CDC 3E0X1 Vol 1 UNIT 2 URE

  1. what does the word electronics mean

    D. applications involving the control of electricity
  2. an electron is considered a free electron when it reaches the

    A. conduction band
  3. a positive mobile charge is considered

    B. hole
  4. excessive external heat appied to electronics components

    D. causes increased current flow
  5. which condition exist when you connect the negative battery lead to a cathode

    A. forward bias
  6. which device should only be used in DC ciruits

    D. electrolytic capacitors
  7. which of the following is another term for a diode

    D. PN junction
  8. which multimeter lead connection is used to read forward bias on a diode

    C. black to cathode
  9. what does the arrow in the semiconductor indicate

    A. direction of hole current
  10. what does a flat side or shorter lead on some LEDs indicate

    C. cathode
  11. what is a zener diode typically used for

    C. voltage regulation
  12. how are the electrode leads identified and labeled on a bipolar junction transistor

    C. emitter, cathode, gate
  13. which letter combinations are types of bipolar junction transitors

    D. NPN, PNP
  14. how many layers of semiconducting material does a silicon controlled rectifier (SCR) have?

    A. four
  15. how does the base of a transistor normally recieve its control voltage

    B. Voltage divider circuit
  16. how is the emitter base junction on a transitor connected

    C. forward Biased
  17. transistors can be connected in how many configurations

    A. three
  18. what controls the conduction time of a silicon controlled rectifier (SCR)

    B. gate current
  19. how do you turn off a silicon controlled rectifier (SCR) in a minimum amunt of time?

    A. apply reverse bias to the anode
  20. what is developed for logic gate circuits to determine signal output

    D. truth tables
  21. which of the following is not a logic gate

    D. STOP
  22. the two purposes of the load resistor of a half wave rectifier is to develop the output signal and to

    C. limit current flow to a safe level
  23. if the input freq. to a half wave rectifier is 120Hz, its output ripple is

    D. 120PPS
  24. a fullwave rectifier can be identified easily on a schematic bec it contains

    A. a center tapped transformer
  25. the breakdown rating for diodes is a full wave rectifier must be twice as great as the

    A. half wave rectifier diode
  26. what freq. is the output ripple of a bridge rectifier with an input freq. of 60Hz

    C. 120 PPS
  27. the output ripple freq. of a three phase bridge rectifier is how many times the input freq.

    D. six times
  28. the output of a three phase bridge rectifier is of low ampitude and requires

    B. very little filtering
  29. why does a ripple voltage exist in a circuit powered by a rectifier

    A. The rectifier supplies energy to the load in pulses
  30. an inductive (choke) input filter gives a lower output voltage than the capacitive input LC filter and also

    D. better voltge regulation
  31. which of there characteristics are one of the pi-type LC filter

    B. High output voltage and better voltage regulation
  32. in the common emitter configuration, the input is between the emitter and the base and the output is between the

    D. collector and emitter
  33. what does the positive alternation of an input signal to the base of an NPN transistor in a common emitter configuration cause

    C. an increase in base current
  34. the controlling element in a common base configuration is the

    C. emitter
  35. which gain characteristics of a common base transistor amplifier is less than one

    D. Current
  36. the process of returning a part of the output of an amplifier back to its input in such a manner that it cancels part of the input signal is known as

    D. degeneration
  37. input resistance to a common collector amplifier is high bec the emitter signal opposes the

    A. base signal
  38. what purpose does the zener diode in the electronic voltage regulator serve?

    B. sets reference voltage
  39. the output voltage of the electronic voltage regulator circuit

    B. can be adjusted to a specific value
  40. what frequencies, in hertz (Hz) are the most common for transmission of electrical power

    A. 50, 60, 400
  41. which instrument gives immediate qualitative infomation on the degree and type of distortion

    B. oscilloscope
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CDC 3E0X1 Vol 1 UNIT 2 URE