ASVAB Electronics Information Practice Test 967463 Results

Your Results Global Average
Questions 5 5
Correct 0 3.33
Score 0% 67%

Review

1 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?
82% Answer Correctly
3003 W
3300 W
3000 W
9000 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.
2

In metals, increasing the temperature typically _____________ conductivity.

50% Answer Correctly

decreases

increases

does nothing to

eliminates
Solution

All conductors have resistance and the amount of resistance varies with the element. Metals exhibit increased resistance (and, therefore, lower conductivity) as their temperature increases.

3

The valence shell of n insulator is how full of electrons?

56% Answer Correctly

empty

half full

more than half full

less than half full
Solution

Insulators have valence shells that are more than half full of electrons and, as such, are tightly bound to the nucleus and difficult to move from one atom to another.

4

One of the lights on your Christmas tree burns out and this causes the rest of the lights connected to that strand to go dark. How are the lights in that strand connected?

73% Answer Correctly

series-parallel

perpendicular

series

parallel
Solution

Lights connected in series form a chain with each light connecting to adjacent lights via one wire. Therefore, if one of the lights burns out and breaks the series, none of the other lights will receive power and they'll go dark. Lights connected in parallel each connect to the positive and negative nodes of the power source and would not go dark if one of their neighbors burnt out.

5

This circuit component symbol represents a(n):

72% Answer Correctly

capacitor

resistor

potentiometer

inductor
Solution

Resistors are used to limit voltage and/or current in a circuit and can have a fixed or variable resistance.  Variable resistors (often called potentiometers or rheostats) are used when dynamic control over the voltage/current in a circuit is needed, for example, in a light dimmer or volume control.