EXAMIANS
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?
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The type of DC motor used for shears and punches is
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The ventilating ducts in most of DC machine are
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Which of the following factors improve commutation in a dc machine ? 1. High contact resistance of brushes 2. High inductance of the coils undergoing commutation 3. Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor 4. Narrow width for the commutation bars Select the correct answer using the codes given below : Codes :
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The oscillation in a synchronous motor can be damped out by
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A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?
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The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?
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The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is
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A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?
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There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase
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