In a shaded pole single-phase motor, the revolving field is produced by the use of

While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by

A

induction motor torque in field winding

B

induction motor torque in damper winding

C

eddy current and hysteresis torque in pole faces

D

reHetance motor torque due to saliency of the rotor

E

all of the above methods

In case of a shaded pole motor the direction of rotation of the motor is

A

from main pole to shaded pole

B

from shaded pole to main pole

C

either of the above depending on voltage

D

either of the above depending on power factor

A small square region inside a larger square is shaded. The diagonal of the larger square is three times the diagonal of the small square in length. What fraction of the area of the larger square is not shaded?

A

1/9

B

1/3

C

2/3

D

8/9

Radius of circle center 0 is 3 times the radius of circle center C. Angle ACB -A angle POQ. If the shaded are of circle C is 2 then what is the area of then shaded part of circleO?

A

36

B

9

C

12

D

18

A shaded pole motor does not possess

A

centrifugal switch

B

capacitor

C

commutator

D

all of the above

In a shaded pole motor, the shading coil usually consist of

A

a single turn of heavy wire which is in parallel with running winding

B

a single turn of heavy copper wire which is short-circuited and carries only induced current

C

a multilayer fine gauge copper wire in parallel with running winding

D

none of the above

The shaded pole motor is used for

A

high starting torque

B

low starting torque

C

medium starting torque

D

very high starting torque

A shaded pole motor can be used for

A

toys

B

hair dryers

C

circulators

D

any of the above

Locked rotor current of a shaded pole motor is

A

equal to full load current

B

less than full load current

C

slightly more than full load current

D

several times the full load current

The length of a rectangular field F is 3 km greater than the side of a square field M , and the width of field F is 3 km less then the side of field M. If the area of field M is m2 square km, what is the area of field F?

A

m2 +6

B

6

C

m2 - 6

D

m2 +9

In a shaded pole single-phase motor, the revolving field is produced by the use of

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