Control Circuits Quiz

What are the components that make up a simple control circuit?

• A supply component, a control component, and a load component

• A power source, a resistor, and a capacitor

• A transformer, a diode, and a switch

• A battery, a light bulb, and a wire

Which of the following is an example of an initiating device in a control circuit?

• A manual switch

• A light bulb

• A resistor

• A capacitor

What is the role of a load in a control circuit?

• To consume power

• To supply power

• To store energy

• To amplify signals

How does a control component function in a control circuit?

• It changes the connections in a circuit to control the load component

• It provides power to the circuit

• It stores electrical energy

• It amplifies electrical signals

What is the primary function of the metal plunger in a solenoid when current flows through the coil wire?

• It becomes a permanent magnet.

• It becomes a temporary magnet and assists in linear movement.

• It generates electrical energy.

• It acts as an insulator.

Why is a material with low retentivity chosen for the frame, plunger, and travel-stop in a solenoid?

• To ensure it remains magnetized after the current is switched off.

• To allow it to lose its magnetism quickly when the current is switched off.

• To increase the strength of the electromagnetic field.

• To reduce the cost of the solenoid.

Which of the following is NOT an application of solenoids?

• Signalling devices such as door chimes

• Pressure relief valve actuators

• Motor brake actuators

• Solar panels

What is the primary function of a relay in an electrical circuit?

• To generate electricity

• To store electrical energy

• To operate or control another device

• To convert AC to DC

How are relays typically operated?

• By manual switches only

• Electro-mechanically or using electronic solid state components

• By solar power

• By hydraulic systems

What happens to the contacts of a relay when it is in a de-energized state?

• They are in a closed position

• They are in their normal position

• They are in an energized state

• They are disconnected