Q.1

One of the advantages of using transformer coupling in a half-wave rectifier is that it allows the ac source to be directly connected to the load.

  • True
  • False
Q.2

A zener diode can be used to provide voltage regulation in a power supply.

  • True
  • False
Q.3

The conduction band is closest to the valence band in

  • semiconductors
  • conductors
  • insulators
  • The distance is the same for all of the above.
Q.4

What is the current through the zener diode?

mcq11_1011_1.gif

  • 0 mA
  • 7 mA
  • 8.3 mA
  • 13 mA
Q.5

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.6

The conduction band is closest to the valence band in

  • semiconductors
  • conductors
  • insulators
  • The distance is the same for all of the above.
Q.7

What is the current through the zener diode?

mcq11_1011_1.gif

  • 0 mA
  • 7 mA
  • 8.3 mA
  • 13 mA
Q.8

The diode's characteristic curve shows that current increases when voltage increases.

  • True
  • False
Q.9

The positive lead of a diode is the cathode.

  • True
  • False
Q.10

If a bridge rectifier is used, it is not necessary to use a transformer.

  • True
  • False
Q.11

It is not possible to use a half-wave rectifier circuit without a transformer.

  • True
  • False
Q.12

Electrons in the conduction band are the only ones that are included in the electron current flow.

  • True
  • False
Q.13

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.14

Doping semiconductive material is the process of putting a small amount of pentavalent or trivalent atoms in with tetravalent atoms.

  • True
  • False
Q.15

The forward biased characteristics of a zener diode are the same as those of a diode.

  • True
  • False
Q.16

Breakdown voltage and peak inverse voltage are the same.

  • True
  • False
Q.17

Special diodes designed to conduct in the reverse direction are called _______________ diodes.

  • zener
  • varactor
  • LED
  • switching
Q.18

A common problem with rectifiers is open diodes.

  • True
  • False
Q.19

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.20

___ occurs when a pn junction is first formed.

  • Recombination
  • Covalent bonding
  • Crystallization
  • Breakdown
0 h : 0 m : 1 s