Transformers Exercise

What is the main function of an electrical transformer?

• Transfer electrical energy between circuits

• Convert electrical energy into mechanical energy

• Store electrical energy

• Generate electrical energy

What is the purpose of a step-up transformer?

• To decrease voltage

• To increase voltage

• To decrease current

• To convert AC to DC

What is the purpose of a step-down transformer?

• To convert AC to DC

• To increase voltage

• To amplify current

• To decrease voltage

What is the formula to calculate the turns ratio of a transformer?

• Number of turns in primary coil - Number of turns in secondary coil

• Number of turns in primary coil / Number of turns in secondary coil

• Number of turns in secondary coil / Number of turns in primary coil

• Number of turns in primary coil + Number of turns in secondary coil

What is the primary voltage of a step-up transformer if the secondary voltage is 240V and the turns ratio is 1:5?

• 48V

• 360V

• 120V

• 240V

What is the secondary voltage of a step-down transformer if the primary voltage is 480V and the turns ratio is 2:1?

What happens to the current in a step-up transformer compared to the current in the primary coil?

• lower

• fluctuates

• stays the same

• higher

What happens to the current in a step-down transformer compared to the current in the primary coil?

• The current in the secondary coil is lower.

• The current in the secondary coil is alternating.

• The current in the secondary coil is higher.

• The current in the secondary coil is the same.

What is the advantage of using a step-up transformer in power transmission?

• It decreases the voltage level for long-distance transmission with reduced power losses.

• It has no effect on the voltage level for long-distance transmission.

• It increases the power losses for long-distance transmission with reduced voltage level.

• It increases the voltage level for long-distance transmission with reduced power losses.

What is the advantage of using a step-down transformer in household appliances?

• To convert AC power to DC power for the appliance.

• To regulate the frequency of the power supply for the appliance.

• To increase the voltage from the main power supply to a higher voltage suitable for the appliance.

• To reduce the voltage from the main power supply to a lower voltage suitable for the appliance.