Electronics Information Overview for ASVAB Power Practice Problems

These electronics information practice questions are based on the actual ASVAB. Take this quiz to see how you would do if you took the exam today and to determine your strengths and weaknesses as you plan your study schedule.

Time: 9 minutes

1. For safety purposes, electrical devices need to be
   1. inspected daily.
   2. limited in volt and amperage.
   3. grounded to prevent electrical shock.
   4. designed under international guidelines.
2. What is the frequency of the alternating voltage and current typically used in the United States?
   1. 20 Hz
   2. 40 Hz
   3. 60 Hz
   4. 110 Hz
3. If resistors R1, R2, and R3 are all rated at 500 ohms, what is the total resistance?



1. 500 watts
2. 500 ohms
3. 1,500 ohms
4. 1,500 watts
4. Putting metal in a microwave while it is operating should be avoided because
   1. it can melt.
   2. parts of the microwave can be damaged by reflected energy.
   3. it could cause a reverse polarity of the structural wiring system.
   4. none of the above
5. What is the total current in a parallel resistance circuit with three parallel paths that each have four amperes flowing through them?
   1. 2 A
   2. 12 A
   3. 4 A
   4. 8 A
6. The abbreviation FM stands for
   1. frequency modulation.
   2. frequency multiplier.
   3. feedback multiplex.
   4. farad magnet.
7. What does this electronic circuit symbol depict?



1. a conversion from AC to DC power
2. an electrical surge
3. a wire that does not join another
4. a wire that intersects another
8. A volt is a unit of electric(al)
   1. potential.
   2. energy.
   3. pressure.
   4. current.
9. Coulomb's law describes
   1. electromagnetic fields and their association with the electric grid.
   2. the relationship between direct current (DC) and alternating current (AC).
   3. the electrostatic force between electric charges.
   4. the electrical differential between resistors.
10. Total resistance in this schematic is 25 Ω. What is the voltage drop across R1?



1. 6.2 V
2. 12.4 V
3. 19.2 V
4. 48 V
11. If a vacuum cleaner is rated at 1,200 watts and operates at 120 volts, how much current will it draw?
    1. 10 amps
    2. 100 amps
    3. 120 amps
    4. 144,000 amps
12. The term given to a unit of electromotive force is a(n)
    1. ohm.
    2. amp.
    3. megawatt.
    4. volt.
13. The best antenna to use when working with frequencies below 300kHz would be a
    1. parabolic antenna.
    2. loopstick antenna.
    3. dish antenna.
    4. wire hanger antenna.
14. Which of the following is an advantage of a corner reflector antenna?
    1. broad spectrum capability
    2. its wireless design
    3. low power out
    4. increased directivity
15. In a directional antenna, what is the correlation between the diameter of a reflector in wave lengths and the gain?
    1. the smaller the diameter, the narrower the lobe
    2. the smaller the diameter, the greater the gain
    3. the larger the diameter, the greater the gain
    4. none of the above
16. In series circuit A, a 10Ω load dissipates 1 watt. In series circuit B, a 10Ω load dissipates 2 watts. What can be said about the current through the load in circuit A if the voltages in both circuits are equal?
    1. The current through load A is equal to the current through load B.
    2. The current through load A is twice the current through load B.
    3. The current through load A is half the current through load B.
    4. The current through load A is zero.
17. What type of antenna is this?



1. a corner reflector
2. a horn
3. a dish
4. a helical
18. FM radio broadcasting, amateur radio, broadcast television, and commercial aircraft transmit on what radio frequency?
    1. low frequency (LF)
    2. medium frequency (MF)
    3. very high frequency (VHF)
    4. ultra high frequency (UHF)
19. What is the purpose of a tuning capacitor?
    1. It allows an antenna to transmit.
    2. It is used to vary the time period.
    3. It adjusts the resonant frequency.
    4. none of the above
20. A transformer changes which of the following?
    1. power and pressure
    2. voltage and amperage
    3. voltage and current
    4. chemical energy