ASVAB Electronics Information Practice Test 878533 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.62
Score	0%	72%

Review

Which of the following statements about electrical resistance is true?

74% Answer Correctly

	electrically conductive materials have no resistive properties
	the more resistive the conductor is the slower electron flow will be
	the less resistive the conductor is the slower electron flow will be
	the more resistive the conductor is the faster electron flow will be

Solution

Resistance is opposition to the flow of current. As resistance increases, current decreases as resistance and current are inversely proportional.

2 A circuit with a 120-volt power supply is protected by a 20-amp circuit breaker. What is the largest number of watts loads on this circuit can safely use?

82% Answer Correctly

	7200 W
	2400 W
	2393 W
	2402 W

Solution

Wattage is current multiplied by voltage: W = IV. So, the maximum amount of power a 120-volt circuit with a 20A circuit breaker would allow is 120V x 20A = 2400 W.

The conductivity of an element depends on how many electrons occupy which electron shell?

78% Answer Correctly

	first
	inner
	outer
	middle

Solution

All electricity is the movement of electrons which are subatomic particles that orbit the nucleus of an atom. Electrons occupy various energy levels called shells and how well an element enables the flow of electrons depends on how many electrons occupy its outer (valence) electron shell.

4 Suppose you have 8 [6V 20A] batteries that you can connect together in series, in parallel, or in series-parallel. Which of the following voltage and ampere combinations cannot be attained using these 8 batteries?

46% Answer Correctly

	8V 120A
	48V 20A
	24V 80A
	6V 160A

Solution

Connecting the 8 batteries in series multiplies their voltage while keeping their current the same yielding a 48V 20A configuration. Connecting the 8 batteries in parallel multiplies their current while keeping their voltage the same yielding a 6V 160A configuration. Using a series-parallel connection, 4 batteries can be connected in series and 4 can be connected in parallel resulting in a 24V 80A configuration.

Which of these materials is not a good conductor of electricity?

79% Answer Correctly

	tin
	copper
	gold
	air

Solution

All conductors have resistance and the amount of resistance varies with the element. In general, metals make the best conductors of electricity and non-metals make the worst conductors of electricity.