Mechanical Aptitude Mechanical Aptitude Basic Electrical Circuits 2

Question 1

In a parallel circuit with three branches, if one branch is opened (disconnected), what happens to current in the other two branches?

Accepted Answer

Current in the other branches stays the same

Answer

In a parallel circuit, each branch operates independently at the same voltage, so opening one branch does not affect current in the remaining branches.

Question 2

A resistor is color-coded with bands: yellow, violet, red, gold. What is its resistance value?

Accepted Answer

4,700 ohms ±5%

Answer

Yellow=4, violet=7, red=×100 multiplier gives 4,700 ohms, and gold indicates ±5% tolerance.

Question 3

Which device is used to measure electrical current in a circuit?

Accepted Answer

Ammeter

Answer

An ammeter measures current flow (in amperes) and must be connected in series with the circuit.

Question 4

What is the total resistance when a 10-ohm and a 40-ohm resistor are connected in parallel?

Accepted Answer

8 ohms

Answer

Using 1/R_total = 1/10 + 1/40 = 4/40 + 1/40 = 5/40, so R_total = 40/5 = 8 ohms.

Question 5

A 120V circuit has a 20A circuit breaker. What is the maximum power load this circuit can handle?

Accepted Answer

2,400 watts

Answer

Power = Voltage × Current = 120V × 20A = 2,400 watts maximum.

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Mechanical Aptitude Basic Electrical Circuits 2