Why must cables and wires be identified?

1 Answer

Answer :

To provide the technician with a means to trace the wires when  troubleshooting and repairing electrical and electronic systems.

Related questions

Description : What is the most common type of nonmetallic material used to protect wires and cables?

Last Answer : Fibrous Braid.

Description : When should wires be twisted prior to lacing?

Last Answer : When required, such as for the filament leads in electron tube amplifiers.

Description : What is the most common method of terminating and splicing wires?

Last Answer : The use of preinsulated splices and terminal lugs

Description : What two methods of manufacture are being used to eliminate bonding wires?

Last Answer : Flip-chip, beam lead

Description : How is the collector lead identified on an oval-shaped transistor?

Last Answer : By the wide space between the collector lead and the other two leads (emitter and base)

Description : Rotation of an rf-feed source to produce a conical scan pattern is identified by what term?

Last Answer : Nutation.

Description : The distance from a radar set to a target measured along the line of sight is identified by what term?

Last Answer : Range.

Description : What precautions should you take when tying bundles containing coaxial cables?

Last Answer : Do not tie too tightly and use the proper type of tape.

Description : Why are splices staggered on multiconductor cables?

Last Answer : To prevent the joint from being bulky.

Description : OFCC, stranded, and ribbon cables have different fiber worst bend performance?

Last Answer : Ribbon.

Description : When is an optical power meter measurement recommended for conducting field measurements on installed optical fiber cables or cable plants?

Last Answer : When an installed optical fiber cable or cable plant is less than 50 meters in length.

Description : Optical fibers or cables should never be bent at a radius of curvature smaller than a certain value. Identify this radius of curvature

Last Answer : Minimum bend radius.

Description : What are the three types of lead-sheathed cables?

Last Answer : Alloy lead, pure lead, and reinforced lead.

Description : What is the main disadvantage of using fiber-optic cables?

Last Answer : High attenuation.

Description : What instrument is used for measuring the insulation resistance of cables?

Last Answer : Megohmmeter (megger).

Description : In the illustration, the tan and white wires are connected to the solenoid valve. The solinoid valve is_________. EL-0043 A. in the liquid line before the TXV B. energized and open whenever the unit ... so the unit must be modified before using aboard ship D. the water inlet for the ice maker

Last Answer : Answer: D

Description : In the illustration, the tan and white wires are connected to the solenoid valve. The solenoid valve is_________. EL-0042 A. in the liquid line before the TXV B. energized and open whenever the unit ... so the unit must be modified before using aboard ship D. the water inlet for the ice maker

Last Answer : Answer: D

Description : Once the project is approved and moves into the planning stage, what happens  in the next phase of the project life cycle? Select one: a. Agreements for risk sharing need to be concluded. ... activities. e. A risk response plan can be used to identify increasing levels of detailed risk analysis

Last Answer : d. Risks are identified with each major group of activities.

Description : Once the project is approved and moves into the planning stage, what  happens in the next phase of the project life cycle? Select one: a. Agreements for risk sharing need to be concluded. ... activities. e. A risk response plan can be used to identify increasing levels of detailed risk analysis

Last Answer : d. Risks are identified with each major group of activities.

Description : Which of the following is not a criterion for successful market segmentation? a. there must be difference among consumers b. each segment must be located within a geographical area c. there must be consumer similarities within each segment identified d. a segment must be large enough to cover costs

Last Answer : a. there must be difference among consumers

Description : Which one of the following is not a part of Koch s postulates? a. The microorganism must be isolated from a dead animal and pure cultured b. The microorganism and disease can be identified from ... a healthy susceptible animal. d. The same microorganism must be present in every case of the disease.

Last Answer : d. The same microorganism must be present in every case of the disease.

Description : Which of the following is not true about stratified random sampling? a. It involves a random selection process from identified subgroups b. Proportions of groups in the sample must ... subgroup comparisons are to be done d. Proportional stratified random sampling yields a representative sample

Last Answer : D. Make the sample as large as possible

Description : Which of the following statements concerning electrical cables is correct? A. Where they pass through watertight bulkheads, they should be fitted with watertight stuffing boxes. B. Electric cable coverings should ... , or glued in place where nonmetallic insulation is used. D. All of the above.

Last Answer : Answer: A

Description : All electric cables passing through watertight bulkheads must be _____________. A. installed with watertight stuffing tubes B. grounded on both sides of the bulkhead C. fitted with unions on each side of the bulkhead D. welded on both sides of the bulkhead

Last Answer : Answer: A

Description : When electrical cables penetrate watertight bulkheads, _______________. A. they should be grounded on either side of the bulkhead B. they must be bent to a radius of six diameters C. a watertight stuffing tube capable of accepting packing should be employed D. they should be secured by a clamp

Last Answer : Answer: C

Description : What type of flux must be used in all electrical and electronic soldering?

Last Answer : Noncorrosive, nonconductive rosin fluxes.

Description : Why must items to be soldered be cleaned just prior to the soldering process?

Last Answer : Solder will not adhere to dirty, greasy, or oxidized surfaces.

Description : A waveguide bend must have what minimum radius?

Last Answer : Greater than 2 wavelengths.

Description : When a waveguide is terminated in a resistive load, the load must be matched to what property of the waveguide?

Last Answer : . Characteristic impedance.

Description : For an electric field to exist at the surface of a conductor, the field must have what angular relationship to the conductor?

Last Answer : The field must be perpendicular to the conductors.

Description : . What primary condition must magnetic lines of force meet in order to exist?

Last Answer : Magnetic lines of force must form a continuous closed loop.

Description : What kind of material must be used in the construction of waveguides?

Last Answer : Conductive material.

Description : What safety precaution must be taken before replacing a transistor?

Last Answer : The power must be removed from the circuit.

Description : What must be done to a circuit before you can use an ohmmeter for testing?

Last Answer : It must be de-energized.

Description : An instrument thAn instrumAn instrument that must be calibrated in place requires what type of calibration label?

Last Answer : SPECIAL CALIBRATION label.

Description : What calibration label is used when actual measurement values must be known to use the test equipment?

Last Answer : CALIBRATED—REFER TO REPORT.

Description : To increase the magnitude of a number by 23, you must shift the number how many times and in what direction?

Last Answer : Three to the left.

Description : What logic levels must exist for the FF to be toggled by the clock?

Last Answer : Both J and K must be HIGH.

Description : What condition must occur to have a change in the output of a D FF?

Last Answer : A positive-going clock pulse.

Description : For an R-S FF to change output conditions, the inputs must be in what states?

Last Answer : 1 and 0, or opposite states.

Description : To sort a data file, what must you tell the sort program?

Last Answer : What data field or fields to sort on.

Description : The output of the sum point must contain information that controls what two factors of load movement in a position servo?

Last Answer : Amount and direction of rotation.

Description : What must be used to test an activated circuit?

Last Answer : Approved meters or other indicating devices

Description : What safety precaution must you observe when soldering or hot-wire stripping fluoroplastic insulated wire?

Last Answer : Adequate ventilation.

Description : Why must a wiring diagram be used in conjunction with a schematic to troubleshoot a system?

Last Answer : To find the test points.

Description : What are the two main sources of emi with which radio waves must compete?

Last Answer : Natural and man-made interference.

Description : What three factors must be considered in the transmission of a surface wave to reduce attenuation?

Last Answer : (a) electrical properties of the terrain (b) frequency (c) polarization of the antenna

Description : When measuring receiver sensitivity, what quantities must you add to the dBm reading obtained on the signal generator or test set?

Last Answer : Attenuations of the directional coupler and the connecting cable.

Description : To propagate energy down an arm of a hybrid ring duplexer, the two fields at the junction of the arm and the ring must have what phase relationship?

Last Answer : 180 degrees out of phase