Discussion
Home ‣ Electronics ‣ Bipolar Junction Transistors (BJT) Comments
- Question
The input resistance of the base of an emitter-follower is usually _________.
Options- A. very low
- B. very high
- C. shorted to ground
- D. open
- Correct Answer
- very high
- 1. The phase difference between the input and output ac voltage signals of a common-emitter amplifier is __________.
Options- A. 0º
- B. 90º
- C. 180º
- D. 360º Discuss
- 2. VCE approximately equals ________ when a transistor switch is cut off.
Options- A. VCC
- B. VB
- C. 0.2 V
- D. 0.7 V Discuss
- 3. An emitter-follower has a voltage gain that is __________.
Options- A. much less than one
- B. approximately equal to one
- C. greater than one
- D. zero Discuss
- 4. VCE approximately equals ________ when a transistor switch is in saturation.
Options- A. VC
- B. VB
- C. 0.3 V
- D. 0.7 V Discuss
- 5. The input resistance, Rin of a common-collector amplifier, consists of ____________.
Options- A. Rin = RE × AC Current Gain
- B.
- C. Rin = RE × ɑ
- D. none of the above Discuss
- 6. The silicon-controlled rectifier (SCR) is a three-layer device consisting of a gate, an anode, and a cathode.
Options- A. True
- B. False Discuss
- 7. A transducer does not convert energy from one form to another.
Options- A. True
- B. False Discuss
- 8. A TRIAC can be triggered or activated by either a positive or a negative input gate trigger.
Options- A. True
- B. False Discuss
- 9. A TRIAC will control AC voltage during the positive half cycle only.
Options- A. True
- B. False Discuss
- 10. The DIAC conducts in only one direction when gated on.
Options- A. True
- B. False Discuss
Bipolar Junction Transistors (BJT) problems
Search Results
Correct Answer: 180º
Correct Answer: VCC
Correct Answer: approximately equal to one
Correct Answer: 0.3 V
Correct Answer: Rin = RE × AC Current Gain
Correct Answer: False
Explanation:
A silicon-controlled rectifier (or semiconductor-controlled rectifier) is a four-layer solid state device that controls current. The name "silicon controlled rectifier" or SCR is General Electric's trade name for a type of thyristor. The SCR was developed by a team of power engineers led by Gordon Hall and commercialized by Frank W. "Bill" Gutzwiller in 1957.
Correct Answer: False
Correct Answer: True
Correct Answer: False
Correct Answer: False
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