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Worksheets2365-203 Electrical Installation
Total questions: 40
Worksheet time: 20mins
The symbol for Total earth loop impedance is?
Zs
Ib
Iz
Ze
The insulation material in mineral insulated cable is
manganese oxide
magnesium dioxide
manganese dioxide
magnesium oxide
What is the maximum percentage of trunking that can be filled with cable:
35%
45%
55%
65%
Which one of the following directly affects all persons working with electricity in a working environment?
Electricity Safety, Quality and Continuity Regulations
BS 7671:2018
Electricity at Work Regulations
Construction design and management Regulations
A drawing is produced to a scale of 1:50 showing a socket outlet installed 3.5cm from the corner of a room. Which one of the following is the actual distance from the corner in the room?
0.875m
1.75m
3.5m
7m
Which one of the following symbols represents the rating factor for thermal insulation
Ci
Ca
Cf
Cg
Which one of the following devices is suitable for an installation supplying an Xray machine in a hospital?
BS 3036 rewireable fuse
BS EN 60898 Type D
BS EN 60898 Type C
BS EN 60898 Type B
Which one of the following is the minimum conduit size suitable for a short straight run containing the following stranded cables: 4x1.5mm^2 and 3x2.5mm^2?
16mm
20mm
25mm
32mm
Which one of the following is the conduit capacity factor to be used where a 25mm conduit has 2 bend in a 6m run?
111
182
333
600
Which one of the following is the correct name of the component which links the main earthing terminal of an installation to the means of earthing?
Main protective bonding conductor
Supplementary equipotential bond
Earthing conductor
Functional earth
What is represented by Zs in the following formula: Zs=Ze+(R1+R2)?
Total earth fault loop impedance
External earth fault loop impedance
Final circuit earth fault loop impedance
Combined resistance of the earth path
What is represented by Ze in the following formula: Zs=Ze+(R1+R2)?
Total earth fault loop impedance
External earth fault loop impedance
Final circuit earth fault loop impedance
Combined resistance of the earth path
What is represented by R1 in the following formula: Zs=Ze+(R1+R2)?
Resistance in the line conductor
Resistance in the earth conductor
Total earth fault loop impedance
External earth fault loop impedance
Which one of the following is an exposed conductive part?
Metal-clad switch
Structural steelwork
Air conditioning ducting
Metallic oil service pipe
Which one of the following is metal cable trunking?
Earthed conductive part
Extraneous conductive part
Insulated part
Exposed conductive part
Which one of the following is an extraneous conductive part?
Metallic gas service pipe
Metal-clad twin socket outlet
Heavy duty steel conduit
PVC mini-trunking
Which one of the following methods of generating electricity uses fossil fuels?
Wave power
Solar
Gas
Wind
Which one of the following uses sunlight to generate electricity?
Photo-voltaic
Biomass
Wind
Air source heat pump
Which one of the following is a transmission voltage?
400kV
33kV
11kV
400V
Which one of the following is a typical distribution voltage for a medium-sized factory where a private sub-station is located?
230V
400V
5kV
11kV
Which one of the following describes the process of a solar photo-voltaic system?
Solar power is used to ignite a biomass which heats up water
Solar power is collected by a solar panel which provides electricity
Solar power is collected by a solar panel which provides hot water
Solar power causes hot air to rise, rotating a generator that produces electricity
State the protective device rating for an A3 radial final circuit.
20A
32A
30A
6A
The number of outlets that can be connected to an A1 ring final circuit is unlimited provided that the floor area served does not exceed:
100m^2
75m^2
50m^2
25m^2
