Railways Technical Ability Automobile Engineering Question Bank Automobile Engineering

  • question_answer After expansion from a gas turbine, the hot exhaust gases are used to heat the compressed air from a compressor with the help of a cross flow compact heat exchanger of 0.8 effectiveness. What is the number of transfer units of the heat exchanger?

    A) 2                                 

    B) 4

    C) 8                                 

    D) 16

    Correct Answer: B

    Solution :

    Effectiveness, \[\varepsilon =\frac{NTU}{1+NTU}\] 0.8 \[=\frac{NTU}{1+NTU}\] NTU = 4

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