Three-Phase and Single-Phase Electrical Systems

Three-Phase and Single-Phase Electrical Systems

Assessment

Flashcard

Physics

Vocational training

Practice Problem

Hard

Created by

M D

FREE Resource

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15 questions

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1.

FLASHCARD QUESTION

Front

What is required for single-phase loads?

Back

Single-phase loads require a neutral connection.

2.

FLASHCARD QUESTION

Front

What does the neutral conductor do in single-phase loads?

Back

The neutral carries any out-of-balance current.

3.

FLASHCARD QUESTION

Front

Why should out-of-balance current be minimized?

Back

To reduce cable and switchgear sizes.

4.

FLASHCARD QUESTION

Front

How can values of neutral current be determined?

Back

Using a scale drawing based on an equilateral triangle.

5.

FLASHCARD QUESTION

Front

What happens if all phases are balanced in a three-phase system?

Back

All three sides of the triangle will meet, indicating no neutral current.

6.

FLASHCARD QUESTION

Front

What is a three-phase system?

Back

A system consisting of three separate line conductors and a common neutral conductor.

7.

FLASHCARD QUESTION

Front

How is a symmetrical three-phase supply achieved?

Back

By rotating three coils spaced 120° apart in a uniform magnetic field.

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