A current of constant magnitude and unique direction is called …………… while a current changing its magnitude and direction periodically is called ……………

1. a.c., d.c.
2. d.c., a.c.
3. a.c., a.c.
4. d.c., d.c.

The direction of induced current is obtained by:

1. Fleming's left hand rule
2. Clock rule
3. Right hand thumb rule
4. Fleming's right hand rule

A step up transformer …………… the current whereas a step down transformer …………… the current.

1. increases, increases
2. decreases, decreases
3. decreases, increases
4. increases, decreases

Out of the following, which statement is incorrect ?

1. The lamination of core prevents loss of energy due to eddy currents.
2. The core is made of soft iron.
3. A transformer can be used with d.c.
4. A closed core is used so as to provide a closed path for magnetic field lines.