ASVAB Electronics Information Practice Test 704646 Results

Your Results Global Average
Questions 5 5
Correct 0 2.60
Score 0% 52%

Review

1 How would you connect 8 [12V 15A] batteries to achieve a combined power output of 12V 120A?
51% Answer Correctly
perpendicular
series
parallel
orthogonal

Solution

Connecting the 8 batteries in series multiplies their voltage while keeping their current the same yielding a 96V 15A configuration. Connecting the 8 batteries in parallel multiplies their current while keeping their voltage the same yieleding a 12V 120A configuration. Using a series-parallel connection, 4 batteries can be connected in series and 4 can be connected in parallel resulting in a 48V 60A configuration.


2

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

49% Answer Correctly

a semiconductor's conductivity can be varied under an external electrical field

a semiconductor conducts current better than a conductor

materials to produce semiconductors are cheap and abundant

a semiconductor exhibits increased conductivity with increased temperatures


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.


3

A transistor works by allowing a small amount of current to control general current flow. Where is the small amount of current applied?

55% Answer Correctly

base

input

collector

emitter


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

In household electrical wiring, which color of insulation indicates the 'hot' wire?

50% Answer Correctly

green

red

black

white


Solution

In the NM cable used for wiring homes, each cable has three wires inside a sheath with each wire covered in a different color of insulation to indicate its type. The wire with the black insulation is the 'hot' wire, white is the neutral wire, and the ground wire is either covered in green insulation or left bare.


5

The sum of the voltage drops across each resistor in a __________ circuit will equal the total voltage applied to the circuit.

54% Answer Correctly

parallel

closed

series-parallel

series


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.