Electrical Installation #1

1. Where would you go if your fire alarm was activated?

The manager's office

The fire assembly point

Go to your car and wait

Clock out and go home immediately

2. What is the unit of Electro-Motive Force (EMF)?

Volts

Amps

Ohms

3. The frequency of the mains supply in the UK is:

50Hz

60Hz

70Hz

40Hz

4. What is the cause of most accidents?

Poisoning

Slips, trips and falls

Electrocution

Suffocation

5. What is the usual single phase voltage supply to a domestic installation?

430V

110V

230V

360V

6. FELV stands for:

Functional extra-low voltage

Fixed extra-low voltage

Flourescent extra-low voltage

Freestyle extra-low voltage

7. In relation to Health and Safety an employer must provide all of the following except for:

Safety training

Information to staff involving safety risks

Safe areas for access and exit routes to and from a site

A copy of BS7671

8. This unit measures 'charge'

Volt

Ampere

Coulomb

Ohm

9. When measuring for Resistance, you should always:

Ensure testing probes are connected in series with load

Ensure supply is off

Ensure supply has been running for at least 2 minutes

Ensure testing probes are connected in parallel with load

10. Which of these best describes a hazard?

Something that is potentially harmful

Tools lying around on the floor

Unlabelled chemicals

All of the above

11. ALL current-using equipment on a building site must be inspected and checked for condition at least once every:

3 Months

Day

Month

Fortnight

12. What is the best fire extinguisher to use on a wood-based fire?

Carbon Dioxide

Water

Dry Powder

Foam

13. Ladders should be erected at the following angle to the ground...

60 degrees

75 degrees

90 degrees

95 degrees

14. The safest way to lift a load is to?

Keep your back rounded at all times

Keep your back straight at all times

Keep your feet as close as possible

Keep your feet slightly apart with your back rounded

15. It is recommended that portable power equipment operating at which voltage is used on a building site:

55v

120v

110v

230v

16. Who should report unsafe working practices at work?

Your line manager only

Your employer

Your safety representative

Anyone who notices it

17. The size of the cables which supply a consumer unit from the electricity meter are typically what size?

25mm2

16mm2

15mm2

32mm2

18. High Voltage is:

Anything between 1000 and 2000 Volts

Anything Greater than 1500 Volts

Anything greater than 1000 Volts

Anything greater than 2000 Volts

19. Ib symbolises :

Nominal supply voltage

Voltage Drop in a circuit

Minimum fuse rating

Design Current of a circuit

20. The maximum permissible VD allowed in a single phase system is:

11.5 Volts

11.5 Ohms

11.5 Amps

20 Volts

21. Electrical fires are best tackled with a ?

Wet chemical fire extinguisher

Water-based fire extinguisher

CO2 Fire Extinguisher

Foam fire extinguisher

22. How many employees does a company need before risk assessments are needed?

5-10

10-20

5 or more

1

23. Which of the following statement is true?

Three-phase supplies typically use 230 v

Single-phase supplies typically use 200 v

Single-phase supplies typically use 400 v

Three-phase supplies typically use 400 v

24. The Electricity at Work regulations came into effect in:

1989

1962

1974

1985

25. Materials in which the outer electrons are not tightly bound in the atoms are called...

Insulators

Conductors

26. ALL houses in a typical street are connected to the same:

Neutral Conductor

Earthing Conductor

Live Conductor

L1 Conductor

27. In which year was the Health and Safety at work act enacted?

1989

1971

1974

1985

28. Certain sections of the Health and Safety at Work Act Regulations put a duty of care upon:

Employees only

Employers only

Both employees and the general public

Both employees and employers

29. BS7671: Requirements for Electrical Installations 17th Edition Regulations are:

Laws of England and must be complied with

Laws of Europe and must be complied with

Not laws, but a British Standard code of practice

Not laws, but a good electrical installation manual

30. The Installation Reference Method for a cable that is clipped directly to a surface is:

D

B

C

A

31. Extra-low voltage (ELV) is:

0 V to 60 V a.c. or d.c.

5 V to 45 V a.c.

0 V to 50 V d.c.

0 V to 50 V a.c.

32. Approximately what is the lowest amount of electricity the human body would be aware of?

10mA

20mA

5mA

1mA

33. The maximum permissible Voltage Drop allowed in a three-phase system is:

15V

20V

25V

35V

34. The connection of a bonding conductor to metal pipework is usually by means of an:

Earth Clamp to BS 951

Earth Clamp to BS 715

Earth Clamp to BS 60898

Earth Clamp to BS 698

35. Wet chemical fire extinguishers are identified by which colour?

Green

Blue

Cream

Yellow

36. Uo symbolises :

Earth fault loop impedance

Nominal supply voltage

Design Current of a circuit

Voltage-drop in a circuit

37. In a domestic dwelling, a socket-outlet should be at least __________ mm from the ground:

450

300

250

350

38. Which of the following is a statutory regulation?

A British Standard

IET Wiring regulations

IEE Codes of Practice

Electricity at Work Regulation

39. Low Voltage (LV) is:

400-750 Volts (ac)

900-1500 Volts (ac)

600-1000 Volts (ac)

40. Under what circumstances should 'trestle' supports NOT be used?

To support scaffold boards

4.5m from the working platform

When the overhang of a scaffold board is greater than 50mm

With a platform height of 3m

41. In a domestic dwelling, a two-way switch should not be installed at a height exceeding:

500mm

950mm

1500mm

1200mm

42. A 'TN-C system' :

Has neutral and protective conductors which are COMBINED in a single conductor in PART of the system

This has SEPERATE neutral and protective conductors hroughout the system.

Has neutral and protective conductors which are COMBINED in a single conductor THROUGHOUT the system

43. What is the minimum disconnection time of any protective device?

0.2 secs

0.5 secs

0.8 secs

0.4 secs

44. Death by electric shock typically occurs when current is at a minimum of...

100mA

80mA

75mA

90mA

45. The Installation Reference Method for a cable that is enclosed in conduit in an insulated wall is:

D

C

A

B

46. How many steps are the to follow when isolating a supply?

3

4

5

6

7

8

47. The marking colour for a Dry Powder fire extinguisher is:

Red

Black

Blue

Cream

48. When testing an SELV/PELV circuit's insulation resistance you should set your testing device to:

110V (AC)

250V (AC)

500V (DC)

250V (DC)

49. The Electricity at Work Regulations apply to:

Electricians only

All persons at work

Engineers only

Persons working with electricity

Mains electricity equipment only

Any electrical equipment

Equipment up to 1000V only

Submit

50. Put the following steps in order for a safe isolation:

Recheck that the voltage indicating device is functioning correctly on a known supply or proving unit

Begin work

Ensure isolation of circuit / equipment by - swiching off, taking out fuses, locking off isolating switches or MCB's

Verify that the device is functioning correctly on a known supply or functioning unit

Verify that the circuit or equipment to be worked upon is dead using a voltage indicating device testing between – phase & earth, phase & neutral, neutral & earth

Locate & identify circuit or equipment to be worked on

Identify means of isolation

Fit warning labels

Select an approved test lamp or voltage testing device