ASVAB Electronics Information Practice Test 174402 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.38
Score	0%	68%

Review

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

68% Answer Correctly

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

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.

This circuit component symbol represents a(n):

71% Answer Correctly

	transistor
	inductor
	capacitor
	diode

Solution

A diode allows current to pass easily in one direction and blocks current in the other direction. Diodes are commonly used for rectification which is the conversion of alternating current (AC) into direct current (DC). Because a diode only allows current flow in one direction, it will pass either the upper or lower half of AC waves (half-wave rectification) creating pulsating DC. Multiple diodes can be connected together to utilize both halves of the AC signal in full-wave rectification.

3 How would you connect 10 [12V 5A] batteries to achieve a combined power output of 60V 25A?

66% Answer Correctly

	perpendicular
	orthogonal
	parallel
	series-parallel

Solution

Connecting the 10 batteries in series multiplies their voltage while keeping their current the same yielding a 120V 5A configuration. Connecting the 10 batteries in parallel multiplies their current while keeping their voltage the same yieleding a 12V 50A configuration. Using a series-parallel connection, 5 batteries can be connected in series and 5 can be connected in parallel resulting in a 60V 25A configuration.

In metals, increasing the temperature typically _____________ conductivity.

50% Answer Correctly

	eliminates
	decreases
	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.

You would measure the amount of voltage between two points in a circuit with a(n):

83% Answer Correctly

	battery
	ammeter
	voltmeter
	reostat

Solution

Voltage (V) is the electrical potential difference between two points. A voltmeter is used to measure the voltage between two points in a circuit.