Electrical Installation #1
The easiest part!
- 1.
Materials in which the outer electrons are not tightly bound in the atoms are called...
- A.
Insulators
- B.
Conductors
Correct Answer
B. Conductors -
- 2.
What is the unit of Electro-Motive Force (EMF)?
- A.
Volts
- B.
Amps
- C.
Ohms
Correct Answer
A. Volts -
- 3.
Approximately what is the lowest amount of electricity the human body would be aware of?
- A.
10mA
- B.
20mA
- C.
5mA
- D.
1mA
Correct Answer
D. 1mA -
- 4.
Death by electric shock typically occurs when current is at a minimum of...
- A.
100mA
- B.
80mA
- C.
75mA
- D.
90mA
Correct Answer
B. 80mA -
- 5.
High Voltage is:
- A.
Anything between 1000 and 2000 Volts
- B.
Anything Greater than 1500 Volts
- C.
Anything greater than 1000 Volts
- D.
Anything greater than 2000 Volts
Correct Answer
C. Anything greater than 1000 Volts -
- 6.
When measuring for Resistance, you should always:
- A.
Ensure testing probes are connected in series with load
- B.
Ensure supply is off
- C.
Ensure supply has been running for at least 2 minutes
- D.
Ensure testing probes are connected in parallel with load
Correct Answer
B. Ensure supply is off -
- 7.
The size of the cables which supply a consumer unit from the electricity meter are typically what size?
- A.
25mm2
- B.
16mm2
- C.
15mm2
- D.
32mm2
Correct Answer
A. 25mm2 -
- 8.
The Electricity at Work Regulations apply to:
- A.
Electricians only
- B.
All persons at work
- C.
Engineers only
- D.
Persons working with electricity
- E.
Mains electricity equipment only
- F.
Any electrical equipment
- G.
Equipment up to 1000V only
Correct Answer(s)
B. All persons at work
D. Persons working with electricity
F. Any electrical equipment -
- 9.
Extra-low voltage (ELV) is:
- A.
0 V to 60 V a.c. or d.c.
- B.
5 V to 45 V a.c.
- C.
0 V to 50 V d.c.
- D.
0 V to 50 V a.c.
Correct Answer
D. 0 V to 50 V a.c. -
- 10.
A 'TN-C system' :
- A.
Has neutral and protective conductors which are COMBINED in a single conductor in PART of the system
- B.
This has SEPERATE neutral and protective conductors hroughout the system.
- C.
Is a system having NO DIRECT CONNECTION between live parts and Earth, the exposed conductive parts of the electrical installation being EARTHED.
- D.
Has neutral and protective conductors which are COMBINED in a single conductor THROUGHOUT the system
Correct Answer
D. Has neutral and protective conductors which are COMBINED in a single conductor THROUGHOUT the system -
- 11.
What is the usual single phase voltage supply to a domestic installation?
- A.
430V
- B.
110V
- C.
230V
- D.
360V
Correct Answer
C. 230V -
- 12.
The frequency of the mains supply in the UK is:
- A.
50Hz
- B.
60Hz
- C.
70Hz
- D.
40Hz
Correct Answer
A. 50Hz -
- 13.
ALL houses in a typical street are connected to the same:
- A.
Neutral Conductor
- B.
Earthing Conductor
- C.
Live Conductor
- D.
L1 Conductor
Correct Answer
A. Neutral Conductor -
- 14.
Low Voltage (LV) is:
- A.
400-750 Volts (ac)
- B.
900-1500 Volts (ac)
- C.
600-1000 Volts (ac)
Correct Answer
C. 600-1000 Volts (ac) -
- 15.
The connection of a bonding conductor to metal pipework is usually by means of an:
- A.
Earth Clamp to BS 951
- B.
Earth Clamp to BS 715
- C.
Earth Clamp to BS 60898
- D.
Earth Clamp to BS 698
Correct Answer
A. Earth Clamp to BS 951 -
- 16.
How many employees does a company need before risk assessments are needed?
- A.
5-10
- B.
10-20
- C.
5 or more
- D.
1
Correct Answer
C. 5 or more -
- 17.
Which of these best describes a hazard?
- A.
Something that is potentially harmful
- B.
Tools lying around on the floor
- C.
Unlabelled chemicals
- D.
All of the above
Correct Answer
D. All of the above -
- 18.
What is the cause of most accidents?
- A.
Poisoning
- B.
Slips, trips and falls
- C.
Electrocution
- D.
Suffocation
Correct Answer
B. Slips, trips and falls -
- 19.
In which year was the Health and Safety at work act enacted?
- A.
1989
- B.
1971
- C.
1974
- D.
1985
Correct Answer
C. 1974 -
- 20.
Wet chemical fire extinguishers are identified by which colour?
- A.
Green
- B.
Blue
- C.
Cream
- D.
Yellow
Correct Answer
D. Yellow -
- 21.
The safest way to lift a load is to?
- A.
Keep your back rounded at all times
- B.
Keep your back straight at all times
- C.
Keep your feet as close as possible
- D.
Keep your feet slightly apart with your back rounded
Correct Answer
B. Keep your back straight at all times -
- 22.
Where would you go if your fire alarm was activated?
- A.
The manager's office
- B.
The fire assembly point
- C.
Go to your car and wait
- D.
Clock out and go home immediately
Correct Answer
B. The fire assembly point -
- 23.
Electrical fires are best tackled with a ?
- A.
Wet chemical fire extinguisher
- B.
Water-based fire extinguisher
- C.
CO2 Fire Extinguisher
- D.
Foam fire extinguisher
Correct Answer
C. CO2 Fire Extinguisher -
- 24.
Who should report unsafe working practices at work?
- A.
Your line manager only
- B.
Your employer
- C.
Your safety representative
- D.
Anyone who notices it
Correct Answer
D. Anyone who notices it -
- 25.
This unit measures 'charge'
- A.
Volt
- B.
Ampere
- C.
Coulomb
- D.
Ohm
Correct Answer
C. Coulomb -
- 26.
Ladders should be erected at the following angle to the ground...
- A.
60 degrees
- B.
75 degrees
- C.
90 degrees
- D.
95 degrees
Correct Answer
B. 75 degrees -
- 27.
Which of the following is a statutory regulation?
- A.
A British Standard
- B.
IET Wiring regulations
- C.
IEE Codes of Practice
- D.
Electricity at Work Regulation
Correct Answer
D. Electricity at Work Regulation -
- 28.
Certain sections of the Health and Safety at Work Act Regulations put a duty of care upon:
- A.
Employees only
- B.
Employers only
- C.
Both employees and the general public
- D.
Both employees and employers
Correct Answer
D. Both employees and employers -
- 29.
The Electricity at Work regulations came into effect in:
- A.
1989
- B.
1962
- C.
1974
- D.
1985
Correct Answer
A. 1989 -
- 30.
How many steps are the to follow when isolating a supply?
- A.
3
- B.
4
- C.
5
- D.
6
- E.
7
- F.
8
Correct Answer
D. 6 -
- 31.
It is recommended that portable power equipment operating at which voltage is used on a building site:
- A.
55v
- B.
120v
- C.
110v
- D.
230v
Correct Answer
C. 110v -
- 32.
The marking colour for a Dry Powder fire extinguisher is:
- A.
Red
- B.
Black
- C.
Blue
- D.
Cream
Correct Answer
C. Blue -
- 33.
Under what circumstances should 'trestle' supports NOT be used?
- A.
To support scaffold boards
- B.
4.5m from the working platform
- C.
When the overhang of a scaffold board is greater than 50mm
- D.
With a platform height of 3m
Correct Answer
B. 4.5m from the working platform -
- 34.
ALL current-using equipment on a building site must be inspected and checked for condition at least once every:
- A.
3 Months
- B.
Day
- C.
Month
- D.
Fortnight
Correct Answer
A. 3 Months -
- 35.
What is the best fire extinguisher to use on a wood-based fire?
- A.
Carbon Dioxide
- B.
Water
- C.
Dry Powder
- D.
Foam
Correct Answer
B. Water -
- 36.
In relation to Health and Safety an employer must provide all of the following except for:
- A.
Safety training
- B.
Information to staff involving safety risks
- C.
Safe areas for access and exit routes to and from a site
- D.
A copy of BS7671
Correct Answer
D. A copy of BS7671 -
- 37.
Which of the following statement is true?
- A.
Three-phase supplies typically use 230 v
- B.
Single-phase supplies typically use 200 v
- C.
Single-phase supplies typically use 400 v
- D.
Three-phase supplies typically use 400 v
Correct Answer
D. Three-phase supplies typically use 400 v -
- 38.
In a domestic dwelling, a two-way switch should not be installed at a height exceeding:
- A.
500mm
- B.
950mm
- C.
1500mm
- D.
1200mm
Correct Answer
D. 1200mm -
- 39.
Uo symbolises :
- A.
Earth fault loop impedance
- B.
Nominal supply voltage
- C.
Design Current of a circuit
- D.
Voltage-drop in a circuit
Correct Answer
B. Nominal supply voltage -
- 40.
Ib symbolises :
- A.
Nominal supply voltage
- B.
Voltage Drop in a circuit
- C.
Minimum fuse rating
- D.
Design Current of a circuit
Correct Answer
D. Design Current of a circuit -
- 41.
The maximum permissible VD allowed in a single phase system is:
- A.
11.5 Volts
- B.
11.5 Ohms
- C.
11.5 Amps
- D.
20 Volts
Correct Answer
A. 11.5 Volts -
- 42.
The maximum permissible Voltage Drop allowed in a three-phase system is:
- A.
15V
- B.
20V
- C.
25V
- D.
35V
Correct Answer
B. 20V -
- 43.
The Installation Reference Method for a cable that is clipped directly to a surface is:
- A.
D
- B.
B
- C.
C
- D.
A
Correct Answer
C. C -
- 44.
The Installation Reference Method for a cable that is enclosed in conduit in an insulated wall is:
- A.
D
- B.
C
- C.
A
- D.
B
Correct Answer
C. A -
- 45.
FELV stands for:
- A.
Functional extra-low voltage
- B.
Fixed extra-low voltage
- C.
Flourescent extra-low voltage
- D.
Freestyle extra-low voltage
Correct Answer
A. Functional extra-low voltage -
- 46.
When testing an SELV/PELV circuit's insulation resistance you should set your testing device to:
- A.
110V (AC)
- B.
250V (AC)
- C.
500V (DC)
- D.
250V (DC)
Correct Answer
D. 250V (DC) -
- 47.
What is the minimum disconnection time of any protective device?
- A.
0.2 secs
- B.
0.5 secs
- C.
0.8 secs
- D.
0.4 secs
Correct Answer
D. 0.4 secs -
- 48.
In a domestic dwelling, a socket-outlet should be at least __________ mm from the ground:
- A.
450
- B.
300
- C.
250
- D.
350
Correct Answer
A. 450 -
- 49.
BS7671: Requirements for Electrical Installations 17th Edition Regulations are:
- A.
Laws of England and must be complied with
- B.
Laws of Europe and must be complied with
- C.
Not laws, but a British Standard code of practice
- D.
Not laws, but a good electrical installation manual
Correct Answer
C. Not laws, but a British Standard code of practice -
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-
Current Version
-
Mar 15, 2022Quiz Edited by
ProProfs Editorial Team -
Feb 05, 2013Quiz Created by
Kthnks64
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