AC Machines

1.       What is the basic function of a transformer?
A- It is to change the level of the voltage

2.       Frequency changes from primary to secondary in transformer?
A-  False

3.       What id the approximate efficiency of a Power Transformer?
A- Around 95%

4.       By ………. the electrical power is transferred from primary to secondary in a transformer?
A- Magnetic Flux

5.       How are the two windings of a transformer linked?
A- Inductively Linked

6.       The flux that is created y the current flowing through the primary winding Induces EMF in?
A- both the primary and secondary windings.

7.       The iron core provides a ………. Path to maintain the flux?
A- low reluctance

8.       What will happen if a rated DC voltage is applied at input of a transformer instead of AC?
A- Transformer action will not take place at all.

9.       An Ideal transformer changes power from primary to secondary?
A- False , Power remains same

10.   On which quantities the core flux of a transformer depends mainly?
A- Supply Voltage and frequency.