Question 1 of 10
What is the primary function of a relay?
Relays are designed to control high-power circuits using low-power control signals, enabling safe and isolated switching.
Question 2 of 10
What component in a relay is activated by a low-voltage control signal?
The control coil is an electromagnetic coil that creates a magnetic field when energized by the control signal.
Question 3 of 10
What is the function of the armature in a relay?
The armature is the moving part that actuates the contacts based on the magnetic field generated by the control coil.
Question 4 of 10
What type of contact is closed when the relay is activated?
The NO contact closes when the relay is energized, allowing current to flow to the load.
Question 5 of 10
What is the function of the spring in a relay?
The spring provides the restoring force to move the armature back to its initial state when the coil is de-energized.
Question 6 of 10
What does 'NO' stand for in the context of relay contacts?
NO stands for Normally Open, meaning the contact is open when the relay is de-energized.
Question 7 of 10
What is the benefit of electrical isolation provided by relays?
Electrical isolation protects the low-voltage control circuit from the high voltages used by the load.
Question 8 of 10
What type of device is the control coil of a relay?
When current flows through the coil, it creates a magnetic field, acting like an electromagnet.
Question 9 of 10
What happens to the armature when the control signal is removed?
The spring returns the armature to its original position, de-energizing the load circuit.
Question 10 of 10
Relays are commonly used in which of the following applications?
Relays have broad applications in electrical systems, including motor control, appliances, and protective circuits.
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