57.7%
66.3%
33.3%
50%

## Electrical Machines If the air gap of IM is increased, ____________ will increase.

power factor.
speed.
magnetizing current.
air gap flux.

33.33 Amp.
44.47 Amp.
43 Amp.
29 Amp.

## Electrical Machines In DC generator, lap winding is used in

high current and low voltage applications.
where constant speed is required.
high voltage and low current applications.

K²R1
R1 /K
K×R1
R1 /K²

## Electrical Machines Consider the following statements about commutating poles which are fitted on most large dc Shunt motors: 1. The commutating poles are placed in the geometric neutral plane and their number is usually Equal to the number of main poles 2. The winding on the commutating poles is connected in series with the shunt-field winding on the main poles 3. The polarity of the commutating pole must be that of the next pole further ahead 4. The commutating poles neutralize the reactance voltage produced in the coil undergoing Commutation. Of these statements,

1 and 4 are correct
1, 2 and 4 are correct
2, 3 and 4 are correct
1, 2 and 3 are correct