18th Edition Part 4 Mock 2

18th Edition Part 4 Mock 2

Professional Development

10 Qs

quiz-placeholder

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18th Edition Part 4 Mock 2

18th Edition Part 4 Mock 2

Assessment

Quiz

Other

Professional Development

Hard

Created by

Gareth Wyatt

Used 4+ times

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10 questions

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1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Where the transfer of supply to an alternative supply is to take place in a TN system, a multi-pole switch must be used which switches the line and neutral conductors, this method prevents?
a)       Electromagnetic fields due to stray currents in the main supply system
b)       The earth-fault loop impedance exceeding maximum values
c)        The prospective fault current tripping the main protective circuit breaker
d)       The rated residual current tripping any RCD devices

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Simultaneously accessible exposed-conductive parts shall be connected to the same earthing system?
a)       Independent of each system
b)       Individually, in groups or collectively
c)        Not at all
d)       Through a high resistance impedance

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the minimum impulse voltage for 120 V Category II equipment?
a)             1.5 kV
b)          2.5 kV
c)             4.0 kV
d)            6.0kV

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The external influence code CA2 refers to?
a)        Where a building is subject to ground tremors
b)        Where a building is mainly constructed of combustible material e.g. wood
c)        Where a building is subjected to heavy water waves
d)        Where a building is subjected to extreme ultra-violet radiation

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

In an IT system that does not have a neutral conductor it is permitted to omit a device to provide overload protection if?
a)        The DNO supply fuse will provide this protection
b)       The IT earth-impedance is sufficiently high enough
c)         Harmonic currents will not be present
d)        An RCD is installed in each circuit

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A BS 88-2 fuse is to be fitted to a TN circuit with a Zs value of 2.4 Q and requiring a disconnection time of 0.4s What is the maximum rated fuse that couId be used?
a)             25 A
b)          32 A
c)             16 A
d)             20 A

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A temperature cut-out device shall have only?
a)        A manual reset
b)       An automatic reset
c)        A re-settable reset
d)       A master reset

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