Electrical Online Practice Set 4

    Relay protection is generally not provided for -

    Correct! Wrong!

    A two-winding transformer operates at maximum efficiency when its -

    Correct! Wrong!

    For measuring high values of A.C. with a dynamometer ammeter, we use a __ Shunt .

    Correct! Wrong!

    The S.I. unit of µ˳ is -

    Correct! Wrong!

    The current drawn by a 220 V DC motor of armature resistance 0.5 ohm and back emf 200 V is -

    Correct! Wrong!

    The commutating pole winding is connected in -

    Correct! Wrong!

    The greatest percentage of power loss in DC motor is due to -

    Correct! Wrong!

    In DC shunt generator, the constant loss -

    Correct! Wrong!

    Hystersis loss in DC machine is directly propotional to -

    Correct! Wrong!

    Which of the following generator provided approximately constant voltage from no load to full load -

    Correct! Wrong!

    The operation of a thermocouple is based on

    Correct! Wrong!

    The material, from the below having negative temperature coefficient of resistance is

    Correct! Wrong!

    ______ is used as a coolant in electrical machines to increase their efficiency.

    Correct! Wrong!

    One commercial unit of energy equal to

    Correct! Wrong!

    The nominal voltage for lead-acid cells is

    Correct! Wrong!

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