Electrical Scientific Principles Practice Exam Questions

Give ONE reason why alternating current is used for transmission and distribution (instead of direct current).

Give TWO reasons why electricity is transmitted at high voltages from a power station.

State TWO transmission voltages.

State ONE distribution voltage suitable for light industry or for a large hospital.

Refer to the diagram of the PV system below. Identify items 1, 2, and 3 and briefly explain their purpose.

With regards to a three phase four wire supply what is meant by each of the following: I. PEN Conductor II. PME.

The line voltage of a three phase four wire supply is 415 V a.c. Calculate the value of the phase voltage.

Sketch a circuit diagram for an auto-transformer.

What is the constructional difference of an auto-transformer when compared to double wound transformer?

Name three losses which occur in transformers.