ACTIVE AND PASSIVE COMPONENTS - Quiz

1) What is the main problem caused for severe pitting in relays?

Low contact current Excessive contact current Chatter during a slow release Excessive number of operations

2) What is the effect on the transformer operated below the rated voltage?

Burn out windings Leads to interwinding leakage Transformer heated up excessively Delivers reduced secondary voltage

3) What is the purpose of vacuum contactors in electrical panel?

Fast switching Slow switching Packet switching Medium switching

4) What is the reason for the use of contactors in control circuits?

Supply power to loads To increase load current To decrease load current To protect the load from arcing

5) Why the transformer core is made as thin laminations?

To minimize eddy current losses To increase the hysteresis losses To maximize eddy current losses To increase core saturation losses