82) When conductors are stationary, to induce an e.m.f. dynamically, It is necessary to :

increase the flux around the conductor

decrease the flux around the conductor

rotate the magnetic field over the conductor

set the pole and armature to touch each other

Answer is:

rotate the magnetic field over the conductor

The armature core is not properly laminated

The generator is kept idle for a long time

The armature resistance is more than 1 ohm

Incorrect brush position

Answer is:

inserting compensating winding

providing inter poles between the main pole

shifting the brush position from GNA to MNA

increasing the ampere - turns in the field winding

Answer is:

ebonite

mica

empire

glass

Answer is:

high carbon steel

cast steel

mild steel

wrought iron

Answer is: