CPE30034 Three Phase Wiring Installation Topic 2

What is the primary function of a transformer?

• To measure current

• To change voltage levels

• To store electrical energy

• To convert AC to DC

What type of transformer increases voltage?

• Isolation transformer

• Auto transformer

• Step-up transformer

• Step-down transformer

Which component is essential for cooling in a transformer?

• Breather

• Cooling fins

• Tap changer

• Bushing

What does the term 'N1/N2 = V1/V2' represent in transformers?

• Power ratio

• Winding ratio

• Voltage ratio

• Current ratio

What is the purpose of a Buchholz relay?

• To regulate temperature

• To detect gas and oil leaks

• To control the tap changer

• To measure voltage

In a star connection, what is the voltage relationship between phases?

• No voltage exists between phases

• Phase voltage is double the line voltage

• Phase voltage is 1/√3 of line voltage

• Equal voltage across all phases

What is the main advantage of a Delta-Delta connection?

• Higher voltage output

• Easier to balance loads

• Reduced phase displacement

• Lower insulation requirements

How often should routine maintenance be performed on a transformer?

• Every year

• Every 6 months

• Every month

• Every 2 years

What is the primary purpose of the oil in a transformer?

• To store energy

• To insulate

• To cool

• To lubricate

What happens if the frequency of the supply does not match the transformer's design?

• It operates normally

• It will increase efficiency

• It will reduce output voltage

• It may overheat