Electronics - Operational Amplifiers

Exercise :: Operational Amplifiers - Filling the Blanks

6. 

An op-amp circuit in which the output voltage is equal to the difference between the two input voltages is called a(n) _____

A. integrator
B. differentiator
C. differential amplifier
D. voltage regulator

Answer: Option C

Explanation:

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7. 

fbq18_1007.gif

The feedback resistor has a value of ______ in the given circuit

A. 2 komega.gif
B. 10.5 komega.gif
C. 21 komega.gif
D. 40 komega.gif

Answer: Option D

Explanation:

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8. 

fbq18_1012.gif

The input impedance is ______ for the amplifier in the given circuit. The data sheet values are Zin = 3 Momega.gif, Zout = 80 omega.gif, and Aol = 250,000.

A. 4.7 komega.gif
B. 22.7 komega.gif
C. 3 Momega.gif
D. 68.6 komega.gif

Answer: Option A

Explanation:

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9. 

The Q of a crystal _________.

A. is extremely low
B. is about 40 or so in most cases
C. is extremely high
D. none of the above

Answer: Option C

Explanation:

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10. 

The 555 timer can be connected to operate a(n) ___________.

A. astable multivibrator
B. bistable multivibrator
C. monostable multivibrator
D. astable multivibrator and a monostable multivibrator

Answer: Option D

Explanation:

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