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VDV PRACTICE TEST 1 (CCTV FOCUSED)
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VDV PRACTICE TEST 1 (CCTV FOCUSED)
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VDV PRACTICE TEST 1 (CCTV FOCUSED)When installing a CCTV system,what equipment is required to make the system work. -
ANS-camera, lens, transmission link, monitor
Two (2) 12V 60A batteries are connected in parallel, the output would be. - ANS-12V
120A
The formula used to find resistance is. - ANS-R= E / I
What is the unit of measurement used when measuring loss/gain in a coaxial system? -
ANS-dB
Category 5 cables exhibit __________ attenuation than category 3 cables. - ANS-lower
What is the minimum voice cabling type for a residential application? - ANS-4-pair,
category 3
A technician must install a 24 volt power supply for a CCTV camera. What type of
power supply must he install? - ANS-he should forget about overcurrent protection and
install a Class 2 power supply
It is permissible to strap cables to the ceiling grid when________? - ANS-cables shall
not be supported by ceiling grids.
Given an area with the following dimensions L 180' x W 100' x H 8' , what is the square
footage? - ANS-18,000 Sq. Ft.
When installing an access control system, an anti-passback feature would be used to
prevent ______________. - ANS-an entrant from passing their card to the person
behind them.
Low Voltage systems are not capable of electrocution due to the fact that _______. -
ANS-Low voltage systems can cause electrocution
When working on ladders, you should not extend your body beyond the rails, this
commonly called: - ANS-the "belt buckle" rule
, The main cause of job-related eye injuries is __________. - ANS-flying objects or
particles
What type of lens would be used with a pan & tilt mount to follow individual cars as well
as cover a large parking lot? - ANS-motorized zoom auto iris
The maximum recommended length for a single-section ladder is ________ feet? -
ANS-30
the total opposition to the flow of electrons is ___________? - ANS-both a & c
The ABC's of CPR are: - ANS-airway, breathing, circulation
To which zone on a burglar alarm would an exterior door contact be wired? -
ANS-perimeter
According the NEC, metal cable trays and wireways _________ bonded to ground. -
ANS-shall be
Which of the following is a common use for a distributed sound system?
A
background music
C
room stereo systems
B
intercoms
D
all of the above - ANS-D
Loudspeakers that operate below 300 Hz are called ________. - ANS-subwoofers
The _________ the impedance of the path, the __________ the current that will flow
through the overcurrent device. - ANS-lower / higher
What device is used to boost a weaker audio signal to a level suitable for further mixing
and signal processing? - ANS-preamplifier
A ________ is used to measure optical power. - ANS-power meter
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