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ECE > Quiz 2 (04) > Flashcards

Quiz 2 (04) Flashcards

1
Q

A differentiator is used to measure

A

the rate of change of the input voltage

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2
Q

In a comparator with output bounding, what type of diode is used in the feedback loop?

A

Zener

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3
Q

How many op-amps are required to implement this equation? Vo = V1

A

1

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4
Q

A ______ filter rejects all frequencies within a specific band and passes all those outside this band

A

band-stop

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5
Q

A _____ filter passes all frequencies within a band between a lower and an upper critical frequency and rejects all others outside this band.

A

band-pass

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6
Q

Only the condition Ba = _____ must be satisfied for self-sustained oscillations to result

A

1

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7
Q

The attenuation of the three-section RC feedback phase-shift oscillator is

A

1/29

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8
Q

The feedback signal in a(n) _______ oscillator is derived from a capacitive voltage divider in the LC circuit.

A

Colpitts

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9
Q

Which of the following oscillators is (are) tuned oscillators?

A

Crystal, Colpitts and Hartley (All)

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10
Q

An ideal op-amp circuit has _____ input impedance, ________ output impedance, and _____ voltage gain

A

infinite, zero, infinite

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11
Q

The output signal of an op-amp is _____ out of phase with its input signal connected to the inverting input terminal

A

180 degrees

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12
Q

Negative feedback results in

A

decreased voltage gain

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13
Q

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

A

Oscillators, Filters, Instrumentation Circuits (All)

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14
Q

The output voltage of a summing amplifier is proportional to the sum of the input voltages (T or F)

A

True

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15
Q

The positive feedback voltage in an oscillator has no net phase shift (T OR F)

A

True

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16
Q

Crystal oscillators are inherently unstable (T or F)

A

False

17
Q

Oscillators operate on negative feedback (T or F)

A

False

18
Q

A band-pass filter can be created by cascading a high-pass filter and a low-pass filter (T or F)

A

True

19
Q

An active filter uses capacitors and inductors in the feedback network (T or F)

A

False

20
Q

A second-order filter has a roll-off of -20 db/decade (T or F)

A

False

21
Q

The common mode rejection ratio (CMRR) is a measure of an op-amp’s ability to reject common-mode input signals (T or F)

A

True

22
Q

Open-loop gain is always smaller than closed-loop gain (T or F)

A

False

23
Q

Closed-loop gain is the gain with negative feedback (T or F)

A

True

ECE (13 decks)

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