WorksheetsElectrical Cable and Wiring Quiz (2.5-8)
Total questions: 33
Worksheet time: 17mins
What is the primary function of the insulation in an electrical cable?
To enhance conductivity
To prevent leakage of current
To carry the current
To provide mechanical protection
Which of the following materials is NOT commonly used as a conductor in electrical cables?
Copper
Steel
Gold
Aluminium
What type of insulation is most commonly used in residential wiring?
Rubber
PVC
Silicone
Polyethylene
Which of the following is a property of a good conductor?
High resistivity
Brittleness
Low conductivity
High conductivity
What does the term 'stranding' refer to in the context of conductors?
The twisting together of smaller wires
The method of connecting cables
The process of insulating wires
The type of insulation used
What is the purpose of mechanical protection in electrical cables?
To provide insulation
To protect against mechanical damage
To prevent leakage of current
To enhance conductivity
Which of the following is a disadvantage of PVC insulation?
High cost
Brittleness at low temperatures
Poor flexibility
High resistivity
What is the main advantage of using aluminium cables for overhead supply lines?
Lighter weight
Higher flexibility
Lower cost
Better conductivity
What is the purpose of a circuit protective conductor (CPC)?
To provide insulation
To carry the current
To enhance mechanical protection
To connect to the main earthing terminal
In a two-way switch control system, how many terminals does each switch have?
5
4
3
2
What is the main characteristic of a flexible cable?
It contains a group of fine wires
It is made of copper only
It consists of solid wires
It is always insulated with rubber
What is the primary function of a glow starter in a fluorescent lamp circuit?
To increase efficiency
To initiate the discharge
To stabilize the current
To provide high voltage
What is the maximum number of lights recommended on a single lighting circuit in a domestic installation?
5
15
20
10
What is the main advantage of using electronic ballasts for fluorescent lamps?
Higher power consumption
Flicker-free starting
Lower initial cost
Increased size
What is the purpose of a caution notice on distribution boards when using new cable color codes?
To mark the circuit type
To provide safety information
To indicate the voltage rating
To inform about the type of insulation
What is the main disadvantage of using incandescent lamps?
Complex installation
Short lifespan
High initial cost
Low light output
What is the primary function of a circuit breaker in a final circuit?
To connect appliances
To provide insulation
To protect against overloads
To enhance conductivity
What type of wiring system is buried beneath plaster or cement?
Trunking wiring
Flexible wiring
Concealed wiring
Surface wiring
What is the recommended cable size for a spur connection in a ring final circuit?
4 mm2
6 mm2
1.5 mm2
2.5 mm2
What is the main purpose of using armoured cables?
To enhance flexibility
To provide mechanical protection
To reduce costs
To improve conductivity
What is the maximum rating for a fused spur connected to a ring final circuit?
13A
10A
16A
20A
What is the main characteristic of a cold-cathode discharge lamp?
It requires pre-heating
It operates at high voltage
It has a longer lifespan
It is less efficient
What is the primary advantage of LED lamps over incandescent lamps?
Higher energy efficiency
Brighter light output
Lower cost
Easier installation
What is the purpose of using a double pole switch for fixed equipment?
To reduce costs
To control multiple circuits
To provide isolation
To enhance flexibility
What is the main disadvantage of using PVC conduits?
Difficult installation
Limited mechanical protection
High cost
Poor insulation
What is the primary function of a consumer unit in a household electrical system?
To connect appliances
To enhance flexibility
To provide insulation
To distribute power
What is the maximum voltage drop allowed for a nominal voltage of 230 V according to the text?
12.5 V
10.0 V
9.2 V
4.6 V
What is the typical maximum current rating for a standard 2.5 sq mm twin cable in single phase?
32A
16A
25A
20A
What is the primary purpose of a residual current device (RCD)?
To protect against overloads
To prevent electric shock
To enhance circuit efficiency
To regulate voltage frequency
What is the main function of a surge protector in an electrical system?
To protect devices from voltage spikes
To prevent electrical fires
To improve energy efficiency
To increase voltage
What is the purpose of 2-way switches to control lighting?
Consistent
Cost Effective
Complex Setup
Convenience
What is the range of low voltage range?
(a)
Which of the following voltage do not exceed for extra low voltage?
-10V
50V
100V
500V
