ASVAB Electronics Information Practice Test 359088 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.47
Score	0%	69%

Review

Which of the following is a difference between a circuit breaker and a fuse?

80% Answer Correctly

	a fuse responds more quickly than a circuit breaker
	a fuse is cheaper than a circuit breaker
	all of these
	a circuit breaker can be reused

Solution

Like fuses, circuit breakers stop current flow once it reaches a certain amount. They have the advantage of being reusable (fuses must be replaced when "blown") but respond more slowly to current surges and are more expensive than fuses.

2 A circuit with a 120-volt power supply is protected by a 5-amp circuit breaker. What is the largest number of watts loads on this circuit can safely use?

82% Answer Correctly

	604 W
	601.5 W
	600 W
	603 W

Solution

Wattage is current multiplied by voltage: W = IV. So, the maximum amount of power a 120-volt circuit with a 5A circuit breaker would allow is 120V x 5A = 600 W.

General current flow in a transistor is from __________ to __________.

51% Answer Correctly

	collector, emitter
	base, emitter
	base, collector
	collector, base

Solution

The transistor is the foundation of modern electronic devices. It is made entirely from semiconductor material (making it a solid state device) and can serve many different functions in a circuit including acting as a switch, amplifier, or current regulator. A transistor works by allowing a small amount of current applied at the base to control general current flow from collector to emitter through the transistor.

4 Use Ohm's Law to calculate the value of current in this circuit if voltage is 280 volts and resistance is 40 Ω.

80% Answer Correctly

	10.5 A
	21 A
	7.7 A
	7 A

Solution

Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.

Solved for current, I = \( \frac{V}{R} \) = \( \frac{280}{40} \) = 7 A

Which of the following is a characteristic of batteries connected in parallel?

52% Answer Correctly

	total current equals the average of the individual battery currents
	total current equals the sum of the individual battery currents
	one connection is made between each adjacent battery
	the positive terminal of one battery is connected to the negative terminal of the next

Solution

You can multiply the voltage or the current supplied by individual batteries by connecting them together either in series or in parallel. The characteristics of batteries connected in parallel are that total voltage equals the average of the individual battery voltages, total current equals the sum of the individual battery currents, the positive terminal of one battery is connected to the positive terminal of the next, the negative terminal of one battery is connected to the negative terminal of the next, and two connections are made between each adjacent battery.