ASVAB Electronics Information Practice Test 719500 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.03
Score	0%	61%

Review

This circuit component symbol represents a(n):

66% Answer Correctly

	DC source
	AC source
	transistor
	transformer

Solution

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.

2 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?

84% Answer Correctly

	3000 W
	4500 W
	2994 W
	6000 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.

Which of the following is not true about a line drop?

43% Answer Correctly

	it is caused by resistance
	it is addressed by raising current and lowering voltage across the ransmission line
	it is a decrease in voltage between two points on a line
	it is addressed by raising voltage and lowering current across the transmission line

Solution

Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances. A line drop is a decrease in voltage between two points on an electrical transmission line due to resistance in the line. A lower current and higher voltage across the line will help compensate for the line drop.

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

48% Answer Correctly

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

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.

What is the primary difference between a rectifier and an inverter?

61% Answer Correctly

	a rectifier converts an AC input to DC while an inverter converts a DC input to AC
	a rectifier strips out the AC portion of electricity while an inverter strips out the DC portion
	a rectifier converts a DC input to AC while an inverter converts an AC input to DC
	a rectifier strips out the DC portion of electricity while an inverter strips out the AC portion

Solution

A diode allows current to pass easily in one direction and blocks current in the other direction. Diodes are commonly used for rectification which is the conversion of alternating current (AC) into direct current (DC). Because a diode only allows current flow in one direction, it will pass either the upper or lower half of AC waves (half-wave rectification) creating pulsating DC. Multiple diodes can be connected together to utilize both halves of the AC signal in full-wave rectification.