Alternators MCQs
Practice free Alternators multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 172 questions — no login required.
Question 37easy
In a slip test on a salient-pole machine, the emf induced in the field winding is
Question 38easy
If in a 3-4) alternator, a field current of 50 A produces a full-load armature current of 200 A on short-circuit and 1730 V on open circuit, then its synchronous impedance is
Question 39easy
For a P-pole machine, the relation between electrical and mechanical degrees is given by
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Question 40easy
El, E3, E5 are the fundamental, third harmonic and fifth harmonic per phase voltage generated in a starconnected alternator. Its line voltage is
Question 41easy
An alternator has rated field current of 2A. This alternator is developing 200 V at a field current of 1 A at rated speed. If its field current is made 2A at rated speed, then the generated voltage would be
Question 42easy
An alternator running at 1500 r.p.m. delivers rated current of 30A to a purely inductive load. With the filed current remaining constant, If the speed is reduced to 1000 rpm, the load current becomes
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Question 43easy
For eliminating 7th harmonics from the e.m.f. wave of an alternator, the fractional-pitch must be