2815380
Descrição
Quiz por Oliver Balay, atualizado more than 1 year ago
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Criado por Oliver Balay
quase 9 anos atrás
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Questão 1
Responda
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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
Questão 2
Questão
A cable has resistance of 0.12 ohms and a current of 30A. The volt drop due to resistance is
Responda
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10.6V
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3.6V
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2.6V
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7.6V
Questão 3
Questão
A circuit supplying kitchen appliances would be identified as
Responda
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Heating
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Cooker
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Lighting
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Power
Questão 4
Questão
A circuit to supply hot water would be identified as
Responda
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Floor warming installations
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Heating
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Power
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Motor
Questão 5
Questão
A common method of providing protection by fault protection
Responda
-
ADS (Automatic disconnection of supply)
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Enclosures
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Placing out of reach
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Insulation
Questão 6
Questão
A method of protection against electric shock is provided in a cable by
Responda
-
RCDs
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Barriers
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Automatic Disconnection of Supply (ADS)
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Insulation
Questão 7
Questão
A work plan for new installations provides:
Responda
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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
Questão 8
Questão
A requirement for safety that all installations should have is
Responda
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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
Questão 9
Responda
-
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
Questão 10
Responda
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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
Questão 11
Questão
A typical system application for fibre optic cable is:
Responda
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Fire alarms
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Data communications
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Emergency management
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Environmental control
Questão 12
Questão
A voltage of 400kV represents the following voltage
Responda
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0.4V
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40000V
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0.04V
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400000V
Questão 13
Questão
Aluminium may be used as a conductor in preference to copper as it is
Responda
-
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
Questão 14
Questão
Aluminium spiral fixings are used to fix items on
Responda
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Concrete
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Brick
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Roof tiles
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Plaster board
Questão 15
Questão
An Earthing system that uses a separate conductor as a return path for any fault current is called
Responda
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TN-C-S
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TT
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TN-S
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IT
Questão 16
Responda
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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
Questão 17
Questão
An RCD is a device used to protect circuits against
Responda
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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
Questão 18
Questão
Automatic disconnection of supply and special locations are found in
Responda
-
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
Questão 19
Responda
-
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
Questão 20
Responda
-
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
Questão 21
Questão
Circuit breakers are frequently installed in preference to fuses because
Responda
-
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
Questão 22
Questão
Circuit breakers use two forms of operation
Responda
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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
Questão 23
Questão
Define the term for a Circuit Protective Conductor (CPC)
Responda
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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
Questão 24
Questão
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).
Responda
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16mm
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20mm
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25mm
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32mm
Questão 25
Questão
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).
Responda
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20mm
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16mm
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32mm
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25mm
Questão 26
Questão
Equipment identified in BS 7671 by an EN number must comply with the relevant requirements of:
Responda
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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
Questão 27
Questão
ES lamp holders, the outer casing must be connected to
Responda
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Neutral conductor
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Line conductor
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Earth conductor
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All conductors
Questão 28
Questão
Excess current, flowing in a circuit which is electrically sound, is defined as
Responda
-
Short-circuit current
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Earth fault current
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Open-circuit current
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Overload current
Questão 29
Questão
From BS 7671 the disconnection time for circuits supplying equipment and circuits up to 32A is :
Responda
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0.2s
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0.04s
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0.4s
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5s
Questão 30
Questão
What does Ze represent from the following formula Zs = Ze + (R1 + R2)?
Responda
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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
Questão 31
Questão
What does R1 represent from the following formula Zs = Ze + (R1 + R2)?
Responda
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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
Questão 32
Questão
From the On-site-Guide the maximum external earth loop impedance for a TN-C-S system is?
Responda
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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
Questão 33
Questão
From the On-site-Guide the maximum external earth loop impedance for a TN-S system is?
Responda
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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
Questão 34
Questão
Holes between joists must be of a minimum distance from top or bottom fixing surface of
Responda
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10mm
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20mm
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50mm
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60mm
Questão 35
Questão
Identify the distribution voltage for a large story building with a private transformer
Responda
-
11kv
-
400v
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110v
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12v
Questão 36
Questão
IET Wiring regulations give directives on electrical installations in hazardous environments, however the statutory governing these situations are covered in the:
Responda
-
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
Questão 37
Questão
IET Wiring regulations apply particularly to:
Responda
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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
Questão 38
Questão
IET Wiring regulations recommend inspection of temporary construction site installation every:
Responda
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1 month
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3 months
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12 months
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24 months
Questão 39
Questão
If a 20mm steel conduit was to be installed horizontally what would be the maximum spacing of supports
Responda
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1.00m
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1.75m
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2.25m
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0.75m
Questão 40
Questão
If a 30A fuse has a tripping characteristic of 5 x In, what would be the instantaneous tripping current?
Responda
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30A
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600A
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150A
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60A
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