ASVAB Electronics Information Practice Test 627954 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.29
Score	0%	66%

Review

1 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?

85% Answer Correctly

	9000 W
	3000 W
	3300 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.

The hertz is a unit of measurement for:

81% Answer Correctly

	power
	frequency
	inductance
	energy

Solution

The hertz is a unit of measurement for frequency.

The most common circuit configuration is:

59% Answer Correctly

	series
	parallel
	series-parallel
	household

Solution

Circuits are not limited to only series or only parallel configurations. Most circuits contain a mix of series and parallel segments. A good example is a household circuit breaker. Electrical outlets in each section of the house are wired in parallel with the circuit breaker for that section wired in series making it easy to cut off electricity to the parallel parts of the circuit when needed.

This circuit component symbol represents a(n):

55% Answer Correctly

	transformer
	potentiometer
	inductor
	fuse

Solution

Resistors are used to limit voltage and/or current in a circuit and can have a fixed or variable resistance. Variable resistors (often called potentiometers or rheostats) are used when dynamic control over the voltage/current in a circuit is needed, for example, in a light dimmer or volume control.

Which of the following is not an advantage of semiconductors over conductors?

49% Answer Correctly

	materials to produce semiconductors are cheap and abundant
	a semiconductor conducts current better than a conductor
	a semiconductor exhibits increased conductivity with increased temperatures
	a semiconductor's conductivity can be varied under an external electrical field

Solution

A semiconductor is a material that has a limited ability to conduct electrical current with conductivity between that of an insulator and that of a conductor. Silicon, a cheap and abundant material, is the most used semiconductor material although other materials are used in the electronics components made from semiconductors. The primary advantages of a semiconductor over a conductor is that the conductivity of a semiconductor can be varied under an external electrical field giving engineers precise control over complex circuits and, unlike conductors like metals, a semiconductor's conductivity increases with increased temperatures.