Worksheets18th Edition complete mock 2
Total questions: 61
Worksheet time: 2hrs 2mins
Name
Class
Date
1.
Conductors shall be identified in accordance with?
a)
a) Section 512
b)
b) Section 513
c)
c) Section 514
d)
d) Section 515
2.
BS 7671 may need to be supplemented by the requirements or recommendations of which other document when applied to electric surface heating systems?
a)
a) BS EN 60335-2-96
b)
b) BS EN 12954
c)
c) BS EN 13174
d)
d) BS EN 13636
3.
BS 7671 includes requirements for?
a)
a) Electric fences installed on farm-land
b)
b) Wiring systems and cables not specifically covered by the standards for appliances
c)
c) Lift installations in office blocks
d)
d) Wiring systems on military aircraft
4.
BS 7671 is?
a)
a) Non-statutory and cannot be used as evidence to show compliance in a court-of-law
b)
b) Statutory and cannot be used as evidence to show compliance in a court-of-law
c)
c) Non-statutory but can be used as evidence to claim compliance with a statutory requirement in a court-of-law
d)
d) Statutory and can be used as evidence to show compliance in a court-of-law
5.
What is this statement a definition of: 'Protection against electric shock under fault-free conditions?
a)
a) Fault protection
b)
b) Direct contact
c)
c) Indirect contact
d)
d) Basic Protection
6.
Where can further information on Zx be found?
a)
a) Part 2
b)
b) Part 3
c)
c) Appendix 4
d)
d) Appendix 13
7.
EMC regulations are referred to in BS 7671, what does EMC refer to?
a)
a) Electrical Magnetic Compatibility
b)
b) Electronic Magnetic Compatibility
c)
c) Earthed Magnetic Compatibility
d)
d) Electromagnetic Compatibility
8.
To ensure an economic and reliable design, what should be determined?
a)
a) Maximum demand
b)
b) Maximum cable length
c)
c) Earthing arrangement
d)
d) The nature of the current and frequency
9.
Which of the following is an assessment of the compatibility of characteristics, of equipment used?
a)
a) Power factor
b)
b) Maintainability
c)
c) Continuity of service
d)
d) Purpose, supplies and structure
10.
Which of the following is an assessment of general characteristics?
a)
a) The purpose for which the installation is intended to be used
b)
b) The maximum demand required
c)
c) The diversity factor that may be applied
d)
d) The current carrying capacity of the conductors
11.
A general hospital operating theatre needs to ensure the electrical supply will not be cut off during critical operations; and as such an assessment for continuity of service must be conducted; which of the following must be considered?
a)
a) The operating theatre equipment reliability
b)
b) The emergency backup supply system
c)
c) The oxygen supply system feeder-pump
d)
d) Multiple power supplies
12.
The arrangements of current-carrying conductors shall be assessed under which of the following conditions?
a)
a) Primary operating conditions
b)
b) Abnormal operating conditions
c)
c) Normal operating conditions
d)
d) Overload operating conditions
13.
A single-phase reduced low voltage system has been installed with a 25 amp BS 88-2 fuse, what is the maximum allowable value of Zs?
a)
a) 0.81 Q
b)
b) 0.63 Q
c)
c) 0.51 Q
d)
d) 0.52 Q
14.
Chapter 43 of BS 7671 provided protection against?
a)
a) Undercurrent
b)
b) Overcurrent
c)
c) Undervoltage
d)
d) Overcurrent
15.
The method of protection by use of non-conducting locations is?
a)
a) Usually reserved for travelling fairgrounds and circuses
b)
b) Regularly used throughout commercial installation
c)
c) Used wherever water is present such as marinas
d)
d) Not recognised for general application
16.
When selecting a device for overload protection, the device must be co-ordinated with the conductor to ensure?
a)
a) The continuous service current of the cable is 1.45 times higher than the current causing the overload
b)
b) The design current of the circuit is less than the rated current of the protective device
c)
c) The rated current of the protective device exceeds the lowest rated capacity of any cable
d)
d) The current l2 causing effective operation of the protective device does not
17.
Which of these is not an example of an extraneous-conductive part?
a)
a) Metal trunking enclosing cables
b)
b) Central heating radiator
c)
c) Exposed metallic structural part of a building
d)
d) Water pipe feeding a gas boiler
18.
Where the transfer of supply to an alternative supply is to take place in a TN system, a multi-pole switch must be used which switches the line and neutral conductors, this method prevents?
a)
a) Electromagnetic fields due to stray currents in the main supply system
b)
b) The earth-fault loop impedance exceeding maximum values
c)
c) The prospective fault current tripping the main protective circuit breaker
d)
d) The rated residual current tripping any RCD devices
19.
Simultaneously accessible exposed-conductive parts shall be connected to the same earthing system?
a)
a) Independent of each system
b)
b) Individually, in groups or collectively
c)
c) Not at all
d)
d) Through a high resistance impedance
20.
What is the minimum impulse voltage for 120 V Category II equipment?
a)
a) 1.5 kV
b)
b) 2.5 kV
c)
c) 4.0 kV
d)
d) 6.0kV
21.
The external influence code CA2 refers to?
a)
a) Where a building is subject to ground tremors
b)
b) Where a building is mainly constructed of combustible material e.g. wood
c)
c) Where a building is subjected to heavy water waves
d)
d) Where a building is subjected to extreme ultra-violet radiation
22.
In an IT system that does not have a neutral conductor it is permitted to omit a device to provide overload protection if?
a)
a) The DNO supply fuse will provide this protection
b)
b) The IT earth-impedance is sufficiently high enough
c)
c) Harmonic currents will not be present
d)
d) An RCD is installed in each circuit
23.
A BS 88-2 fuse is to be fitted to a TN circuit with a Zs value of 2.4 Q and requiring a disconnection time of 0.4s What is the maximum rated fuse that couId be used?
a)
a) 25 A
b)
b) 32 A
c)
c) 16 A
d)
d) 20 A
24.
A temperature cut-out device shall have only?
a)
a) A manual reset
b)
b) An automatic reset
c)
c) A re-settable reset
d)
d) A master reset
25.
New to the 18th edition wiring regulation is a requirement with regards to luminaires in domestic premises which requires additional protection to final circuits by means of?
a)
a) Ceiling roses to BS:67 which must be SELV
b)
b) Conduit for cables to prevent nails and screws damaging cables
c)
c) 30 mA RCDs
d)
d) 100 mA RCDs
26.
A veterinary surgery uses an IT system with an a.c. supply. If RA is the sum of the resistances of the earth electrode and the protective conductor connecting it to the exposed conductive-parts (in ohms) and Id is the rated residual operating current, then RA x Id must not exceed?
a)
a) 25 V
b)
b) 50 V
c)
c) 110 V
d)
d) 120 V
27.
In locations where BE2 conditions exist, and where cables are bunched or installed in long vertical runs, the risk to the cables is?
a)
a) From sagging due to the weight of the cables
b)
b) From flame propagation
c)
c) From large overcurrent
d)
d) From short circuits
28.
Where identification of individual conductors is made by use of numerals, what colour ratio is permitted for the identification?
a)
a) Yellow on Brown
b)
b) Black on Brown
c)
c) Red on Black
d)
d) Black on White
29.
A generating set is to run in parallel with the public supply system, which of the following factors need NOT be taken into consideration?
a)
a) Power factor
b)
b) Voltage changes
c)
c) Earth fault loop impedance
d)
d) Harmonic distortion
30.
Where water may collect or condensation may form in a wiring system, provision shall be made for?
a)
a) Ventilation
b)
b) Effects of corrosion
c)
c) Its escape
d)
d) Short circuits
31.
What information needs to be shown on an Electrical Installation Condition Report notification label?
a)
a) Name of tester
b)
b) Results of inspection
c)
c) Installation details
d)
d) Date of last inspection
32.
A circuit is installed with 10 mm2 70°C thermoplastic multicore cable which has a protective conductor made of copper. The maximum fault current that can occur in the circuit is 600 amps, which will disconnect the circuit in 0.1 seconds, what is the minimum acceptable cross-sectional area of the cpc?
a)
a) 1.0 mm2
b)
b) 1.5 mm2
c)
c) 2.5 mm2
d)
d) 4.0 mm2
33.
What is the minimum allowable size of copper cable used for a main protective bonding conductor?
a)
a) 6 mm2
b)
b) 35 mm2
c)
c) 25 mm2
d)
d) 1 mm2
34.
Where a private source for a safety service can operate in parallel with the public supply systems, permission to operate the source must be obtained from?
a)
a) The installation designer
b)
b) The duty-holder
c)
c) The distribution network operator (DNO)
d)
d) The heaIth and safety executive
35.
Three circuits can share the same ducting system, provided?
a)
a) Every cable is insulated to the highest voltage present
b)
b) Only plastic ducting is used
c)
c) The ducting has partitions
d)
d) The cables are separated by 500 mm
36.
An installation includes a d.c. power circuit with a grey coloured cable, which terminal does this cable connect to?
a)
a) Positive
b)
b) Earth
c)
c) Negative
d)
d) Mid-wire
37.
A powertrack system shall be installed in accordance with the manufactures instructions, taking into account?
a)
a) The number of bunched circuits
b)
b) The maximum prospective fault current of the conductors
c)
c) The external influences
d)
d) The maximum temperature rating of the track
38.
An RCD is to be used to provide protection against electric shock, the RCD shall be capable of disconnecting?
a)
a) The neutral conductor
b)
b) The live conductors
c)
c) The line conductors
d)
d) The cpc
39.
It can be considered that the neutral conductor may carry a significant electric current in a three-phase system when a third harmonic current is present with a harmonic distortion greater than?
a)
a) 1°/o
b)
b) 5°/o
c)
c) 10°/o
d)
d) 15°/o
40.
What is the minimum cross-sectional area of an unscreened multi-core copper conductor used for data transfer?
a)
a) 0.1 mm2
b)
b) 0.2 mm2
c)
c) 0.4 mm2
d)
d) 0.5 mm2
41.
Firefighter's switches are red, as they are used for isolating an installation to remove any unexpected danger. Where does it state they should be red?
a)
a) 511.2
b)
b) 560.9
c)
c) 537.3.3.5
d)
d) 541.3
42.
When a ceiling rose is fitted in a lighting circuit it shall comply with?
a)
a) BS 67
b)
b) BS 6972
c)
c) BS EN 60598
d)
d) BS EN 60309-2
43.
Who shall make an initial verification of a new installation?
a)
a) The designer
b)
b) The person ordering the work
c)
c) The architect
d)
d) A skilled person
44.
If all of the following tests are required in a new electrical installation, which of the listed tests must be performed first before the installation is energised?
a)
a) Protection by SELV
b)
b) Earth electrode resistance
c)
c) Insulation resistance
d)
d) Polarity
45.
With regards to initial verification and testing, the verification process shall include comparison of the results with the relevant criteria to confirm that the requirements of the regulations?
a)
a) Are the same as the previous test resuIts
b)
b) Are no worse than the previous test results
c)
c) Have been met
d)
d) Have been recorded in the schedule or works results
46.
An insulation test on a PELV circuit must have a minimum IR value of?
a)
a) 0.5 mQ
b)
b) 0.5 MQ
c)
c) 1.0 MQ
d)
d) 1.5 MQ
47.
With regards to solar photovoltaic power supply systems, when the system is disconnected from the AC supply the DC side should be considered to be?
a)
a) Isolated fram the system
b)
b) In standby mode
c)
c) Energised
d)
d) A high impedance circuit
48.
With regards to electric vehicle charging circuits supplied by a TN system, final circuits supplying a charging point for electric vehicles shall not include?
a)
a) A PEN conductor
b)
b) An RCD
c)
c) Any earthing on the DC side
d)
d) A low impedance circuit
49.
Protective bonding conductors for use on agricultural land shall be protected against mechanical damage, corrosion and electrolytic effects. Which of the following would not be a suitable means for providing such protection?
a)
a) Hot-dip galvanized strip-steel
b)
b) Hot-dip galvanized round-steel
c)
c) Uncoated steel mesh
d)
d) Copper conductors having a minimum c.s.a of 4 mm2
50.
For electrical installations in Caravans and Motor Caravans, the nominal d.c. supply voltage shall not exceed?
a)
a) 12 volts
b)
b) 18 volts
c)
c) 24 volts
d)
d) 48 volts
51.
On a marina what is the minimum height above the highest water level that a socket-outlet may be placed (excluding floating pontoons)?
a)
a) 0.5 m
b)
b) 1.0 m
c)
c) 1.5 m
d)
d) 2.0 m
52.
For a PV installation, where should a switch-disconnector be situated?
a)
a) On the a.c. side at the PV convertor
b)
b) On the d.c. side at the PV convertor
c)
c) At the fuse-board
d)
d) Not needed
53.
Water pumps installed inside the basin of a fountain are only permitted if?
a)
a) The supply is by SELV at a nominal voltage not exceeding 25 volts a.c
b)
b) The supply is from a safety service source
c)
c) The supply is located outsize zone 0
d)
d) The supply is by SELV at a nominal voltage not exceeding 12 volts a.c
54.
On a caravan or camping park underground cables shall be buried at a depth of at least?
a)
a) 0.4 m
b)
b) 0.5 m
c)
c) 0.6 m
d)
d) 0.7 m
55.
What is the recommended minimum level of protection for equipment within a Sauna where water jets used for cleaning may be expected?
a)
a) IPXXB
b)
b) IP2X
c)
c) IPX5
d)
d) IPX4
56.
In medical locations of group 1 and group 2, the voltage presented between simultaneously accessible exposed conductive parts and extraneous-conductive parts sha11 not exceed?
a)
a) 12 volts a.c.
b)
b) 12 volts d.c.
c)
c) 30 volts a.c.
d)
d) 60 volts d.c.
57.
When measuring the prospective fault current in a three-phase installation the highest prospective fault current will occur?
a)
a) When a short circuit develops between a line and neutral conductor
b)
b) When a short circuit develops between a line and earth conductor
c)
c) When a short circuit develops between two-line conductors
d)
d) When a short circuit develops simultaneously between all line conductors
58.
With reference to AC motors used within an energy efficiency system, what method can be used to achieve higher energy efficiency?
a)
a) Install less powerful motors
b)
b) Install more powerful motors
c)
c) Install variable speed drives
d)
d) Install fixed speed drives
59.
With reference to energy efficiency system, to obtain a load profile, measurement of energy used should be recorded over a minimum period of?
a)
a) 1 hour
b)
b) 5 hours
c)
c) 12 hours
d)
d) 24 hours
60.
With reference to energy efficiency systems, consideration should be given to improving load power factor to?
a)
a) Reduce tariff penalties
b)
b) Reduce the harmonic distortion in the system
c)
c) Reduce the maintenance required
d)
d) Reduce the impulse withstand voltage
61.
A 70°C thermoplastic cable is ran in free air through a bakery with an expected ambient temperature of 40°C. What cable-rating factor should be applied to the current carrying capacity?
a)
a) 1.00
b)
b) 0.94
c)
c) 0.87
d)
d) 0.79
100 %
