thermo

Question 1

22. According to kinetic theory of heat

A. Temperature should rise during boiling
B. temperature should fall during freezing
C. At low temperature all bodies are in solid state
D. At absolute zero there is absolutely no vibration of molecules

Answer 1

D

Question 2

23. A system comprising a single phase is called a

A. Closed system
B. heterogeneous system
C. isolated system
D. homogeneous system

Answer 2

D

Question 3

30. Steady flow occurs when

A. Conditions do not change with time at any point
B. Conditions are the same at adjacent points at any instant
C. Conditions change steadily with the time
D. avlat is constant

Answer 3

A

Question 4

31. A reversible process requires that

A. There be no heat transfer
B. Newton’s law of viscosity be satisfied
C. Temperature of system and surroundings be equal
D. There be no viscous or friction in the system

Answer 4

D

Question 5

32. The first law of thermodynamics for steady flow

A. Accounts for all energy entering and leaving a control volume
B. is an energy balance for a specified mass of fluid
C. is an expression of the conservation of linear momentum.
D. is primarily concerned with heat transfer

Answer 5

A

Question 6

33. The characteristic equation of gases pV = mRT holds good for

A. monoatomic gases
B. diatomic gas
C. Real gases
D. ideal gases

Answer 6

C

Question 7

34. A gas which obeys kinetic theory perfectly is known as
    A. monoatomic gas
    B. diatomic gas
    C. real gas
    D. Perfect gas.

Answer 7

D

Question 8

35. Work done in a free expansion process is
    A. Zero
    B. minimum
    C. maximum
    D. positive

Answer 8

A

Question 9

36. Which of the following is not a property of the system?

A. Temperature
B. Pressure
C. Specific volume
D. Heat

Answer 9

D

Question 10

37. In the polytropic process equation PV” = constant, if n = 0, the process is
    termed as

A. Constant volume
B. Constant pressure
C. Constant temperature
D. Adiabatic

Answer 10

B

Question 11

38. In the polytropic process equation PV” = constant, if n is infinitely large, the
    process is termed as

A. Constant volume
B. constant pressure
C. constant temperature
D. Adiabatic

Answer 11

A

Question 12

39. The processes or systems that do not involve heat are called

A. Isothermal processes
B. equilibrium processes
C. thermal processes
D. adiabatic processes.

Answer 12

D

Question 13

40In a reversible adiabatic process the ratio (T1/T2) is equal to

Answer 13

A

Question 14

41In isothermal process

A. Temperature increases gradually
B. volume remains constant
C. Pressure remains constant
D. Change in internal energy is zero.

Answer 14

D

Question 15

42. During throttling process

A.Internal energy does not change
B. pressure does not change
C. Entropy does not change
D. enthalpy does not change

Answer 15

D

Question 16

43. When a gas is to be stored, the type of compression that would be ideal is

A.Isothermal
B. adiabatic
C. Polytropic
D. Constant volume

Answer 16

B-

Question 17

44. lf a process can be stopped at any stage and reversed so that the system
    and surroundings are exactly restored to their initial states, it is known as

A. Adiabatic process
B. isothermal process
C. ideal process
D. Frictionless process

Answer 17

C

Question 18

45. The state of a substance whose evaporation from its liquid state is
    complete, is known as

A. Vapour
B. perfect gas
C. air
D. steam.

Answer 18

B?

Question 19

46. In SI units, the value of the universal gas constant is
    A. 0.8314 J/mole/K
    B. 8.314 J/mole/K
    C. 83.14 J/mole/K
    D. 8314 J/mole/K.

Answer 19

B-

Question 20

47. When the gas is heated at constant pressure, the heat supplied
    A. increases the internal energy of the gas
    B. increases the temperature of the gas
    C. Does some external work during expansion.
    D. both (b) and (c)

Answer 20

D

Question 21

48. The gas constant (R) is equal to the
    A. Sum of two specific heats
    B. difference of two specific heats
    C. Product of two specific heats
    D. ratio of two specific heats.

Answer 21

B

Question 22

49The heat absorbed or rejected during a polytropic process is

Answer 22

A?

Question 23

50. According to the first law of thermodynamics

A. Mass and energy are mutually convertible
B. heat and work is mutually convertible
C. Mass and light are mutually convertible
D. heat flows from hot to cold substance

Answer 23

B

Question 24

1. Carnot cycle efficiency depends upon

A. properties of the medium/substance used
B. condition of engine
C. working condition
D. temperature range of operation

Answer 24

D

Question 25

4. Carnot cycle is A. a reversible cycle (ft) an irreversible cycle B. a semi-reversible cycle C. a quasi-static cycle D. an adiabatic irreversible cycle.

Answer 25

A

Question 26

6. Characteristic gas constant of a gas is equal to A. C/Cv B. Cv/Cp C. Cp – Cv D. Cp + Cv

Answer 26

C

Question 27

7. Carnot cycle has maximum efficiency for A. reversible engine B. irreversible engine C. new engine D. petrol engine

Answer 27

A

Question 28

9. Efficiency of heat engine cycle is the ratio of A. total heat input to the cycle (Qin) to network output of the cycle (Wnet) B. network output of the cycle (Wnet) to total heat input to the cycle (Qin) C. network output of the cycle (Wnet) to heat rejected from the system (Qout) D. none of the above

Answer 28

B

Question 29

12. Assume that a reversible heat engine is operating between a source at T1 and a sink at T2. If T2 decreases, the efficiency of the heat engine A. decreases B. increases C. remains constant D. none of the above

Answer 29

B

Question 30

13. The efficiency of the Carnot cycle is the function of A. temperatures (T1, T2) between which the Carnot cycle operates B. net work done (Wnet) C. heat supplied (Q1) and heat rejected (Q2) D. all of the above

Answer 30

A

Question 31

15. According to the Carnot's theorem, the efficiency of a reversible heat engine operating between a same given constant temperature source and a given constant temperature sink is A. higher than any other irreversible heat engine B. less than any other irreversible heat engine C. equal to any other irreversible heat engine D. none of the above

Answer 31

A

Question 32

16. Carnot cycle is A. a reversible cycle B. an irreversible cycle C. practical cycle D. none of the above

Answer 32

A

Question 33

17. All spontaneous processes are A. reversible B. irreversible C. quasi-static D. none of the above

Answer 33

B

Question 34

25. The thermal energy reservoir from which heat is transferred to the system which works on heat engine cycle is called as A. source B. sink C. atmosphere D. all of the above

Answer 34

A

Question 35

26. The thermodynamic cycle in which net heat is transferred to the system and a network is transferred from the system is called as A. refrigeration cycle B. heat engine cycle C. both a. and b. D. none of the above

Answer 35

B

Question 36

33. In a carnot cycle, the working medium rejects heat at a temperature. A.lower B. higher C. constant D. none of the mentioned

Answer 36

A

Question 37

34in a carnot cycle, the working fluid is a real gas an ideal gas a natural gas none of the mentioned

Answer 37

B