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Quiz von Oliver Balay, aktualisiert more than 1 year ago
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Erstellt von Oliver Balay
vor mehr als 9 Jahre
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Frage 1
Antworten
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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
Frage 2
Frage
A cable has resistance of 0.12 ohms and a current of 30A. The volt drop due to resistance is
Antworten
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10.6V
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3.6V
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2.6V
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7.6V
Frage 3
Frage
A circuit supplying kitchen appliances would be identified as
Antworten
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Heating
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Cooker
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Lighting
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Power
Frage 4
Frage
A circuit to supply hot water would be identified as
Antworten
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Floor warming installations
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Heating
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Power
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Motor
Frage 5
Frage
A common method of providing protection by fault protection
Antworten
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ADS (Automatic disconnection of supply)
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Enclosures
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Placing out of reach
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Insulation
Frage 6
Frage
A method of protection against electric shock is provided in a cable by
Antworten
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RCDs
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Barriers
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Automatic Disconnection of Supply (ADS)
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Insulation
Frage 7
Frage
A work plan for new installations provides:
Antworten
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Cost of materials
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Estimates of timescale
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Safety information
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Instructions for all workers
Frage 8
Frage
A requirement for safety that all installations should have is
Antworten
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Overcurrent protection
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Energy meter
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Fire alarm
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Indication of supply failure
Frage 9
Antworten
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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
Frage 10
Antworten
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The line and neutral conductors
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The neutral conductor
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The circuit protective conductor
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The line conductor
Frage 11
Frage
A typical system application for fibre optic cable is:
Antworten
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Fire alarms
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Data communications
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Emergency management
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Environmental control
Frage 12
Frage
A voltage of 400kV represents the following voltage
Antworten
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0.4V
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40000V
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0.04V
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400000V
Frage 13
Frage
Aluminium may be used as a conductor in preference to copper as it is
Antworten
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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
Frage 14
Frage
Aluminium spiral fixings are used to fix items on
Antworten
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Concrete
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Brick
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Roof tiles
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Plaster board
Frage 15
Frage
An Earthing system that uses a separate conductor as a return path for any fault current is called
Antworten
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TN-C-S
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TT
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TN-S
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IT
Frage 16
Antworten
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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
Frage 17
Frage
An RCD is a device used to protect circuits against
Antworten
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Overload and Earth faults
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Earth faults only
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Overload and Short Circuits
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Short circuit only
Frage 18
Frage
Automatic disconnection of supply and special locations are found in
Antworten
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BS 7671
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Electricity at Work Regulations
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Jane Austin Novel
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Health and Safety Policy
Frage 19
Antworten
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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
Frage 20
Antworten
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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
Frage 21
Frage
Circuit breakers are frequently installed in preference to fuses because
Antworten
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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
Frage 22
Frage
Circuit breakers use two forms of operation
Antworten
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Thermal and magnetic
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Thermal and bi- metallic strip
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Fuse element and magnetic
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Thermal and fuse element
Frage 23
Frage
Define the term for a Circuit Protective Conductor (CPC)
Antworten
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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
Frage 24
Frage
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).
Antworten
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16mm
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20mm
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25mm
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32mm
Frage 25
Frage
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).
Antworten
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20mm
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16mm
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32mm
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25mm
Frage 26
Frage
Equipment identified in BS 7671 by an EN number must comply with the relevant requirements of:
Antworten
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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
Frage 27
Frage
ES lamp holders, the outer casing must be connected to
Antworten
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Neutral conductor
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Line conductor
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Earth conductor
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All conductors
Frage 28
Frage
Excess current, flowing in a circuit which is electrically sound, is defined as
Antworten
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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
Frage 29
Frage
From BS 7671 the disconnection time for circuits supplying equipment and circuits up to 32A is :
Antworten
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0.2s
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0.04s
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0.4s
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5s
Frage 30
Frage
What does Ze represent from the following formula Zs = Ze + (R1 + R2)?
Antworten
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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
Frage 31
Frage
What does R1 represent from the following formula Zs = Ze + (R1 + R2)?
Antworten
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Design Current
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Resistance of the circuit protective conductor
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Resistance of the line conductor
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External Earth Fault Loop Impedance
Frage 32
Frage
From the On-site-Guide the maximum external earth loop impedance for a TN-C-S system is?
Antworten
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0.08 ohms
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0.8 ohms
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0.85 ohms
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0.35 ohms
Frage 33
Frage
From the On-site-Guide the maximum external earth loop impedance for a TN-S system is?
Antworten
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0.8 ohms
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0.75 ohms
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0.35 ohms
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0.08 ohms
Frage 34
Frage
Holes between joists must be of a minimum distance from top or bottom fixing surface of
Antworten
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10mm
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20mm
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50mm
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60mm
Frage 35
Frage
Identify the distribution voltage for a large story building with a private transformer
Antworten
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11kv
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400v
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110v
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12v
Frage 36
Frage
IET Wiring regulations give directives on electrical installations in hazardous environments, however the statutory governing these situations are covered in the:
Antworten
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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
Frage 37
Frage
IET Wiring regulations apply particularly to:
Antworten
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Mining industry
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All branches of industry
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Electrical manufacturing industry
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Electrical contracting industry
Frage 38
Frage
IET Wiring regulations recommend inspection of temporary construction site installation every:
Antworten
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1 month
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3 months
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12 months
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24 months
Frage 39
Frage
If a 20mm steel conduit was to be installed horizontally what would be the maximum spacing of supports
Antworten
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1.00m
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1.75m
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2.25m
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0.75m
Frage 40
Frage
If a 30A fuse has a tripping characteristic of 5 x In, what would be the instantaneous tripping current?
Antworten
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30A
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600A
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150A
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60A
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