Question 1

An appropriate wiring method for a high-temperature installation in a boiler house is:
A) metal conduit installation
B) trunking and tray installation
C) FP200 cables
D) MI cables.

Accepted Answer

C,D

Question 2

Which of the following fixing methods would be suitable for securing a heavy electric motor to a concrete bed?
A) cable clip
B) Rawlbolt
C) screw fixing to plastic plug
D) spring toggle.

Accepted Answer

Rawlbolts are designed for heavy-duty applications on concrete and masonry. They provide a strong and reliable fixing method for securing heavy objects such as electric motors. Cable clips and screw fixings to plastic plugs are not suitable for heavy loads, and spring toggles may not provide enough strength or stability for a heavy motor.

Question 3

Which of the following fixing methods would be suitable for holding a PVC insulated and sheathed cable onto a wood surface such as a ceiling joist?
A) cable clip
B) Rawlbolt
C) screw fixing to plastic plug
D) spring toggle.

Accepted Answer

A cable clip would be suitable for holding a PVC insulated and sheathed cable onto a wood surface such as a ceiling joist. Rawlbolt and spring toggle are more suitable for fixing onto concrete or brick surfaces. Screw fixing to plastic plug may not be strong enough to hold the weight of the cable.

Question 4

Which of the following fixing methods would be suitable for holding a medium-weight load onto a brick wall?
A) cable clip
B) Rawlbolt
C) screw fixing to plastic plug
D) spring toggle.

Accepted Answer

The answer of Which of the following fixing methods would...

Question 5

Which of the following fixing methods would be suitable for holding a lightweight load on a plasterboard partition?
A) cable clip
B) Rawlbolt
C) screw fixing to plastic plug
D) spring toggle.

Accepted Answer

Spring toggles are designed to spread the load over a larger area of the plasterboard, making them suitable for holding lightweight loads securely.

Question 6

A PVC conduit installation would be suitable for the following type of installation:
A) commercial
B) domestic
C) horticultural
D) industrial.

Accepted Answer

The answer of A PVC conduit installation would be suitable...

Question 7

A PVC insulated and sheathed wiring system would be suitable for the following type of installation:
A) commercial
B) domestic
C) horticultural
D) industrial.

Accepted Answer

PVC insulated and sheathed wiring systems are commonly used in domestic installations due to their durability, safety, and cost-effectiveness. They are designed to meet the electrical needs of homes, providing a reliable and safe method of power distribution.

Question 8

The protection provided by protective equipotential bonding and automatic disconnection of the supply is called:
A) overload protection
B) short-circuit protection
C) basic protection
D) fault protection.

Accepted Answer

Fault protection is the correct term for the protection provided by protective equipotential bonding and automatic disconnection of the supply. This type of protection is designed to prevent electric shock in the event of a fault that could cause a dangerous voltage to appear on accessible conductive parts.

Question 9

The protection provided by insulating the live parts of the electrical installation is called:
A) overload protection
B) short-circuit protection
C) basic protection
D) fault protection.

Accepted Answer

The protection provided by insulating the live parts of the electrical installation is known as basic protection. It is the first level of protection provided to ensure safety in the electrical system. Overload protection, short-circuit protection, and fault protection are different types of protective devices used in the electrical system, but they do not relate to the insulation of live parts.

Question 10

The gas, water and central heating pipes of the building not forming a part of the electrical installation are called:
A) earth conductors
B) bonding conductors
C) exposed conductive parts
D) extraneous conductive parts.

Accepted Answer

Gas, water and central heating pipes are not part of the electrical installation and hence, are considered extraneous conductive parts.

Question 11

The conduit and trunking parts of the electrical installation are:
A) earth conductors
B) bonding conductors
C) exposed conductive parts
D) extraneous conductive parts.

Accepted Answer

The conduit and trunking parts of an electrical installation are considered to be exposed conductive parts, which are conductive parts that could be touched and, under fault conditions, become live. This is why they must be effectively earthed to protect against electric shock. Earth conductors, bonding conductors, and extraneous conductive parts are all related to earthing and bonding of electrical installations, but do not directly refer to the conduit and trunking parts.

Question 12

The linking together of the exposed or extraneous conductive parts of an installation for the purpose of safety is one definition of:
A) earthing
B) protective equipotential bonding
C) exposed conductive parts
D) extraneous conductive parts.

Accepted Answer

Protective equipotential bonding is the linking together of exposed or extraneous conductive parts of an installation for the purpose of safety. Earthing (A) refers specifically to the connection of a conductor to the earth electrode or a local earth. Exposed conductive parts (C) are conductive parts of equipment or installations that are accessible, while extraneous conductive parts (D) are conductive parts that are not intended to conduct current but may do so in certain circumstances, such as metal pipes or structure.

Question 13

The connection of the exposed conductive parts of an installation to the main protective earthing terminal of the installation is one definition of:
A) earthing
B) protective equipotential bonding
C) overload
D) short circuit.

Accepted Answer

Earthing refers to the connection of the exposed conductive parts of an installation to the earth, typically through a main protective earthing terminal, to ensure safety by preventing electric shock in case of a fault.

Question 14

A scale drawing which shows the original intention for the position of electrical equipment is called a:
A) wiring diagram
B) detail assembly drawing
C) site plan or layout drawing
D) as-fitted drawing.

Accepted Answer

A site plan or layout drawing is typically used to show the original intended position of equipment, including electrical equipment. A wiring diagram is a more detailed drawing specifically focused on electrical connections. A detail assembly drawing may show specific components and how they fit together, but it is not necessarily focused on the positioning of electrical equipment. An as-fitted drawing would show the final installed positions of electrical equipment, rather than the original intention.

Question 15

A scale drawing which shows the actual position of the electrical equipment upon completion of the contract is called a:
A) wiring diagram
B) detail assembly drawing
C) site plan or layout drawing
D) as-fitted drawing.

Accepted Answer

A scale drawing which shows the actual position of the electrical equipment upon completion of the contract is called an as-fitted drawing. Wiring diagrams show the connections between electrical components, detail assembly drawings show the specific construction details of a component, and site plan or layout drawings show the overall layout of a site or building.

Question 16

A steel trunking installation would be suitable for the following type of installation:
A) commercial
B) domestic
C) horticultural
D) industrial.

Accepted Answer

Steel trunking is a heavy-duty and durable wiring solution suitable for industrial and commercial applications where durability, protection, and safety are essential. It can withstand the rigors of harsh environments, heavy loads, and high traffic areas. Therefore, A and D are the best choices for steel trunking installation. Domestic and horticultural installations typically do not require such heavy-duty solutions.

Question 17

A steel conduit installation would be suitable for the following type of installation:
A) commercial
B) domestic
C) horticultural
D) industrial.

Accepted Answer

Steel conduit installations are suitable for commercial and industrial environments due to their durability and ability to protect wiring from physical damage and environmental factors.

Question 18

Electricity is distributed from the local substations by underground cables at:
A) 230 V
B) 400 V
C) 25 kV
D) 132 kV.

Accepted Answer

Electricity is typically distributed from local substations to consumers at lower voltages such as 230 V (for residential use) and 400 V (for commercial or industrial use). Higher voltages like 25 kV and 132 kV are used for transmission over longer distances, not for local distribution.

Question 19

Electricity is transmitted at very high voltages because for a given power the:
A) current is reduced
B) current is increased
C) losses are reduced
D) losses are increased.

Accepted Answer

Transmitting electricity at high voltages reduces the current for a given power level, which in turn reduces the losses due to the resistance of the transmission lines. This is because power loss in a conductor is proportional to the square of the current (P = I^2R).

Question 20

An appropriate wiring system for a three-phase industrial installation would be:
A) PVC cables
B) PVC conduit
C) one which meets the requirements of Part 2 of the IET Regulations
D) one which meets the requirements of Part 5 of the IET Regulations

Accepted Answer

The answer of An appropriate wiring system for a three-phase...

Quiz 3: Principles of Electrical Science

An appropriate wiring method for a high-temperature installation in a boiler house is:

Which of the following fixing methods would be suitable for securing a heavy electric motor to a concrete bed?

Which of the following fixing methods would be suitable for holding a PVC insulated and sheathed cable onto a wood surface such as a ceiling joist?

Which of the following fixing methods would be suitable for holding a medium-weight load onto a brick wall?

Which of the following fixing methods would be suitable for holding a lightweight load on a plasterboard partition?

A PVC conduit installation would be suitable for the following type of installation:

A PVC insulated and sheathed wiring system would be suitable for the following type of installation:

The protection provided by protective equipotential bonding and automatic disconnection of the supply is called:

The protection provided by insulating the live parts of the electrical installation is called:

The gas, water and central heating pipes of the building not forming a part of the electrical installation are called:

The conduit and trunking parts of the electrical installation are:

The linking together of the exposed or extraneous conductive parts of an installation for the purpose of safety is one definition of:

The connection of the exposed conductive parts of an installation to the main protective earthing terminal of the installation is one definition of:

A scale drawing which shows the original intention for the position of electrical equipment is called a:

A scale drawing which shows the actual position of the electrical equipment upon completion of the contract is called a:

A steel trunking installation would be suitable for the following type of installation:

A steel conduit installation would be suitable for the following type of installation:

Electricity is distributed from the local substations by underground cables at:

Electricity is transmitted at very high voltages because for a given power the:

An appropriate wiring system for a three-phase industrial installation would be: