A dual trace CRO has:
1). One electron gun
2). Two electron guns
3). One electron gun with one two pole switch
4). Two electron guns with one two pole switch
1. Arc in a circuit behaves as
3. Which of the following law/rule can he used to determine the direction of rotation of D.C. motor?
4. Usually wide and sensitive speed control is desired in case of
5. In a synchronous motor, the damping winding is generally used to