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ECE > Quiz 2 (02) > Flashcards

Quiz 2 (02) Flashcards

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1
Q

Name the filter that has two stop bands?

A

Band-pass filter

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2
Q

The gain of the first order low pass filter

A

Decreases at the rate 20dB/decade

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3
Q

An electrical filter is a

A

Frequency-selective circuit

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4
Q

Filters are classified as

A

Analog or digital, Passive or active, Audio or radio frequency

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5
Q

If a capacitor is placed in the feedback path of an op-amp circuit, then the circuit can act as

A

Integrator

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6
Q

Which oscillator is characterized by a split capacitor in its tank circuit?

A

Colpitts oscillator

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7
Q

Among the following, which is a fixed frequency oscillator?

A

Crystal oscillator

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8
Q

The oscillator that gives good frequency stability is ____________?

A

Crystal oscillator

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9
Q

Oscillation requires:

A

A stage with gain

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10
Q

Colpitts oscillator can be recognized by:

A

A split capacitance in the tuned circuit

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11
Q

In an oscillator circuit, the feedback should be:

A

Just enough to sustain oscillation

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12
Q

An oscillator might fail to start for any if the following reasons except:

A

In-phase feedback

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13
Q

The advantage of a crystal-controlled oscillator over a VFO is:

A

Low drift

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14
Q

The acoustic feedback in a public-address system

A

Serves no useful purpose

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15
Q

Because of the small size of ICs compared with equivalent circuits made from discrete
components:

A

Higher switching speeds are attainable

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16
Q

Which of the following is not an advantage of ICs over discrete components?

A

Greater power capability

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17
Q

Which of the following component is generally not practical for fabrication in an IC?

A

Inductors

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18
Q

An op amp usually employs negative feedback to:

A

Control the gain

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19
Q

In which of the following devices would you be least likely to find an integrated circuit as the main component?

A

A radio broadcast transmitter’s final amplifier

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20
Q

Which type of IC is used to determine whether voltage levels are the same or not?

A

A comparator

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21
Q

The value of the decimal number 23 in binary form is:

A

10111

22
Q

The binary number 110001 represents the digital number:

A

49

23
Q

If X is high, what is the state of X NOR Y?

A

Low

24
Q

If X and Y are both high, what is the state of X NAND Y?

A

Low

25
Q

If X is high and Y is low, what is the state of X NOT Y?

A

This logic statement makes no sense

26
Q

If X = 1 and Y = 1, then X +YZ is:

A

Always 1

27
Q

If X = 0 and Y = 1, then X(Y + Z) is:

A

Always 0

28
Q

A logic circuit has four inputs W, X, Y, and Z. how many possible input combinations are
there?

A

16

29
Q

What is the function of the comparators in the 555 timer circuit?

A

to compare the input voltages to the internal voltage divider

30
Q

The ________ is defined as the time the output is active divided by the total period of the
output signal

A

duty cycle

31
Q

The 555 timer pin 1 has

A

Ground

32
Q

The standard 555 package includes

A

2 comparators

33
Q

The 555 timer pin 2 has

A

Trigger

34
Q

In 555 timer, reset is present at pin

A

4

35
Q

What is the resolution of a digital-to-analog converter (DAC)?

A

It is the smallest analog output change

36
Q

A crystal demonstrates the ________ effect when a mechanical force across the crystal causes
a small voltage to be generated.

A

piezoelectric

37
Q

Determine the time period of a monostable 555 multivibrator

A

T = 1.1RC

38
Q

What is the difference between an astable multivibrator and a monostable multivibrator?

A

The astable is free running

39
Q

A monostable 555 timer has the following number of stable states:

A

1

40
Q

The monostable multivibrator circuit is not an oscillator because ________.

A

it requires a trigger to obtain an output signal

41
Q

The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the:

A

resolution

42
Q

What is the major advantage of the R/2R ladder digital-to-analog (DAC), as compared to a binary-weighted digital-to-analog DAC converter?

A

It only uses two different resistor values.

43
Q

Voltage regulators keep a constant ________ output voltage when the input or load varies within limits.

A

dc

44
Q

The 7812 regulator IC provides ________.

A

12 V

45
Q

The 7912 regulator IC provides ________ .

A

-12 V

46
Q

What is the purpose of an additional RC filter section in a power supply circuit?

A

Decrease the ac voltage component

47
Q

In which period is the capacitor filter charged in a full-wave rectifier?

A

The time during which the diodes are conducting

48
Q

How many diodes conduct in the full-wave bridge rectifier while the capacitor is being
charged?

A

2

49
Q

How many terminals does a 7800 series IC regulator have?

A

3

50
Q

Across which of the following components of a power supply does the average (dc) voltage exist?

A

Capacitor filter

ECE (13 decks)

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