DC Motors MCQs

Question 1

The or pitch of lap

Accepted Answer

?I

Answer

1

Answer

+1 or ?1 Ni

Question 2

A de generator of commutate winding is has 6 poles. A physical shift brush shift of 6?means an eke trical brush

Accepted Answer

300

Answer

6?

Answer

18?

Answer

none of these

Question 3

For wave 2?

Accepted Answer

must be even

Answer

mu winding, the average pitch

Answer

may be odd or even

Answer

must be fractional

Question 4

The number of armature parallel paths in a triplex pole de generator provided with lap winding win be

Accepted Answer

120 PN

Answer

10 PN

Answer

30 PN

Answer

180 PN

Question 5

Which of the following IS Closet to the generator, armature circuit resistance of a dc

Accepted Answer

2 W

Answer

20 W

Answer

2000 W

Answer

200 W

Question 6

Hysteresis losses in a dc generator are basically due to

Accepted Answer

reversal of man coreetism of the armature core

Answer

current flowing in the armature

Answer

initial energy to magnetise the core

Answer

none of these

Question 7

Hysteresis los proportional to ses in a de machine are

Accepted Answer

N

Answer

IN

Answer

N2

Answer

1/N2

Question 8

Eddy current losses in as n a de machi

Accepted Answer

t2

Answer

1/t e vary

Answer

142

Answer

t

Question 9

A re t is the thickness of laminations de machine has of efficiency when

Accepted Answer

variable losses constant losses

Answer

variable losses --- corrTZT-

Answer

variable losses (constant losses)

Answer

none losses of these