Mechanical Aptitude Mechanical Aptitude Basic Electrical Circuits 5

Question 1

A transformer has 200 turns on the primary coil and 50 turns on the secondary coil. If the primary voltage is 240V, what is the secondary voltage?

Accepted Answer

60 volts

Answer

V_secondary = V_primary × (N_secondary / N_primary) = 240 × (50/200) = 240 × 0.25 = 60 volts.

Question 2

Which instrument would you use to check whether a circuit is open or closed without energizing it?

Accepted Answer

Ohmmeter or continuity tester

Answer

An ohmmeter or continuity tester applies its own small voltage to measure resistance, detecting open (infinite resistance) or closed (low resistance) circuits safely.

Question 3

What is the difference between AC (alternating current) and DC (direct current)?

Accepted Answer

DC flows only in one direction; AC reverses direction periodically

Answer

DC flows continuously in one direction, while AC periodically reverses direction, typically at 60 Hz in the US.

Question 4

A wire carries 3 amps for 10 seconds. How many coulombs of charge have passed through it?

Accepted Answer

30 coulombs

Answer

Charge = Current × Time = 3A × 10s = 30 coulombs.

Question 5

What is electrical 'short circuit'?

Accepted Answer

An unintended low-resistance path that allows excess current to bypass the load

Answer

A short circuit creates a direct low-resistance path, causing extremely high current that can damage wiring and start fires.

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Mechanical Aptitude Basic Electrical Circuits 5