ASVAB Electronics Information Practice Test 189284 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.65
Score	0%	73%

Review

The hertz is a unit of measurement for:

81% Answer Correctly

	power
	inductance
	frequency
	energy

Solution

The hertz is a unit of measurement for frequency.

2 What's the overall power consumption of a piece of equipment that is rated for 3 amps at 100 volts?

85% Answer Correctly

	900 W
	303 W
	302 W
	300 W

Solution

Power is measured in watts (W) and 1 watt equals 1 ampere multiplied by 1 volt: P = \( V \times I \). For this problem, the equipment is rated for 3 amps (I) at 100 volts (V) so the equation becomes P = \( 100 \times 3 \) = 300 W

A transformer utilizes an inductor to increase or decrease what in a circuit?

62% Answer Correctly

	resistance
	load
	voltage
	current

Solution

A transformer utilizes an inductor to increase or decrease the voltage in a circuit. AC flowing in a coil wrapped around an iron core magnetizes the core causing it to produce a magnetic field. This magnetic field generates a voltage in a nearby coil of wire and, depending on the number of turns in the wire of the primary (source) and secondary coils and their proximity, voltage is induced in the secondary coil.

Which of the following is a characteristic of batteries connected in parallel?

52% Answer Correctly

	total current equals the average of the individual battery currents
	one connection is made between each adjacent battery
	the positive terminal of one battery is connected to the negative terminal of the next
	total current equals the sum of the individual battery currents

Solution

You can multiply the voltage or the current supplied by individual batteries by connecting them together either in series or in parallel. The characteristics of batteries connected in parallel are that total voltage equals the average of the individual battery voltages, total current equals the sum of the individual battery currents, the positive terminal of one battery is connected to the positive terminal of the next, the negative terminal of one battery is connected to the negative terminal of the next, and two connections are made between each adjacent battery.

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
	a capacitor remains charged even after the input voltage is removed
	to discharge a capacitor safely, use a high-wattage resistor comparable to the capacitance of the capacitor

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.