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JHJHJH > thermo > Flashcards

thermo Flashcards

1
Q
  1. 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

A

D

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2
Q
  1. A system comprising a single phase is called a

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

A

D

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3
Q
  1. 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

A

A

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4
Q
  1. 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

A

D

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5
Q
  1. 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

A

A

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6
Q
  1. The characteristic equation of gases pV = mRT holds good for

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

A

C

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7
Q
  1. A gas which obeys kinetic theory perfectly is known as
    A. monoatomic gas
    B. diatomic gas
    C. real gas
    D. Perfect gas.
A

D

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8
Q
  1. Work done in a free expansion process is
    A. Zero
    B. minimum
    C. maximum
    D. positive
A

A

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9
Q
  1. Which of the following is not a property of the system?

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

A

D

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10
Q
  1. 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

A

B

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11
Q
  1. 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

A

A

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12
Q
  1. The processes or systems that do not involve heat are called

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

A

D

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13
Q

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

A

A

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14
Q

41In isothermal process

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

A

D

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15
Q
  1. During throttling process

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

A

D

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16
Q
  1. 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

A

B-

17
Q
  1. 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

A

C

18
Q
  1. 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.

A

B?

19
Q
  1. 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.
A

B-

20
Q
  1. 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)
A

D

21
Q
  1. 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.
A

B

22
Q

49The heat absorbed or rejected during a polytropic process is

A

A?

23
Q
  1. 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

A

B

24
Q
  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

A

D

25
Q
  1. 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.

A

A

26
Q
  1. Characteristic gas constant of a gas is equal to

A. C/Cv
B. Cv/Cp
C. Cp – Cv
D. Cp + Cv

A

C

27
Q
  1. Carnot cycle has maximum efficiency for

A. reversible engine
B. irreversible engine
C. new engine
D. petrol engine

A

A

28
Q
  1. 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

A

B

29
Q
  1. 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

A

B

30
Q
  1. 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

A

A

31
Q
  1. 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

A

A

32
Q
  1. Carnot cycle is

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

A

A

33
Q
  1. All spontaneous processes are
    A. reversible
    B. irreversible
    C. quasi-static
    D. none of the above
A

B

34
Q
  1. 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

A

A

35
Q
  1. 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

A

B

36
Q
  1. In a carnot cycle, the working medium rejects heat at a
    temperature.

A.lower
B. higher
C. constant
D. none of the mentioned

A

A

37
Q

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

A

B

JHJHJH (16 decks)

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