EXAMIANS
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs
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Which of the following is/are the advantages of carbon brush over the copper brush?
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Reversing the direction of rotation of split phase motors is done by
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In a dc machine 4 pole lap winding is used. The number of parallel paths are?
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The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is
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In which of the following generators negative voltage regulation can occur?
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Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be
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Transformer core is laminated to reduce
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Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is
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What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.
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