ASVAB Electronics Information Practice Test 777095 Results

Your Results Global Average
Questions 5 5
Correct 0 3.68
Score 0% 74%

Review

1

What type of current flows in only one direction in a circuit?

82% Answer Correctly

alternating

parallel

direct

series
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 direct current (DC) is a battery.

2 A circuit with a 120-volt power supply is protected by a 15-amp circuit breaker. What is the largest number of watts loads on this circuit can safely use?
82% Answer Correctly
1802 W
900 W
3600 W
1800 W
Solution
Wattage is current multiplied by voltage: W = IV. So, the maximum amount of power a 120-volt circuit with a 15A circuit breaker would allow is 120V x 15A = 1800 W.
3

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

67% Answer Correctly

wrap the wire around a ceramic core

construct the wire from insulative material

wind the wire into a coil

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.

4

Which of the following allows current to pass easily in one direction and blocks current in the other direction?

69% Answer Correctly

inductor

diode

capacitor

resistor
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.

5 How would you connect 8 [15V 5A] batteries to achieve a combined power output of 60V 20A?
66% Answer Correctly
parallel
series-parallel
perpendicular
orthogonal
Solution

Connecting the 8 batteries in series multiplies their voltage while keeping their current the same yielding a 120V 5A configuration. Connecting the 8 batteries in parallel multiplies their current while keeping their voltage the same yieleding a 15V 40A configuration. Using a series-parallel connection, 4 batteries can be connected in series and 4 can be connected in parallel resulting in a 60V 20A configuration.