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Electronic Devices - Operational Amplifiers

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Exercise

"Everything should be made as simple as possible, but not simpler."
- Albert Einstein
1. 

In which of the following are operational amplifiers (op-amps) used?

A. Oscillators
B. Filters
C. Instrumentation circuits
D. All of the above

2. 

Refer to this figure. If the value of R1 decreases, the voltage gain will ________ and the input impedance will ________.

A. increase, increase
B. increase, decrease
C. decrease, decrease
D. decrease, increase

3. 

Refer to this figure. The purpose of R3 is

A. for bias current compensation.
B. for input offset voltage compensation.
C. to set input impedance.
D. to set input impedance and voltage gain.

4. 

A voltage-follower amplifier comes to you for service. You find the voltage gain to be 5.5 and the input impedance 22 k. The probable fault in this amplifier, if any, is

A. the gain is too low for this type of amplifier.
B. the input impedance is too high for this amplifier.
C. nothing is wrong. The trouble must be somewhere else.
D. none of these.

5. 

For an op-amp having a slew rate SR = 5 V/ms, what is the maximum closed-loop voltage gain that can be used when the input signal varies by 0.2 V in 10 ms?

A. 150B. 200
C. 250D. 300




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