Quiz 2 (02)

Question 1

Name the filter that has two stop bands?

Answer 1

Band-pass filter

Question 2

The gain of the first order low pass filter

Answer 2

Decreases at the rate 20dB/decade

Question 3

An electrical filter is a

Answer 3

Frequency-selective circuit

Question 4

Filters are classified as

Answer 4

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

Question 5

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

Answer 5

Integrator

Question 6

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

Answer 6

Colpitts oscillator

Question 7

Among the following, which is a fixed frequency oscillator?

Answer 7

Crystal oscillator

Question 8

The oscillator that gives good frequency stability is ____________?

Answer 8

Crystal oscillator

Question 9

Oscillation requires:

Answer 9

A stage with gain

Question 10

Colpitts oscillator can be recognized by:

Answer 10

A split capacitance in the tuned circuit

Question 11

In an oscillator circuit, the feedback should be:

Answer 11

Just enough to sustain oscillation

Question 12

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

Answer 12

In-phase feedback

Question 13

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

Answer 13

Low drift

Question 14

The acoustic feedback in a public-address system

Answer 14

Serves no useful purpose

Question 15

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

Answer 15

Higher switching speeds are attainable

Question 16

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

Answer 16

Greater power capability

Question 17

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

Answer 17

Inductors

Question 18

An op amp usually employs negative feedback to:

Answer 18

Control the gain

Question 19

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

Answer 19

A radio broadcast transmitter’s final amplifier

Question 20

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

Answer 20

A comparator

Question 21

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

Answer 21

10111

Question 22

The binary number 110001 represents the digital number:

Answer 22

49

Question 23

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

Answer 23

Low

Question 24

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

Answer 24

Low

Question 25

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

Answer 25

This logic statement makes no sense

Question 26

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

Answer 26

Always 1

Question 27

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

Answer 27

Always 0

Question 28

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

Answer 28

16

Question 29

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

Answer 29

to compare the input voltages to the internal voltage divider

Question 30

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

Answer 30

duty cycle

Question 31

The 555 timer pin 1 has

Answer 31

Ground

Question 32

The standard 555 package includes

Answer 32

2 comparators

Question 33

The 555 timer pin 2 has

Answer 33

Trigger

Question 34

In 555 timer, reset is present at pin

Answer 34

4

Question 35

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

Answer 35

It is the smallest analog output change

Question 36

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

Answer 36

piezoelectric

Question 37

Determine the time period of a monostable 555 multivibrator

Answer 37

T = 1.1RC

Question 38

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

Answer 38

The astable is free running

Question 39

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

Answer 39

1

Question 40

The monostable multivibrator circuit is not an oscillator because ________.

Answer 40

it requires a trigger to obtain an output signal

Question 41

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

Answer 41

resolution

Question 42

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?

Answer 42

It only uses two different resistor values.

Question 43

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

Answer 43

dc

Question 44

The 7812 regulator IC provides ________.

Answer 44

12 V

Question 45

The 7912 regulator IC provides ________ .

Answer 45

-12 V

Question 46

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

Answer 46

Decrease the ac voltage component

Question 47

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

Answer 47

The time during which the diodes are conducting

Question 48

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

Answer 48

2

Question 49

How many terminals does a 7800 series IC regulator have?

Answer 49

3

Question 50

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

Answer 50

Capacitor filter