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Elecs- Indiabix (Terms) > Ekectronic Devices 6- Comms To Linear Digital IC > Flashcards

Ekectronic Devices 6- Comms To Linear Digital IC Flashcards

1
Q

An AM demodulator can be implemented with a linear multiplier followed by a ________ filter.
low-pass
high-pass
band-pass
band-stop

A

low-pass

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2
Q

The intermediate frequency in a standard AM receiver is
455 Hz.
455 kHz.
4.55 MHz.
none of the above

A

455 kHz.

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3
Q

In order for a light ray to propagate along a fiber-optic cable, what must the relationship be between the angle of incidence and the critical angle?
θi > θc
θi < θc
θi = θc
none of the above

A

θi > θc

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4
Q

Light may be propagated along a fiber-optic cable in which of the following modes?
multimode step index
single-mode step index
multimode graded index
all of the above

A

all of the above

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5
Q

In AM, the carrier is changed by a modulating signal. What parameter of the carrier is changed?
amplitude
frequency
pulse width
phase

A

amplitude

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6
Q

The output spectrum of a ________ modulator includes upper-side and lower-side frequencies and the carrier frequency.
balanced
standard amplitude
none of the above

A

standard amplitude

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7
Q

Amplitude modulation is a ________ process.
multiplication
division
sum/difference

A

multiplication

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8
Q

What does VCO stand for?
Visually-Controlled Organization
Voltage-Controlled Oscillator
Voltage-Centered Oscilloscope

A

Voltage-Controlled Oscillator

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9
Q

A phase-locked loop (PLL) is a feedback circuit consisting of a
phase detector.
low-pass filter.
VCO.
all of the above

A

all of the above

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10
Q

If a 1 MHz carrier is amplitude modulated with a 5 kHz audio signal, the upper-side frequency is ________ kHz.
1005
1000
995
none of the above

A

1005

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11
Q

Which of the following areas is (are) an application of infrared-emitting diodes?
Intrusion alarms
Shaft encoders
Paper-tape readers
All of the above

A

All of the above

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12
Q

Schottky diodes are very effective at frequencies approaching ________.
20 GHz
10 MHz
100 MHz
1 MHz

A

A

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13
Q

What is the voltage drop across Schottky diodes?
0 V to 0.2 V
0.7 V to 0.8 V
0.8 V to 1.0 V
1.0 V to 1.5 V

A

0 V to 0.2 V

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14
Q

In which region is the operating point stable in tunnel diodes?
Negative-resistance
Positive-resistance
Both negative- and positive-resistance
Neither negative- nor positive-resistance

A

Positive-resistance

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15
Q

What is the range of the varying capacitor CT in varactor diodes?
0 pF to 5 pF
2 pF to 10 pF
2 F to 100 F
2 pF to 100 pF

A

2 pF to 100 pF

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16
Q

What is the maximum temperature limit for liquid-crystal displays (LCDs)?
10ºC
30ºC
60ºC
100ºC

A

60ºC

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17
Q

Which of the following diodes is limited to the reverse-bias region in its region of operation?
Schottky
Tunnel
Photodiode
Rectifier

A

Photodiode

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18
Q

The majority of power diodes are constructed using ________.
molybdenum
platinum
tungsten
silicon

A

silicon

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19
Q

Which of the following is (are) diodes?
Schottky
Varactor
Tunnel
All of the above

A

All of the above

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20
Q

What is the limit of peak current IP in tunnel diodes?
A few microamperes to several hundred amperes
A few microamperes to several amperes
A few microamperes to several milliamperes
A few microamperes to several hundred microamperes

A

A few microamperes to several hundred amperes

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21
Q

What is the response time of LCDs?
Less than 100 ns
50 ms
100 ms to 300 ms
400 ms

A

100 ms to 300 ms

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22
Q

What is the typical level of change in resistance per degree change in temperature?
1% to 2%
3% to 5%
7% to 10%
10% to 25%

A

3% to 5%

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23
Q

What is the maximum peak voltage for tunnel diodes?
50 mV
100 mV
250 mV
600 mV

A

600 mV

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24
Q

Which of the following semiconductor materials is (are) used for manufacturing solar cells?
Gallium arsenide
Indium arsenide
Cadmium sulfide
All of the above

A

All of the above

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25
Q

Which of the following semiconductor materials is (are) used in the manufacturing of tunnel diodes?
Germanium
Gallium
Both germanium and gallium arsenide
Silicon

A

Both germanium and gallium arsenide

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26
Q

What is the power density received from the sun at sea level?
10 mW/cm2
100 mW/cm2
500 mW/cm2
1 W/cm2

A

100 mW/cm2

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27
Q

The varicap diode has a transition capacitance sensitive to the applied reverse-bias potential that is a maximum at zero volts and decreases ________ with increasing reverse-bias potentials.
logarithmically
parabolically
exponentially

A

exponentially

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28
Q

For a 50-A unit, the PIV of the Schottky is about ________ compared to 150 V for the p-n junction variety.
25
50
75
100

A

50

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29
Q

What metal(s) is(are) used in the construction of Schottky diodes?
Molybdenum
Platinum
Tungsten
Silicon
Any of the above

A

Any of the above

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30
Q

Which of the following metals is (are) used in the fabrication of Schottky diodes?
Molybdenum
Platinum
Tungsten
All of the above

A

All of the above

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31
Q

What is the resistance of thermistors at boiling temperature (100ºC)?
5 k
1 k
100
1

A

100

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32
Q

Which of the following areas is (are) applications of varactor diodes?
FM modulators
Automatic-frequency control devices
Adjustable bandpass filters
All of the above

A

All of the above

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33
Q

Which of the following materials is (are) used in the manufacturing of thermistors?
Ge
Si
A mixture of oxides of cobalt, nickel, strontium, or manganese
All of the above

A

All of the above

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34
Q

What is the ratio IP / IV for gallium arsenide?
1:1
5:1
10:1
20:1

A

20:1

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35
Q

What is the response time of light-emitting diodes (LEDs)?
Less than 100 ns
50 ms
100 ms to 300 ms
400 ms

A

Less than 100 ns

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36
Q

What type of temperature coefficient do thermistors have?
Positive
Negative
Either positive or negative
None of the above

A

Either positive or negative

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37
Q

Which of the following diodes has a negative-resistance region?
Schottky
Varactor
Tunnel
Power

38
Q

The tuning diode is a ________-dependent, variable ________.
voltage, resistor
current, capacitor
voltage, capacitor
current, inductor

A

voltage, capacitor

39
Q

What is the resistance of thermistors at room temperature (20ºC)?
5 k
1 k
100
1

40
Q

What is the response time of cadmium sulfide (CdS) in photoconductive cells?
100 ms
50 ms
25 ms
10 ms

41
Q

What are the typical ranges of reverse-bias current levels IS for low-power and high-power Schottky diodes at room temperature?
Picoamperes, nanoamperes
Nanoamperes, microamperes
Microamperes, milliamperes
Milliamperes, amperes

A

Microamperes, milliamperes

42
Q

Which of the following devices does not have a cathode terminal?
SCR
SCS
Triac
Shockley diode

43
Q

Which of the following devices is unquestionably of the greatest interest today?
SCR
GTO
LASCR
SCS

44
Q

Which of the following devices has a negative-resistance region in its characteristics curve?
SCR
SCS
Unijunction transistor
Phototransistor

A

Unijunction Transistor

45
Q

How many terminals does a programmable unijunction transistor (PUT) have?
4
3
2
1

46
Q

What is the typical value of the reverse resistance of SCRs?
1 to 10
100 to 1 k
1 k to 50 k
100 k or more

A

100 k or more

47
Q

The ISO-LIT Q1 16-pin Litronix opto-isolator DIP contains ________ opto-isolators.
4
8
12
6

48
Q

How many terminals does a Shockley diode have?
5
4
3
2

49
Q

What is the range of the variable resistor in the equivalent circuit of a unijunction transistor?
50 to 5 k
6 k to 10 k
5 to 50
1 to 5

50
Q

Which one of the SCR terminals fires the SCR?
Anode
Cathode
Gate
All of the above

51
Q

Which of the following devices has the smallest turn-off time?
SCR
GTO
SCS
LASCR

52
Q

What is the range of the turn-on times in high-power SCR devices?
30us to 100us
10us to 25us
5us to 8us
1us to 5us

A

10us to 25us

53
Q

What is the frequency range of application of SCRs?
About 10 kHz
About 50 kHz
About 250 kHz
About 1 mHz

A

About 50 kHz

54
Q

Which of the following devices has nearly the same turn-on time as turn-off time?
SCR
GTO
SCS
LASCR

55
Q

Which of the transistors of an SCR are conducting when the SCR is fired and is in the conduction mode?
npn
pnp
Both npn and pnp
Neither npn nor pnp

A

Both npn and pnp

56
Q

For an SCS, a ________ pulse at the anode gate turns the device on, while a ________ pulse will turn it off.
negative, positive
positive, negative

A

negative, positive

57
Q

Which of the following devices has (have) four layers of semiconductor materials?
Silicon-controlled switch (SCS)
Gate turn-off switch (GTO)
Light-activated silicon-controlled rectifier (LASCR)
All of the above

A

All of the above

58
Q

Which of the following parameters are usually provided by the manufacturer on the specification sheet for SCRs?
Turn-on time (ton )
Turn-off time (toff )
Junction and case temperatures (tj and tc )
All of the above

A

All of the above

59
Q

What is the maximum current (rms) rating for commercially available LASCRs today?
3 A
15 A
20 A
25 A

60
Q

Which of the following areas is (are) applications of an SCS?
Counters
Pulse generators
Voltage sensors
All of the above

A

All of the above

61
Q

How many terminals does a silicon-controlled switch (SCS) device have?
2
3
4
5

62
Q

What is the typical value of the triggering anode gate for SCS devices?
1.5 mA
150 A
15 A
1 A

63
Q

What is the typical range of turn-off times for SCRs?
5us to 30us
1us to 5us
0.1us to 1us
0.01us to 0.1us

A

5us to 30us

64
Q

Which of the following is (are) the advantages of the SCS over a corresponding SCR?
Reduced turn-off time
Increased control and triggering sensitivity
More predictable firing situation
All of the above

A

All of the above

65
Q

Which of the following transistors is an SCR composed of?
npn, pnp
npn, npn
pnp, pnp
None of the above

66
Q

A thyristor is a ________-layer semiconductor material device.
2
3
4
5

67
Q

How many layers of semiconductor materials does a silicon-controlled rectifier (SCR) have?

68
Q

What is the level of the output voltage of a ladder-network conversion?
The analog output voltage proportional to the digital input voltage
The digital output voltage proportional to the linear input voltage
A fixed digital value Vref
A fixed analog value Vref

A

The analog output voltage proportional to the digital input voltage

69
Q

Which of the following is not a linear/digital IC?
Phase-locked loop
Voltage-controlled oscillator
Passive filter
Comparator

A

Passive filter

70
Q

A 339 IC is an example of a fourteen-pin DIP that can be made to function as a ________.
comparator
555 timer
D to A converter
ladder network

A

comparator

71
Q

What is the minimum number of conversions per second of a clock rate of 1 MHz operating a 10-stage counter in an ADC?
1000
976
769
697

72
Q

Which of the following is (are) the results of improvements built into a comparator IC?
Faster switching between the two output levels
Noise immunity
Outputs capable of directly driving a variety of loads
All of the above

A

All of the above

73
Q

What is the first phase of the dual-slope method of conversion?
Connecting the analog voltage to the integrator for a fixed time
Setting the counter to zero
Connecting the integrator to a reference voltage
All of the above

A

Connecting the analog voltage to the integrator for a fixed time

74
Q

What is the maximum conversion time of a clock rate of 1 MHz operating a 10-stage counter in an ADC?
1.024 s
102.3 ms
10.24 ms
1.024 ms

75
Q

On which of the following does the conversion depend in ladder-network conversion?
Comparator
Control logic
Digital counter
Clock

A

Comparator

76
Q

Which of the following applications include a phase-locked loop (PLL) circuit?
Modems
Am decoders
Tracking filters
All of the above

A

All of the above

77
Q

What is the function of a ladder network?
Changing an analog signal to a digital signal
Changing a linear signal to a digital signal
Changing a digital signal to an analog signal
None of the above

A

Changing a digital signal to an analog signal

78
Q

Which of the slope intervals of the integrator does the counter in the analog-to-digital converter (ADC) operate?
Positive
Negative
Both positive and negative
Neither positive nor negative

A

Both positive and negative

79
Q

A 311 IC is an example of an eight-pin DIP that can be made to function as a ________.
comparator
555 timer
D to A converter
ladder network

A

comparator

80
Q

What is (are) the level(s) of the input voltage to a ladder-network conversion?
0
Vref
0 V or Vref
None of the above

A

0 V or Vref

81
Q

At which of the following period(s) is the counter advanced (incremented) in dual-slope conversion?
During the charging of the capacitor of the integrator
During the discharging of the capacitor of the integrator
During both the charging and discharging of the capacitor of the integrator
None of the above

A

During the discharging of the capacitor of the integrator

82
Q

How many Vcc connections does the 565 PLL use?
0
1
2
3

83
Q

What is (are) the input(s) to the comparator in the ladder-network conversion of an ADC?
Staircase voltage
Analog input voltage
Both staircase and analog input voltage
None of the above

A

Both staircase and analog input voltage

84
Q

How many comparators does a 339 IC contain?
4
3
2
1

85
Q

When is the counter set to zero in the dual-slope method of conversion?
Prior to the charging of the capacitor of the integrator
While the capacitor is being charged
At the end of the charging of the capacitor
During the discharging of the capacitor

A

At the end of the charging of the capacitor

86
Q

Which of the following devices is (are) a component of a digital-to-analog converter (DAC)?
Integrator
Comparator
Digital counter
All of the above

A

All of the above

87
Q

Which of the following circuits is (are) linear/digital ICs?
Comparators
Timers
Voltage-controlled oscillators
All of the above

A

All of the above

88
Q

Which of the following best describes the output of a 566 voltage-controlled oscillator?
Square-wave
Triangular-wave
Both square- and triangular-wave
None of the above

A

Both square- and triangular-wave

89
Q

What is the voltage resolution of an 8-stage ladder network?
Vref /128
Vref /256
Vref /512
Vref /1024

90
Q

Which of the following frequencies is associated with the 565 frequency-shift keyed decoder?
1070 Hz
1270 Hz
Both 1070 Hz and 1270 Hz
None of the above

A

Both 1070 Hz and 1270 Hz

Elecs- Indiabix (Terms) (6 decks)

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