Electronics - Operational Amplifiers

Exercise :: Operational Amplifiers - Filling the Blanks

16. 

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The voltage gain of the amplifier in the given circuit would increase if ______.

A. the feedback resistor was decreased in value
B. the input voltage was increased
C. the input resistor was increased in value
D. None of the above

Answer: Option D

Explanation:

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17. 

A virtual ground is a(n) ______ ground because this point is at zero volts.

A. ordinary
B. voltage
C. chassis
D. earth

Answer: Option B

Explanation:

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18. 

The resistors Rf and Ri in an op-amp circuit control ______ .

A. positive feedback and current gain
B. negative feedback and power gain
C. negative feedback and voltage gain
D. open and closed loop gain

Answer: Option C

Explanation:

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19. 

______ is NOT a characteristic of an ideal op-amp.

A. Infinite voltage gain
B. Minimum bandwidth
C. Infinite input impedance
D. Zero output impedance

Answer: Option B

Explanation:

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20. 

Current cannot flow to ground through a(n) ________.

A. mechanical ground
B. ac ground
C. virtual ground
D. virtual short

Answer: Option C

Explanation:

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