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B2 MODULE 5 > Subsection 03 Data Conversion > Flashcards

Subsection 03 Data Conversion Flashcards

1
Q

A charge balancing Analogue to Digital convertor ( ADC ) uses a closed loop system to compare?

A

The analogue input to give the required digital output.

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2
Q

A Digital to Analogue convertor is required to produce an output range of 0 to -10v this can be achieved by?

A

An inverting OP AMP connected in series with output.

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3
Q

A Digital to Analogue converter would use a Precision Amplifier to?

A

Ensure that the output voltages remain accurate

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4
Q

A Digital to Analogue converter can produce 256 different output voltages, this DAC has a resolution of?

A

8 BITS

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5
Q

A DAC converts?

A

Digital data to Analogue signals

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6
Q

A DAC uses a precision amplifier to?

A

Ensure the output voltages remain accurate

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7
Q

A Digital output of Binary 1100 from a 12v Maximum Analogue to digital converter would represent a Analogue input of?

A

9.6v

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8
Q

A DAC has a resolution of 0.3v, what will be the analogue output when the digital input is 10110?

A

6.6v D.C.

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9
Q

A DAC that requires the output to range between 0 and -10v would have?

A

An inverting amplifier in series with the output line.

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10
Q

A digital voltmeter uses a?

A

ADC

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11
Q

A dual slope ADC is more prone to timing errors due to the?

A

Increased level of complexity

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12
Q

A Given transducer provides a voltage which corresponds to true heading, this voltage can be converted to “BITS” by using a?

A

ADC

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13
Q

A Ladder resistive network with reference voltage and switching system, fed to a summing amplifier could be used as a?

A

DAC

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14
Q

A Limitation of a flash ADC is?

A

It requires many parts

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15
Q

A number represented as a physical quantity e.g. voltage or speed of rotation is?

A

ANALOGUE

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16
Q

A precision op-amp is used in a DAC to?

A

Give an output at a required level

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17
Q

An ADC uses successive approximation to?

A

Increase speed

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18
Q

An ADC converts?

A

Analogue signals to digital data

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19
Q

An ADC uses successive approximation to?

A

Increase speed

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20
Q

An ADC requires?

A

A reference voltage, an input gate, an internal counter and a comparator.

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21
Q

An ADC is as accurate as?

A

The sampling rate.

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22
Q

An ADC where it counts up to binary state equal to the analogue input then back down again. When this is reached is a?

A

Ramp type converter.

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23
Q

An encoder using Grey code changes?

A

Analogue to digital

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24
Q

An input to a computer which will always require an ADC is?

A

A Microphone

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25
Q

An output from a computer that requires a DAC is a?

A

Speaker

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26
Q

An R-2R DAC has values of resistance whose precision are?

A

Not accurate

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27
Q

An R-2R DAC uses two values of resistors whose precision is?

A

Not important

28
Q

Analogue Logic 1 is closed circuit, Logic Q = ?

A

1

29
Q

Audio data that is stored in MP3 format will require a DAC to ?

A

Broadcast it in the aircraft cabin

30
Q

Audio sounds recorded digitally are?

A

Superior quality and greater bandwidth

31
Q

Digital signals can be represented?

A

Only as a binary value

32
Q

If a signal has quantity in volts and physical position it is?

A

Analogue

33
Q

If an ADC has a resolution of 2%, 100v might be read as

A

99-101v

34
Q

In an Analogue to digital conversion, a signals bandwidth represents?

A

The maximum frequency range occupied by a signal

35
Q

In an ADC the input voltage?

A

Stays on constantly

36
Q

In a successive approximation ADC the time interval between the SC and EOC signal is?

A

The conversion time

37
Q

In a R-2R ladder converter the values of resistors?

A

Do not need to be of precise value.

38
Q

Op Amps generally used in ADC’s and DAC’s are normally?

A

Hi Input Impedance, Low Output Impedance

39
Q

Physical variables in quantative forms such as voltage or angular rotation of a shaft are?

A

Analogue

40
Q

Sample and hold is a technique used in?

A

Analogue to digital conversion

41
Q

The accuracy of a DAC is dependant upon?

A

The number of BITS and type of DAC

42
Q

The advantage of digital sound over analogue is?

A

Minimal errors and noise

43
Q

The counter ( or ramp ) ADC uses a counter in conjunction with a DAC to determine the?

A

Equivilant to the unknown digital input voltage

44
Q

The function of a commutator is to provide?

A

Sampling in sequence of a number of parameters

45
Q

The input of a DAC is?

A

Digital data

46
Q

The input of a ADC is?

A

Analogue data

47
Q

The limiting factor using a resistor based DAC is?

A

The quality and size of resistors

48
Q

The microphone in a mobile phone is an example of a?

A

ADC

49
Q

The sampling frequency of an ADC is precisely the frequency of the AC analogue signal being measured, the output of the ADC will be a series of digital values corresponding to?

A

A DC signal

50
Q

Transistors are used in a current triggered Digital to Analogue device to?

A

Change the state of the inputs

51
Q

What does 1 represent in an analogue system?

A

Switches closed, magnetised

52
Q

What is the “ throughput rate “ for the ADC?

A

The number of complete digital words encoded in a specified unit of time.

53
Q

What is the advantage of a digital ramp type ADC over a flash type?

A

Digital ramp type are much cheaper to manufactuer

54
Q

What is the advantage of a flash type ADC over a digital ramp type?

A

Flash operates at a much faster speed than digital ramp type.

55
Q

What is an advantage of an R-R2 ladder DAC over a binary weight resistor?

A

Only 2 resistor values are used and therefore greater accuracy is achieved particular with temperature variations

56
Q

What is serial to parallel and vica versa called?

A

Multiplex and Demultiplex

57
Q

What is the quickest method of ADC?

A

Flash converter

58
Q

What is the resolution of ADC and DAC converters?

A

Number of descrete values that can be represented by the digital word

59
Q

What may a digital ramp ADC also be known as?

A

Counter type ADC

60
Q

What type of ADC would be used if very high converting speeds are required?

A

Flash converter

61
Q

What type of DAC uses a different value of resistors for each input?

A

Binary weighted resistor DAC

62
Q

What type DAC uses two different value resistors in its construction?

A

R-2R ladder

63
Q

When converting analogue signals to digital the resolution is determined by?

A

The number of BIT’s used to represent the signal

64
Q

What is the fastest ADC?

A

Flash type

65
Q

Within a computer controlled flight system, position feedback is converted from?

A

Analogue to digital

B2 MODULE 5 (17 decks)

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