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ELECTRICAL MACHINES QUIZ

Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

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A large series motor is never started without some mechanical on it because otherwise it will

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A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

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Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

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A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would 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 source voltage of a DC motor is increased, which of the following will decrease?

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The direction of rotation of a 3 - Φ induction motor can be reversed by

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Commonly used starters of cage motor is

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In above question, the output power delivered by generator G1 and G2 will be

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