51) If the front pitch will be less than back pitch the type of winding is called as :

progressive lap (or) wave winding

retrogressive lap (or) wave winding

duplex lap (or) wave winding

simplex lap (or) wave winding

Answer is:

progressive lap (or) wave winding

It assists to hold the bobbin firmly

To determine the exact number of turns in a coil

To check the wire under proper tension

It stops and reverses the feed at the desired point

Answer is:

coil separator

slot liner

packing strip

cuffing

Answer is:

Baking varnishes

Thermosetting varnishes

Solvent varnishes

Air - drying varnishes

Answer is:

cotton

silicone elastomer

Leatheroid paper

glass fibre

Answer is: