310203c Introduction To Digital

Question 1

What is an analog device

Answer 1

An analog device uses circuitry that represents information as an analog signal, such as a current or voltage

Question 2

What is an analog signal?

Answer 2

An analog signal represents a variable that can be continuously observed and continuously represented

Question 3

What is a digital device?

Answer 3

A digital device uses a circuitry that represents information as a digital signal, such as 2 different voltages

Question 4

What is a digital signal?

Answer 4

A digital signal represents information through a set of discrete (separate and distinct) numerical values

Question 5

What are some advantages of digital circuitry over analog circuitry?

Answer 5

1. Digital circuitry is easier to design
2. Manufacturing can be more economical, cheaper
3. Less susceptible to noise
4. You can manipulate digital data and store it more effectively than analog data

Question 6

Why are digital transmitters the first choice in the industry?

Answer 6

1. Easy to program
2. Reliable
3. Accurate
4. The time between calibrations is longer than with analog transmitters
5. Digital transfers have internal diagnostic capabilities to help troubleshoot problems, analog transmitters do not

Question 7

Explain the operating process of a digital transmitter measuring a process variable

Answer 7

1. Digital transmitters have a sensor that converts the process ferrell to an analog voltage signal
2. This analog voltage is then changed to a digital signal by an analog to digital converter (ADC)
3. The digital circuitry conditions the digital signal to represent the process variable in engineering units
4. If you are using digital communication, then you can communicate the process variable with engineering units directly to the control system
5. If you use analog communication, then you need to change the digital data signal back to an analog signal by a digital-to-analog converter

Question 8

What type of clothing material generates static charges?

Answer 8

Clothing made of synthetic (polymers) generate static charges

Question 9

What type of clothing material does not generate static charges?

Answer 9

Clothing made of cotton does not generate static charges.

Question 10

How would the number 7 be represented in the binary system?

Answer 10

0111

Question 11

How would the number 5 be represented in the binary system?

Answer 11

0101

Question 12

How would the number 6 be represented in the binary system?

Answer 12

0110

Question 13

How would the number 10 be represented in the binary system?

Answer 13

1010

Question 14

How would the number 3 be represented in the binary system?

Answer 14

0011

Question 15

How would the number 9 be represented in the binary system?

Answer 15

1001

Question 16

What is a bit?

Answer 16

A bit is a single binary number.

Question 17

How many bits are used to store a SINT?

Answer 17

8 bits

Question 18

How many bits are used to store a INT?

Answer 18

16 bits

Question 19

How many bits are used to store a DINT?

Answer 19

32 bits

Question 20

Very large integer numbers and numbers with a fractional part are represented in binary by the _________________number system

Answer 20

Very large integer numbers and numbers with a fractional part are represented in binary by the floating point number system

Question 21

What is the preferred method to represent a signed integer in binary?

Answer 21

2’s compliment

Question 22

The ___________ series define the materials association with positive or negative charges

Answer 22

The triboelectric series define the materials association with positive or negative charges

Question 23

List 5 ESD prevention methods within an EPA

Answer 23

1. Conductive filaments on garments
2. Conductive wrist and footstraps connected to ground
3. Anti static workbench mats or conductive footmats
4. Humidity control
5. Flooding the air with ions