ASVAB Electronics Information Practice Test 204024 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.63
Score	0%	73%

Review

1 A circuit with a 120-volt power supply is protected by a 10-amp circuit breaker. What is the largest number of watts loads on this circuit can safely use?

82% Answer Correctly

	1200 W
	1080 W
	400 W
	1320 W

Solution

Wattage is current multiplied by voltage: W = IV. So, the maximum amount of power a 120-volt circuit with a 10A circuit breaker would allow is 120V x 10A = 1200 W.

Which of the following will increase the magnetic field produced by the electric current in a wire?

68% Answer Correctly

	wind the wire into a coil
	construct the wire from insulative material
	wrap the wire around a ceramic core
	construct the wire from conductive material

Solution

A moving electric current produces a magnetic field proportional to the amount of current flow. This magnetic field can be made stronger by winding the wire into a coil and further enhanced if done around an iron containing (ferrous) core.

The rate of flow of electrons per unit time is which of the following?

74% Answer Correctly

	voltage
	resistance
	conductance
	current

Solution

Current is the rate of flow of electrons per unit time and is measured in amperes (A). A coulomb (C) is the quantity of electricity conveyed in one second by a current of one ampere.

A capacitor is often used for which of the following purposes?

68% Answer Correctly

	to convert alternating current into direct current
	to allow a small amount of current to control a large amount of current
	to maintain power in a circuit when the primary power source is disconnected
	as a primary power source

Solution

Capacitors store electricity and are used in circuits as temporary batteries. Capacitors are charged by DC current (AC current passes through a capacitor) and that stored charge can later be dissipated into the circuit as needed. Capacitors are often used to maintain power within a system when it is disconnected from its primary power source or to smooth out or filter voltage within a circuit.

Using a fuse with a current rating higher than that required by a circuit:

70% Answer Correctly

	makes no difference
	makes the circuit less safe
	is required
	is recommended

Solution

A fuse is a type of low resistance resistor that stops current flow in a circuit in response to a larger than intended electric current flow. Using a fuse with a higher current rating than required by a circuit is less safe as it could potentially allow overcurrent and risk a fire or heat-related equipment damage.