EXAMIANS
The flux involved in the emf equation of a transformer has
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Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?
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A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?
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A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly
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In a transformer
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If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be
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To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be
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If the temperature of armature resistance is increased, the speed of a series motor would
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If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by
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Variation in speed by ward-Leonard control of DC motors occurs due to variation in
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