Electrotechnical

Question 1

In accordance with the Electricity at Work
regulations, when considering whether to work live a
responsible person should:

A - Carry out a risk assessment
B - Only work dead
C - Only work live
D - Do as the client demands

Answer 1

A - Carry out a risk assessment

Question 2

The normal procedure for working on electrical
equipment should be which one of the following?

A - Dead working
B - Wearing insulated gloves
C - Using insulated tools
D - Live working

Answer 2

A - Dead working

Question 3

Test instruments used for working on electrical
systems should:

A - Be yellow in colour
B - Be less than 10 years old
C - Have non-insulated test probes
D - Have insulated test probes

Answer 3

D - Have insulated test probes

Question 4

Under the Electricity at Work Regulations, live
working is considered:

A - As entirely acceptable
B - To be normally permitted
C - Only to be allowed in exceptional
circumstances
D - Never to be allowed

Answer 4

C - Only be allowed in exceptional circumstances

Question 5

Which of the following would you use to replace the
fuse in a plug if fuses were NOT available?

A - A nail
B - A piece of silver paper
C - A bit of wire
D - None of the options listed

Answer 5

D - None of the options listed

Question 6

To prove a circuit or equipment is dead after isolation
what is the FIRST activity in the sequence of events?

A - Make sure equipment is not working
B - Check between line and earth
C - Check that the voltage detector is working on
a proving device, known live source or inbuilt test feature
D - Check between line and neutral

Answer 6

C - Check that the voltage detector is working on a proving device, known live source or inbuilt test feature

Question 7

The nominal single phase voltage in the UK is?

A - 230 volts
B - 240 volts
C - 415 volts
D - 400 volts

Answer 7

A - 230 volts

Question 8

When is live working permissible?

A - When the person carrying out the work is a
competent person
B - When it is unreasonable in all circumstances
for the equipment to be made dead and
suitable precautions are taken
C - When the means of isolation cannot be
identified
D - When the person working on the equipment
is wearing rubber gloves

Answer 8

B - When it is unreasonable in all circumstances for the equipment to be made dead and suitable precautions are taken

Question 9

Which of the following is not a requirement of low
voltage safe isolation practice?

A - Ensuring that the correct point of isolation is
identified
B - The person carrying out the work is issued
with insulating gloves
C - A caution notice should be applied at the
point of isolation
D - The conductors are proved to be dead at the
point of work

Answer 9

B - The person carrying out the work is issued with insulating gloves

Question 10

The specific effects on the human body of a major
electric shock are one of the following:

A - Dermatitis
B - Burns and cardiac arrest
C - Broken bones
D - Chest pains

Answer 10

B - Burns and cardiac arrest

Question 11

The lowest level of electrical current which can harm
the human body is normally measured in:

A - Microamps
B - Kiloamps
C - Amps
D - Milliamps

Answer 11

D - Milliamps

Question 12

With regard to the effect of electrical current on the
human body, one of the following is correct:

A - a 6 amp circuit breaker should prevent a
person receiving a fatal electric shock
B - a 3 amp fuse should prevent a person
receiving a fatal electric shock
C - a 30mA Residual Current Device (RCD)
should prevent a person receiving a fatal
electric shock.
D - a 5 amp rewireable fuse should prevent a
person receiving a fatal electric shock

Answer 12

C - a 30mA Residual Current Device (RCD) should prevent a person receiving a fatal electric shock

Question 13

Where mains voltage is used to supply portable
equipment on a construction site, what additional
protection is required?

A - Step-down transformer
B - Step-down generator
C - Cable avoidance tool
D - Residual Current Device (RCD)

Answer 13

D - Residual Current Device (RCD)

Question 14

What colour cable USUALLY signifies 110 volt power
supply on site?

A - Black
B - Red
C - Blue
D - Yellow

Answer 14

D - Yellow

Question 15

A portable electric generator on site has two power
outlets, 110 volts and 230 volts. What colour would
the 110 volt outlet be?

A - Black
B - Yellow
C - Red
D - Blue

Answer 15

B - Yellow

Question 16

Where there is no local means of isolation for
equipment or circuits to be worked on, which of the
following is the preferred method of isolation?

A - Isolation of the main switch or DB switch-disconnector
B - Isolation of the individual circuit breaker or
fuse
C - Pulling out the distributor’s cut-out fuse
D - Disconnecting the individual circuit from the
DB

Answer 16

A - Isolation of the main switch or DB switch-disconnector

Question 17

What action should you take if a workmate gets an
electric shock?

A - Phone the electricity board immediately
B - Dial 999 and ask for the fire brigade
C - Cut off the power and call for help
D - Try to pull them to safety

Answer 17

C - Cut off the power and call for help

Question 18

A residual current device is designed to operate in
the event of one of the following:

A - Overload
B - Earth fault
C - Lightning strike on the supply
D - Short-circuit

Answer 18

B - Earth fault

Question 19

Electrical installations on construction sites should be
periodically inspected and tested:

A - Every 3 months
B - Every year
C - Every 6 months
D - Every month

Answer 19

A - Every 3 months

Question 20

The maximum AC voltage which the human body
can withstand without long term physiological
effects in dry conditions is:

A - 110 volts
B - 230 volts
C - 50 volts
D - 400 volts

Answer 20

C - 50 volts

Question 21

Which of the following statements is true with
regard to the dangers of electricity?

A - Electricity is perfectly safe so long as you
wear cotton gloves
B - Electricity is only dangerous if you are not
wearing wellington boots
C - Electricity is only dangerous in wet weather
D - Electricity is dangerous at any time because
you cannot tell by looking at a cable whether
or not it is live

Answer 21

D - Electricity is dangerous at any time because you cannot tell by looking at a cable whether or not it is live

Question 22

What is the most serious effect that electric shock
can have if you come into contact with a live part?

A - The electric current can cause a slight
tingling in the fingers
B - The electric current can cause burn marks on
the fingers
C - The electric current can cause the heart to
stop, resulting in death
D - The electric current can cause the finger
muscles to twitch

Answer 22

C - The electric current can cause the heart to stop, resulting in death

Question 23

Your job involves you working near to hanging
electrical cables which have bare ends. What should
you do?

A - Touch the cables to see if they are live
B - Carry on working, as there shouldn’t be a
problem
C - Inform your supervisor and keep well away
D - Attempt to push the cables back into the
ceiling void so that you can start work

Answer 23

C - Inform your supervisor and keep well away

Question 24

For all live working activities it is necessary to:

A - Carry out a risk assessment as required by
the EAW Regulations.
B - Wear rubber gloves only
C - Be accompanied
D - Keep your fingers crossed

Answer 24

A - Carry out a risk assessment as required by the EAW Regulations.

Question 25

An electrical Permit to Work is primarily a statement that: A - Someone else has taken responsibility for the work B - The circuit or equipment is live C - Certain instructions need to be followed D - The circuit or equipment has been isolated and is safe to work on

Answer 25

D - The circuit or equipment has been isolated and is safe to work on

Question 26

The probes of voltage detectors and test instruments used on electrical systems should be: A - Manufactured in the UK B - Accompanied by a calibration certificate C - Shaped or have barriers to prevent finger contact with the tips D - Coloured red

Answer 26

C - shaped or have barriers to prevent finger contact with the tips

Question 27

Which of the following does the Electricity at Work (EAW) regulations apply to? A - All persons engaged for work purposes B - Self employed persons only C - Employees only D - Employers only

Answer 27

A - All persons engaged for work purposes

Question 28

The Electricity at Work Regulations require that: A - Persons working with electricity must have the appropriate level of knowledge and experience B - A training course is necessary before anyone can work with electricity C - Only electricians can work with electricity D - Anyone supervised can work with electricity

Answer 28

A - Persons working with electricity must have the appropriate level of knowledge and experience

Question 29

The Electricity at Work Regulations apply to: A - Only low voltage systems B - Only extra-low voltage systems C - All voltage systems D - Only high voltage systems

Answer 29

C - All voltage systems

Question 30

Which of the following should be used to prove a circuit or equipment is dead after isolation? A - A lamp holder with a length of flex attached B - A proprietary test lamp or two-pole voltage detector C - A voltage stick D - A multimeter

Answer 30

B - A propriety test lamp or two-pole voltage detector

Question 31

Which of the following is not a suitable means of isolating a circuit? A - Removing a fuse and locking the distribution board B - Putting insulating tape over the circuit breaker C - Padlocking the isolating switch D - Fitting a padlocked circuit breaker lockout

Answer 31

B - Putting insulation tape over the circuit

Question 32

Which of the following work procedures on electrical systems will always require a permit-to-work to be issued? A - Dead working on low-voltage systems B - Live working on low-voltage systems C - Dead working on high-voltage systems D - Live working on high-voltage systems

Answer 32

C - Dead working on high-voltage systems

Question 33

Optical fibre cable remnants should not be left lying around on site because: A - They can be hot and burn upon contact B - Laser beams still exist in the cut pieces C - They can pierce the skin or eyes D - They are toxic

Answer 33

C - They can pierce the skin or eye

Question 34

Why should the end of an optical fibre cable never be pointed towards your own or anyone else’s eyes? A - The beam can transfer a strong electric current B - The colour of the beam is very hypnotic C - The beam can bore a hole through the skin D - The beam can damage the eyes

Answer 34

D - The beam can damage the eyes

Question 35

The use of a multi-lock hasp with the appropriate number of padlocks is a recommended method of safe isolation where: A - Individual circuit breaker locking off devices are not available B - Individual circuit breakers are not identified at the distribution board C - More than one person will be working on circuits supplied from the same distribution board D - You know the health and safety inspector is in the area

Answer 35

C - More than one person will be working on circuits supplied from the same distribution board

Question 36

Which of the following procedures should be used when more than one person will be working on circuits supplied from a distribution board which has been switched off? A - The use of a multi-lock hasp on the isolator with a padlock for each operative B - Blowing a horn before the power is switched on again C - Giving each operative a volt stick D - Telling everyone what time the power will be switched on again

Answer 36

A - Use a multi-lock hasp on the isolator with a padlock for each operative