Railways Technical Ability Metal Forming, Casting and Cutting Question Bank Metal Casting

  • question_answer A hydraulic coupling transmits 1 kW of power at an input speed of 200 rpm, with a slip of 2%. If the input speed is changed to 400 rpm, the power transmitted with the same slip is:

    A) 2 kW                

    B) 1/2 kW

    C) 4 kW                

    D) 8 Kw

    Correct Answer: C

    Solution :

    \[P\propto {{N}^{2}},\] \[{{P}_{2}}={{P}_{1}}{{\left( \frac{{{N}_{2}}}{{{N}_{1}}} \right)}^{2}}=1\times {{\left( \frac{400}{200} \right)}^{2}}=4kW\]

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