Question 1
Question
A BS3036 protective device is a
Answer
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Rewireable fuse
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Cartridge fuse
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Type B MCB
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Type C MCB
Question 2
Question
A circuit supplying kitchen appliances would be identified as
Answer
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Heating
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Cooker
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Lighting
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Power
Question 3
Question
A circuit to supply hot water would be identified as
Question 4
Question
A common method of providing protection by fault protection
Question 5
Question
A method of protection against electric shock is provided in a cable by
Question 6
Question
A work plan for new installations provides:
Question 7
Question
A requirement for safety that all installations should have is
Question 8
Question
A short circuit occurs
Answer
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Between two conductors on the same phase
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Between two conductors at different potential
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Between two conductors at the same potential
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In a circuit that is electrically sound
Question 9
Question
A single pole switch breaks
Question 10
Question
A typical system application for fibre optic cable is:
Answer
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Fire alarms
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Data communications
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Emergency management
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Environmental control
Question 11
Question
A voltage of 400kV represents the following voltage
Answer
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0.4V
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40000V
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0.04V
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400000V
Question 12
Question
Aluminium may be used as a conductor in preference to copper as it is
Answer
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Less likely to corrode
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Is lighter
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Is easier to terminate
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Is a better conductor
Question 13
Question
Aluminium spiral fixings are used to fix items on
Answer
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Concrete
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Brick
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Roof tiles
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Plaster board
Question 14
Question
An Earthing system that uses a separate conductor as a return path for any fault current is called
Question 15
Question
An example of overload is
Answer
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A 13 amp socket outlet with a 100W lamp connected
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A 13amp socket outlet with a 2kW fire connected to it
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A lighting circuit with a 100W lamp connected
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A lighting circuit with a 2 kW heater connected
Question 16
Question
An RCD is a device used to protect circuits against
Question 17
Question
Automatic disconnection of supply and special locations are found in
Question 18
Question
Best location for a solar panel
Answer
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On the roof of a building facing north
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On the side of a chimney
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On the shaded part of the roof
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On the roof of a building facing south
Question 19
Answer
-
Cannot be tampered with
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Are accurate at determining overload current
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Will not cause damage in the event of severe short circuit
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Have a re-wireable element
Question 20
Question
Circuit breakers are frequently installed in preference to fuses because
Answer
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They are adjustable
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They do not need replacing after operation
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They are less sensitive to some types of fault
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They are cheaper than fuses
Question 21
Question
Circuit breakers use two forms of operation
Question 22
Question
Define the term for a Circuit Protective Conductor (CPC)
Answer
-
A cable that links all extraneous conductive parts backs to the MET
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It is the cable that connects from the MET to the star point of the sub station
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It relates to the types of dangerous gases that are released into the atmosphere
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A cable that links all exposed conductive parts back to the MET
Question 23
Question
Determine the size of conduit required for a run of 2.7m, if you are installing 3 x 1.5mm² and 6 x 6mm² conductors (all stranded).
Question 24
Question
Determine the size of conduit required for a run of 2.9m, if you are installing 9 x 2.5mm² and 3 x 6mm² conductors (all stranded).
Question 25
Question
Equipment identified in BS 7671 by an EN number must comply with the relevant requirements of:
Answer
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Extra neutral provision
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European standards
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Economic standards
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English standards
Question 26
Question
ES lamp holders, the outer casing must be connected to
Answer
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Neutral conductor
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Line conductor
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Earth conductor
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All conductors
Question 27
Question
Excess current, flowing in a circuit which is electrically sound, is defined as
Answer
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Short-circuit current
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Earth fault current
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Open-circuit current
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Overload current
Question 28
Question
From BS 7671 the disconnection time for circuits supplying equipment and circuits up to 32A is :
Question 29
Question
What does Ze represent from the following formula Zs = Ze + (R1 + R2)?
Answer
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Internal Earth Fault Loop Impedance
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Resistance of the circuit protective conductor
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External Earth Fault Loop Impedance
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Resistance of the line conductor
Question 30
Question
What does R1 represent from the following formula Zs = Ze + (R1 + R2)?
Answer
-
Design Current
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Resistance of the circuit protective conductor
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Resistance of the line conductor
-
External Earth Fault Loop Impedance
Question 31
Question
From the On-site-Guide the maximum external earth loop impedance for a TN-C-S system is?
Answer
-
0.08 ohms
-
0.8 ohms
-
0.85 ohms
-
0.35 ohms
Question 32
Question
From the On-site-Guide the maximum external earth loop impedance for a TN-S system is?
Answer
-
0.8 ohms
-
0.75 ohms
-
0.35 ohms
-
0.08 ohms
Question 33
Question
Holes between joists must be of a minimum distance from top or bottom fixing surface of
Question 34
Question
Identify the distribution voltage for a large story building with a private transformer
Question 35
Question
IET Wiring regulations give directives on electrical installations in hazardous environments, however the statutory governing these situations are covered in the:
Answer
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British Standards
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Electricity at Work Regulations 1989
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Approved Codes of Practice
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Health & Safety at Work Act 1974
Question 36
Question
IET Wiring regulations apply particularly to:
Question 37
Question
IET Wiring regulations recommend inspection of temporary construction site installation every:
Answer
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1 month
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3 months
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12 months
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24 months
Question 38
Question
If a 20mm steel conduit was to be installed horizontally what would be the maximum spacing of supports
Question 39
Question
If a 30A fuse has a tripping characteristic of 5 x In, what would be the instantaneous tripping current?
Question 40
Question
A cable has resistance of 0.12 ohms and a current of 30A. The volt drop due to resistance is