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Certified Technology Specialist-Designer > General questions > Flashcards

General questions Flashcards

1
Q 
Successfulley communication design intent requires a \_\_\_\_\_\_\_\_\_\_\_\_\_ approach
Structured
Random
Linear
Phased
A

Phased

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2
Q 
The Program Phase consists of:
Needs Analysis
Verification Documents
Design Specifications
Program Report
Construction drawings
A

Needs Analysis

Program Report

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3
Q 
The Design Phase consists of:
Needs Analysis
Verification Documents
Design Specifications
Program Report
Construction drawings
A

Design Specifications
Construction drawings
Verification Documents

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4
Q 
The Program Phase is also called the:
Discovery phase
Concept Design Phase
Construction Phase
Schematic Phase
Briefing Phase
A

Concept Design Phase

Briefing Phase

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5
Q 
Confirm scale using:
A ruler
The scale on the drawing
Common Building elements
A photocopy
A

Common Building elements

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6
Q 
3" measured on a 1/8" scale is actually:
24'
32'
16'
8'
A

24’

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7
Q 
Which drawing shows the space as if it were cut apart?
Reflected ceiling plan
Elevation Drawing
Section Drawing
Detail Drawing
Block drawing
A

Section Drawing

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8
Q

Who are end users?
People paying for the project
People who operate the system day to day
Architect, designer, allied trades,

A

People who operate the system day to day

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9
Q 
The eye can comfortably see how many degrees side to side?
8
10
15
30
A

15

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10
Q 
Details and words can be seen how many degrees from centre?
5-15
10-20
15-30
5-30
A

10-20

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11
Q 
Symbols and shapes can be seen how many degrees from centre
10-20
15-30
5-30
5-15
A

5-30

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12
Q 
The limit of colour discrimination is how many degrees from centre
10-20
5-30
30-75
30-60
A

30-60

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13
Q

Is the vertical field of view oriented more above or below straight ahead?

A

below. 10 degrees when standing and 15 degrees when sitting

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14
Q 
Optimal eye rotation is how many degrees below the line of sight
15
25
30
40
A

30

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15
Q 
Optimal eye rotation is how many degrees above the line of sight
15
25
30
40
A

25

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16
Q 
Comfortable head rotation is how many degrees side to side?
30
45
55
60
A

45

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17
Q

Two ways to determine the minimum distance to the screen are:
15 degrees from the top of the image to the eye; screen width
45 degrees right to left and 1/2 the screen height

A

15 degrees from the top of the image to the eye; screen width

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18
Q 
What is the standard seated eye height
30"
48"
50"
80"
A

48” or 4’

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19
Q 
How much circulation space does a person need?
.5m
.8m
1m
2m
A

1m

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20
Q 
Passageway clearance should be..
24"
36"
48"
56"
A

36”

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21
Q 
From the edge to a table to the nearest obstruction should be at least:
24"
30"
36"
48"
A

48”

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22
Q 
Minimum text height should be furthest viewer divided by:
99
120
150
300
A

150

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23
Q 
Furthest viewer should be screen height x \_\_, \_\_, \_\_ for Observing content, Inspecting content with clues, inspecting content without clues?
4, 5, 6
1, 2, 3
10, 5, 3
8, 6, 4
A

8, 6, 4

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24
Q 
Furthest viewer uses what measurement:
Image diagonal
Image height
Image width
viewing task
A

Image height

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25
Q 
Closest viewer uses what measurement:
Image diagonal
Image height
Image width
viewing task
A

Image width

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26
Q 
A good viewing cone or area is how many degrees off axis in either direction?
30
45
60
85
A

45

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27
Q

You have a 16:9 screen and know the diagonal, how do you determine the width?

A

Use a^2+b^2=c^2 to determine the 3rd number in the ratio (18.36). 16/18.36 = x/diagonal. Same applies for any of the dimensions.

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28
Q 
What measures the light coming from a source such as a light bulb?
Refractance meter
Incidence meter
Spot meter
Lumenance meter
A

Incidence meter

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29
Q 
What measures the light reflecting off a surface?
Refractance meter
Incidence meter
Spot meter
Illumenance meter
A

Spot meter

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30
Q 
An incidence meter uses which units of measurement?
Pick 3
Lux
Candelas
Lumens
Foot Lamberts
Footcandles
Candle power
A

Lumens, Footcandles, Lux

Lumens is the most common

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31
Q 
An spotmeter uses which unit of measurement?
Lux
Candelas
Lumens
Foot Lamberts
Footcandles
Candle power
A

Candelas. Technically candelas per square meter

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32
Q

A measured contrast ratio is what?

A

Average luminance of the 8 white squares divided by the average luminance of the 8 black squares

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33
Q

Minimum contrast ratios for passive viewing, basic decision making, analytical decision making, and motion video is (__, __, __, __)

6: 1, 16:1, 32:1, 100:1
7: 1, 15:1, 50:1, 80:1
10: 1, 20:1, 40:1, 80:1
3: 1, 13:1, 40:1, 60:1

A

7:1, 15:1, 50:1, 80:1

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34
Q 
Projector throw ratio = 
Distance/screen width
Distance/screen height
Screen width/distance
Screen height/distance
A

Distance/screen width

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35
Q 
When determining a projector's brightness, what de-rating value do you use?
.10
.50
.75
.90
A

.75

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36
Q

How do you measure the brightness of an existing projector?

A

Using an all white image and a spot meter, measure and average the lux in all 9 zones, then multiply by the hight and width in meters

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37
Q

What should the difference be between white image brightness and the work surface

A

+/- 3x

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38
Q 
What dB change is the smallest perceptible change noticable?
1
3
6
10
A

1 dB

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39
Q 
What dB change is a just noticable change?
1
3
6
10
A

3dB

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40
Q 
What dB change is twice or half as loud?
1
3
6
10
A

10dB

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41
Q 
Doubling or halving the distance produces what dB change?
1
3
6
10
A

6dB

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42
Q

Which x-log formula is for Power?
10 log
20 log

A

10 log.

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43
Q

Which x-log formula is for Distance?
10 log
20 log

A

20 log

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44
Q

Which x-log formula is for Watts?
10 log
20 log

A

20 log

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45
Q

Which x-log formula is for Voltage?
10 log
20 log

A

20 log

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46
Q

What is the reference or zero dB level for sound pressure? dB SPL

A

Basically zero

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47
Q

What is the reference or zero dB level for Voltage dBV?

A

1 volt

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48
Q

What is the reference or zero dB level for Voltage dBu? small u

A

.775 volts

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49
Q

What is the reference or zero dB level for Voltage dBW?

A

1 watt

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50
Q

What is the reference or zero dB level for Voltage dBw? small w

A

.001 watt or 1 mW

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51
Q 
Sound pressure SPL should be between what values?
3-90 
1-120
0-140
3-10
A

0-140 dB

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52
Q 
Microphone level dBu should be between what values?
0-140
-60 - -50
0-10
-10 - -45
A

-60 - -50 dBu which is well below .775 volts

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53
Q 
Line level dBu should be between what values?
0-4
1-140
-10 - -30
0 - -60
A

0-4

54
Q 
Consumer audio level is \_\_ dBV
0
4
-20
-10
A

-10dBV or .316 volts

55
Q 
How many dB above ambient should a space generally be?  Signal to noise ratio
\+10
\+25
0
-10
A

+25 dB A-weighted

If background noise is measured at 35 dB, the system should put out 60 dB

56
Q

If you are designing an audio system in a multi-purpose room, should you design it for a standing or seated audience?

A

Standing

57
Q 
Headroom dB for a speech application is:
6dB
10dB
20dB
25dB
A

10dB

58
Q 
Headroom dB for a program audio application is:
6dB
10dB
20dB
25dB
A

20dB

59
Q

For multiple microphone placement what is the 3:1 rule?

A

Mic to mic separation is 3x the mic to mouth distance

60
Q 
As a general rule what is the target SPL for speech reinforcement?
25dB
50dB
65dB
75dB
A

65dB

61
Q

Reflected audio arriving 50-80 milliseconds after direct audio is considered good or bad?

A

Bad. It’s an unwanted echo. Earlier than 50-80ms is reinforcement.

62
Q

To determine if amplified audio is stable you have to calculate what?

A

Gain before feedback

63
Q

What is Equivalent Acoustic Distance or EAD

A

The furthest distance one can go away from the speaker without needing amplification. Usually about 4 feet

64
Q 
Generally what is the Feedback Stability Margin FSM?
0dB
3dB
6dB
10dB
A

6dB

PAG must be about 6dB greater than NAG

65
Q 
Standards serve as what?
General guidelines
Rule of law
Common platform for understanding
Best practices
A

Common platform for understanding

66
Q 
In the heirarchy of design consultation what is the highest level?
Project Documentation
Regulatory Requirements
Manufacturer's Documentation
National Standards
A

Regulatory Requirements

67
Q 
Which 2 characteristics of light are most important to designers.
Source
Brightness
Colour temperature
Structure
A

Brightness

Colour temp

68
Q 
The units of measurement for brightness are: (3)
candelas per square meter
kelvin
nit
footlambert
foot candle
lux
A

nit
footlambert
lux

69
Q

Light falling on a surface is___?
Luminance
Illuminance

A

Illuminance

70
Q

Light relected from a surface is___?
Luminance
Illuminance

A

Luminance

71
Q 
The units of measurement for reflected light are: (2)
candelas per square meter
kelvin
nit
footlambert
foot candle
lux
A

Lux

Foot candles

72
Q

Direct light is measured with a what?
Incident Light meter
Spot meter

A

Incident Light meter

73
Q

Indirect light is measured with a what?
Incident Light meter
Spot meter

A

Spot meter

74
Q 
A "warm" CCT is below what Kelvin?
2500K
3200K
4000K
6000K
A

3200K

75
Q 
A "cool" CCT is above what Kelvin?
2500K
3200K
4000K
6000K
A

4000K

76
Q

CRI Colour Rendering Index measures what?

A

How accurately a light source can replicate a desired set of parameters

77
Q 
Task lighting should be between what values?
10-50 lux
100-500 lux
300-700 lux
200 to 500 lux
A

200-500 lux

78
Q 
Ambient light hitting a front projection screen should be less than....
10 lux
20 lux
50 lux
100 lux
A

50 lux

79
Q 
How much of a dimmer's capacity should be used for incandescent light?
50%
75%
80%
100%
A

80%

80
Q 
How much of a dimmer's capacity should be used for flourescent light?
50%
75%
80%
100%
A

50%

81
Q 
As a general rule, the colout temperature setting on a camera should be set to what?
3000K
the colour temperature of the lighting
Daylight temperatures
Maximum
A

the colour temperature of the lighting

82
Q

What is the minimum grade fastener that you should specify?
SAE-2, ISO 4.6
SAE-5, ISO 8.8
SAE-8, ISO 9.8

A

SAE-5, ISO 8.8

83
Q

What does a block diagram illustrate?

A

Signal path through a system. Read left to right and top to bottom

84
Q 
What are the two methods of cooling a rack?
Normalization
Pressuration
Substration
Radiant
Evacuation
A

Pressuration and Evacuation

85
Q 
What is the maximum load for a breaker or circuit?
50%
75%
80%
90%
100%
A

80%

86
Q

What is the purpose of an isolated groud circuit?

A

Minimize buzz or hum caused by a problematic ground loop. Grounding is isolated from the receptacle mounting.

87
Q 
What is the most popular conduit in AV
Flex conduit
Intermediate conduit
Electrical Metal Conduit
Rigid Metal conduit
A

Electrical Metal Conduit

88
Q 
What are the allowable conduit fill percentages? 1, 2, 3+ cables.
30/60/90%
50/75/20%
53/31/40%
60/30/75%
A

53/31/40%

89
Q

When do Jam Ratios come into effect?

A

When installing 3 cables. Keep it away from 3

90
Q 
When should a junction box be specified?
After 100m
Every 90 degree bend
When exiting a room
Every 180 degrees
A

Every 180 degrees

91
Q

Which has a greater effect on the speed of sound
Altitude
Air temperature

A

Air temperature

92
Q

What is the speed of sound?
1000 ft/sec, 310 m/s
1130 ft/sec, 344 m/s
2000 ft/sec, 400 m/s

A

1130 ft/sec, 344 m/s

93
Q

Wavelength is..?

A

speed/frequency

94
Q

Can a diffuser work over all frequency ranges?

A

No. A diffuser of a specific size only works in a specific frequency range

95
Q

What is a flutter echo?

A

A series of reflections that continue to bounce back and forth between parallel hard surfaces.

96
Q

Is having room dimensions that are multiples of each other ok?

A

No. A cube is the worst

97
Q

The reverb time of a space (RT60) is what?
The time it takes for a wave to repeat itself
The time it takes sound to increase by 60dB

A

The time it takes for sound to decay 60dB.

98
Q 
Noise Reduction Coefficients of what are considered reflective?
Below 0.2
Above 0.2
Equal to 10dB
zero
A

Below 0.2

Above 0.4 are absortive

99
Q 
A Speech Privacy Rating of what is adequate.
0-20
20-40
40-55
55-65
A

40-55

100
Q

Does the Speech Privacy Rating apply to all sounds?

A

No, only the speech frequencies

101
Q 
If you want to quantify impact sound absorption of a material, which measurement do you use?
STC
IIC
FTP
NRC
A

IIC - Impact Insulation Class. 28-85, less absortive to more absortive

102
Q 
What is the sampling rate for an audio CD?
8kHz
44kHz
96kHz
1.2 MHz
A

44kHz

103
Q

What’s the trick for figuring out the bandwidth of 4:2:, 4:1:1, or 4:2:0?

A

For 4:4:4: it’s Horiz x Vert x bit x FPS x 3

Anything else it’s four fourths HxVxBxF + two fourths HVBF + two fourths HVBF etc

104
Q 
Which are the lossless codecs?
JPEG2000
H.264
MPEG-1
MPEG-2
VC-1
A

JPEG2000

H.264

105
Q 
Which are the lossey codecs?
JPEG2000
H.264
MPEG-1
MPEG-2
VC-1
A

MPEG-1
MPEG-2
VC-1

106
Q

What’s the difference between intraframe and interframe compression?

A

Intra compresses each frame individually, file sizes are larger. Lossless
Inter only send the difference between frames, files are smaller. Lossey

107
Q 
HDMI 1.4's bandwidth is:
5.4 Gbps
10.2 Gbps
16.4 Gbps
18 Gbps
A

10.2 Gbps

108
Q 
HDMI 2.0's bandwidth is:
5.4 Gbps
10.2 Gbps
16.4 Gbps
18 Gbps
A

18 Gbps

109
Q

How are HDMI and DVI similar?

A

HDMI is the same but with the addition of audio

110
Q

Which signal id TDMI and which is LVDS?

A

HDMI and DVI use TDMI

Display Port uses LVDS

111
Q

What does EDID do

A

EDID is how a sink describes its capabilities to a source to ensure they work together.

112
Q

What would you use to organize your EDID information?
Let the manufacturer do it
Let the control system manage it for you
Create a truth table

A

Create a truth table

113
Q 
When setting the gain structure, which one is set last?
Microphones
Audio mixer
DSP
Preamps
Amplifier
A

Amplifier

114
Q

Generally speaking what is the gain level range on microphones?

A

35dB to over 60dB.

Handhelds, 35 and the further you go out to the ceiling mic, over 60dB

115
Q 
Which network uses physical addresses to communicate?
LAN
WAN
PAN
Internet
A

LAN uses the MAC address of the device

116
Q

Can you place a device on more than one VLAN?

A

Yes

117
Q 
What is the purpose of a VLAN?
Increase network speed
Increase network stability
Segragate a network
Increase security
A

Segregate a network

118
Q

What is the purpose of Reserve DHCP?

A

It’s a method of reserve static IP adresses on a DHCP network

119
Q

What does Domain Name Service DNS do?

A

Translates a name into an IP address.

120
Q

Which transport protocol ensures data delivery?

A

TCP - Two way communication to ensure that all data arrived complete. Slower but guaranteed.
UDP just fires it across and doesn’t care if the data was received. Faster, used when real-time communication is required.

121
Q

What is the minimum bandwidth required by Dante?
10Mbps
100 Mbps
1000 Mbps

A

100 Mbps

122
Q 
When streaming on a network, what poercentage of the bandwidth should you expect to be alloted?
10%
21%
33%
50%
100%
A

21%

In a network, consider that only 70% of the total bandwidth is available, and that streaming can only use 30% of that.

123
Q

For these 3 uses, how much latency is acceptable?
Videoconferencing, Hi-fidelity audio, Streaming desktop video

50 milliseconds, 10 milliseconds, 3 seconds
200 milliseconds, 50 microseconds, 1 second
300 milliseconds, zero, 1 minute
10 milliseconds, 10 microseconds, 1 second

A

200 milliseconds, 50 microseconds, 1 second

124
Q

Multicast transmissions are always delivered by:
TCP
UDP

A

UDP, no exceptions

125
Q 
In network security what is the CIA triangle?
Control, Instantanious, Acceptance
Conception, Intermediate, Analysis
Confidentiality, Integrity, Availability
Constant, Internal, Area
A

Confidentiality, Integrity, Availability

126
Q 
At what stage of the project is it best to determine the customer's security needs?
Needs Analysis
Project Award
Installation
Sign off
A

Needs Analysis

127
Q

What is the triple-A of access control?
Always Allow Access
Abide, Abate, Arrange
Authentication, Authorization, Accounting

A

Authentication, Authorization, Accounting

128
Q 
When doing a risk analysis, what is the most common response?
Avoid
Accept
Transfer
Mitigate
A

Mitigate

129
Q

If you encounter conflicting regulations or codes, which one should be followed?

A

The most restrictive.

130
Q

In projection what contrast ration is needed for basic decision making?

7: 1
15: 1
50: 1
80: 1

A

15:1

7: 1 - passive viewing
15: 1 - basic decision making
50: 1 - analytical decision making
80: 1 - full motion video

131
Q 
How many viewing areas a used to determine the average contrast ratio on a screen?
1
3
5
9
A

5

132
Q 
What is the best method to determine if audio and video are synced?
Check the manufacturer's specs
Just eyeball it
Blip and Flash
Spoken word like a newscast
A

Blip and Flash

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