reversing the supply connections

interchanging the armature and field connections

adding a resistance in the field circuit

reversing the armature connections or the field connections

zero

3000 r.p.m.

3600 r.p.m.

infinity

motor will run at a very high speed

motor will run at a very low speed

motor will burn

motor will not run at all

armature current is reduced

flux is reduced

line current is reduced

none of these

it will continue to run at the rated speed

its speed will become very high

the motor will stop

its speed will reduce