Deck 49: The Unijunction Transistor

Question 1

Most UJTs should not be connected to capacitors larger than ____ microfarad(s).

A) 1
B) 10
C) 100
D) 1,000

Answer 1

B

Question 2

How can you control the pulse rate of the UJT?

Answer 2

By varying the resistance connected in series with the capacitor, the amount of time needed for charging the capacitor can be changed, thereby controlling the pulse rate of the UJT.

Question 3

When testing the UJT with an ohmmeter, the UJT will appear as a circuit containing two resistors connected in series, with a(n) ____________________ connected to the junction point of the two resistors.

Answer 3

diode

Question 4

The unijunction transistor is made by combining ____ layers of semiconductor material.

A) two
B) three
C) four
D) five

Question 5

The unijunction transistor (UJT) is a special transistor that has two bases and two emitters.

Question 6

What are some examples of thyristors?

Question 7

The pulse rate is determined by the amount of resistance and capacitance connected to the emitter of the UJT.

Question 8

____________________ are devices that are turned completely on or completely off.