Which of the following law/rule can he used to determine the direction of rotation of D.C. motor?

In repulsion motor direction of rotation of motor

A

Is opposite to that of brush shift

B

Is the same as that of brush shift

C

Is independent of brush shift

D

None

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

The direction of rotation of a D.C. series motor can be changed by

A

Interchanging supply terminals

B

Interchanging field terminals

C

Either of (A) and (B) above

D

None of the above

Direction of rotation of a split phase motor can be reversed by reversing the connection of

A

running winding only

B

starting winding only

C

either (A) or (B)

D

both (A) and (B)

The direction of rotation of an hysteresis motor is determined by

A

interchanging the supply leads

B

position of shaded pole with respect to main pole

C

retentivity of the rotor material

D

none of these

To reverse the direction of rotation of acapacitor start motor while it is running we should

A

disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding

B

disconnect motor from supply and immediately reconnect it to supply with reversed con-nections of the main winding

C

reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply

D

reverse the direction of connections of the auxiliary winding and immediately connect it to supply

The angle between the direction of star and the direction of earth's axis of rotation is called

A

Co-declination

B

Co-latitude

C

Declination

D

Latitude

Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be

A

Level compounded

B

Under compounded

C

Cumulatively compounded

D

Differentially compounded

By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?

A

Frame

B

Shaft

C

Commutator

D

Stator

A motor pool has 300 vehicles of which 30% are trucks. 20% of all the vehicles in the motor pool are diesel, including 15 trucks. What percent of the motor pool is composed of vehicles that are neither trucks nor diesel?

A

165%

B

90%

C

65%

D

10%

Which of the following law/rule can he used to determine the direction of rotation of D.C. motor?

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