Worksheets18th edition complete mock 5
Total questions: 60
Worksheet time: 2hrs 0mins
Name
Class
Date
1.
Which standard, for the selection of electrical equipment, cannot be used?
a)
a) To BS EN
b)
b) To IEC
c)
c) To BS
d)
d) To your own standard
2.
What characteristic of the supply is not required to be included in documentation that should accompany an electrical installation certificate in commercial premises?
a)
a) The circuits insulation resistance value
b)
b) The nominal frequency
c)
c) The prospective short-circuit current
d)
d) The nominal voltage
3.
In electrical installations, where the protection of safety is paramount the risk of injury may result from?
a)
a) Ignition of a potentially explosive atmosphere
b)
b) The apprentice leaving live wires exposed
c)
c) The incorrect equipment being used
d)
d) Non-skilled persons working on electrical equipment
4.
BS 7671 is NOT intended to provide safety from electric shock, which may result from?
a)
a) Interruptions of supply in an operating theatre
b)
b) Unauthorized access to railway signaling equipment
c)
c) Interruptions of electrical supply at a travelling fair
d)
d) Shock currents on a marina
5.
Band II voltages do not exceed
a)
a) 2500 v de
b)
b) 1700 v de
c)
c) 1000 v ac r.m.s
d)
d) 1600 v ac r.m.s
6.
What is the correct name for a protective conductor that provides equipotential bonding?
a)
a) Bonding conductor
b)
b) Earth conductor
c)
c) Earthing conductor
d)
d) Supplementary equipotential bonding conductor
7.
Installations are divide into circuits for a given reason, which option below is not a Iisted reason?
a)
a) Safe Inspection
b)
b) Testing
c)
c) Maintenance
d)
d) To reduce the current in multiple cables
8.
Which of the following options is not a check for compatibility of characteristics of equipment used?
a)
a) High frequency oscillations
b)
b) Maintainability of equipment
c)
c) Transient overvoltage
d)
d) Harmonic currents
9.
The number or final circuit required, and the number of points supplied by any final circuit shall be such as to facilitate compliance with the requirements of Chapter 43 as regards?
a)
a) Current-carrying capacity of conductors
b)
b) Isolation
c)
c) Overcurrent protection
d)
d) Switching
10.
Which of the following is an assessment of general characteristics?
a)
a) The external influences to which it is to be exposed
b)
b) The internal electro-magnetic compatibility
c)
c) The rating of the main cut-out fuse
d)
d) The earthing arrangements
11.
Where the provision of supplies for safety services is required, what conditions may be considered?
a)
a) The maintainability of the installation
b)
b) The reliability of the equipment
c)
c) The effectiveness of protective measures
d)
d) Emergency evacuation of the premises
12.
What may be taken into account when determining the maximum demand of an installation?
a)
a) Earthing arrangements
b)
b) Maximum cable length
c)
c) Diversity
d)
d) The nature of the current and frequency
13.
In locations where BE2 conditions exist, measures shall be taken to prevent enclosures of electrical equipment such as a heater under normal operating conditions from exceeding?
a)
a) 60 °c
b)
b) 70 °c
c)
c) 80 °c
d)
d) 90 °c
14.
Within a domestic premise's switchgear, similar equipment, and consumer units shall be protected against fire caused by electrical equipment by?
a)
a) Being constructed from insulation material
b)
b) Being constructed from non-combustible material
c)
c) Being constructed from heavy gauge plastic
d)
d) Being constructed from industrial grade polypropylene
15.
In each part of an installation, at least one protective measure must be used? Which of these is not a recognised protective general requirement?
a)
a) PELV
b)
b) SELV
c)
c) FELV
d)
d) ADS (Automatic Disconnection of Supply)
16.
Where protection against overload is being considered in chapter 43, disconnection does not necessarily mean?
a)
a) Through the use of a socket outlet
b)
b) By means of an RCD
c)
c) Isolation
d)
d) By manual disconnection
17.
In an electrical substation supplying a TN system, the power frequency stress voltages, with RE and Rs separated, the value of U1 is equal to?
a)
a) Uo
b)
b) RE.IE + Uo
c)
c) RA x Id
d)
d) RA+ Uox/3
18.
A circuit protective conductor shall be run to and terminated at each point in the wiring system and at each accessory except?
a)
a) A suspended lamp-holder having no exposed conductive parts
b)
b) A socket-outlet serving a SELV circuit
c)
c) A socket-outlet serving an RCD controlled appliance
d)
d) A luminaire installed outside a building
19.
In an a.c. system additional protection by means of a 30 mA RCD shall be provided for socket-outlets providing the maximum rated current of the outlets does not exceed?
a)
a) 16 amps
b)
b) 20 amps
c)
c) 30 amps
d)
d) 32 amps
20.
A commercial fish-breeder has decided to install a reduced low voltage circuit to supply an outdoor pond where the fish stock is kept. What type of source is the installing electrician permitted to install?
a)
a) An engine driven generator independent of the public supply
b)
b) An engine driven generator connected to the public supply
c)
c) A source provided by an IT system
d)
d) A source provided by a TN-C system
21.
A circuit in an installation has been extended; at the junction box, the cable reduces from 4 mm2 to 2.5 mm2• Which of these conditions would not require a protective device to provide protection against fault current for the extended circuit?
a)
a) The cable is for a control cable for a generator
b)
b) Where disconnection could cause a dangerous condition
c)
c) The circuit supplies a measuring device
d)
d) The extension cable is 2.5 m long
22.
What is the minimum impulse withstand voltage for category IV equipment for use in an installation with nominal voltage of 277/480?
a)
a) 1.0 kV
b)
b) 2.0 kV
c)
c) 6.0 kV
d)
d) 8.0 kV
23.
What is absolute the maximum tabulated value of earth fault loop impedance Zsfor a 230 V 32A distribution circuit protected by a BS 88-2 Type E device?
a)
a) 0.99 Q
b)
b) 1.69 Q
c)
c) 1.70 Q
d)
d) 1.44Q
24.
An obstacle in an electrical installation may be removed?
a)
a) By any person
b)
b) Only by skilled persons
c)
c) Only with the use of a tool or key
d)
d) Without the use of a tool or key but it shall be secured to prevent unintended removal
25.
Where CA2 conditions exist; in prefabricated hollow walls containing a pre installed wiring system including accessories, all boxes and enclosures shall have a degree of protection of at least?
a)
a) IPlX
b)
b) IP2X
c)
c) IP3X
d)
d) IP4X
26.
In a TN-C-S system a PEN conductor shall not be used on the load side when?
a)
a) Unearthed ceiling roses to BS:67 are fitted
b)
b) Cables are installed less than 50 mm from plaster board walls
c)
c) RCDs are fitted
d)
d) The earth fault loop impedance is rather high
27.
A new circuit requires protection against overload current this shall be coordinated with protection against fault current in accordance with section? a)
a)
a) 433
b)
b) 434
c)
c) 435
d)
d) 436
28.
Which device is NOT suitable for disconnection whilst carrying current?
a)
a) Switching device to BS EN 60669-2-1
b)
b) Switching device to BS EN 60947-3
c)
c) Contactor to BS EN 60947-4-1
d)
d) Circuit breaker to BS EN 60898
29.
Where 'high reliability' is required in a circuit, the use of which of the following shouId be considered?
a)
a) Use of safety circuits
b)
b) Use of IT systems
c)
c) Use of unearthed auxiliary circuits
d)
d) Use of non RCD TN circuits
30.
In an electrical circuit when connections are made which of the following types of connection must be available for inspection, testing and maintenance?
a)
a) A connection between a cold tail and the heating element
b)
b) A joint made by welding
c)
c) A compound filled joint
d)
d) A connection in an enclosure at a height of 1m above ground level
31.
When lighting is used in a location where rotating or rapidly moving machine parts are present consideration needs to be given to stroboscopic effects because?
a)
a) The effects can cause harmonics in the supply cables
b)
b) The effects can introduce a neutral current in the supply cables
c)
c) The effects increase the load on the circuit
d)
d) The effects cause moving parts to appear stationary
32.
Acceptable protective conductors of cross-sectional area 10 mm2 or less shall be made of?
a)
a) Copper
b)
b) Aluminium
c)
c) Bare steel
d)
d) Coated steel
33.
The minimum dimensions for the height of the 'ON' and 'OFF' lettering on a firefighter's switch shall be not less than?
a)
a) 5 mm
b)
b) 10 mm
c)
c) 15 mm
d)
d) 20 mm
34.
Band I and Band II circuits are not normally permitted to be installed in the same wiring system, when this does occur and also when a multicore cable is used, the cores of the Band I and II circuits must be separated by?
a)
a) A cable conduit system with separate compartments
b)
b) An earthed trunking system with separate compartments
c)
c) A plastic trunking system with metal screened compartments
d)
d) An earthed metal screen of equivalent current-carrying capacity to that of the largest core of the Band II circuit
35.
Where it is desired NOT to calculate the sizing of a cpc, we can use the alternative method to Regulation 543.1.3 for sizing a cpc. What is the minimum size cpc to be used when a copper line conductor has a cross-sectional area (c.s.a) of 95 mm2 and it is area ( c.s.a) of 150 mm2 and it is desired to have the cpc also made from copper?
a)
a) 35 mm2
b)
b) 50 mm2
c)
c) 70 mm2
d)
d) 95 mm2
36.
When a bus-bar trunking system is installed in a circuit it must comply with?
a)
a) BS EN 1648
b)
b) BS EN 12954
c)
c) BS EN 50086
d)
d) BS EN 61439-6
37.
A wiring system is installed in an area where the presence of corrosive substances are present, what is a suitable method of providing additional protection to the wiring system?
a)
a) Enclose the wiring system in copper tape
b)
b) Enclose the wiring system in plastic tape
c)
c) Enclose the wiring system in aluminium tape
d)
d) Enclose the wiring system in protective tape
38.
Part of your electrical training taught you that whenever you have an interface between conductors you must clearly identify them, such as when making off the line switch return wire for a lighting circuit; but which regulation in BS 7671 states you must do this?
a)
a) 510.3
b)
b) 512.1.4
c)
c) 512.2.4
d)
d) 514.1.3
39.
What is the maximum recommended distance of the location of the main equipotential bonding connection on a mains gas pipe from the meter outlet?
a)
a) 300 mm
b)
b) 400 mm
c)
c) 500 mm
d)
d) 600 mm
40.
Where can further information on bindings and sleeves for identification purposes be found?
a)
a) BS 3858
b)
b) BS 3859
c)
c) BS EN 559
d)
d) BS EN 60617
41.
Which one of the following is not considered in BS 7671 for low voltage and extra low voltage installations which incorporate a generating set?
a)
a) Mains excited synchronous generators
b)
b) Separately excited synchronous generators
c)
c) Self excited asynchronous generators
d)
d) Self excited synchronous generators
42.
Any insulation arrangement of extraneous-conductive parts intended to satisfy 418.1.4 (iii) shall be able to withstand a test voltage of at least?
a)
a) 1 kV a.c.
b)
b) 2 kV a.c.
c)
c) 3 kV a.c.
d)
d) 4 kV a.c.
43.
An electrical installation certificate shall include?
a)
a) A section with essential tests
b)
b) The reasons for producing the report
c)
c) The limitations of inspection and testing
d)
d) Details of the extent of the work covered by the certificate
44.
An initial verification of a new electrical installation, needs to be performed, which of the following does not need to be verified?
a)
a) Selection of conductors for current-carrying capacity
b)
b) Connection of single-pole devices for protection in line conductor only
c)
c) Correct connection of accessories and equipment
d)
d) The circuits insulation resistance
45.
Where it is not possible to remove an SPD whilst conducting an insulation resistance test on a 230-volt circuit, the test voltage may be reduced to?
a)
a) 300 volts d.c
b)
b) 250 volts d.c
c)
c) 25 volts d.c
d)
d) 25 volts a.c
46.
In medical location supplied by an IT system socket outlets supplying medical equipment shall be?
a)
a) Double-pole switched sockets
b)
b) Single-pole switched sockets
c)
c) Unswitched
d)
d) Single-socket outlets only
47.
In a hotel swimming pool, zone 1 is considered to be a vertical plane?
a)
1 m from the rim of the basin
b)
2 m from the rim of the basin
c)
3 m from the rim of the basin
d)
4 m from the rim of the basin
48.
Section 714 does not apply to outdoor lighting installations such as?
a)
a) Road signs
b)
b) Carparks
c)
c) Sporting areas
d)
d) Road traffic signal systems
49.
Which of the following is the correct description for Zone 2 where a shower has no basin (wet shower)?
a)
a) Up to 2.25 m above finished floor level
b)
b) 0.6 m horizontally from zone 1
c)
c) Under the shower floor
d)
d) No Zone 2
50.
In a motor caravan, except for a shaver socket-outlet, which of the following methods of protection against electric shock are permitted?
a)
a) Electrical separation
b)
b) Obstacles
c)
c) Earth-free local equipotential bonding
d)
d) ADS
51.
Where a sauna heater is positioned within 0.5 m of the cabin wall; if a device is to be installed 1 m horizontally from a sauna heater and within 1.0 m from floor level what zone would it be in?
a)
a) Outside the zones
b)
b) Zone 1
c)
c) Zone 2
d)
d) Zone 3
52.
In a fixed onshore installation why should the protective conductor of the supply to an isolating transformer not be connected to the earth terminal in a socket-outlet supplying an inland navigation vessel?
a)
a) To prevent galvanic action
b)
b) The question is a red-herring, all socket-outlets must have a protective conductor
c)
c) To provide protection against electric shock
d)
d) Its prohibited by the Electricity Safety, Quality and Continuity Regulations (ESQCR)
53.
Which of the following is considered to be in a Group 1 medical location?
a)
a) Physiotherapy room
b)
b) Anaesthetic room
c)
c) Operating theatre
d)
d) Intensive care room
54.
Socket-outlets supplying electrical equipment to be used in the basin of a public swimming pool shall?
a)
a) Not be permitted
b)
b) Not be used when the people are in the pool
c)
c) Be installed at a height of 3 metres above floor level
d)
d) Only be operated with the use of a tool or key
55.
An electrical contractor is asked to install a new ring final circuit in the horticultural section of a garden centre, the socket-outlets will not exceed 32 amps, and an RCD is to be used to provide ADS for protection against electric shock'. What is the maximum permitted rating for this RCD?
a)
a) 20 mA
b)
b) 30 mA
c)
c) 100 mA
d)
d) 500 mA
56.
What is the current required to operate a 6A BS EN 60898 Type C MCB between 0.1 and 5 seconds?
a)
a) 6 A
b)
b) 30 A
c)
c) 60 A
d)
d) 120 A
57.
When considering the installation method of a cable installed under a ceiling for current rating purposes, the installation reference method must be?
a)
a) Reference method A
b)
b) Reference method B
c)
c) Reference method C
d)
d) Reference method D
58.
What is the rating factor for cables enclosed in infloor concrete troughs for a group of six single-core 6 mm2 copper conductors, arranged in a flat group, if the infloor trough measures 450 mm wide by 600 mm deep with a 100 mm cover?
a)
a) 0.92
b)
b) 0.89
c)
c) 0.86
d)
d) 0.81
59.
With reference to AC motors used within an energy efficiency system, what does the code IE2 refer to?
a)
a) Low efficiency
b)
b) Good efficiency
c)
c) High efficiency
d)
d) Super high efficiency
60.
When measuring the resistance / impedance of floors and walls approximately what force should to be applied to the electrode measuring the floor value?
a)
a) 550 N
b)
b) 650 N
c)
c) 750 N
d)
d) 850 N
100 %
