HAM Technician T5

  1. Electrical current is measured in which of the following units?



    D.  Amperes
  2. Electrical power is measured in which of the following units?



    D.  Watts
  3. What is the name for the flow of electrons in an electric circuit?



    C.  Current
  4. What is the name for a current that flows only in one direction?



    D.  Direct current
  5. What is the electrical term for the electromotive force (EMF) that causes electron flow?



    C.  Voltage
  6. How much voltage does a mobile transceiver typically require?



    D.  About 12 volts
  7. Which of the following is a good electrical conductor?



    A.  Copper
  8. Which of the following is a good electrical insulator?



    C.  Glass
  9. What is the name for a current that reverses direction on a regular basis?



    D.  Alternating current
  10. Which term describes the rate at which electrical energy is used?



    B.  Power
  11. What is the unit of electromotive force?



    A.  The volt
  12. What describes the number of times per second that an alternating current makes a complete cycle?



    B.  Frequency
  13. In which type of circuit is current the same through all components?



    A.  Series
  14. In which type of circuit is voltage the same across all components?



    C.  Parallel
  15. How many milliamperes is 1.5 amperes?



    D.  1500 milliamperes
  16. What is another way to specify a radio signal frequency of 1,500,000 hertz?



    C.  1500 kHz
  17. How many volts are equal to one kilovolt?



    B.  One thousand volts
  18. How many volts are equal to one microvolt?



    D.  One one-millionth of a volt
  19. Which of the following is equal to 500 milliwatts?



    C.  0.5 watts
  20. If an ammeter calibrated in amperes is used to measure a 3000- milliampere current, what reading would it show?



    C.  3 amperes
  21. If a frequency display calibrated in megahertz shows a reading of 3.525 MHz, what would it show if it were calibrated in kilohertz?



    B.  3525 kHz
  22. How many microfarads are equal to 1,000,000 picofarads?



    A.  1 microfarad
  23. What is the approximate amount of change, measured in decibels (dB), of a power increase from 5 watts to 10 watts?



    C.  3 dB
  24. What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts?



    D.  -6 dB
  25. What is the amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts?



    B.  10 dB
  26. Which of the following frequencies is equal to 28,400 kHz?



    B.  28.400 MHz
  27. If a frequency display shows a reading of 2425 MHz, what frequency is that in GHz?



    C.  2.425 GHz
  28. What is the ability to store energy in an electric field called?



    C.  Capacitance
  29. What is the basic unit of capacitance?



    A.  The farad
  30. What is the ability to store energy in a magnetic field called?



    D.  Inductance
  31. What is the basic unit of inductance?



    A.  The henry
  32. What is the unit of frequency?



    A.  Hertz
  33. What does the abbreviation "RF" refer to?



    D.  Radio frequency signals of all types
  34. A radio wave is made up of what type of energy?



    A.  Electromagnetic
  35. What is the formula used to calculate electrical power in a DC circuit?



    B.  Power (P) equals voltage (E) multiplied by current (I)
  36. How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes?



    D.  138 watts
  37. How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes?



    C.  30 watts
  38. How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts?



    C.  10 amperes
  39. What is impedance?



    D.  A measure of the opposition to AC current flow in a circuit
  40. What is a unit of impedance?



    A.  Ohms
  41. What is the proper abbreviation for megahertz?



    A.  MHz
  42. What formula is used to calculate current in a circuit?



    D.  Current (I) equals voltage (E) divided by resistance (R)
  43. What formula is used to calculate voltage in a circuit?



    C.  Voltage (E) equals current (I) multiplied by resistance (R)
  44. What formula is used to calculate resistance in a circuit?



    A.  Resistance (R) equals voltage (E) divided by current (I)
  45. What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts?



    A.  30 ohms
  46. What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?



    B.  8 ohms
  47. What is the resistance of a circuit that draws 4 amperes from a 12-volt source?



    A.  3 ohms
  48. What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?



    A.  1.5 amperes
  49. What is the current through a 100-ohm resistor connected across 200 volts?



    B.  2 amperes
  50. What is the current through a 24-ohm resistor connected across 240 volts?



    A.  10 amperes
  51. What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?



    B.  1 volt
  52. What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?



    D.  10 volts
  53. What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?



    C.  20 volts
  54. What happens to current at the junction of two components in series?



    D.  It is unchanged
  55. What happens to current at the junction of two components in parallel?



    B.  It divides between them dependent on the value of the components
  56. What is the voltage across each of two components in series with a voltage source?



    B.  It is determined by the type and value of the components
  57. What is the voltage across each of two components in parallel with a voltage source?



    A.  The same voltage as the source
Author
dcbailo
ID
352968
Card Set
HAM Technician T5
Description
Subelement T5 - Electrical principles: math for electronics; electronic principles; Ohm's Law
Updated