# Electronics - Operational Amplifiers

### Exercise :: Operational Amplifiers - General Questions

16.

How many leads does the TO-5 metal can package of an operational amplifier have?

 A. 8, 10, or 12 B. 6, 8, or 10 C. 8 or 14 D. 8 or 16

Explanation:

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17.

If a noninverting amplifier has an RIN of 1000 ohms and an RFB of 2.5 kilohms, what is the RIN voltage when 1.42 mV is applied to the correct input?

 A. 3.5 mV B. ground C. 1.42 mV D. 0.56 mV

Explanation:

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18.

Input impedance [Zin(I)] of an inverting amplifier is approximately equal to:

 A. Ri B. Rf + Ri C. ∞ D. Rf – Ri

Explanation:

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19.

The closed-loop voltage gain of an inverting amplifier equals:

 A. the ratio of the input resistance to the feedback resistance B. the open-loop voltage gain C. the feedback resistance divided by the input resistance D. the input resistance

Explanation:

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20.

What is the cutoff frequency of this low-pass filter? A. 4.8 kHz B. 3.8 kHz C. 2.8 kHz D. 1.8 kHz