What is the size of the main earthing conductor for a modern property according to the T Level Technical Qualification in Building Services Engineering for Construction document?

It varies depending on the circuit

What type of protective conductor is needed if a property is without residual current device (RCD) protection and all extraneous pipework in kitchens and bathrooms are bonded together?

Equipotential bonding conductor

What is the purpose of using a long lead in relation to RCD protection in kitchens and bathrooms?

To ensure that pipework from kitchens and bathrooms registers very low values of resistance

To connect all exposed and extraneous metalwork together

To bond all extraneous pipework in kitchens and bathrooms

To vary the size of the circuit protective conductor

What is the purpose of earthing in electrical systems?

To provide a low resistance path for fault current

To increase the resistance of electrical circuits

To provide a high resistance path for fault current

To prevent the operation of protective devices

What is the result of earthing when a fault current flows through the system?

It operates a protective device that shuts off the supply

It increases the supply of electricity

It has no effect on the electrical supply

What does ADS stand for in the context of earthing?

Automatic Disconnection of Supply

What is the principle of electrical bonding?

It states that if all extraneous conductive parts are linked to the earthing system, then all exposed and extraneous metallic parts will be at the same potential.

It ensures that all conductive parts are not connected to the earthing system.

It isolates all extraneous conductive parts from the earthing system to prevent electrical shocks.

It requires all metallic parts to be insulated from each other to prevent conduction.

What is the effect of main equipotential bonding on the possibility of dangerous voltages forming?

It reduces the possibility of dangerous voltages forming.

It increases the possibility of dangerous voltages forming.

It has no effect on the possibility of dangerous voltages forming.

It only affects the voltage levels in overhead power lines.

Why are birds not electrocuted when they perch on overhead power lines?

Because of the principle that links all conductive parts to the earthing system, making them at the same potential.

Because birds are not good conductors of electricity.

Because the power lines are insulated.

Because the birds only touch one wire at a time.

What does the letter 'T' stand for in the earthing arrangement acronyms TN-S, TN-C-S, and TT?

Earth (from the French word terre)

How have modern installation systems changed in relation to the external main earthing terminal?

They have removed the need for an external main earthing terminal.

They have added an additional external main earthing terminal.

They have replaced the external main earthing terminal with a neutral terminal.

They have made the external main earthing terminal larger.

What does the TN-S earthing system use as the earthing conductor?

The metal armour of the supply cable

To what is the armour connected in a TN-S earthing system?

The main earthing terminal (MET)

What is connected to the earthing bar in the TN-S earthing system?

Both circuit protective and equipotential bonding conductors

Only the circuit protective conductors

Only the equipotential bonding conductors

Neither circuit protective nor equipotential bonding conductors

Where will a fault current flow back to in a TN-S earthing system?

The supply transformer through the supply cable armour

In a TN-CS earthing system, what happens when a fault current flows?

It flows back to the supply transformer through the neutral.

It dissipates into the ground immediately.

It remains isolated from the neutral.

What is the TN-CS earthing system also referred to as?

PME (Protective Multiple Earthing)

PNE (Protective Neutral Earthing)

TNC (Transformer Neutral Combined)

CME (Combined Multiple Earthing)

Where is the TN-CS earthing system NOT authorised for use?

Control stations, marina pontoons, or caravan parks

Where is the TT earthing system mostly used?

In rural areas where the supply system has yet to be upgraded

In urban areas with advanced supply systems

In coastal areas to prevent corrosion

In industrial areas with heavy machinery

What must be in place in a TT earthing system to return a fault current to the supply transformer?

A direct connection to the main supply

A large connection chamber for the earth conductor

A copper electrode driven into the ground

Who is responsible for the earth electrode in a TT earthing system?

The supplier of the electricity

The manufacturer of the earthing system

What is the result of having an electrical supply that relies on a negative conductor to complete a circuit and is adequately insulated?

C) A short circuit fault cannot exist.

A) A short circuit fault will always exist.

B) The circuit will not work when put to use.

D) The appliance will be a danger to the person using it.

What can be a consequence of adequate insulation in an electrical appliance?

D) It ensures the appliance is not a danger to the person using it.

A) It increases the risk of a short circuit fault.

B) It makes the appliance dangerous to use.

C) It has no impact on the safety of the appliance.

BSE UNIT 12 LESSON 15 Electrical Systems and Protection Quiz

12th Grade

•

59 Qs

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BSE UNIT 12 LESSON 15 Electrical Systems and Protection Quiz

Quiz

•

Professional Development

•

12th Grade

•

Practice Problem

•

Hard

Miles Tarplee

FREE Resource

59 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What should learners be able to understand by the end of the session regarding basic and fault protection?

The different types of electrical systems

The meaning of basic protection and fault protection

The cost of installing basic protection and fault protection

The history of basic protection and fault protection

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What concept related to equipotential bonding are learners expected to describe?

The materials used for equipotential bonding

The concept of equipotential bonding and the consequences of not having it in place

The electrical resistance of equipotential bonding

The color coding of wires used in equipotential bonding

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are learners supposed to explain regarding the earthing of electrical systems?

The design of electrical earthing systems

The manufacturers of earthing systems

The hazards of inadequate earthing of electrical systems and appliances

The installation process of earthing systems

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many methods of mains earthing should learners be able to demonstrate?

One

Two

Three

Four

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is known as basic protection against electric shock?

Using rubber gloves while handling wires

Ensuring all electrical equipment is turned off

The four basic ways to protect a person from making direct contact with live electrical parts

Installing circuit breakers in the electrical system

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT one of the basic ways to protect a person from electric shock as mentioned in the material?

Surrounding conductors with insulation

Placing live parts out of reach

Using warning signs for electrical hazards

Placing a barrier between a person and live parts

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why can't hazards from electricity be detected by seeing or hearing?

Because electricity is always silent and invisible

Because electricity can only be felt when touched

Because electricity moves too fast to be seen or heard

Because there is no advance warning for electrical hazards

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BSE UNIT 12 LESSON 15 Electrical Systems and Protection Quiz

59 questions

What should learners be able to understand by the end of the session regarding basic and fault protection?

What concept related to equipotential bonding are learners expected to describe?

What are learners supposed to explain regarding the earthing of electrical systems?

How many methods of mains earthing should learners be able to demonstrate?

What is known as basic protection against electric shock?

Which of the following is NOT one of the basic ways to protect a person from electric shock as mentioned in the material?

Why can't hazards from electricity be detected by seeing or hearing?

What do we classify metallic objects that form part of an electrical installation as?

Metallic objects that do not form part of an electrical installation are classified as what?

What is required for a metal consumer unit that is exposed?

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