Assessment 3- Unit 16 Verify compliance of low voltage systems

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Assessment 3- Unit 16 Verify compliance of low voltage systems

Q1 of 10 Score: 1

The value of a satisfactory insulation resistance test on each final circuit of a 230 V installation must be

less than 0.5 ohm

less than 1 ohm

not less than 1Mohm

not less than 0.5 Mohm

Q2 of 10 Score: 1

All these are true for overload circuit current except

Low resistance fault causing a fault current to flow

Caused by faulty appliances

Occurs in a sound circuit

Current greater than nominal flows

Q3 of 10 Score: 1

1. Automatic disconnection of supply is used as a method of protection for

Indirect contact

Basic protection

Fault protection

d. Direct contact

Q4 of 10 Score: 1

1. What type of fault is a RCD designed to protect against

large overload faults

short circuits between live and neutral

earth-leakage faults

a nail hammered into a wall, shorting-out live and neutral

Q5 of 10 Score: 1

1. Which test applies 500V between live and earth conductors

Polarity test

Insulation resistance test

Continuity test

RCD functional test

Q6 of 10 Score: 1

The purpose of the polarity tests is to:

The earth loop impedance

The effective operation of RCDs

The effective of controls and switch-gear

The protective devices are connected in the line conductor

Q7 of 10 Score: 1

An area in which an explosive gas-air mixture is present is called

confined

restricted

hazardous

dangerous

Q8 of 10 Score: 1

The objective of earthing or grounding is

to provide as low resistance possible to the ground

to provide as high resistance possible to the ground

to provide flow of positive, negative and zero sequence currents

to provide over-current protection

Q9 of 10 Score: 1

1. A final circuit feeding socket outlets with a rated current of less than 20A and used by ordinary persons for general use must always have

Overcurrent protection only

30mA RCD protection and over-current protection

Splash proof protection

Incorporate an industrial type socket outlet

Q10 of 10 Score: 1

1. Which one of the following is not an example of an 'short-circuit fault'?

severing live conductors with cable cutters

large machines (motors) starting up

insulation failure in a circuit

incorrect conductor terminations (L to E for example)

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