Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
3E051 set D book 2
| Question | Answer |
|---|---|
| Which of these items is not a part of a DC motor? | Stator |
| In a DC motor, how are coil ends from the armature widings attached to the riser? | soldered |
| The DC motor with the highest starting torque is the | series motor |
| The DC shunt motor connects the field coils and armature in | parallel |
| What part of a three-phase motor is connected to the supply voltage? | stator |
| The component of a three-phase motor connected to the load is the | rotor |
| The magnetic field of a tree-phase motor rotor is caused by | current flow in the rotor |
| Which motor would have the highest revolutions per minute (rpm) if each were connected to the same power supply? | 4-pole motor |
| The internal windings of all three-phase motors are | either wye or delta connected |
| Which of the following features describes three-phase motors best? | either single or dual voltage motors |
| The motor that requires some starting means is the | single phase AC motor |
| A centrifugal switch is used in a single-phase motor to | de-energize the start windings |
| The squirrel-cage windings has high-inductive reactance and is placed beneath the | wound rotor section |
| A single-phase motor with external leads numbered T1, T2, T3, T4 is what type? | dual voltage nonreversible |
| What should you connect to operate a single-phase dual-voltage motor on high voltage? | run windings in series |
| How many basic types of across-the-line motor controls are there? | two |
| The basic types of overload relays are | thermal and magnetic |
| The methods used to open the contacts on an across-the-line magnetic controller are | spring tension and gravity |
| What type of motor enclosure is designed to prevent liquids or solids from entering it except at indirect angles? | Splash proof |
| What type of bearing shoulf be used in a vertically-mounted motor? | ball or roller |
| When you clean a motor compressed with air, what is the maximum air pressure to use? | 25 PSI |
| What should be your first check on a motor that seems to be overheating? | ventilation |
| If a motor has been operating normally but suddenly stops, you should suspect | electrical overload |
| The end play of a motor should not exceed | 1/64 of an inch |
| An indication of an open rotor in a squirrel-cage motor is | the motor slowing down under load |
| A motor that operates slowly may have a | deficient voltage supply |
| Motor voltage must be within what percent of the voltage rating? | 10 |
| A wood working shop would constitute what class of electrical hazard? | Class III |
| Electrical equipment used in class I locations must be | explosion-proof |
| Sparkproof electrical equipment must be used in what class locations? | class III |
| Which of these wiring methods is permitted in class I, division 1 hazardous locations? | mineral-insulated cable |
| To prevent explosion materials from passing from one part of an explosion-proof conduit system to another, you should use | sealing compound |
| Before working on electrical system, you always should | deenergise the power to the circuit |
| A proper fit between an enclosure and its cover is achieved by | flat ground-joint surfaces |
| When you work ina Class I hazardous location, you should use all the equipment listed below except | non-sparking metal hand tools |
| If work must be done on equipment exposed to hazardous material, the equipment should be | cleaned and tagged |
| How long must the power supply to an emergency light be able to supply voltage? | 1.5 hours |
| According to the NEC, the wiring for emergency lighting system must be | independent of the regular wiring used for appliances |
| How often should a total discharge of emergency-light batteries and recharge be done? | every six months |
| If an emergency light battery will not hold a charge, what should you do to it? | replace |
| The electric range produces heat by | passing current through a resistor |
| What is the most desirable water heater temperature control setting for general purposes? | 150 |
| To prevent others from tampering with switches, you will | lock and tag them |
| If you check a heating element and the ohmmeter reads "0" ohms, the elements is | good |
| A signal head may have a maximum of how many signal faces? | 5 |
| The most common types of detectors for traffic control are | pressure and loop |
| Which of the following do you use on a traffic control system? | FM |
| The controller operates loop and lead-in systems whose total inductance is between | 20 and 70 microhenries |
| Most repairs made in the controller cabinet of a traffic control system are made by replacing | a module or circuit board |
| At least how many hours of backup power should you have on a traffic controller RAM? | 30 hours |
| What is the minimum mounting clearance required for the signal head? | 15 feet |
| The purpose of the motor on a siren for a base warning system is to rotate the siren | 360 degrees |
| Which organization is responsible for turning on the base warning siren? | Command post |
| Your first step in troubleshooting the base warning system should be to check the | control circuit |
| Voltage being present on the load side of the controller on a base warning system means the | controller is fully operational |
| What type of process is corrosion? | Electrochemical |
| The ions that leave the metal and enter into solution are | positive |
| How many basic forms of corrosionare there? | 4 |
| Where does stray current corrosion cause greatest damage? | where it exits a structure |
| At least how many inches of backfill should extend from each end of an anode? | 12 |
| How often should a structure be checked for depth of pitting? | yearly |
| The basic guidance for completing maintenance actions sheets is in the | AFI 32-1001 operations management |
| How often must you maintain AF Form 491, Cathodic Protection Operating Log for Impressed Current system? | 60 days |
| To protect steel or cast-iron structures, what should the voltage reading be between the struture and a saturated copper-copper sulfate half-cell contacting the electrolyte? | -0.85 volts |
| One of the most important measurements made in Cathodic Protection is the single rod probe measurement of the soil reistance between what two points? | structure-to-electrolyte potential |
| What meter should you use to make a structure-to-electrolyte measurement? | high-resistance voltmeter |
| What is the basic unit of conductivity for water resistivity? | ohms per centimeter |
| After the initial series of cathodic protection of a galvanic anode system is established, during the first year, how often should the system be checked? | quarterly |
| An above-normal potential between the half-cell electrode and the anode under test shows | that the anode is corroded away |
| The two classifications of fire alarm systems are the local and | central stations |
| Fire alarm reference material shoulf be maintained in the | fire department technical services office |
| When troubleshooting fire alarm systems, where do the most frequent problems occur? | wire termination points |
| What are the two main classes of intrusion detectors? | point and area |
| Repair and intrusion detection systems should always be done in accordance with? | UFC 3-600-02 |
Created by:
melissafish
Popular Military sets