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GATE 2019: Thermodynamics Quiz 1

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Question 1

When air expands from initial pressure P1 and volume V1 to final volume 5V1 following the law PVn=C

Question 2

Polytropic index n is given by

Question 3

During a constant pressure expansion of a gas, 33.3% heat is converted into work while the temperature rises by 20 K. The specific heat of the gas at constant pressure as a proportion of work, W is

Question 4

Which of the following statements are correct for a throttling process?
1) It is an adiabatic steady flow process
2) The enthalpy before and after throttling is same
3) In the processes, due to fall in pressure, the fluid velocity at outlet is always more than inlet velocity

Question 5

Consider the following conditions for the reversibility of a cycle:
1) The P and T of the working substance must not differ appreciably, from those of the surroundings at any state in the process.
2) All the processes, taking place in the cycle, must be extremely slow.
3) The working parts of the engine must be friction-free.
Which of the following conditions are correct?

Question 6

The effects of heat transfer from a high temperature body to a low temperature body are:
1) The energy is conserved
2) The entropy is not conserved
3) The availability is not conserved
Which of the above statements are correct?
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