ASVAB Electronics Information Practice Test 678261 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.72
Score	0%	74%

Review

Which of the following allows current to pass easily in one direction and blocks current in the other direction?

69% Answer Correctly

	diode
	inductor
	capacitor
	resistor

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.

2 How would you connect 8 [15V 25A] batteries to achieve a combined power output of 60V 100A?

66% Answer Correctly

	orthogonal
	series-parallel
	parallel
	perpendicular

Solution

Connecting the 8 batteries in series multiplies their voltage while keeping their current the same yielding a 120V 25A configuration. Connecting the 8 batteries in parallel multiplies their current while keeping their voltage the same yieleding a 15V 200A configuration. Using a series-parallel connection, 4 batteries can be connected in series and 4 can be connected in parallel resulting in a 60V 100A configuration.

Which of the following statements about a capacitor is false?

77% Answer Correctly

	you should always discharge any capacitors before working on an electronic circuit
	it is safe to touch a capacitor with your hands as long as it is small
	to discharge a capacitor safely, use a high-wattage resistor comparable to the capacitance of the capacitor
	a capacitor remains charged even after the input voltage is removed

Solution

The purpose of a capacitor is to retain electric charge and it will do so even after its input voltage is removed. After the input voltage is removed, the capacitor will slowly discharge but, depending on the size and characteristics of the capacitor, discharging could take from a few minutes to a few years. So, it's never safe to touch a capacitor with your hands and you should make sure to discharge any capacitors in a circuit before working on it using an appropriately high-wattage resistor or a capacitor discharge tool.

Which of the following statements about electrical resistance is true?

75% Answer Correctly

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

Solution

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

5 A circuit with a 120-volt power supply is protected by a 25-amp circuit breaker. What is the largest number of watts loads on this circuit can safely use?

84% Answer Correctly

	1500 W
	3000 W
	3002 W
	4500 W

Solution

Wattage is current multiplied by voltage: W = IV. So, the maximum amount of power a 120-volt circuit with a 25A circuit breaker would allow is 120V x 25A = 3000 W.