ASVAB Electronics Information Practice Test 646579 Results

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

Review

An amplifier is most similar in function to which of the following:

65% Answer Correctly

	step-up transformer
	step-down transformer
	transistor
	capacitor

Solution

An amplifier is a device that takes a small input signal and creates a larger output signal. This makes it most similar to a step-up transformer which takes a smaller input voltage and creates a larger output voltage.

In metals, increasing the temperature typically _____________ conductivity.

50% Answer Correctly

	increases
	does nothing to
	eliminates
	decreases

Solution

All conductors have resistance and the amount of resistance varies with the element. Metals exhibit increased resistance (and, therefore, lower conductivity) as their temperature increases.

The voltage output of a transformer primarily depends on which of the following?

57% Answer Correctly

	the conductor used for the wire in the coils
	the diameter of the wire in the coils
	the number of turns in the wire of the coils
	the diameter of the coils

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.

The valence shell of n insulator is how full of electrons?

56% Answer Correctly

	more than half full
	empty
	less than half full
	half full

Solution

Insulators have valence shells that are more than half full of electrons and, as such, are tightly bound to the nucleus and difficult to move from one atom to another.

Which of these materials is not a good conductor of electricity?

79% Answer Correctly

	copper
	tin
	gold
	air

Solution

All conductors have resistance and the amount of resistance varies with the element. In general, metals make the best conductors of electricity and non-metals make the worst conductors of electricity.