FPSC Assistant Executive Engineer (Electrical) Test

(All the questions copied from mcq-engineering.blogspot.com)

DC Generator MCQs

1. The basic requirement of a d.c. armature winding is that it must be
(a) a closed one ✓
(b) a lap winding
(c) a wave winding
(d) either (b) or (c)

2. A 4-pole, 12-slot lap-wound d.c. armature has two coil-sides/slot. Assuming single turn coils and progressive winding, the back pitch would be
(a) 5
(b) 7 ✓
(c) 3
(d) none

Alternators MCQs

3. The frequency of voltage generated by an alternator having 4-poles and rotating at 1800 r.p.m. is .......hertz.
(a) 60 ✓
(b) 7200
(c) 120
(d) 450.

4. The main disadvantage of using short-pitch winding in alternators is that it
(a) reduces harmonics in the generated voltage
(b) reduces the total voltage around the armature coils ✓
(c) produces asymmetry in the three phase windings
(d) increases Cu of end connections.