The internal efficiency of a mercury arc rectifier depends on
A). voltage only
B). current only
C). voltage and current
D). r.m.s. value of current
E). none of the above
1. The material for armouring on cable is usually
3. For which of the following applications motor has to start with high acceleration?
7. The outstanding characteristics of a D.C. amplifier is its
8. A cable carrying alternating current has
9. An e-mail message can be sent to many recipients.
10. When the armature of a D.C. motor rotates, e.m.f. induced is