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Texas-Low Voltage Online Practice Test

These are actual questions from our online practice test.

We have included a question from each chapter of the test. Every question will be multiple choice. The answers are not included with the sample.

Sample Questions

# Chapter Title Question
1 Conductors, Telephone Lines and Jacks

A Cat 6 cable uses what type of jack?

2 Fiber Optics _________________ is the phenomenon in which the phase velocity of a wave depends on its frequency, or alternatively when the group velocity depends on the frequency.
3 Computers, Satellite Dish, Transmission Systems and Communication Circuits All TV satellites rotate in the _____ orbit.
4 Circuits The flow of electrons and tiny atomic particles is referred to as ___________________.
5 Conduits, Voltmeters, Ammeter and Ohmmeter Plenum rated cable for CATV is marked with?
6 Wiring UBC requirements for residential buildings limit openings betweem balustrades to less than ________ inches.
7 Cable Installation ______________ connectors are a variant on BNC that carry a signal and guard as well as ground conductor. These are used in sensitive electronic measurement systems.
8 Circuits, Conduit, Conductors and Installation of Low Voltage Systems Having an 18 gauge, Class 1 circuit conductor, the over current protection should not exceed _______ amps.
9 Cable and Phone Installation Systems In beginning a communications project, the number one priority is to ensure that all the ______________ are done correctly.
10 Conductors, Cables and Grounding The reference level for voltage levels within a system is usually referred to as ________________.
11 Topology, Cable Specification and Telecommunications _________________ is the mathematical study of shapes and spaces. It is a major area of mathematics concerned with the most basic properties of space, such as connectedness, continuity and boundary. It is the study of properties that are preserved under continuous deformations including stretching and bending, but not tearing or gluing.
12 PA Systems and Installation _____- gauge to 22- gauge is usually more than adequate to handle the necessary amount of current for a given application.
13 Telecommunications Cross Talk A delay line based on the time of propagation of electromagnetic waves is considered to be an _________________________.
14 Home Theater and Installation The logical system hub for a practical home theater is the audio/video receiver or the __________ receiver.
15 Antenna's A _____________ is a separation of positive and negative charges.
16 Troubleshooting

How is power limited fire alarm cable marked?

17 Wiring and Raceways Regarding telephone wiring components, the conductors in telephone wires should be solid copper with a 22 AWG minimum and at least ______ insulated conductor wires. These wires should be colored green, red, black and yellow or standard coding.
18 Wiring Requirements and Wire Characteristics The acronym OEM is in reference to _____________________.
19 Security Systems Alarms and CCTV Systems Shunt resistors, being very low in resistance, are usually made from relatively large masses of metal. Their precise resistance is calibrated through a process known as trimming, where a technician takes a metal file and "trims" metal from the shunt conductor until the resistance reaches its correct value. This, of course, only works if the shunt resistor is intentionally manufactured with a resistance that is too low. Like the old carpenter's joke goes, Ï cut the board twice and it's still too short!" Being that shunt resistors have such incredibly low resistance values, how do we measure the resistance of a shunt with high accuracy during the "trimming" process? The resistance of a shunt is far too low for an average handheld or even benchtop ohmmeter to measure with precision, and specialized low-resistance ohmmeters such as the Kelvin Double Bridge are quite expensive. If you were given the task of trimming a shunt resistor for use in an ammeter, and you only possessed average pieces of test equipment, how could you do it?
20 Security Systems and Alarms The threat of personal risk or bodily injury and the possible loss of ______________ is the best consideration in determining the amount of protection needed in choosing what will be the best security system.
21 Commercial Security Systems The acronym NEC is in reference to the ____________________________.
22 Protected Premises Fire Alarm Systems Every low power radio transmitter will automatically repeat alarm transmission at intervals not exceeding __ seconds until the initiating device is returned to it s nonalarm condition.
23 Emergency Control Functions and Interfaces Shall magnetic door holders that allow doors to close upon loss of operating power be required to have a secondary power source?
24 Single and Multiple-Station Alarms and Household Fire Alarm Systems What are flame detectors not intended for?
25 OSHA, Dig Alert, Safety, Asbestos, Code of Federal Regulations, Title 29, Part 1926 and Fire Extinguishers

Member utilities will attempt to respond within 2 hours in case of emergency but have 48 hours, the contractor may responsible for any damages caused.

26 Basic Bid Preparation and Estimating How is gross profit figured?
27 Employees, Contractors, Insurance and Safety What is required to be worn by employees and contractors at all times to minimize forces transmitted to the head, neck, spine, from falling objects?
28 Mathematics, Calculations and Formulas

When the 5 k potentiometer in this circuit is set to its 0%, 25%, 50%, 75%, and 100% positions, the following output voltages are obtained (measured with respect to ground, of course): 
 


 

At 0% setting, Vout = 0 V
At 25% setting, Vout = 2.5 V
At 50% setting, Vout = 5 V
At 75% setting, Vout = 7.5 V
At 100% setting, Vout = 10 V


Calculate what the output voltages will be if a 1 k? load resistor is connected between the "Vout" terminal and ground: 
 


 

At 0% setting, Vout =
At 25% setting, Vout =
At 50% setting, Vout =
At 75% setting, Vout =
At 100% setting, Vout =


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