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Railways NTPC (Technical Ability) Thermodynamics Question Bank Thermodynamics

  • question_answer
    A refrigerating machine working on reversed Carnot cycle takes out 2 kW of heal from the system at 200 K while working between temperature limits of 300 K and 200 K. COP and power consumed by the cycle will respectively, be:                           

    A) 1 and 1 kW                   

    B) 1 and 2 kW         

    C) 2 and 1 kW                   

    D) 2 and 2 kW    

    Correct Answer: C

    Solution :

    \[{{T}_{1}}=300\,K,\] \[{{T}_{2}}=200\,K,\] \[COP=\frac{{{T}_{2}}}{{{T}_{1}}-{{T}_{2}}}=\frac{200}{300-200}=\frac{200}{100}=2\] Power consumed \[=\frac{Q}{COP}=\frac{2}{2}=1\,kW\]


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