ASVAB Electronics Information Practice Test 731623 Results

Your Results Global Average
Questions 5 5
Correct 0 3.35
Score 0% 67%

Review

1

In electrical wiring, which of the following are proportional?

50% Answer Correctly

the diameter of the wire and the amount of the current

the length of the wire and the amount of the voltage

the length of the wire and the amount of the current

the diameter of the wire and the amount of the voltage
Solution

Current flow through a wire increases the temperature of the wire. If too small a wire is used, the wire will heat up causing a loss in conductivity and possibly a fire. The thicker in diameter a wire is, the more current it can carry without overheating.

2 Use Ohm's Law to calculate the value of resistance in this circuit if voltage is 10 volts and current is 0.5 amps.
80% Answer Correctly
23 Ω
18 Ω
20 Ω
60 Ω
Solution

Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.

Solved for resistance, R = \( \frac{V}{I} \) = \( \frac{10}{0.5} \) = 20 Ω

3

In metals, increasing the temperature typically _____________ conductivity.

50% Answer Correctly

decreases

eliminates

increases

does nothing to
Solution

All conductors have resistance and the amount of resistance varies with the element. Metals exhibit increased resistance (and, therefore, lower conductivity) as their temperature increases.

4 Use Ohm's Law to calculate the value of voltage in this circuit if resistance is 80 Ω and current is 5 amps.
85% Answer Correctly
360 V
402 V
400 V
403 V
Solution

Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.

V = \( I \times R \) = \( 5 \times 80 \) = 400 V

5

Which of the following will help to prevent a short circuit?

74% Answer Correctly

fuse

diode

resistor

transistor
Solution

Fuses are thin wires that melt when the current in a circuit exceeds a preset amount. They help prevent short circuits from damaging circuit components when an unusually large current is applied to the circuit, either through component failure or spikes in applied voltage.