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GATE 2023 Electrical Machines Quiz 36

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Question 1

In a synchronous generator operating at zero pf lag, the effect of armature reaction is

Question 2Multiple Correct Options

A turbo generator, connected to an infinite bus is operating at 0.8 power factor lag. If its excitation is increased, with steam input kept constant then it would-

Question 3

What is the load angle in the alternator?

Question 4

If effect of armature reaction is purely magnetizing, then type of load on synchronous generator may be

Question 5

An alternator of 300 kW is driven by a prime moverhaving speed regulation 4% and another alternator of 500 kW is drivenby a prime mover having speed regulation 6%. Governor setting of the prime mover is such that their no- load speed will remain same. The total load can be taken by the two alternators in parallelwithout overloading any one of the two is_____ kW.

Question 6

A 3-phase, 10 kW, 400V, star connected alternator is supplying full load current to infinite bus at rated voltage. It has reactance of 8 Ω with negligible armature resistance. The alternator is normally excited. Then voltage regulation of alternator will be:
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Jun 6ESE & GATE EE