ASVAB Electronics Information Practice Test 313548 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.45
Score	0%	69%

Review

1 How would you connect 8 [12V 15A] batteries to achieve a combined power output of 12V 120A?

52% Answer Correctly

	orthogonal
	series
	parallel
	series-parallel

Solution

Connecting the 8 batteries in series multiplies their voltage while keeping their current the same yielding a 96V 15A configuration. Connecting the 8 batteries in parallel multiplies their current while keeping their voltage the same yieleding a 12V 120A configuration. Using a series-parallel connection, 4 batteries can be connected in series and 4 can be connected in parallel resulting in a 48V 60A configuration.

Which of the following statements about a capacitor is false?

77% Answer Correctly

	to discharge a capacitor safely, use a high-wattage resistor comparable to the capacitance of the capacitor
	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
	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 is a difference between a circuit breaker and a fuse?

80% Answer Correctly

	a fuse is cheaper than a circuit breaker
	all of these
	a circuit breaker can be reused
	a fuse responds more quickly than a circuit breaker

Solution

Like fuses, circuit breakers stop current flow once it reaches a certain amount. They have the advantage of being reusable (fuses must be replaced when "blown") but respond more slowly to current surges and are more expensive than fuses.

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

82% Answer Correctly

	1800 W
	600 W
	603 W
	601.5 W

Solution

Wattage is current multiplied by voltage: W = IV. So, the maximum amount of power a 120-volt circuit with a 5A circuit breaker would allow is 120V x 5A = 600 W.

The sum of the voltage drops across each resistor in a __________ circuit will equal the total voltage applied to the circuit.

54% Answer Correctly

	series-parallel
	parallel
	closed
	series

Solution

A series circuit has only one path for current to flow. In a series circuit, current (I) is the same throughout the circuit and is equal to the total voltage (V) applied to the circuit divided by the total resistance (R) of the loads in the circuit. The sum of the voltage drops across each resistor in the circuit will equal the total voltage applied to the circuit.