An insulation resistance test is carried out on a circuit in 2.5/1.5 mm² cable, supplying a heater. If the value of insulation resistance between live conductors is 300 MΩ, the expected value between live and earth would be

Inspection & Testing 1

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Professional Development
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Professional Development
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Medium
Sayed Habib
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27 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
a) 100 MΩ
b) 300 MΩ
c) 500 MΩ
d) 1000 MΩ
Answer explanation
The expected value between live and earth is typically one-third of the insulation resistance between live conductors, so it would be 100 MΩ (300 MΩ / 3 = 100 MΩ). Therefore, the correct choice is a) 100 MΩ.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If the length of a cable is doubled the insulation resistance will
a) Be doubled
b) Remain the same
c) Be halved
d) Be quartered
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which one of the following tests is carried out to conform that all accessories are correctly connected?
a) Polarity
b) RCD function
c) Phase sequence
d) Additional Protection
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The continuity of circuit protective conductors should be verified and recorded using
a) A continuity tester
b) A high resistance ohmmeter
c) An earth fault impedance tester
d) A low resistance ohmmeter
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A test of insulation resistance on a number of circuits produces the following results: 10 MΩ, 5 MΩ, 4 MΩ and 2 MΩ. The insulation resistance measured at the distribution board, with all the circuits connected in parallel will be
a) 26 MΩ
b) 10 MΩ
c) 5.2 MΩ
d) 0.8 MΩ
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The measurement of conductor resistance would not be affected by the
a) Thickness of conductor insulation
b) Conductor temperature
c) Conductor csa
d) Conductor length
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which one of the following, for reason of safety, should be verify prior to conducting test of an RCD using an RCD test instrument?
a) Suitably low earth fault loop impedance
b) Suitable insulation resistance values
c) The operation of the RCD integral test button
d) The prospective fault current at the point where the RCD is fitted
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