Electronics Information Practice Set 1

  1. Select the best answer for each question. This practice set contains 16 questions, which is the number of Electronics Information questions you will see if you take the CAT-ASVAB.

  2. How much current will flow in a circuit that has 60 mV applied to a 15 KΩ resistance?
    1. 0.004 mA
    2. 0.9 A
    3. 4.0 A
    4. 900 A
  3. What voltage is required for 30 A to flow through a 60 kΩ resistance?
    1. 1,800 V
    2. 1.8 kV
    3. 18 kV
    4. 1.8 MV
  4. What is the current in the 20-ohm resistor?
    Image Missing
    1. amp
    2. 1 amp
    3. 30 amps
    4. 100 amps
  5. Given the image below, which shell is the valence shell in a copper atom?
    Image Missing
    1. the first
    2. the second
    3. the third
    4. the fourth
  6. Which is the collector in the transistor symbol below?
    Image Missing
    1. 1
    2. 2
    3. 3
    4. 4
  7. Current can be expressed in
    1. kilohms
    2. kilovolts
    3. milliamperes
    4. millivolts
  8. A circuit with flowing current in it can be assumed to be
    1. open
    2. closed
    3. short
    4. dead
  9. Which of the following symbols represents a polarized capacitor?
    1. Image Missing
    2. Image Missing
    3. Image Missing
    4. Image Missing
  10. When a P-type material is joined with an N-type material, what is created?
    1. a resistor
    2. a diode
    3. an inductor
    4. a capacitor
  11. How does direct current (DC) flow in a conductor?
    1. two ways
    2. conductors allow zero current flow
    3. one way
    4. in the opposite direction as alternating
      current (AC)
  12. Which switch, if flipped, would not close the circuit in the diagram shown?
    Image Missing
    1. S1
    2. S2
    3. S3
    4. S4
  13. Given a circuit with a single resistor, adding two more resistors to the circuit, both with the same resistance value as the original resistor, one in parallel with the original resistor, and one in series with them both, will cause the overall resistance to
    1. definitely increase
    2. definitely decrease
    3. stay the same
    4. either increase or decrease depending on wiring order
  14. Which of the following would not increase the rate of direct current flow, I, through a conductor?
    1. decreasing effective resistance via a variable resistor
    2. increasing voltage
    3. adding an inductor to the circuit (in series)
    4. adding a resistor to the circuit (in parallel)
  15. A circuit includes three 2 Ω resistors wired in parallel. What is their effective resistance?
    1. Ω
    2. Ω
    3. Ω
    4. 6 Ω
  16. Why is copper favored over other conducting materials like aluminum and silver?
    1. Copper has the lowest resistance.
    2. Copper has the highest resistance.
    3. Copper is inexpensive.
    4. Copper has low resistance relative to its cost.
  17. A 6 V battery is used to provide power to a flashlight whose 10 W light bulb is the only load in the circuit. What is the amount of current flow through the flashlight?
    1. 0.6 A
    2. 1.67 A
    3. 6 A
    4. 60 A

Electronics Information Practice Set 2

  1. Select the best answer for each question. This practice set contains 16 questions, which is the number of Electronics Information questions you will see if you take the CAT-ASVAB.

  2. A 2.5 V battery is used to power a cordless phone. An ammeter shows the current flow is 30 A through the phone when it is on. How much power does the phone use?

    1. 0.067 W
    2. 12 W
    3. 32.5 W
    4. 75 W

  3. A shop vac is plugged into a 120 V generator. Given a total current flow of 15 A, what must the total resistance of the vacuum cleaner be?

    1. 8 Ω
    2. 15 Ω
    3. 120 Ω
    4. 1800 Ω

  4. Two identical resistors are wired in parallel in a circuit. The voltage drop across these resistors is 18 volts, and the total current in the circuit is 6 amps. What is the resistance of either resistor?

    1. 1.5 Ω
    2. 3 Ω
    3. 6 Ω
    4. 9 Ω

  5. Which of the following is one of the reasons neighborhoods are connected to the power grid via electrical substations instead of being wired into long-distance power lines directly?

    1. The substations use special components to connect aluminum power lines to copper household wiring.
    2. The substation transforms direct current to alternating current for household use.
    3. The substation transforms alternating current to direct current for household use.
    4. The substation transforms the efficient high-voltage power coming off the lines to a safer, lower value for household use.

  6. A fixed resistor has a color band pattern of black, orange, orange. What is its resistance?

    1. 33 ohms
    2. 3000 ohms
    3. 30,000 ohms
    4. 33,000 ohms

  7. Given the following DC circuit, which has been open for some time, what will happen after the switch is closed?

    image
    1. The total current flow will be smaller when the lamp first lights, then increase dramatically.
    2. The lamp will light up brightly and then burn out.
    3. The countercurrent of the inductor will cause the closed switch to spontaneously open again.
    4. The power draw on the battery will be higher at first, then lower as the resistance decreases.

  8. A European traveler brings his hair dryer to the United States. The specifications on the small appliance say it draws 10 amps when on a standard household circuit, which is 220 volts in Europe. What will it draw if connected directly to a U.S. power source of 110 volts?

    1. 5 amps
    2. 10 amps
    3. 15 amps
    4. 20 amps

  9. A simple circuit with a 10-volt battery and a 4-ohm resistor has a current of 2.5 amps running through it. When a second resistor is added, the amperage drops to 2 amps. What was the other resistor, and how was it wired to the circuit?

    1. A 0.5-ohm resistor, wired in series
    2. A 0.5-ohm resistor, wired in parallel
    3. A 1-ohm resistor, wired in series
    4. A 1-ohm resistor, wired in parallel

  10. A portable air compressor converts electric energy to the potential energy of pressurized air. A mechanics student calculates the total energy of the pressurized air at about 800,000 J. If it took 400 seconds to fully pressurize the machine, what must be the electric power rating of the compressor?

    1. 400 W
    2. 2000 W
    3. 800,000 W
    4. 320,000,000 W

  11. Given a lamp wired in a simple AC household circuit, which of the following will cause the light to dim the most?

    1. A capacitor wired in parallel with the lamp
    2. An inductor wired in parallel with the lamp
    3. A capacitor wired in series with the lamp
    4. An inductor wired in series with the lamp

  12. In the circuit diagram pictured, where the two lamps have identical loads, what will be the effect of closing the switch?

    image
    1. L1 will light up and L2 will shut off; the power draw on the battery will be the same.
    2. L1 will light up and L2 will dim; the power draw on the battery will double.
    3. L1 will light up and L2 will remain at the same brightness; the power draw on the battery will stay the same.
    4. L1 will light up and L2 will remain at the same brightness; the power draw on the battery will double.

  13. A simple parallel circuit with resistances of 2.5 Ω and and 5.0 Ω, respectively, will have

    1. equal amounts of current through each resistor
    2. twice as much current in the 2.5 Ω resistor
    3. twice as much current in the 5.0 Ω resistor
    4. 100 percent of the current in the 2.5 Ω resistor

  14. Plugs are often differently shaped in different countries to prevent foreign electronics from drawing on an electric grid they weren’t designed for. What would happen if a device designed for a 150-volt source were forced into a plug providing 240 volts?

    1. The device would function normally, as current and resistance are constant within a device.
    2. The device might be weaker due to lower current.
    3. The device might burn out due to higher current.
    4. The device would function normally but waste more energy.

  15. Which one of the following circuit components will least affect the flow of an alternating current?

    1. image
    2. image
    3. image
    4. image

  16. In the wiring diagram below, the fuse is rated for 0.4 A. The lamps and resistor have the resistances given, and the fuse has no resistance. What will happen when the switch is closed?

    image
    1. Both lamps will stay lit.
    2. Both lamps will light briefly and go out.
    3. L1 only will stay lit.
    4. L2 only will stay lit.

  17. A technician wants to measure the total current in the circuit described in the wiring diagram shown. If she attaches ammeters just after the 10 Ω and 20 Ω resistors, the total current will be equal to

    image
    1. the sum of the values on each ammeter
    2. the value on either ammeter, since they’ll show the same value
    3. the difference in the values on the two ammeters
    4. the average of the values on the two ammeters