ASVAB Electronics Information Practice Test 684191 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.07
Score	0%	61%

Review

1 What's the overall power consumption of a piece of equipment that is rated for 8 amps at 60 volts?

85% Answer Correctly

	480 W
	240 W
	528 W
	483 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 8 amps (I) at 60 volts (V) so the equation becomes P = \( 60 \times 8 \) = 480 W

What is the frequency of most household electrical systems?

60% Answer Correctly

	110Hz
	60MHz
	110V
	60Hz

Solution

Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances. Most households use electricity with a frequency of 60Hz.

Which of the following is not a characteristic of direct current?

48% Answer Correctly

	cannot easily travel distances without power loss
	electrons flow in only one consistent direction
	used to power your cell phone
	an example power source is a generator

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 DC is a battery. In contrast to the constant one-way flow of direct current, alternating current changes direction many times each second. Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances.

In an electronic circuit, a thermocouple can be used to:

42% Answer Correctly

	keep the circuit at a designated safe temperature
	link the temperature of one component in the circuit to that of another component in the circuit
	open or close a circuit at a designated temperature
	increase or decrease the temperature of a component in the circuit

Solution

A thermocouple is a temperature sensor that consists of two wires made from different conductors. The junction of these two wires produces a voltage based on the temperature difference between them and can be used like a switch to open or close the circuit at a designated temperature.

Which of the following allows DC to pass easily but resists the flow of AC?

56% Answer Correctly

	semiconductor
	capacitor
	inductor
	transformer

Solution

An inductor is coiled wire that stores electric energy in the form of magnetic energy and resists changes in the electric current flowing through it. If current is increasing, the inductor produces a voltage that slows the increase and, if current is decreasing, the magnetic energy in the coil opposes the decrease to keep the current flowing longer. In contrast to capacitors, inductors allow DC to pass easily but resist the flow of AC.