ECAT Pakistan · Physics

Thermodynamics and Heat Engines

9 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 9 questions

  1. One mole of an ideal monoatomic gas (gamma = 5/3) expands adiabatically from volume V to 8 V. If initial temperature is 300 K, what is the final temperature?
  2. In an isobaric process at pressure P = 1.0 x 10^5 Pa, an ideal gas expands from 0.02 m^3 to 0.05 m^3. How much work is done by the gas?
  3. What is the molar heat capacity at constant volume (C_v) for an ideal monoatomic gas?
  4. For any reversible cyclic process, what is the value of the cyclic integral of (dQ / T) according to Clausius' theorem?
  5. In a refrigerator operating on a reversed Carnot cycle between -13 °C (260 K) and 27 °C (300 K), what is the theoretical coefficient of performance (COP)?
  6. What happens to the temperature of an ideal gas during a free adiabatic Joule expansion into an evacuated chamber?
  7. Which thermodynamic process corresponds to a path on a PV diagram where no heat enters or leaves the system (Q = 0)?
  8. What is the change in entropy when 1.0 kg of ice melts reversibly into water at 0 °C (273 K)? (Latent heat of fusion of ice L_f = 3.34 x 10^5 J/kg)
  9. What is the ratio of C_p to C_v (gamma) for an ideal diatomic gas with unexcited vibrational modes at room temperature?

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