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CRST > Audio / Video > Flashcards

Audio / Video Flashcards

1
Q

ISDN uses ____ technology?
A) Only digital
B) Digital and analog
C) Only analog
D) neither digital or analog

A

Only digital

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2
Q

Maximum color depth of SVGA monitor?
A) 16million
B) 64k
C) 256
D) 1024

A

16 million

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3
Q

How many devices a DMX512 can support

A

32

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4
Q

What is the SMPTE speed for a NTSC color TV

A

29.97 frames per sec

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5
Q

What type of microphone is essentially a capacitor with one plate of the capacitor moving in respond to sound waves. usually requires a small battery to provide voltage across the capacitor.

A

Condenser microphone

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6
Q

A 120 ohm terminator is used in a DMX loop to

A

absorb reflected signals or reduce reflection interference

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7
Q

Advantage of using a 70 volt audio system

A

Less line loss

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8
Q

What amp configuration is best for high frequency operation

A

common emmitter

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9
Q

What is standard lighting control protocol

A

DMX512

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10
Q

In a DMX 512 channel, how many increments are required to go from 0 to 100%
A) 256
B) 512
C) 128
D) 1024

A

256

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10
Q

a phase locked loop might be used in a

A

TV tuner

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11
Q

You would expect to find a comb filter

A

in a tuner

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12
Q

Video convergence is a process of

A

aligning the different color electron beams so they overlay each other

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13
Q

DMX 512 uses what impedance standard

A

RS-485

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14
Q

A CRT’s refresh rate is important because it controls

A

flicker

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15
Q

What is the SMPTE speed for film

A

24 frames per second

16
Q

What is a ringing test used for television

A

test the transformer coil in the flyback and yoke

17
Q

Which of the following statements is true about DMX
A) it must be terminated with a 120 ohm resistor
B) it must be tapped back to the controller
C) it must be addressed to 255
D) it must be terminated with a 50 micro farad capacitor

A

it must be terminated with 120 ohm resistor

18
Q

What is the SMPTE video data transfer rate

A

80 bits per second

19
Q

What is the NTSC horizontal frequency for TV

A

15.7 KHz

20
Q

The correct way to install four 8 ohm speakers to one 8 ohm input is

A

connect 2 speakers in parellel in series with other 2 more speakers in parellel

21
Q

power supply has an internal source resistance of 10 ohm. What value of DC load resistor results in the maximum power transfer

A

10 ohm

21
Q

When you increase the gain of an amp you automatically

A

decrease the bandwidth

22
Q

24 frame timecode is used for

A

film

23
Q

increase of 3db will ___the power of the audio signal

A

double

24
Q

An amplifier generates a completely new output signal based on?
A) input signal
B) the gain
C) resonant frequency
D) the gain

A

the input signal

25
Q

On a 70 volt audio system, one speaker out of a chain of speakers needs to be louder. This is accomplished by ___?

A

Changing the tap on the transformer

26
Q

A CRT’s grid voltage can be as high as

A

15000 volts

27
Q

Have a 70 volt audio system with a 350 watt amp. How many speakers can be connected if all speakers are tapped at 5w

A

70 speakers

28
Q

What is the vertical frequency of a standard NTSC composite signal

A

60 Hz

29
Q

How do you create a raster?

A

electron beam scanned rapidly from left to right and top to bottom

30
Q

The audible audio freq range is from ____to ___

A

20 Hz - 20KHz

31
Q

Disadvantages of a 70V system?

A

Limited frequency response, limited to 250 Watts

32
Q

Video display that paints a complete picture on the screen in one pass is?
A) non-interlaced
B) LCD
C) gas Plasma
D) interlaced

A

non-interlaced

33
Q

NTSC signals are transmitted in?
A) AM (Video signals)
B) VM
C) IR
D) FM (audio Signal)

A

AM (Video Signal)

34
Q
A

CRST (6 decks)

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