Understanding Transformers and Their Applications

What is the primary function of a step-up transformer?

• To increase the current

• To increase the voltage

• To decrease the voltage

• To decrease the current

In a transformer, what type of current is required for its operation?

• Direct Current (DC)

• Alternating Current (AC)

• Both AC and DC

• Neither AC nor DC

What is the relationship between the primary and secondary voltages in a transformer given by the transformer equation?

What is the main reason for using a step-up transformer in power transmission?

• To reduce energy loss over long distances

• To increase the frequency of the current

• To convert AC to DC

• To increase the current

Which of the following is NOT a characteristic of a step-down transformer?

• It decreases voltage

• It increases current

• It is used in power adapters

• It increases voltage

Why can't transformers operate with direct current (DC)?

• DC has a constant voltage

• DC does not produce a changing magnetic field

• DC is too powerful for transformers

• DC is not efficient

What is the unit of measurement for the power loss in a transformer?

• Watts

• Volts

• Amperes

• Ohms

In a step-up transformer, if the primary coil has 100 turns and the secondary coil has 500 turns, what is the turns ratio?

• 1:5

• 5:1

• 1:10

• 10:1

What is the effect of a step-down transformer on the current in the secondary coil compared to the primary coil?

• The current decreases

• The current remains the same

• The current increases

• The current is zero

What is the primary purpose of using transformers in the national grid?

• To convert AC to DC

• To regulate the frequency of electricity

• To adjust voltage levels for efficient transmission

• To store electrical energy