ASVAB Electronics Information Practice Test 958251 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.44
Score	0%	69%

Review

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

67% Answer Correctly

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

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.

In a series circuit, which of the following is the same across all branches of the circuit?

61% Answer Correctly

	current
	conductance
	resistance
	voltage

Solution

A series circuit has only one path for current to flow. In a series circuit, current (I) is the same throughout the circuit and is equal to the total voltage (V) applied to the circuit divided by the total resistance (R) of the loads in the circuit. The sum of the voltage drops across each resistor in the circuit will equal the total voltage applied to the circuit.

You would measure the amount of resistance at a certain point in a circuit with a(n):

78% Answer Correctly

	potentiometer
	ohmmeter
	voltmeter
	ammeter

Solution

Resistance is opposition to the flow of current and is measured in ohms (Ω). An ohmmeter is used to measure the amount of resistance at a certain point in a circuit.

4 What's the overall power consumption of a piece of equipment that is rated for 2 amps at 70 volts?

80% Answer Correctly

	139 W
	420 W
	140 W
	46 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 2 amps (I) at 70 volts (V) so the equation becomes P = \( 70 \times 2 \) = 140 W

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

50% Answer Correctly

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

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.