Worksheets18th Edition Part 5 Mock 3
Total questions: 10
Worksheet time: 20mins
Name
Class
Date
1.
Where stationary batteries are installed to provide additional means of power in the event of failure of the public supply system, precautions must be taken to prevent inadvertently touching simultaneous conductive parts with a potential difference exceeding?
a)
a) 50 volts
b)
b) 55 volts
c)
c) 60 volts
d)
d) 120 volts
2.
The external influence code 'AN' refers to?
a)
a) The presence of mould or growth
b)
b) The presence of solar and ultraviolet radiation
c)
c) The presence of seismic effects
d)
d) The presence of fauna
3.
What is the k value where steel conduit is used as the protective conductor for 90°C thermosetting cables?
a)
a) 143
b)
b) 47
c)
c) 44
d)
d) 58
4.
For a simple installation a legible diagram indicating the size of conductors must be provided unless?
a)
a) The information is not available
b)
b) A schedule is provided
c)
c) The installer cannot draw
d)
d) The client does not request it
5.
A lighting circuit fitted with an El4 type lampholder must be protected by an overcurrent protective device, of maximum rating?
a)
a) 5 amps
b)
b) 10 amps
c)
c) 10 amps
d)
d) 16 amps
6.
What is the maximum operating temperature for mineral insulated cables, which are not thermoplastic covered and not exposed to touch?
a)
a) 70°c
b)
b) 80°C
c)
c) 90°C
d)
d) 105°C
7.
The minimum cross-sectional area of a buried copper earthing conductor that is not protected against corrosion and not protected against mechanical damage is?
a)
a) 15 mm2
b)
b) 20 mm2
c)
c) 25 mm2
d)
d) 50 mm2
8.
Where may the conductor insulation colour 'Green' be used for live conductors, protective conductors, or functional earthing and bonding conductors?
a)
a) Never
b)
b) Only in a hospital operating theatre on an IT system
c)
c) Only as the protective conductor is safety circuits
d)
d) Only where a fire-fighters switch is used
9.
If the nominal voltage between the line conductor and the neutral conductor in a TN 230/400 V system is 230 volts what is the maximum continuous operating voltage Uc of a SPD (Surge Protection Device)?
a)
a) 415volts
b)
b) 420 volts
c)
c) 430 volts
d)
d) 440 volts
10.
Where a wiring system may be subject to 'a significant quantity of dust' the external influence code is?
a)
a) AC2
b)
b) AD3
c)
c) AE4
d)
d) AF5
100 %
