

4 reversible isotherms

b)

4 reversible adiabatics

c)

2 reversible isotherms and 2 reversible adiabatics

d)

none of the mentioned

12.

Entropy can be transferred to or from a system in which of the following forms?

a)

heat transfer

b)

mass flow

c)

both of the mentioned

d)

none of the mentioned

13.

What happens when heat is added to the system?

a)

dQ is positive

b)

dS=dQ/T

c)

entropy of the system increases

d)

all of the mentioned

14.

The process which decreases the entropy of the universe is

a)

reversible process

b)

irreversible process

c)

impossible process

d)

none of the above

15.

Change in entropy is zero during

a)

Constant pressure process

b)

Constant volume process

c)

Constant temperature process

d)

Reversible adiabatic process

16.

Change of entropy is depends on.......

a)

Work transfer

b)

Heat transfer

c)

Mass transfer

d)

Pressure transfer

17.

for isothermal process

a)

$ds=C_p\ln\ \frac{V_2}{V_1}$

b)

$ds=R\ln\ \frac{V_2}{V_1}$

c)

$ds=C_p\ln\ \frac{T_2}{T_1}$

d)

$ds=C_v\ln\ \frac{T_2}{T_1}$

18.

for isobaric process

a)

$ds=C_p\ln\ \frac{V_2}{V_1}$

b)

$ds=R\ln\ \frac{V_2}{V_1}$

c)

$ds=C_p\ln\ \frac{T_2}{T_1}$

d)

$ds=C_v\ln\ \frac{T_2}{T_1}$

19.

specific heat of air and characteristic gas constant are (in Kj/kg.k)

a)

1.005, 0.728, 0.287

b)

1.005, 4.2, 8.314

c)

1.005, 0.728, 8.314

d)

None

20.

Choose incorrect statement

a)

$R=C_v\left(\gamma-1\right)$

b)

$R=C_p-C_v$

c)

$\gamma=\frac{C_p}{C_v}$

d)

slope of constant volume curve is lower as compare to constant pressure curve on T S diagram

21.

A heat engine receives reversibly 420 kJ/cycle of heat from a source at 327°C, and rejects heat reversibly to a sink at 27°C. There are no other heat transfers. if heat rejected is 210 kJ/cycle. choose correct statement

a)

cycle is impossible

b)

cycle is irreversible

c)

cycle is reversible

d)

all are incorrect

22.

A heat engine receives reversibly 420 kJ/cycle of heat from a source at 327°C, and rejects heat reversibly to a sink at 27°C. There are no other heat transfers. if heat rejected is 420 kJ/cycle. choose correct statement

a)

cycle is impossible

b)

cycle is irreversible

c)

cycle is reversible

d)

all are incorrect

23.

Two kg of water at 80°C are mixed adiabatically with 3 kg of water at 30°C in a constant pressure process of 1 atmosphere. Find the final temperature in degree celcius of the total mass of water due to the mixing process

a)

50

b)

90

c)

30

d)

140

24.

Area under the T-S curve shows

a)

work done

b)

change in entropy

c)

heat transfer

d)

internal energy

25.

if 10 grams of water at 0 degree converted in water at 0 degree. calculate the change in entropy in j/k if latent heat of fusion is 335 Kj/Kg

a)

12.27

b)

17.22

c)

335

d)

162

Entropy Section 1

Total questions: 25

Worksheet time: 13mins

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