bipolar-junction-transistors-(bjt) electronics question and answers -Page 2

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Bipolar Junction Transistors (BJT) problems

1. Which is beta's current ratio?
Options
A. I_C/I_B
B. I_C/I_E
C. I_B/I_E
D. I_E/I_B

Correct Answer: I_C/I_B

2. When transistors are used in digital circuits they usually operate in the:
Options
A. active region
B. breakdown region
C. saturation and cutoff regions
D. linear region

Correct Answer: saturation and cutoff regions

3. Total emitter current is:
Options
A. I_E ? I_C
B. I_C + I_E
C. I_B + I_C
D. I_B ? I_C

Correct Answer: I_B + I_C

4. The input/output relationship of the common-collector and common-base amplifiers is:
Options
A. 270 degrees
B. 180 degrees
C. 90 degrees
D. 0 degrees

Correct Answer: 0 degrees

5. With the positive probe on an NPN base, an ohmmeter reading between the other transistor terminals should be:
Options
A. open
B. infinite
C. low resistance
D. high resistance

Correct Answer: low resistance

6. Three different Q points are shown on a dc load line. The upper Q point represents the:
Options
A. minimum current gain
B. intermediate current gain
C. maximum current gain
D. cutoff point

Correct Answer: maximum current gain

7. A current ratio of I_C/I_E is usually less than one and is called:
Options
A. beta
B. theta
C. alpha
D. omega

Correct Answer: alpha

8. Most of the electrons in the base of an NPN transistor flow:
Options
A. out of the base lead
B. into the collector
C. into the emitter
D. into the base supply

Correct Answer: into the collector

9. The symbol h_fe is the same as:
Options
A.
B.
C. hi-fi
D.

Correct Answer:

10. The C-B configuration is used to provide which type of gain?
Options
A. voltage
B. current
C. resistance
D. power

Correct Answer: voltage

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