WorksheetsTechnology - Quiz 3
Total questions: 45
Worksheet time: 4hrs 45mins
What does the symbol represent?
A one-way switch
An unswitched socket outlet
A two-way switch
A switched socket outlet
What information do block diagrams contain?
A graphical method used to show the component symbols
A graphical method used to explain the concept of a system
A graphical method used to show the detailed connection of components
A graphical method used to show the scaled position of components
Not following the recommendations within BS7671 can result in
A dangerous situation
A safe code of practice
Compliance with regulations
A safe system of work
As fitted drawings are usually drawn on copies of the
Schematic drawing
Architect’s instructions
Site drawing
Block diagram
A dimension on a diagram measures 25mm, with a scale of 1:50. The real distance is
1.25m
0.5mm
0.5m
1.25mm
Which of these is a statutory document?
IET Guidance note 3
IET Wiring Regulations
Electricity at Work Regulations 1989
IET On Site Guide
What type of lighting circuit is used for controlling lighting in a long corridor?
Junction box method
One way
Intermediate
Two way
What is the purpose of British Standard?
To enable British manufacturers to export their products to Europe
To bring British products up to European standards
To ensure a common minimum standard for products
To ensure only British standard products are used
What cable type is most suitable for transmitting large amount of data?
PVC single core cable
SWA
FP200
Fibre Optic
A disadvantage of a MIMS cable is that
It cannot be installed where the working temperature is high
It is not suitable for fire alarms
It cannot be clipped directly to walls
The cost is high
What colour plug and socket to BS60309 is recognised for use on a 230 volt single phase circuit in an industrial environmental?
Yellow
White
Red
Blue
Which is an incorrect use for flat PVC cable?
Installing a socket for use outdoors
Installing a two way lighting circuit
Connecting a hand held appliance to a plug
Connecting a cooker to a fixed outlet
One disadvantage of installing busbar trunking is that
Appliances connected to a busbar system may require extra fixings for compatibility purposes. As there is no hard wire option
It decreases safety
It decreases flexibility for future modification
It allows for relatively easy re-location of appliances
PVC singles and steel conduit are most suitable for what type of installation?
A garage supply cable buried underground
A rising main in a block of flats
Industrial power and lighting
Domestic house wiring
The primary purpose of the armouring in SWA cable is to
Carry full load current
Carry earth fault current
Provide mechanical protection
Neutralise return path
What wiring system would not be suitable for an agricultural installation?
PVC twin & Earth
PVC single in galvanised conduit
PVC covered MICC cable on galvanised cable tray
SWA
What is an advantage of metal conduit over plastic conduit?
It can be easily formed to shape
It is able to conduct heat
It can be installed without special tools
It may be used as a CPC
What is the best method of fixing a number of small diameter cables to a cable tray?
Cable cleat
Saddle
Cable tie
P Clip
Which lighting system does the diagram show?
Two-way photocell
Two-way plus intermediate
Three position one-way
One-way with PIR
Which overload protective device may be found in an older domestic lighting system?
A
B
C
D
Where will the 16mm² earthing conductor be connected in a domestic TNC-S supply?
Between the consumer unit and steel wire armouring on SWA supply cable
Between the consumer unit and incoming line conductor
Between main gas and water pipes
Between the consumer unit and incoming neutral conductor
What is the maximum floor area for a A3 radial circuit to BS 1363?
50m²
75m²
100m²
150m²
Immersion heaters should be supplied from
A lighting junction box
A 13 amp socket outlet
Their own separate circuit
A switched spur connected from a ring final circuit
What is the standard for fused connection units on ring final circuits?
BS 1362
BS 1363
BS 1361
BS 3036
A polarity test ensures that
The circuit functions correctly
Earthing is satisfactory
All single pole devices are connected to the line conductor
All single pole devices are connected to the neutral conductor
Why is it good practice to connect the highest loading circuit nearest the main switch in a consumer unit?
So that the load is dissipated evenly
High current circuits should be kept away from low current lighting circuits
The consumer units are designed so that circuit breakers can only fit into designated positions
To help prevent the busbar from over heating
Circuits in rooms containing a bath or shower must be protected by
An RCD
A BS 3036 fuse
A type D circuit breaker
A BS 88 fuse
Which device has the features to protect against overloads and can also be used for additional protection.
MCB
Rewireable fuse
RCBO
RCD
What part of the installation is described as an extraneous conductive part?
Washing machine casing
Lightning rod
Metal switch box
Metallic flexible conduit
The earthing arrangement shown is
TN-S
TN-C-S
PME
TT
The protective conductor which connects the main earthing terminal to the means of earthing is called the
Bonding conductor
Circuit protective conductor
Earthing conductor
Supplementary bonding conductor
Which protective device has the disadvantage of having the lowest short circuit capacity?
BS 1361 cartridge fuse
BS-EN 60898 circuit breaker marked M6
General purpose BS 88 fuse
BS 3036 semi enclosed fuse
What part of the installation is described as an exposed conductive part?
Structural steel girder
Main gas pipe
Supply water pipe
Metal conduit
Earthing conductors form part of which electrical safety system?
EMF
CCU
ADS
HSE
What is the minimum size of the main protective bonding conductor in a domestic TN-C-S supply using 25mm² tails
10mm²
25mm²
16mm²
6mm²
The portion of the earth loop impedance path external to the installation has the symbol
Zx
Ze
Zdb
Zs
Which is not part of the earth fault path in a TN-S system?
The earthing conductor
The consumer’s earthing terminal
The neutral connection of the load
The circuit protective conductor
With reference to table F5(II) from the On Site Guide, calculate the volt drop in a 10mm² single phase two core a.c cable 20 metres long, carrying 37A
4.4v
32.56v
0.325v
3.256v
Using table F6 of the onsite guide, what is the current carrying capacity of a 6mm² cable, clipped direct?
27A
47A
64A
34A
Which two correction factors need to be taken into account for multiple circuits run together and each protected by a BS 3036 fuse?
Ca and Cf
Ca and Ci
Cg and Ci
Cf and Cg
What will be the power load of a lighting circuit of 900 watts after applying 66% diversity
59.4W
0.5KW
594W
13.6W
If the maximum volt drop in a consumer installation is exceeded, a solution is to
Increase the length of the circuit
Decrease the cross sectional area of the live conductors
Increase the cross sectional area of the circuit protective conductor
Increase the cross sectional area of the live conductor
Calculate the design current for a 3000W domestic appliance.
16A
15A
12A
13.04A
Using table E2 in the On Site Guide what is the conduit factor for a 25mm² conduit in a short straight run?
460
800 p162 OSG
290
1400
What factor allows the installation of a protective device to be less than the circuit design current when permitted by BS 7671?
Diversity factor
Discrimination
Cable capacity factor
Thermal insulation factor
