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2nd Year Instrumentation > Electrical And Digital Fundamentals > Flashcards

Electrical And Digital Fundamentals Flashcards

1
Q

Series cct:
Current
Voltage
Resistance

A

It = I1 = I2 ect
Vt = V1 +V2 ect
Rt = R1 + R2 ect

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2
Q

Parallel cct:
Voltage
Current
Resistance

A

Vt = V1 = V2 ect
It = I1 + I2 (kirchoffs current )
Rt = 1/ (1/R1 + 1/R2 ect)

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3
Q

Power formulas

A

P = I x V
P = I^2 × R
P = V^2 / R

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4
Q

T = 1/f is for

A

Time 1 cycle takes
T in sec
f frequency in Hz

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5
Q

V = Vp × sin X is for

A

Instantaneous Voltage
Vp = Vpeak
X is degrees of sin wave

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6
Q

Vp x .707 gives

A

Rms / effective value of sin wave

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7
Q

How much power is lost when a load of 20a is carried by a conductor with an Rt of .033

A

P = I^2 × R
P = 400 × .033
P = 13.2

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8
Q

How much resistance for a 20 watt resistor hooked upto 24 v?

A
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9
Q

This is for

A

Capacitors in ac series cct

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10
Q

This is for

A

Capacitors in series ac cct
Micro farads

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11
Q

t = RC is for

A

Time constant with capacitor dc cct

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12
Q

Time constant?

A
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13
Q

This is for?
Unit of measurement (answer)?

A

Capacitive reactance
Ohms

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14
Q

Each letter stands for?

A
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15
Q

This is for?

A

Capacitive reactance in series

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16
Q

This is for

A

Impedance in a cct with a capacitor

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17
Q

If you have .a .68 a 60hz supply what is the Vdrop across a 47uf capacitor?

A
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18
Q

CIV is my acronym for

A

Capacitive cct current leads voltage

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19
Q

This is for

A

Capacitors in parallel

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20
Q

This is for

A

Capacitive reactance in parallel

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21
Q

This is for

A

Total inductance in series ac

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22
Q

This is for?

A

1 inductive time constant in DC cct

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23
Q

This is for ?
F and L stand fot

A

Inductive reactance
F = frequency
L= in henries

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24
Q

This is for

A

Inductors in parallel

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25
Q

This is for?

A

Inductive reactance in parallel

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26
Q

Why are inductors sometimes called choke coils

A

They suppress sudden rise / fall in current

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27
Q

A conductor has how many valence electrons

A

1 to 3

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28
Q

A semi conductor has how many valence electrons

A

4

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29
Q

An insulator has how many valence electrons?

A

5 to 8

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30
Q

What can happen if you open a cct with a choke? Why is it important to suppress it?

A

A huge cemf spike
Because it can damage electonics

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31
Q

When you put voltage into P TYPE semi conductor material: ( electrons do what?)

A

It fills up the holes in molecular lattice and move up the conductor like bubbles at the bottom of a water cooler

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32
Q

A diode is made by? Does?

A

Attaching wies to a PN junction
Allows current to flow in 1 direction only

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33
Q

This is a?
Letters stand for?

A

A diode
A = annode
K = cathode

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34
Q

Def diode barrier potential

A

A certain minimum amount of voltage must be pushed across the PN junction so current can start to flow

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35
Q

This is a

A

Reverse bias diode

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36
Q

This is a

A

Zener diode

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37
Q

ELI the ICE man is

A

Voltage leads current inductive
Current leads voltage capacitive

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38
Q

A forward biased diode only allows current to flow if

A

The anode is positive with respect to the cathode

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39
Q

Most common element in semi conductor / solid state devices

A

Silicon (Si)

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40
Q

What is the rectified dc voltage for 3a 120v 60hz supply. Its ripple frequency?

A

V(ad) = 120/2 =60v
V(peak) = 60/.707 = 84.9
V(cd) = 84.9 × .637 = 54 vdc
RIPPLE:
2× f(hz) = 2 × 60 = 120

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41
Q

What is the % ripple of a 240 Vdc with an rms of 24v?

A

% = (rms/dc average )× 100
% = (24/240) × 100
% = .1 × 100 = 10%

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42
Q

What thermocouple provides the most linear response to a change in temp?

A

Type k

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43
Q

Seebeck calc for overall sensitivity

A

= 41.5 uV/ ‘C

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44
Q

Seebeck calc

A

Tm = Tr + V/S
Tr = 0’c
V = .00358
S = .0000415

Tm = 85’c

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45
Q

If using tables what # would you have?

A

Eo = Em-Er
Em = 4.279 - .790
You would look up 3.489 on type k table (about 85 -86 on type k)

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46
Q

A voltage of 3.217 mV is measured across a K type thermocouple. The reference junction is at 22’c. What is the measured temp of the thermocouple?

A

Eo = Em- Er so:
Em = Eo + Er
Em = 3.217 + .879
Em = 4.096 = 100’c

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47
Q

Colors Eo, Er, Em

A

Eo = rd
Em = blk
Er = blu

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48
Q

Methods of temp compensation

A
  • Constant temp chamber
  • Software
  • Hardware ( electronic that matches temp chsng)
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49
Q

Threaded thermowells can be installed in tanks/cylinders with pressure upto:

A

9MPag/ 1300 psig

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50
Q

Thermowells can be welded in with wall thicknesses greater than _____ unless :

A

-35 mm
- With a connection peice can be less than 35 mm though

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51
Q

Convert 111001 to binary

A
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52
Q

Rules for adding binary

A
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53
Q

On calc how do you convert 57 to hex or bin?

A
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54
Q

____ is a continuously changing signal

A

Analog

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55
Q

Digital works in ____ ex: 4 m tank

A

Steps
If set for 16 values
4m/15 steps ( zero as a step)
.25 m per step

56
Q

This is a

57
Q

This is a

58
Q

This is a

A

Not gate ( the little circle shows not)

59
Q

This is a

A

And gate with inverted b input

60
Q

This is a

61
Q

This is a

A

Xor, 3xclusive or

62
Q

This is a ? Its table?

A

Basic sr latch .

63
Q

This is a? Table?

A

Gated d latch

64
Q

A • B is

65
Q

A × B is

66
Q

Is?

A

Not A and B

67
Q

Yellow side is? Blue?

A

Yellow: volts per division
Blue: time per division

68
Q

Peak to peak v? Frequncy?

A

Pp: 8v
F = 1/.08 (80 milliseconds) = 12.5 hz

69
Q

Zener diode

70
Q

Current through zener( k ohms not ohms)

71
Q

What is a comp word

A

A group of bits accessed as a group

72
Q

How big it a byte

73
Q

Location of a word in comps memory

A

Its address

74
Q

3 states of a tri state buffer?

A
  • 1
  • 0
    -high impedance Z
75
Q

3busses for a CPU?

A
  • address bus
  • data bus
  • control bus
76
Q

During boot up what 3 tasks does a microprocessor do?

A
  • self test
  • initializes peripheral devices
  • loadin/ starting o/s
77
Q

A micro controller is?

A

A complete but small comp on an integrated cct

78
Q

3 comp mass storage dices “ non removable “

A
  • hard drive
  • optical drive
  • ssd
79
Q

In a comp what does a buffer do?

A

Prevents 1 part of an electronic cct from negatively affecting other ccts

80
Q

In a comp this symbol means?

81
Q

In a compy this is

A

Tri state buffer

82
Q

This is a

A

NC level switch

83
Q

This is a

A

NO level switch

84
Q

This is a

A

NC pressure switch

85
Q

This is ac

A

NO pressure switch

86
Q

This is a

A

NO flow switch

87
Q

This is a

A

NO flow switch

88
Q

This is a

A

NC temp switch

89
Q

This is a

A

NO temp switch

90
Q

This is a

A

NC limit switch

91
Q

This is a

A

NO limit switch

92
Q

This is a

A

Relay coil

93
Q

These are

94
Q

Major components of a modular plc are

A
  • power supply
  • backplane
  • CPU
  • input / output
95
Q

Of a plc has a key switch it usually goes between 3 modes :

A
  • programming
  • operation
  • remote
96
Q

Scan cycle steps?

A
  • input scan
  • user - program scan
  • output scan
97
Q

Plc adress I:30.4

A

I = input
3 = slot 3
0 = word
4 = #4

98
Q

Plc address O:50.2

A

Output
Slot 5
Word
2 #2

99
Q

Difference between analog and digital plc adress

A

The word has a 0 in digital and numerical value in analog
Ie I:62

100
Q

This is current ____

101
Q

This is current _____

A

Current sinking

102
Q

The LEDS on the plc are, unless there are 2 then?

A
  • status
    2 are
    Right: logic light
    Left : output light
103
Q

Analog input modules are specified by 3 things

A
  • input range
  • # of points they have
  • way power is connected
104
Q

A 16 bit word is ______ bits

105
Q

Plc. This is? Operates?

106
Q

Plc. This is ? Operates?

107
Q

Plc. This is? Operates?

108
Q

Plc. This is? Operates

109
Q

Plc. This is? Operates?

110
Q

Plc. This is? Operates?

111
Q

When you create a plc tag you must specify?

A
  • name ( alias / internal)
  • data type ( Bool / Int ect)
  • scope ( global or local)
112
Q

Plc. This is?

113
Q

Plc. This is?

114
Q

Plc. This is?

A

FB and programing block

115
Q

Data communications - 2 levels

116
Q

This is what type of communication?

A

Simplex. 1 way

117
Q

This is what kind of communication?

A

Full duplex. Goes both ways

118
Q

This is ?

A

Half duplex. Goes both ways but 1 at a time “ single lane bridge”

119
Q

Request communication to ready response is called

A

A handshake

120
Q

B is

121
Q

) is

122
Q

This is a

A

Point to point network

123
Q

This is a

A

Star network

124
Q

This is a b

A

Bus network

125
Q

This is a r

A

Ring network

126
Q

This is a

A

Mesh network

127
Q

When each wire sends 1 bit ( 8 bit = 8 wires) its a

A

Parallel transmission

128
Q

Serial transmission

A
  • 1 wire, gets signal and pulses bits
  • start bit always 0 (space)
  • end bits always 1 (mark)
129
Q

This is

A

Asynchronous transmission

130
Q

This transmission uses clock (sends datta on sinking edge)

A

Synchronous

131
Q

HART is

A

2 way communication between feild devices and controller

132
Q

Rs -232

A

2 wires
Originally for dte to dce only
Now mostly between comps w a null modem

133
Q

Rs-232 on/ off are( voltages)

A

1 off -5 to - 15v
0 on +5 to +15v

134
Q

Rs-485?

A

4 wires: 2 in , 2 out
Balanced transmission
1/2 duplex

135
Q

Rs-485 handshake ?

136
Q

HUH?

2nd Year Instrumentation (8 decks)

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