Electric Machines Mega Quiz 3

(a) direction of induced e.m.f.

(b) direction of flux

(c) direction of motion of the conductor if forefinger points in the direction of generated e.m.f.

(d) direction of motion of conductor, if forefinger points along the lines of flux

(a) ball bearings

(b) bush bearings

(c) magnetic bearmgs

(d) needle bearings

(a) severe sparking

(b) rough commutator surface

(c) imperfect contact

(d) any of the above

(a) double the number of poles

(b) same as the number of poles

(c) half the number of poles

(d) two

(a) Lap winding

(b) Wave winding

(c) Either of (a) and (b) above

(d) Depends on other features of design