ASVAB Electronics Information Practice Test 457093 Results

	Your Results	Global Average
Questions	5	5
Correct	0	2.98
Score	0%	60%

Review

The valence shell of a semiconductor is how full of electrons?

67% Answer Correctly

	more than half full
	half full
	less than half full
	empty

Solution

Semiconductors have valence shells that are exacly half full and can conduct electricity under some conditions but not others. This property makes them useful for the control of electrical current.

A capacitor is often used for which of the following purposes?

68% Answer Correctly

	to allow a small amount of current to control a large amount of current
	as a primary power source
	to maintain power in a circuit when the primary power source is disconnected
	to convert alternating current into direct current

Solution

Capacitors store electricity and are used in circuits as temporary batteries. Capacitors are charged by DC current (AC current passes through a capacitor) and that stored charge can later be dissipated into the circuit as needed. Capacitors are often used to maintain power within a system when it is disconnected from its primary power source or to smooth out or filter voltage within a circuit.

In electrical wiring, which of the following are proportional?

50% Answer Correctly

	the length of the wire and the amount of the current
	the diameter of the wire and the amount of the voltage
	the length of the wire and the amount of the voltage
	the diameter of the wire and the amount of the current

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.

Direct current flows from the __________ terminal of the voltage source to the __________ terminal.

62% Answer Correctly

	positive, negative
	negative, positive
	negative, negative
	positive, positive

Solution

Direct current flows in only one direction in a circuit, from the negative terminal of the voltage source to the positive. A common source of direct current (DC) is a battery.

5 How would you connect 10 [9V 15A] batteries to achieve a combined power output of 9V 150A?

52% Answer Correctly

	series
	parallel
	perpendicular
	orthogonal

Solution

Connecting the 10 batteries in series multiplies their voltage while keeping their current the same yielding a 90V 15A configuration. Connecting the 10 batteries in parallel multiplies their current while keeping their voltage the same yieleding a 9V 150A configuration. Using a series-parallel connection, 5 batteries can be connected in series and 5 can be connected in parallel resulting in a 45V 75A configuration.