Earthing in Electrical Systems Quiz

What is the main purpose of earthing in electrical systems?

• To increase the current flow

• To ensure safety by preventing electric shock

• To reduce the voltage

• To enhance the efficiency of appliances

What type of earthing is commonly used for domestic installations?

• Plate earthing

• Pipe earthing

• Rod earthing

• Both B and C

Which of the following materials is commonly used for earthing conductors?

• Copper

• Aluminium

• Iron

• Lead

In an electrical fault, if a person touches an ungrounded part of an appliance, what could happen?

• They will experience no effect

• They may receive a mild electric shock

• They will be protected by the fuse

• They will receive a severe electric shock

What is the minimum earth resistance value recommended for earthing in an electrical system?

• Less than 1 ohm

• 2 to 3 ohms

• 5 ohms

• 10 ohms

Which type of earthing is used for large industrial installations?

• Plate earthing

• Pipe earthing

• Rod earthing

• Both A and B

What is the main purpose of an earth electrode in an earthing system?

• To supply current to the system

• To provide a path for electrical current to flow into the ground

• To reduce the voltage of the system

• To insulate the system from electrical faults

What happens if the earthing system is faulty or disconnected?

• The electrical equipment will work more efficiently

• It will increase the risk of electric shock or fire

• It will not affect the system’s operation

• The voltage will decrease

What is the function of an earth busbar in a distribution board?

• To distribute current equally to the load

• To connect all earthing points to a single conductor

• To increase the power supply voltage

• To prevent electrical leakage

Which of the following is a key requirement for an effective earthing system?

• High resistance in the ground

• Low resistance between the earth and the electrode

• Use of non-metallic conductors

• High voltage insulation