A10 ENI 2024 T2 SBQ3 Revision

What is the primary function of a transformer?

• To convert electrical energy into mechanical energy

• To convert mechanical energy into electrical energy

• To step up or step down alternating current/voltage

• To store electrical energy

In a step-up transformer, compared to the input voltage, the output voltage is:

• Lower

• Equal

• Higher

• Constant

Which material is commonly used as the core of a transformer to enhance its efficiency?

• Copper

• Silver

• Aluminum

• Iron

What is the principle behind the operation of a transformer?

• Electromagnetic induction

• Photoelectric effect

• Quantum tunneling

• Doppler effect

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

• It increases

• It decreases

• It remains the same

• It fluctuates

What is the efficiency of an ideal transformer?

• 0%

• 50%

• 100%

• It depends on the input voltage

What happens to the power in a transformer compared to the input power?

• It increases

• It decreases

• It remains the same

• It fluctuates

What is the nucleus of an atom primarily composed of?

• Electrons and protons

• Neutrons and electrons

• Neutrons and protons

• Protons only

Which subatomic particle carries a positive electrical charge?

• Neutron

• Electron

• Proton

• Alpha particle

What is the charge of the nucleus of an atom?

• Neutral

• Positive

• Negative

• Variable