ASVAB Electronics Practice Test 3

Question 1

A transformer has a primary coil with 500 turns and a secondary coil with 100 turns. If the primary voltage is 220V, what is the secondary voltage?

Accepted Answer

44V

Answer

1,100V

Answer

22V

Answer

440V

Question 2

In a parallel circuit, three resistors have values of 6Ω, 12Ω, and 4Ω. What is the total resistance?

Accepted Answer

2Ω

Answer

22Ω

Answer

7.33Ω

Answer

1.5Ω

Question 3

What does a diode primarily do in an electrical circuit?

Accepted Answer

Allows current to flow in one direction only

Answer

Amplifies voltage signals

Answer

Stores electrical charge

Answer

Converts AC to a stable DC voltage

Question 4

A capacitor with a capacitance of 50 microfarads (µF) is fully charged to 12V. What charge (in microcoulombs) is stored on the capacitor?

Accepted Answer

600 µC

Answer

4.17 µC

Answer

62 µC

Answer

0.24 µC

Question 5

What is the primary difference between NPN and PNP transistors?

Accepted Answer

In NPN, current flows from collector to emitter; in PNP, from emitter to collector

Answer

NPN uses AC; PNP uses DC

Answer

NPN amplifies voltage; PNP amplifies current

Answer

NPN has three terminals; PNP has two terminals

Question 6

If a circuit has a voltage of 120V and a resistance of 30Ω, what is the power dissipated?

Accepted Answer

480W

Answer

4W

Answer

3,600W

Answer

360W