Thermodynamics

141. Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure

  1. enthalpy
  2. volume
  3. mass
  4. entropy
  5. specific volume.

Correct answer: (B)
volume

142. Which of the following processes are thermodynamically reversible

  1. throttling
  2. free expansion
  3. constant volume and constant pressure
  4. hyperbolic and pV = C
  5. isothermal and adiabatic.

Correct answer: (E)
isothermal and adiabatic.

143. Which of the following processes is irreversible process

  1. isothermal
  2. adiabatic
  3. throttling
  4. all of the above
  5. none of the above.

Correct answer: (C)
throttling

144. Which of the following quantities is not the property of the system

  1. pressure
  2. temperature
  3. specific volume
  4. heat
  5. density.

Correct answer: (D)
heat

145. Which of the following represents the perpetual motion of the first kind

  1. engine with 100% thermal efficiency
  2. a fully reversible engine
  3. transfer of heat energy from low temperature source to high temperature source
  4. a machine that continuously creates its own energy
  5. production of energy by temperature differential in sea water at different levels.

Correct answer: (A)
engine with 100% thermal efficiency

146. Which of the following variables controls the physical properties of a perfect gas

  1. pressure
  2. temperature
  3. volume
  4. all of the above
  5. atomic mass.

Correct answer: (D)
all of the above

147. Work done in a free expansion process is

  1. =+ ve
  2. =K149
  3. zero
  4. maximum
  5. minimum.

Correct answer: (C)
zero

148. Work done in an adiabatic process between a given pair of end states depends on

  1. the end states only
  2. particular adiabatic process
  3. the value of index n
  4. the value of heattransferred
  5. mass of the system.

Correct answer: (A)
the end states only

149. Work done is zero for the following process

  1. constant volume
  2. free expansion
  3. throttling
  4. all of the above
  5. none of the above.

Correct answer: (D)
all of the above

150. Zeroth law of thermodynamics

  1. deals with conversion of mass and energy
  2. deals with reversibility and irreversibility of process
  3. states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
  4. deals with heat engines
  5. does not exist.

Correct answer: (C)
states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other

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