Electronics - Bipolar Junction Transistors (BJT)

Exercise :: Bipolar Junction Transistors (BJT) - Filling the Blanks

1. 

The input resistance of the base of an emitter-follower is usually _________.

A. very low
B. very high
C. shorted to ground
D. open

Answer: Option B

Explanation:

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2. 

The phase difference between the input and output ac voltage signals of a common-emitter amplifier is __________.

A.
B. 90º
C. 180º
D. 360º

Answer: Option C

Explanation:

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3. 

Base bias provides _________.

A. a very stable Q point
B. a very unstable Q point
C. no current gain
D. zero current in the base and collector circuits

Answer: Option B

Explanation:

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4. 

VCE approximately equals ________ when a transistor switch is cut off.

A. VCC
B. VB
C. 0.2 V
D. 0.7 V

Answer: Option A

Explanation:

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5. 

The input resistance, Rin of a common-collector amplifier, consists of ____________.

A. Rin = RE × AC Current Gain
B. fba12_1009b1.gif
C. Rin = RE × alpha.gif
D. none of the above

Answer: Option A

Explanation:

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