Mechanical Engineering - Thermodynamics - Laws of Thermodynamics

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Question - 1

Which of the following are intensive properties?
1. Kinetic energy
2. Specific enthalpy
3. Pressure
4. Entropy
Select the correct answer using the codes given below.

  • A 1 and 3
  • B 2 and 3
  • C 1, 3 and 4
  • D 2 and 4

Question - 2

Consider the following properties:
1. Entropy
2. Viscosity
3. Temperature
4. Specific heat at constant volume
Which of the above properties of a system is/are extensive?

  • A Only 1
  • B 1 and 2
  • C 2,3 and 4
  • D 1, 2 and 4

Question - 3

A reversible heat engine rejects 50 % of the heat supplied during a cycle of operation. If this, engine is reversed and operates as a heat pump, then what is its coefficient of performance?

  • A 1.0
  • B 1.5
  • C 2.0
  • D 2.5

Question - 4

A balloon which is initially collapsed and flat is slowly filled with a gas at 100 kPa, so as to form it into a sphere of 1 m radius. The work done by the gas in the balloon during the filling process is

  • A 428.9 kJ
  • B 418.9 kJ
  • C 420.9 kJ
  • D 416.9 kJ

Question - 5

Which one of the following statements applicable to a perfect gas will also be true for an irreversible process? (Symbol have the usual meanings)

  • A dQ = dU + pdV
  • B dQ = TdS
  • C TdS = dU + pdV
  • D None of these

Question - 6

Which one of the following temperature entropy diagrams of steam shows the reversible and irreversible processes correctly?

  • A
  • B
  • C
  • D

Question - 7

Consider the following statements: When a perfect gas enclosed in a cylinder piston device executes a reversible adiabatic expansion process
1. its entropy will increase.
2. its entropy change will be zero.
3. the entropy change of the surroundings will be zero.
Which of these statements is/are correct?

  • A 1 and 3
  • B Only 2
  • C 2 and 3
  • D Only 1

Question - 8

When a system undergoes a process such that \(\int \frac{dQ}{T}=0\) and \(\Delta S\)= 0,the process is

  • A irreversible adiabatic
  • B reversible adiabatic
  • C isothermal
  • D isobaric

Question - 9

The throttling process undergone by a gas across an orifice is shown by its states in the following figure.

It can be represented on the diagram as

  • A
  • B
  • C
  • D

Question - 10

Consider the following statements:
1. Availability is generally conserved.
2. Availability can either be negative or positive.
3. Availability is the maximum theoretical work obtainable.
4. Availability can be destroyed in irreversibilities.
Which of these statements are correct?

  • A 3 and 4
  • B 1 and 2
  • C 1 and 3
  • D 2 and 4
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