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

  • question_answer For maximum blade efficiency of a single-stage impulse turbine, the blade speed ratio, (\[\alpha \] is the angle made by absolute velocity at inlet) should be:

    A) \[\cos \,2\alpha \]                       

    B) \[\frac{\cos \,2\alpha }{2}\]

    C) \[\frac{\cos \alpha }{2}\]            

    D) \[\frac{2}{\cos \alpha }\]

    Correct Answer: C

    Solution :

    For maximum blade efficiency of single-stage impulse turbine, blade speed ratio, \[\rho =\frac{\cos \alpha }{2}\]


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