Key Topic 25: Transistors-1

Question 1

3-25C1: What is the meaning of the term “alpha” with regard to bipolar transistors? The change of:

A. Collector current with respect to base current.
B. Base current with respect to collector current.
C. Collector current with respect to gate current.
D. Collector current with respect to emitter current.

Answer 1

D. Collector current with respect to emitter current.

Question 2

3-25C2: What are the three terminals of a bipolar transistor?

A. Cathode, plate, and grid.
B. Base, collector, and emitter.
C. Gate, source, and sink.
D. input, output, and ground.

Answer 2

B. Base, collector, and emitter.

Question 3

3-25C3: What is the meaning of the term “beta” with regard to bipolar transistors? The change of:

A. Base current with respect to emitter current.
B. Collector current with respect to emitter current.
C. Collector current with respect to base current.
D. Base current with respect to gate current.

Answer 3

C. Collector current with respect to base current.

Question 4

3-25C4: What are the elements of a unijunction transistor?

A. Base 1, base 2, and emitter.
B. Gate, cathode, and anode.
C. Gate, base 1, and base 2.
D. Gate, source, and sink.

Answer 4

A. Base 1, base 2, and emitter.

Question 5

3-25C5: The beta cutoff frequency of a bipolar transistor is the frequency at which:

A. Base current gain has increased to 0.707 of maximum.
B. Emitter current gain has decreased to 0.707 of maximum.
C. Collector current gain has decreased to 0.707.
D. Gate current gain has decreased to 0.707.

Answer 5

B. Emitter current gain has decreased to 0.707 of maximum.

Question 6

3-25C6: What does it mean for a transistor to be fully saturated?

A. The collector current is at its maximum value.
B. The collector current is at its minimum value.
C. The transistor’s Alpha is at its maximum value.
D. The transistor’s Beta is at its maximum value.

Answer 6

A. The collector current is at its maximum value.