2815380
Descripción
Test por Oliver Balay, actualizado hace más de 1 año
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Creado por Oliver Balay
hace casi 9 años
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Pregunta 1
Respuesta
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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
Pregunta 2
Pregunta
A cable has resistance of 0.12 ohms and a current of 30A. The volt drop due to resistance is
Respuesta
-
10.6V
-
3.6V
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2.6V
-
7.6V
Pregunta 3
Pregunta
A circuit supplying kitchen appliances would be identified as
Respuesta
-
Heating
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Cooker
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Lighting
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Power
Pregunta 4
Pregunta
A circuit to supply hot water would be identified as
Respuesta
-
Floor warming installations
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Heating
-
Power
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Motor
Pregunta 5
Pregunta
A common method of providing protection by fault protection
Respuesta
-
ADS (Automatic disconnection of supply)
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Enclosures
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Placing out of reach
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Insulation
Pregunta 6
Pregunta
A method of protection against electric shock is provided in a cable by
Respuesta
-
RCDs
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Barriers
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Automatic Disconnection of Supply (ADS)
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Insulation
Pregunta 7
Pregunta
A work plan for new installations provides:
Respuesta
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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
Pregunta 8
Pregunta
A requirement for safety that all installations should have is
Respuesta
-
Overcurrent protection
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Energy meter
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Fire alarm
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Indication of supply failure
Pregunta 9
Respuesta
-
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
Pregunta 10
Respuesta
-
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
Pregunta 11
Pregunta
A typical system application for fibre optic cable is:
Respuesta
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Fire alarms
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Data communications
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Emergency management
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Environmental control
Pregunta 12
Pregunta
A voltage of 400kV represents the following voltage
Respuesta
-
0.4V
-
40000V
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0.04V
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400000V
Pregunta 13
Pregunta
Aluminium may be used as a conductor in preference to copper as it is
Respuesta
-
Less likely to corrode
-
Is lighter
-
Is easier to terminate
-
Is a better conductor
Pregunta 14
Pregunta
Aluminium spiral fixings are used to fix items on
Respuesta
-
Concrete
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Brick
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Roof tiles
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Plaster board
Pregunta 15
Pregunta
An Earthing system that uses a separate conductor as a return path for any fault current is called
Respuesta
-
TN-C-S
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TT
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TN-S
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IT
Pregunta 16
Respuesta
-
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
Pregunta 17
Pregunta
An RCD is a device used to protect circuits against
Respuesta
-
Overload and Earth faults
-
Earth faults only
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Overload and Short Circuits
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Short circuit only
Pregunta 18
Pregunta
Automatic disconnection of supply and special locations are found in
Respuesta
-
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
Pregunta 19
Respuesta
-
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
Pregunta 20
Respuesta
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Cannot be tampered with
-
Are accurate at determining overload current
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Will not cause damage in the event of severe short circuit
-
Have a re-wireable element
Pregunta 21
Pregunta
Circuit breakers are frequently installed in preference to fuses because
Respuesta
-
They are adjustable
-
They do not need replacing after operation
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They are less sensitive to some types of fault
-
They are cheaper than fuses
Pregunta 22
Pregunta
Circuit breakers use two forms of operation
Respuesta
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Thermal and magnetic
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Thermal and bi- metallic strip
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Fuse element and magnetic
-
Thermal and fuse element
Pregunta 23
Pregunta
Define the term for a Circuit Protective Conductor (CPC)
Respuesta
-
A cable that links all extraneous conductive parts backs to the MET
-
It is the cable that connects from the MET to the star point of the sub station
-
It relates to the types of dangerous gases that are released into the atmosphere
-
A cable that links all exposed conductive parts back to the MET
Pregunta 24
Pregunta
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).
Respuesta
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16mm
-
20mm
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25mm
-
32mm
Pregunta 25
Pregunta
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).
Respuesta
-
20mm
-
16mm
-
32mm
-
25mm
Pregunta 26
Pregunta
Equipment identified in BS 7671 by an EN number must comply with the relevant requirements of:
Respuesta
-
Extra neutral provision
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European standards
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Economic standards
-
English standards
Pregunta 27
Pregunta
ES lamp holders, the outer casing must be connected to
Respuesta
-
Neutral conductor
-
Line conductor
-
Earth conductor
-
All conductors
Pregunta 28
Pregunta
Excess current, flowing in a circuit which is electrically sound, is defined as
Respuesta
-
Short-circuit current
-
Earth fault current
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Open-circuit current
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Overload current
Pregunta 29
Pregunta
From BS 7671 the disconnection time for circuits supplying equipment and circuits up to 32A is :
Respuesta
-
0.2s
-
0.04s
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0.4s
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5s
Pregunta 30
Pregunta
What does Ze represent from the following formula Zs = Ze + (R1 + R2)?
Respuesta
-
Internal Earth Fault Loop Impedance
-
Resistance of the circuit protective conductor
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External Earth Fault Loop Impedance
-
Resistance of the line conductor
Pregunta 31
Pregunta
What does R1 represent from the following formula Zs = Ze + (R1 + R2)?
Respuesta
-
Design Current
-
Resistance of the circuit protective conductor
-
Resistance of the line conductor
-
External Earth Fault Loop Impedance
Pregunta 32
Pregunta
From the On-site-Guide the maximum external earth loop impedance for a TN-C-S system is?
Respuesta
-
0.08 ohms
-
0.8 ohms
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0.85 ohms
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0.35 ohms
Pregunta 33
Pregunta
From the On-site-Guide the maximum external earth loop impedance for a TN-S system is?
Respuesta
-
0.8 ohms
-
0.75 ohms
-
0.35 ohms
-
0.08 ohms
Pregunta 34
Pregunta
Holes between joists must be of a minimum distance from top or bottom fixing surface of
Respuesta
-
10mm
-
20mm
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50mm
-
60mm
Pregunta 35
Pregunta
Identify the distribution voltage for a large story building with a private transformer
Respuesta
-
11kv
-
400v
-
110v
-
12v
Pregunta 36
Pregunta
IET Wiring regulations give directives on electrical installations in hazardous environments, however the statutory governing these situations are covered in the:
Respuesta
-
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
Pregunta 37
Pregunta
IET Wiring regulations apply particularly to:
Respuesta
-
Mining industry
-
All branches of industry
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Electrical manufacturing industry
-
Electrical contracting industry
Pregunta 38
Pregunta
IET Wiring regulations recommend inspection of temporary construction site installation every:
Respuesta
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1 month
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3 months
-
12 months
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24 months
Pregunta 39
Pregunta
If a 20mm steel conduit was to be installed horizontally what would be the maximum spacing of supports
Respuesta
-
1.00m
-
1.75m
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2.25m
-
0.75m
Pregunta 40
Pregunta
If a 30A fuse has a tripping characteristic of 5 x In, what would be the instantaneous tripping current?
Respuesta
-
30A
-
600A
-
150A
-
60A
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