PSS: Quiz on Power System & Switchboard

What is a switchboard defined as?

• An assembly of switchgear with or without instruments

• A type of electrical transformer

• A type of circuit breaker

• A measuring instrument for voltage

Which type of switchboard has live parts accessible from all sides?

• Dead-front type

• Cubicle type

• Open type

• Enclosed type

What is the main function of a main switchboard?

• To provide emergency lighting

• To connect to the power supply authority

• To measure current and voltage

• To control, protect, and distribute electricity

What does a sub-switchboard do?

• It protects against electrical faults

• It measures the voltage of the system

• It splits the incoming supply into outgoing branch circuits

• It connects to the main power supply

What is the purpose of protection circuits in a main switchboard?

• To measure the voltage

• To connect different switchboards

• To monitor abnormal conditions in the system

• To provide emergency power

What type of circuit breaker is typically used in a main switchboard?

• Miniature circuit breaker (MCB)

• Current transformer

• Moulded case circuit breaker (MCCB)

• Earth fault relay

What is the function of measuring circuits in a main switchboard?

• To control the power supply

• To connect to the emergency supply

• To indicate the status of the system

• To protect against overloads

What is the minimum cross-sectional area of the earth bar in a switchboard?

• 100 mm²

• 30 mm²

• 70 mm²

• 50 mm²

Where do the incoming cables typically enter a switchboard?

• Only from the bottom

• Only from the top

• From the sides

• From the top or bottom

What is the purpose of the emergency switchboard?

• To supply essential services during a power failure

• To supply electricity during normal conditions

• To connect multiple switchboards

• To provide power to non-essential services