Mechanical Aptitude Mechanical Aptitude Basic Electrical Circuits 4

Question 1

Which type of circuit breaker characteristic makes it suitable for protecting motors against startup current surges?

Accepted Answer

Time-delay (slow-blow) breaker

Answer

Time-delay breakers tolerate brief current surges like motor startup without tripping, while still protecting against sustained overloads.

Question 2

In a parallel circuit with a 24V source and two resistors (6 ohms and 12 ohms), what is the total current from the source?

Accepted Answer

6 amps

Answer

Current through 6Ω = 24/6 = 4A; current through 12Ω = 24/12 = 2A; total = 4 + 2 = 6 amps.

Question 3

What does a 'ground' connection in an electrical circuit primarily provide?

Accepted Answer

A safe return path and protection against shock

Answer

Grounding provides a low-resistance path to earth that protects people from electrical shock if insulation fails.

Question 4

How much energy (in watt-hours) does a 100-watt light bulb consume if left on for 8 hours?

Accepted Answer

800 watt-hours

Answer

Energy = Power × Time = 100W × 8h = 800 watt-hours.

Question 5

What is the function of a capacitor in an electrical circuit?

Accepted Answer

It stores and releases electrical energy

Answer

A capacitor stores electrical energy in an electric field between two conductive plates and can release that energy back into the circuit.

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