Q.1

The mimicking of an open/closed switch by a diode allows alternating current to be:

  • rectified
  • regulated
  • controlled
  • attenuated
Q.2

Testing a good diode with an ohmmeter should indicate

  • high resistance when forward or reverse biased
  • low resistance when forward or reverse biased
  • high resistance when reverse biased and low resistance when forward biased
  • high resistance when forward biased and low resistance when reverse biased
Q.3

The area at the junction of p-type and n-type materials that has lost its majority carriers is called the

  • barrier potential
  • depletion region
  • n region
  • p region
Q.4

The diode schematic arrow points to the:

  • trivalent-doped material
  • positive axial lead
  • anode lead
  • cathode lead
Q.5

Which type of transformer is required to create a 180 degree input to a rectifier?

  • center-tapped secondary
  • step-down secondary
  • stepped-up secondary
  • split winding primary
Q.6

Reverse biasing a pn junction allows the flow of majority current.

  • True
  • False
Q.7

The barrier potential is the small difference of potential created by positive and negative ions on either side of the depletion region.

  • True
  • False
Q.8

The voltage where current may start to flow in a reverse-biased pn junction is called the

  • breakdown voltage
  • barrier potential
  • forward voltage
  • biasing voltage
Q.9

The peak inverse voltage (PIV) across a nonconducting diode in a bridge rectifier equals approximately:

  • half the peak secondary voltage
  • twice the peak secondary voltage
  • the peak value of the secondary voltage
  • four times the peak value of the secondary voltage
Q.10

DC power should be connected to forward bias a diode as follows:

  • – anode, + cathode
  • – cathode, – anode
  • + anode, – cathode
  • + cathode, + anode
Q.11

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

  • crystal
  • chemical
  • electrical
  • covalent
Q.12

When checking a diode, low resistance readings both ways indicate the diode is:

  • open
  • satisfactory
  • faulty
  • not the problem
Q.13

What circuit activity may shift a characteristic curve so that diode operating points are different?

  • higher power (heat)
  • higher resistance
  • lower voltage
  • lower current
Q.14

A zener diode can be tested with an ohmmeter.

  • True
  • False
Q.15

A diode can be tested with an ohmmeter.

  • True
  • False
Q.16

Dark current is a small reverse current that flows in a photodiode that is receiving no light.

  • True
  • False
Q.17

Thermal shutdown occurs in an IC regulator if:

  • power dissipation is too high
  • internal temperature is too high
  • current through the device is too high
  • load resistance increases
Q.18

At any given time in an intrinsic piece of semiconductor material at room temperature

  • electrons drift randomly
  • recombination occurs
  • holes are created
  • All of the above
Q.19

The dc current through each diode in a bridge rectifier equals:

  • the load current
  • half the dc load current
  • twice the dc load current
  • one-fourth the dc load current
Q.20

A zener diode has a larger breakdown voltage than a diode.

  • True
  • False
0 h : 0 m : 1 s