76) One of the main reasons for NOT building up the voltage in D.C. generator is :

the generator runs at rated speed

the field circuit resistance is more than field critical resistance

the residual magnetism existing in the field cores

brushes are in proper contacts

Answer is:

the field circuit resistance is more than field critical resistance

providing compensating winding in the main pole faces

shifting brush position from GNA to MNA

providing inter poles between the main poles

using low resistance brushes

Answer is:

Regulator

Semi conductor rectifier

Commutator

Transformer

Answer is:

brass

hard drawn copper

bronze

steel

Answer is:

convert AC into uni-directional current

collect the current from the commutator

increase the magnetic flux

connect the armature and commutator

Answer is: