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T&I MCQs Unit 06— Learning Outcomes 1–3

Total questions: 46

Worksheet time: 23mins

Name
Class
Date
1.

All electrical test probes and leads used in safe isolation must comply with standards set by:

a)

BS EN 60898

b)

BS 7671

c)

HSE GS 38

d)

IET Regulations Part 2

2.

When carrying out safe isolation, which should be used?

a)

Neon screwdriver

b)

Multimeter

c)

Volt stick

d)

Approved voltage indicator

3.

EAWR requires that:

a)

Only persons with suitable knowledge/experience may work

b)

Only duty holders may work

c)

Only time-served electricians

d)

Only supervised apprentices

4.

Electrical safety is best achieved by:

a)

Isolating and securing the supply

b)

Switching supply off

c)

Working during quiet hours

d)

Wearing gloves

5.

Unless justified, electricians should always work on:

a)

Dead circuits

b)

Live circuits

c)

RCD circuits

d)

SELV circuits

6.

Law prohibiting live working except in exceptional circumstances:

a)

PUWER

b)

PPE Regs 1992

c)

BS 7671

d)

Electricity at Work Regs 1989

7.

More than one person working on a circuit requires:

a)

Mortise clasp

b)

Multi-lock hasp

c)

Cable ties

d)

Multi-key lock

8.

Which regulation ensures safe inspection of electrical systems?

a)

EAWR 1989

b)

HSWA 1974

c)

Management of Health & Safety

d)

COSHH

9.

Most serious result of not safely isolating:

a)

Incarceration

b)

Imprisonment

c)

Quick timescales

d)

Death

10.

Purpose of ensuring systems work as intended:

a)

Testing equipment

b)

Inspecting systems

c)

Commissioning systems

d)

Isolating systems

11.

Initial verification confirms compliance with:

a)

BS 7671 in every regard

b)

BS 7671 reasonably practicable

c)

HSE requirements

d)

EAWR 1989

12.

Reason for initial verification:

a)

Correct type & BS

b)

Correct size & BS

c)

Correct rating & BS

d)

Correct colour & BS

13.

Initial verification ensures installation is:

a)

Correctly selected and erected

b)

Finished and sealed

c)

Not defective

d)

Not visibly damaged

14.

Required before initial inspection:

a)

Equipment costing

b)

Earthing system

c)

Maximum demand

d)

Supply characteristics

15.

Most appropriate human senses for testing:

a)

Intuition & speech

b)

Taste & pain

c)

Touch & feel

d)

Touch & sight

16.

Inspection/testing should:

a)

Only after completion

b)

Midway

c)

During & on completion

d)

Within 1 month

17.

Most appropriate to verify initial verification:

a)

Basic protection

b)

Equipment suitability

c)

Termination & cable selection

d)

Storage

18.

Most appropriate in establishing safety:

a)

Fault protection

b)

Basic protection

19.

Correct sequence:

a)

Inspection before testing

b)

Testing before inspection

c)

Testing more important

d)

Inspection more important

20.

Testing results should be compared to:

a)

Other installations

b)

BS 7671

c)

Designer requirements

d)

EAWR

21.

First test in initial verification:

a)

Polarity

b)

Continuity of CPC

c)

Functional

d)

Loop impedance

22.

Fault protection includes:

a)

Earthing Class II

b)

RCD if Ze high

c)

Equipotential bonding

d)

Earthing Class I

23.

CPC continuity important because:

a)

Easier to see

b)

Smaller

c)

Larger

d)

Safety critical

24.

Voltage used to calculate resistance of bonding conductors:

a)

110 V

b)

50 V

c)

400 V

d)

230 V

25.

IR tester setting for 230 V installation:

a)

<50 V

b)

500 V

c)

<500 V

d)

>2× supply but <1000 V

26.

Satisfactory insulation resistance:

a)

<1 Ω

b)

<0.5 MΩ

c)

Not <0.5 MΩ

d)

Not <1 MΩ

27.

Calibration certificates valid for:

a)

3 months

b)

1 year

c)

3 years

d)

5 years

28.

Correct order of dead tests:

a)

CPC → live polarity → loop

b)

CPC → dead polarity → loop

c)

CPC → IR → loop

d)

CPC → IR → polarity

29.

To obtain R1+R2 in ring circuit, r1+r2 must be:

a)

÷4

b)

÷3

c)

÷1.67

d)

×1.67

30.

Ring circuit spurs:

a)

One unfused spur → high readings

b)

Any number unfused → high readings

c)

Any number fused → high readings

d)

One fused → high readings

31.

CPC vs live/neutral ratio for 1 mm² cable:

a)

CPC > neutral

b)

CPC < neutral

c)

CPC > line & neutral

d)

CPC < line & neutral

32.

Tong test instrument =

a)

Continuity tester

b)

Clip-on ammeter

c)

IR tester

d)

Voltage indicator

33.

Dead polarity verifies:

a)

Lampholder outer to line

b)

Lampholder fused

c)

Lampholder centre to neutral

d)

Lampholder centre to line

34.

Circuits in parallel will:

a)

Reduce resistance

b)

Increase resistance

c)

Halve resistance

d)

Double resistance

35.

Increasing length of circuit will:

a)

Reduce IR

b)

Increase IR

c)

Halve IR

d)

Double IR

36.

Before IR test consider:

a)

Sensitive loads removed

b)

Loads & capacitors removed

37.

Circuit IR=1 MΩIR = 1 \text{ M}\Omega according to BS 7671:

a)

Does not comply

b)

Complies

c)

No further investigation

d)

Further investigation required

38.

Polarity definition:

a)

Switching all conductors

b)

Switching line

c)

Switching neutral

d)

Switching CPC

39.

Loop impedance values can be read from:

a)

GN3

b)

BS 7671

c)

OSG

d)

GS38

40.

Total loop impedance obtained by:

a)

Measuring Zs

b)

Enquiry Ze + R1+R2

c)

Enquiry Zs

d)

Measuring Ze + R1+R2

41.

Live polarity tests connect across:

a)

Line–line

b)

Neutral–line

c)

Phase–earth

d)

Line–earth

42.

To check CB breaking capacity, which senses needed?

a)

Touch

b)

Sight

c)

Taste

d)

Sound

43.

Recommended domestic re-test period:

a)

3 months

b)

3 years

c)

5 years

d)

10 years

44.

Two small additions require:

a)

Minor works certificate

b)

Two minor works certificates

c)

One EIC

d)

Two EICs

45.

Following completion of new installation issue:

a)

Test schedule

b)

EICR

c)

EIC

d)

Inspection schedules

46.

Following completion:

a)

Inspector keeps copy of EIC

b)

Inspector keeps original

c)

Customer keeps copy

d)

Customer given original

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