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If a steel wire armoured cable had an overall diameter of 16mm what would be the maximum spacing of clips on a horizontal run
Frage 2
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If Band 1 and Band 2 circuits are run through the same trunking what special requirements must you achieve?
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Cables to be run in the opposite direction
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Cables are installed in separate compartments
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Are not permitted in Trunking
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Must be able to carry the same colour Live and Neutral conductors
Frage 3
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If the ambient temperature increases the copper cable will
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Increase resistance
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Decrease resistance
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Stay the same
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Will melt
Frage 4
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If the distance of an interactive whiteboard is 2m and the measurement taken is 4cm what is the scale of the drawing
Frage 5
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If the distance of a wall is 4m and the measurement taken by the drawing is 4cm what is the scale
Frage 6
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In a switch started fluorescent tube circuit, the function of the choke when the lamp is lit, is to
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Limit current flowing in the lamp
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Produce a voltage surge across the lamp
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Cause current in the circuit to leap voltage.
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Increase current flow in the circuit
Frage 7
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In electrical systems, the definition of isolation is:
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Placing conductors from each circuit in separate conduit
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Protecting each circuit by a separate circuit breaker
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Cutting off electrical energy from every power source
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Isolating circuits & equipment from the general mass of earth
Frage 8
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In order to determine types of materials and quantities required to complete an electrical installation, an estimator will require:
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Operating sheets & manufacturers' models
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Exploded view diagrams & data sheets
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A technical drawing & data sheet
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Specification & wiring diagram
Frage 9
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For large number of computers installed on a large [LAN] network, what cable would you use?
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Steel wired armour
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Fibre optics
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PVC
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MICC
Frage 10
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On a construction site the voltage to be used for power tools is restricted to
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110V AC
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230V AC
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110V DC
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55V AC
Frage 11
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On site, where a crane is operating overhead, in addition to a safety helmet an electrician should wear
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Face mask
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A high visibility jacket
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Rubber soled shoes
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A donkey jacket
Frage 12
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Operating characteristics information supplied with electric motors by the manufacturers is in the form of:
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Data sheets
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Memoranda
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Circuit diagrams
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Wiring diagrams
Frage 13
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Overload can occur in a circuit if
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A short circuit is present between line and neutral
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The circuit is electrically sound
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Between two conductors at different potentials
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If there is a loose connection of conductors
Frage 14
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PVC & metal conduit are fixed using:
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Crampets
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Spiral fixings
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Cleats
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Saddles
Frage 15
Frage
Solar Thermal installations work on which principle
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Water passes through the panel allowing the generator to rotate.
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Wind hits the panels and creates an electro motive force through the semiconductor material
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Sun hits the panels and warms up the water.
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Sun hits the panels and turn into electricity
Frage 16
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The British Standard for a cartridge fuse used in 13A plug tops
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BS 88
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BS 1361
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BS 1362
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BS 3036
Frage 17
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The cables that connect between two 2 way switches are said to be called
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Switch wires
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Strippers
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Switch lines
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Strappers
Frage 18
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The distribution supply cable to a building is usually:
Frage 19
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The earthing arrangement when incoming supply cable sheath provides an independent earth is
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TN - C
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TT
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TN - S
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TN - C - S
Frage 20
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The main reason to fix cable to walls on horizontal runs using appropriate clips at suitable intervals is to prevent:
Frage 21
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The maximum disconnection time for a circuit over 32A is
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1 second
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0.4 seconds
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0.2 seconds
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5 seconds
Frage 22
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The maximum number of accidents on a construction site is due to
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Falling/tripping/manual handling
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Falling/manual handling/use of equipment
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Tripping/manul handling/use of equipment
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Use of materials/falling/manual handling
Frage 23
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The maximum span between buildings for unjointed 25mm diameter steel conduit is
Frage 24
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The most accurate method of forming right angle bends in steel conduit is:
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A vice and heat source
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A wooden block
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The knee
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A bending machine
Frage 25
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The most important factor when selecting a cable of known rating is:
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Colour of insulation
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The temperature of operation
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Shape of the outer sheath
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Distance between cable cores
Frage 26
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The purpose of the day work sheet is to record
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All worked hours
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Hours worked in addition to the main contract
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All work to be carried out in one day
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Any work related expenses to be claimed from petty cash
Frage 27
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The purpose of the pvc sheath on a pvc/pvc multicore cable is to
Frage 28
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The rating of an RCD installed to provide additional protection for equipment used outside the main equipotential zone is?
Frage 29
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The standard transmission high voltage is
Frage 30
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The stop button used to allow isolation of electrical equipment for maintenance must:
Frage 31
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The symbol Ca is used to represent which rating factor
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Thermal Insulation
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Installation Condition
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Ambient temperature
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Grouping
Frage 32
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To mark out metal trunking for cutting, you would use:
Frage 33
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Vertical & horizontal runs of trunking must be adequately supported to:
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Provide earth continuity
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Avoid stress & damage to the cable
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Prevent possible fire damage
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Prevent distortion to the trunking
Frage 34
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Which cable type is most suitable for cable cleats?
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Singles
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Steel wire armoured
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MICC
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PVC/PVC/CPC
Frage 35
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What conductor is used to connect to extraneous conductive parts?
Frage 36
Frage
What does the following picture show?
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Spacer Bar Saddle
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Cable Cleat
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Hospital Saddle
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Crampet
Frage 37
Frage
What fixings would be used on a hollow partition wall?
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Rawl plug
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Spring toggle
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Screw
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Cable cleat
Frage 38
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What fixings would be used on a brick wall?
Frage 39
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What form of switching is used on a security system?
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Relay
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Contactor
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Direct on line starter
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One way switch
Frage 40
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What is the conduit factor for a 4m 20mm conduit which incorporates two bends?