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Electrical testing MCQs (NETK3-06 style) extracted

Total questions: 45

Worksheet time: 23mins

Name
Class
Date
1.

What is the purpose of continuity testing on CPCs?

a)

Check voltage drop

b)

Confirm CPC is continuous

c)

Test RCDs

d)

Measure PSC

2.

Which instrument is used to measure insulation resistance?

a)

Loop tester

b)

Multimeter

c)

Insulation resistance tester

d)

RCD tester

3.

What is the standard insulation resistance test voltage for a 230 V circuit?

a)

100 V

b)

250 V

c)

500 V

d)

1000 V

4.

What is the minimum acceptable insulation resistance value for a 230 V circuit tested at 500 V?

a)

0.25 MΩ

b)

0.5 MΩ

c)

1 MΩ

d)

2 MΩ

5.

What does Zs represent?

a)

Resistance of CPC

b)

Total earth fault loop impedance

c)

External loop impedance

d)

Voltage drop

6.

What does Ze represent?

a)

Final circuit impedance

b)

PSC

c)

External earth fault loop impedance

d)

Bonding resistance

7.

What is the formula for earth fault current?

a)

Zs ÷ U0

b)

U0 × Zs

c)

U0 ÷ Zs

d)

Zs × 2

8.

What does R1+R2 testing verify?

a)

Polarity and CPC continuity

b)

PSC

c)

RCD operation

d)

Voltage drop

9.

R1+R2 testing must be carried out:

a)

Live

b)

Dead

c)

At 500 V

d)

With load connected

10.

What does polarity testing confirm?

a)

Correct CPC size

b)

Line conductor is on line terminal

c)

Correct Ze

d)

Correct bonding

11.

Which test must be completed before energising?

a)

Zs

b)

RCD

c)

CPC continuity

d)

PSC

12.

What does PFC stand for?

a)

Protective fuse current

b)

Prospective fault current

c)

Primary fault current

d)

Protective conductor fault

13.

PSC refers to:

a)

Prospective short-circuit current

b)

Protective system current

c)

Phase sequence current

d)

Primary supply current

14.

Purpose of main protective bonding?

a)

Reduce Zs

b)

Equalise potential

c)

Improve IR

d)

Reduce PSC

15.

Max disconnection time for a 230 V socket circuit?

a)

0.1 s

b)

0.2 s

c)

0.4 s

d)

5 s

16.

Max disconnection time for a distribution circuit?

a)

0.4 s

b)

1 s

c)

5 s

d)

10 s

17.

RCDs primarily protect against:

a)

Overcurrent

b)

Short circuits

c)

Earth leakage

d)

Voltage drop

18.

Test current for a 30 mA RCD at ×1?

a)

15 mA

b)

30 mA

c)

45 mA

d)

150 mA

19.

Max trip time for a 30 mA RCD at ×1?

a)

40 ms

b)

200 ms

c)

300 ms

d)

500 ms

20.

Purpose of a visual inspection?

a)

Test Zs

b)

Identify defects before testing

c)

Measure IR

d)

Test RCDs

21.

First step before testing?

a)

Record results

b)

Notify client

c)

Isolate supply

d)

Test RCD

22.

Purpose of dead testing?

a)

Test live circuits

b)

Ensure safety before energising

c)

Measure PSC

d)

Test RCDs

23.

Which is a live test?

a)

Continuity

b)

IR

c)

Polarity (dead)

d)

Zs

24.

A high Zs value indicates:

a)

Good earth path

b)

Poor earth path

c)

High IR

d)

Correct polarity

25.

Purpose of functional testing?

a)

Check operation of devices

b)

Measure resistance

c)

Test bonding

d)

Check IR

26.

Minimum IR value for SELV circuits?

a)

0.25 MΩ

b)

0.5 MΩ

c)

1 MΩ

d)

2 MΩ

27.

Purpose of verifying ring continuity?

a)

Check polarity

b)

Confirm ring is complete

c)

Measure Zs

d)

Test RCDs

28.

Correct order of dead tests?

a)

IR → R1+R2 → Polarity

b)

Polarity → IR → R1+R2

c)

Continuity → IR → Polarity

d)

Zs → IR → Continuity

29.

Purpose of measuring R2?

a)

CPC continuity

b)

Voltage drop

c)

RCD testing

d)

Polarity

30.

A loop tester measures:

a)

IR

b)

Zs

c)

RCD trip time

d)

Voltage drop

31.

Purpose of a calibration certificate?

a)

Prove tester is new

b)

Confirm accuracy

c)

Show insurance

d)

Check polarity

32.

Acceptable tolerance for R1+R2 readings?

a)

±1%

b)

±5%

c)

±10%

d)

No tolerance

33.

Purpose of a test schedule?

a)

Record results

b)

Calculate Zs

c)

Test RCDs

d)

Check bonding

34.

Purpose of a risk assessment?

a)

Reduce Zs

b)

Identify hazards

c)

Check polarity

d)

Test IR

35.

Purpose of verifying supply polarity?

a)

Check CPC size

b)

Confirm live and neutral correct

c)

Measure PSC

d)

Test bonding

36.

A high PSC value indicates:

a)

High resistance

b)

Low resistance

c)

Poor bonding

d)

Incorrect polarity

37.

Purpose of verifying voltage drop?

a)

Ensure safe disconnection

b)

Ensure equipment operates correctly

c)

Test IR

d)

Check bonding

38.

Purpose of a minor works certificate?

a)

New installations

b)

Additions or alterations

c)

Periodic inspection

d)

RCD testing

39.

Purpose of an EICR?

a)

Certify new work

b)

Report condition of installation

c)

Test RCDs

d)

Measure Zs

40.

Code for immediate danger on an EICR?

a)

C1

b)

C2

c)

C3

d)

FI

41.

A circuit has U0 = 230 V and Zs = 0.92 Ω. What is the earth fault current?

a)

150 A

b)

200 A

c)

250 A

d)

300 A

42.

A ring final circuit has end-to-end readings: R1 = 0.52 Ω, RN = 0.52 Ω, R2 = 0.88 Ω. Expected R1+R2 at a socket?

a)

0.35 Ω

b)

0.45 Ω

c)

0.60 Ω

d)

0.70 Ω

43.

When testing a circuit containing electronic equipment, the IR test voltage should be:

a)

100 V

b)

250 V

c)

500 V

d)

1000 V

44.

A TN-C-S installation has Ze = 0.28 Ω. What is the PFC at 230 V?

a)

450 A

b)

650 A

c)

820 A

d)

1000 A

45.

Which test confirms the line conductor is connected to the correct terminal?

a)

Continuity

b)

Polarity

c)

IR

d)

Zs

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