Mechanical Aptitude Mechanical Aptitude Basic Electrical Circuits Questions and Answers 2 — Questions and Answers
Question 1: In a parallel circuit with three identical resistors, what happens to the total resistance compared to a single resistor?
- It becomes one-third of a single resistor (Correct answer)
- It triples
- It stays the same
- It doubles
Correct answer: It becomes one-third of a single resistor
In a parallel circuit, the total resistance equals one resistor's value divided by the number of identical resistors.
Question 2: A 9-volt battery is connected to a 3-ohm resistor. What is the current flowing through the circuit?
- 3 amps (Correct answer)
- 6 amps
- 27 amps
- 0.33 amps
Correct answer: 3 amps
Using Ohm's Law (I = V/R), 9 volts divided by 3 ohms equals 3 amps.
Question 3: Which component stores electrical energy in an electric field?
- Capacitor (Correct answer)
- Inductor
- Resistor
- Transformer
Correct answer: Capacitor
A capacitor stores energy in an electric field between its two conductive plates separated by an insulator.
Question 4: What is the unit of measurement for electrical power?
- Watt (Correct answer)
- Volt
- Ampere
- Ohm
Correct answer: Watt
Electrical power is measured in watts, calculated by multiplying voltage by current.
Question 5: In a series circuit, if one light bulb burns out, what happens to the other bulbs?
- All other bulbs go out (Correct answer)
- The remaining bulbs get brighter
- Nothing changes
- The remaining bulbs dim slightly
Correct answer: All other bulbs go out
In a series circuit, all components share a single current path, so a break anywhere stops current flow to all components.
Question 6: What does a fuse do in an electrical circuit?
- Breaks the circuit when current exceeds a safe level (Correct answer)
- Increases voltage output
- Stores excess electrical charge
- Converts AC to DC power
Correct answer: Breaks the circuit when current exceeds a safe level
A fuse contains a thin wire that melts and breaks the circuit when excessive current flows through it, protecting the circuit from damage.
Mechanical Aptitude Mechanical Aptitude Basic Electrical Circuits Questions and Answers 2
In a parallel circuit with three identical resistors, what happens to the total resistance compared to a single resistor?