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 2-2
Set 2 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 windings 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 three phase motor rotor is caused by | Impedance of the stator |
| Which motor would have the highest RPM if each were connected to the same power supply | 4 pole motor |
| The internal windings of all three phase motors are | Either wye ore 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 use in a single phase motor to | Deenergize the start windings |
| The squirrel cage winding 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 | Five |
| The basic types of overload relays are | Thermal and magnetic |
| The methods used to open the contacts on a 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 should be used in a vertically mounted motor | Ball or roller |
| When you clean a motor with compressed 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 | 1/64th of and 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 woodworking 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 explosive materials from passing from one part of an explosion proof conduit system to another, you should use | Sealing compound |
| Before working on an electrical system you should always | Deenergize the power to the circuit |
| A proper fit between an enclosure and its cover is achieved by | Flat ground joint surfaces |
| When you work in a 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 1/2 hours |
| According to the NEC, the wiring for emergency lighting systems 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 month |
| 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 degrees F |
| 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 element 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 micronhenries |
| Most repairs made in the controller cabinet of a traffic control system are made by replacing | Burned out bulbs |
| At least how many hours of backup power should you have on a traffic controller random access memory | 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 corrosion are there | Four |
| Where does stray current corrosion cause greatest damage | Where it exits a structure |
| At least how many inches of back fill should extend from each end of the anode | 12 |
| How often should a structure be checked for depth of pitting | Every two years |
| The basic guidance for completing maintenance action sheets is in | 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 structure and a saturated copper copper sulfate half cell contacting the electrolyte | -0.85 volts |
| One of the most important measurements made in cathodic protection (CP) is the single rod probe measurement of the soil resistance 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 CP 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 station |
| Fire alarm reference material should 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 detetors | Point and area |
| Repair of intrusion detection systems should always be done in accordance with | Manufacture's specifications |
Created by:
10205686990093402
Popular Military sets