Deck 45: The Pn Junction

Question 1

The PN junction is often called the ____________________.

Answer 1

diode

Question 2

The diode can be used to perform many jobs, but it is most commonly used in industry to construct a(n) ____________________.

Answer 2

rectifier

Question 3

How can the anode and the cathode of a diode be identified?

Answer 3

When the diode is to be connected in a circuit, there must be some means of identifying the anode and the cathode. Diodes are made in different case styles so there are different methods of identifying the leads. Large stud-mounted diodes often have the diode symbol printed on the case to show proper lead identification. Small plastic case diodes often have a line or band around one end of the case. This line or band represents the line in front of the arrow on the schematic symbol of the diode. An ohmmeter can always be used to determine the proper lead identification if the polarity of the ohmmeter leads is known. The positive lead of the ohmmeter must be connected to the anode to make the diode forward biased.

Question 4

How does a diode operate?

Question 5

____ diodes can be connected to form a three-phase bridge rectifier that will change three-phase AC voltage into DC voltage.

A) Two
B) Three
C) Four
D) Six

Question 6

The conventional current flow theory assumes that current flows from positive to negative.

Question 7

Diodes cannot be connected to produce full-wave rectification.

Question 8

Ground is generally considered to be ____ volts in an electronic circuit.

A) 0
B) 0.5
C) 1
D) 5