1) The type of the motor that does not have a commutator is :

repulsion motor

induction motor

d.c. shunt motor

a.c. series motor

Answer is:

induction motor

Explanation:

the line voltage

slip-rings

a centrifugal switch

magnetic induction

Answer is:

three phases

two phases

single phase

all the above

Answer is:

interchanging the supply connections

reversing the connections of the auxiliary winding (starting winding) only

reversing the connections of either the running winding or the starting winding

reversing the connections of the running winding only

Answer is:

1000 R.P.M.

1200 R.P.M.

6000 R.P.M.

7200 R.P.M.

Answer is:

Explanation:

Ns=(120 x Frequency)/Number of Poles

Ns=(120×50)/6=1000 RPM