VDV Study Guide v1.0

अब Quizwiz के साथ अपने होमवर्क और परीक्षाओं को एस करें!

additional manual fire boxes shall be so the travel distance to the nearest fire alarm box will not be farther than

200 ft

What is the delay time for ground fault trouble at the main panel?

200 sec

How many feet over the edge shall extension ladder extend?

36" or 3'

A ceiling shall be treated as smooth if the beams project no more than how many inches below the ceiling?

4 inches

After batteries have discharged one full cycle, how many hours do you have to recharge?

48 hours

Unlisted Nonconductive Optical fiber cables are permitted to be installed in a building where the length of the cable does not exceed

50 ft

Where practicable, a seperation of how much distance shall be maintained bewtween communications wires and cables on buildings and lightning conductors?

6 feet

What type of termination for voice application?

66 Block

Where to use bridging clips?

66 block

In communication circuits a bonding jumper shall be used to connect the communicating grounding electrode and power grounding electrode system by a wire not smaller than

6awg (800.100(d))

What best describes signalling line circuit?

A circuit over which multiple input & output signals are carried

For class 2, which portions of abandoned cable shall be removied if not tagged for future use?

Accessible portion

First step on finding resistance using a multi-meter?

Disconnect power (de-energize)

GFCI used for safety on a jobsite can not be

Electrical Cord

Where can you find MSDS? (Material safety data sheet)

Employer

What connector is used for satellite?

F-type

The location of the circuit disconnecting means shall be permanently identified at the

Fire alarm center unit

Cold wind exposed to skin will cause

Frost bite

Purpose of notification appliance device for fire alarm system?

Get building occupants attention

For series circuit involving 240v load and 5ohms resistor, find current

I = E/R = 240V/5ohms = 48 amps

What meter does not detect open or short?

VFL

What statement does not apply to voltage marking?

Voltage marking have to be 1/2" from voltage marking. 820.179(F)

Whatt can be determined by observing the direction of current flow through a circuit?

Voltage polarity

Where the communications cable enters a building, the metallic sheath members of the cable shall be the grounded or interrupted by a

insulating joint [800.93(a)]

Circuit integrity cable is estimated bya minimum fire resistance rating of how many hours?

2 hours

dB is a ratio of

2 quantities

What prevents equipment from cooling down?

DUST

Maximum untwist at connector of CAT 5E

.5 inch (13mm)

Smooth ceilings shall have a detector located within how many times the selected spacing?

0.7 times

How far should you be from powerlines when working on a boom lift

10 ft

how long should a water pipe be burried to be used as a grounding pipe

10 ft

Activation time of alarm notification appliances shall be within how many seconds after actication of an initiating device?

10 seconds

Total sound pressure level with all audible notification appliances operating shall not exceed what DBA at the minimum hearing distance?

110 dBa

What is the minimum size grounding conductor of a community antenna television system?

14 awg

Wall mounted telephone applicance or related firemans phone jack shall be mounted no higher than?

1680mm (66in)

What is the minimum size of a class 3 conductor?

18awg [725.170(h)]

Fire alarm systems shall be provided with at least how many independant& reliable power sources?

2

What is not needed for focal length

Area

In a community antenna television system, what is a permitted substituton for CATVP cable?

BLP

In antenna television system, what is a permitted substitution for CATVP cable?

BLP

Best connector for surveillance systems?

BNC

What type of connector to use for CCTV?

BNC

Which connector for CCTV is used to terminate both sides?

BNC

Dynamic Range means?

Between the loudest & quietest portion of a program in decibels

What system uses a one piece pass through system

Bixby or Bix

What listed cable is used for dwelling?

CATVX

What is the cable marking for Class 3 plenum?

CL3P

Hierarchy of cables

CMP>CMR>CM>CMG>CMX [820.154(B)]

Four components required for a cctv system

Camera, lens, transmission media, and monitor.

What does the acronym for CRT stand for?

Cathode Ray Tube

What info is not on TR plan?

Ceiling info

Which of the following statements is correct regarding the support of communication cables?

Communications cables should not be strapped, taped or attached by any means to the exterior of any conduit or raceway as a means of support.

What was the best method to terminating copper?

Compression

What date do batteries have to have on a booster panel?

Month/Year/Manufacturer

What type of detector is microwave?

Motion sensor

Which type of cable is permitted substitution for OFNP?

NONE

Which type of optical fiber cable is listed as being suitable for use in ducts?

OFNP

What type of plan would you use to troubleshoot?

Point-to-Point

What happens if you put a multimeter across a load on a de-energized parallel circuit?

Reading will be resistance

What hinders the flow of current through a circuit

Resistance

How do you measure cable length?

TDR (Time domain reflectometer)

Backbone cables does not provide interconnection for?

Telecommunication outlets

When you are sound masking, what is white noise used for?

To produce ambient noise

What is the rule for current in parallel circuit?

Total current is equal to the sum of the current through all branches.

Radiant energy detectors shall be categorized as

flame-detector

What is the final step in certification testing?

saving each test

Video signal carry 3 types of signal brightness, color and

synchronization

What is not used for pulling & installing cable?

vacuum


संबंधित स्टडी सेट्स

Chapter 3: Ebusiness: Electronic Business Value

View Set

Organizational Behavior Quizzes for Exam 1

View Set

Health Insurance: Chapter 6 (Underwriting) - Test Cram Session

View Set

Module Four- Postmodern and cultural criminology

View Set

MQM 220 Final Exam Study Guide (ISU Fall 2017 Ruszkowski)

View Set