Free ETO Electrical Systems Operation & Maintenance Questions and Answers

Question 1

What is the primary function of a circuit breaker in electrical systems?

Accepted Answer

To protect circuits from overload

Answer

To increase voltage

Answer

To convert AC to DC

Answer

To measure current

Question 2

Which component is used to step down voltage in electrical distribution systems?

Accepted Answer

Transformer

Answer

Generator

Answer

Capacitor

Answer

Circuit breaker

Question 3

What is the typical purpose of a grounding system in electrical equipment?

Accepted Answer

To prevent electrical shock

Answer

To provide a power source

Answer

To store electrical energy

Answer

To increase current

Question 4

Which device is used to measure electrical current?

Accepted Answer

Ammeter

Answer

Voltmeter

Answer

Ohmmeter

Answer

Wattmeter

Question 5

What is the primary role of an electrical relay?

Accepted Answer

To switch circuits using a low power signal

Answer

To amplify electrical signals

Answer

To store electrical charge

Answer

To convert AC to DC

Question 6

Which type of maintenance is performed to prevent equipment failure before it occurs?

Accepted Answer

Preventive maintenance

Answer

Corrective maintenance

Answer

Emergency maintenance

Answer

Deferred maintenance

Question 7

What is the purpose of insulation in electrical wiring?

Accepted Answer

To prevent current leakage

Answer

To increase voltage

Answer

To conduct electricity

Answer

To store electrical energy

Question 8

Which standard electrical color code is commonly used for grounding wires?

Accepted Answer

Green

Answer

Black

Answer

Red

Answer

Blue

Question 9

What does an ohmmeter measure?

Accepted Answer

Resistance

Answer

Voltage

Answer

Current

Answer

Power