Q.1

A reverse biased diode will act as an open switch.

  • True
  • False
Q.2

The small amount of ac signal present on the output of a filtering network for a dc power supply is known as ________.

  • pulsating dc
  • trickle
  • ripple
  • waffle
Q.3

In a diode schematic, the anode is represented by a(n):

  • triangle
  • vertical line
  • zig-zag line
  • element indicator
Q.4

When matching polarity connections have been made and the potential difference (PD) is above 0.7 V, the diode is considered to be:

  • not working
  • forward biased
  • reverse biased
  • an open switch
Q.5

If the diode in a series circuit is reverse biased, the resistor will drop all the applied voltage.

  • True
  • False
Q.6

The PIV rating of a diode in a full-wave bridge rectifier is more than that required for a full-wave center-tapped configuration.

  • True
  • False
Q.7

An IC regulator receives an overload; it will:

  • shut down
  • compensate for heat
  • provide more voltage
  • sample and adjust
Q.8

With full-wave rectification, current through the load resistor must be:

  • in opposite directions
  • to the external load
  • from the reverse biased diode
  • in the same direction
Q.9

In a power supply diagram, which block indicates a smooth dc output?

  • transformer
  • filter
  • rectifier
  • regulator
Q.10

If a 169.7 V half-wave peak has an average voltage of 54 V, what is the average of two full-wave peaks?

  • 119.9 V
  • 108.0 V
  • 115.7 V
  • 339.4 V
Q.11

The troubleshooting process for a typical dc power supply contains four steps.

  • True
  • False
Q.12

An electron can move to another atom's orbit only while in the _______.

  • valence band
  • conduction band
  • orbit nearest the nucleus
  • covalent band
Q.13

A characteristic curve is the result of a current versus voltage plot of diode activity, which begins at the:

  • 3rd quadrant
  • current plot
  • graph origin
  • voltage plot
Q.14

The number of electrons in a stable atom is the same as the number of protons in its nucleus.

  • True
  • False
Q.15

Rectifier output polarity depends upon:

  • cycles of input
  • capacitor polarity
  • half or full wave
  • diode installation
Q.16

The characteristic curve for the complex model of a silicon diode shows that

  • the barrier potential is 0 V
  • the barrier potential stays fixed at 0.7 V
  • the barrier potential increases slightly with an increase in current
  • the barrier potential decreases slightly with an increase in current
Q.17

What is the percent of regulation if Vnl = 20 V and Vfl = 19.8 V?

  • 0%
  • 1%
  • .1%
  • 5%
Q.18

fbq16_1001_1.gif
Atoms in a silicon crystal are held together by ___ bonds.

  • crystal
  • chemical
  • electrical
  • covalent
Q.19

With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle?

  • 0 degrees
  • 90 degrees
  • 180 degrees
  • 360 degrees
Q.20

Electrons in the outermost orbit or shell of an atom are called

  • free electrons
  • negative ions
  • valence electrons
  • conduction band electrons
0 h : 0 m : 1 s