Level 3 Electrical Principles Quiz

What is the primary function of a transformer?

• To convert AC to DC

• To step up or step down voltage

• To store electrical energy

• To measure electrical power

What is the core material commonly used in transformers?

• Copper

• Aluminum

• Silicon steel

• Plastic

What is the efficiency of a transformer typically?

• 50-60%

• 70-80%

• 90-99%

• 100%

Which type of transformer is used for electrical isolation?

• Step-up transformer

• Step-down transformer

• Isolation transformer

• Auto transformer

What is the main cause of energy loss in a transformer?

• Copper loss

• Iron loss

• Both A and B

• None of the above

What is the equation for the turns ratio in a transformer?

• Vp/Vs = Np/Ns

• Vp/Vs = Ns/Np

• Vp × Vs = Np × Ns

• Vp + Vs = Np + Ns

What is the purpose of a step-up transformer?

• To increase current

• To decrease current

• To increase voltage

• To decrease voltage

Which type of transformer is used for voltage regulation?

• Step-up transformer

• Step-down transformer

• Auto transformer

• Isolation transformer

What are the two main types of transformer losses?

• Copper loss and mechanical loss

• Iron loss and mechanical loss

• Copper loss and iron loss

• Mechanical loss and thermal loss

What is the typical frequency of AC supply in the UK?

• 50 Hz

• 60 Hz

• 100 Hz

• 120 Hz