In a vapour compression refrigeration system, throttle valve is used in place of an expander because
  • a)
    it considerably reduces the system weight
  • b)
    it improves the COP, as the condenser is small
  • c)
    the positive work in isentropic expansion of liquid is very small
  • d)
    it leads to significant cost reduction
Correct answer is option 'C'. Can you explain this answer?

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