Deck 11: Concepts of Heat Transfer, Irreversibility, and Thermodynamic Properties

Question 1

All actual heat transfer processes are

A)irreversible
B)take place through a finite temperature difference
C)both of the mentioned
D)none of the mentioned

Answer 1

both of the mentioned

Question 2

Free expansion is irreversible.

Answer 2

True

Question 3

Which of the following can be a cause of irreversibility?

A)friction, viscosity
B)inelasticity
C)electrical resistance, magnetic hysteresis
D)all of the mentioned

Answer 3

all of the mentioned

Question 4

The continual motion of a movable device in the complete absence of friction is known as

A)pmm2
B)pmm³
C)pmm1
D)pmm0

Question 5

The friction present in moving devices makes a process reversible.

Question 6

Which of the following is irreversible?

A)stirring work
B)friction work in moving devices
C)current flowing through a wire
D)all of the mentioned

Question 7

A process will be reversible if it has

A)no dissipative effects
B)dissipative effects
C)depends on the given conditions
D)none of the mentioned

Question 8

Irreversibility can be distinguished in how many types?

A)0
B)1
C)2
D)3

Question 9

Internal irreversibility is caused by

A)internal dissipative effects
B)friction, turbulence
C)electrical resistance, magnetic hysteresis
D)all of the mentioned

Question 10

The external irreversibility occurs at the system boundary.

Question 11

Which of the following is true?

A)mechanical irreversibility is due to finite pressure gradient
B)thermal irreversibility is due to finite temperature gradient
C)chemical irreversibility is due to finite concentration gradient
D)all of the mentioned

Question 12

The magnitude of mechanical work is the

A)product of the force and distance travelled perpendicular to the force
B)product of the force and distance travelled parallel to the force
C)sum of the force and distance travelled perpendicular to the force
D)sum of the force and distance travelled parallel to the force

Question 13

Work done by a system is taken to be

A)positive
B)negative
C)zero
D)varies according to situation

Question 14

Work done on a system is taken to be

A)positive
B)negative
C)zero
D)varies according to situation

Question 15

Work is a

A)point function
B)path function
C)depends on the state
D)none of the mentioned

Question 16

Thermodynamic properties are

A)point function
B)path function
C)depends on the state
D)none of the mentioned

Question 17

In the equation dV=(1/p)dW, (1/p) is known as

A)volume factor
B)pressure factor
C)differential factor
D)integration factor

Question 18

Cyclic integral of a property is always

A)zero
B)one
C)infinite value
D)none of the mentioned

Question 19

Constant pressure process is also known as

A)isopiestic process
B)isobaric process
C)all of the mentioned
D)none of the mentioned

Question 20

Work done in a quasi-static process

A)depends on the path followed
B)independent of the path followed
C)depends only on the initial and final states
D)none of the mentioned

Question 21

A saturation state is a state from which a change of phase may occur

A)without a change of pressure or temperature
B)with a change of pressure or temperature
C)both of the mentioned
D)none of the mentioned

Question 22

In which of the following state does water exist?

A)saturated solid state
B)saturated liquid state
C)saturated vapour state
D)all of the mentioned

Question 23

The triple point is a line on the p-V diagram, where all the three phases, solid, liquid and gas exist.

Question 24

At a pressure below the triple point line,

A)the substance cannot exist in the liquid phase
B)the substance when heated transforms from solid to vapour
C)both of the mentioned
D)none of the mentioned