Electrician Practice Tests

A good grounding system can also protect the system from lighting effects.

The resistance between a driven pipe or ground rod, and the earth should not exceed …………… ohms.

If a house having less than two branch circuits with an ampere rating of 25 ampere. what is the minimum wire size that can be used?

As per NEC, minimum …………………… size wire is required for overhead spas up to 50 ft.

If the service entrance current transformer has a turns ratio of 200:5. If the primary of  transformer has a current of a 100 amp what is its secondary current in amperes?

The standby power plant should be capable of delivering the full power within …………… sec of the general power failure.

The emergency power plant one started by a loss of power must continue to run at least 60 minutes after the power is re-established in hospital.

The power factor of a under excited synchronous motor is always……………..

Which of the following motor is most suitable for timing and signalling devices?

Regulating transformers in power system are used in power system to control ……………………….