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The two basic ways of specifying input impedance of an op- amp are


A) differential and extremely high.
B) differential and common- mode.
C) differential and common- loop.
D) closed- loop and common- mode.

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There can be no current to ground through


A) a virtual ground.
B) an ordinary ground.
C) a mechanical ground.
D) an ac ground.

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A

The loop gain AOLB


A) may not equal 1.
B) is usually much smaller than 1.
C) is between 0 and 1.
D) is usually much greater than 1.

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The voltage gain of an op- amp is unity at the


A) unity- gain frequency.
B) cutoff frequency.
C) generator frequency.
D) power bandwidth.

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A

The closed- loop input impedance in a noninverting amplifier is


A) ideally zero.
B) sometimes less than the open- loop input impedance.
C) equal to the open- loop input impedance.
D) much greater than the open- loop input impedance.

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In an op- amp, the CMRR is limited mostly by the


A) gain- bandwidth product.
B) the common- mode gain of the op- amp.
C) tolerance of the resistors.
D) supply voltages.

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-Refer to the figure above. This op- amp has a slew rate of 1.33 V/µs. How long would it take the output voltage to change from - 12 V to +12 V? A) 36 µs B) 18 µs C) 48 µs D) 16 µs -Refer to the figure above. This op- amp has a slew rate of 1.33 V/µs. How long would it take the output voltage to change from - 12 V to +12 V?


A) 36 µs
B) 18 µs
C) 48 µs
D) 16 µs

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-Refer to the figure above. Which components are used to set input impedance and voltage gain? A) R4 B) R3 C) R3 and R4 D) R1 and R2 -Refer to the figure above. Which components are used to set input impedance and voltage gain?


A) R4
B) R3
C) R3 and R4
D) R1 and R2

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-Refer to the figure above. If these three circuits were connected as a multiple- stage amplifier, the total voltage gain would be A) 10. B) 21. C) 210. D) 1. -Refer to the figure above. If these three circuits were connected as a multiple- stage amplifier, the total voltage gain would be


A) 10.
B) 21.
C) 210.
D) 1.

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What is the value of compensating resistor needed for a noninverting op- amp circuit using 10 k▲ resistors for both RI and RF?


A) 100 k▲
B) 5 k▲
C) 20 k▲
D) 10 k▲

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B

-Refer to the figure above. Which components are used for bias current compensation? A) R2 B) R3 C) R4 D) R1 and R2 -Refer to the figure above. Which components are used for bias current compensation?


A) R2
B) R3
C) R4
D) R1 and R2

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The ideal op- amp has


A) infinite input impedance and zero output impedance.
B) infinite output impedance and zero input impedance.
C) infinite voltage gain and infinite bandwidth.
D) Both A and C.

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The closed- loop voltage gain of an inverting amplifier equals


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

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The feedback fraction "B"


A) may not equal 1.
B) is usually greater than 1.
C) may equal 1.
D) is always less than 1.

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-Refer to the figure above. Which circuit is a voltage follower? A) a) B) b) C) c) D) None of the above. -Refer to the figure above. Which circuit is a voltage follower?


A) a)
B) b)
C) c)
D) None of the above.

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The op- amp can amplify


A) dc signals only.
B) ac signals only.
C) both ac and dc signals.
D) neither ac nor dc signals.

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A voltage follower amplifier comes to you for service. With a sine wave input of 1 V, the output is squared off at approximately 30 V peak- to- peak. The most likely problem is


A) the input is shorted to ground.
B) open feedback loop.
C) the output is shorted to ground.
D) no dc supply voltage.

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-Refer to c) in the figure above. If an amplifier with an input impedance of 12 k▲ and the same voltage gain is needed, the new value of R1 would be______ and the new value of Rf would be _________. A) 12 k▲, 108 k▲ B) 12 k▲, 120 k▲ C) 13.3 k▲, 120 k▲ D) 10 k▲, 100 k▲ -Refer to c) in the figure above. If an amplifier with an input impedance of 12 k▲ and the same voltage gain is needed, the new value of R1 would be______ and the new value of Rf would be _________.


A) 12 k▲, 108 k▲
B) 12 k▲, 120 k▲
C) 13.3 k▲, 120 k▲
D) 10 k▲, 100 k▲

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-Refer to the figure above. Which circuit has a voltage gain of 20? A) a) B) b) C) c) D) None of the above. -Refer to the figure above. Which circuit has a voltage gain of 20?


A) a)
B) b)
C) c)
D) None of the above.

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If an op- amp were perfect, the CMRR would


A) be zero.
B) be very small.
C) approach infinity.
D) be less than one.

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