Element of Electrical Design (3160918) MCQs

MCQs of GENERAL DESIGN ASPECTS

Showing 31 to 40 out of 84 Questions
31.

How are the pulsation losses aggravated?

(a)

if the air gap is small compared with slot openings

(b)

if the air gap is reduced

(c)

if the air gap is increased

(d)

if the air gap is made larger than the slot openings

Answer:

Option (a)

32.

What is the formula for the magnetizing current?

(a)

magnetizing current = total mmf * number of turns

(b)

magnetizing current = total mmf / number of turns

(c)

magnetizing current = total mmf + number of turns

(d)

magnetizing current = total mmf – number of turns

Answer:

Option (b)

33.

What is the formula for the rms value of the magnetizing current?

(a)

rms value of the magnetizing current = maximum magnetizing current / peak factor

(b)

rms value of the magnetizing current = maximum magnetizing current * peak factor

(c)

rms value of the magnetizing current = maximum magnetizing current + peak factor

(d)

rms value of the magnetizing current = maximum magnetizing current – peak factor

Answer:

Option (a)

34.

The value of magnetizing current depends up on

(a)

The total mmf required

(b)

No. of turns in exciting winding

(c)

Distribution of winding

(d)

All of these

Answer:

Option (d)

35.

What is the relation of the type of winding with the flux linkage?

(a)

in distributed windings, the flux does not link with all the turns

(b)

in distributed windings the flux links with all the turns

(c)

in concentrated windings the flux links with all the turns

(d)

in concentrated windings, the flux does not link with all the turns

Answer:

Option (a)

36.

What is the relation of the magnetizing current with the turns per phase?

(a)

magnetizing current is directly proportional to the turns per phase

(b)

magnetizing current is directly proportional to the square of the turns per phase

(c)

magnetizing current is indirectly proportional to the turns per phase

(d)

magnetizing current is indirectly proportional to square of the turns per phase

Answer:

Option (c)

37.

Which of the following equation is used to find magnetizing current in transformers and in salient pole machines?

(a)

Im=0.707 ATT

(b)

Im=0.37 ATph Pkw Tph

(c)

Im=0.427 AT60 Pkw Tph

(d)

All of these

Answer:

Option (a)

38.

Which of the following equation is used to find magnetizing current in distributed winding with sinusoidal flux distribution?

(a)

Im=0.707 ATT

(b)

Im=0.37 ATph Pkw Tph

(c)

Im=0.427 AT60 Pkw Tph

(d)

All of these 

Answer:

Option (b)

39.

Which of the following equation is used to find magnetizing current in distributed winding with non-sinusoidal flux distribution?

(a)

Im=0.707 ATT

(b)

Im=0.37 ATph Pkw Tph

(c)

Im=0.427 AT60 Pkw Tph

(d)

All of these 

Answer:

Option (c)

40.

Magnetizing current in distributed winding is depended up on _________________

(a)

the flux distribution

(b)

the flux density

(c)

the flux 

(d)

None of these 

Answer:

Option (a)

Showing 31 to 40 out of 84 Questions