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| an alternating voltage is applied to a capacitor, as the frequency of the voltage is increased the impedance of the capacitor does what |
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| the term hertz means the same as? |
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| in an electrolytic condenser, the dielectric material is |
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| a transformer will step up or down a voltage is determined by its |
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| lead plate storage battery uses what type of electrolyte |
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| MAIN function of a filter in a power supply is to? |
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| smooth out the peaks of the frequency |
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| speed of a synchronous motor is controlled by |
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Definition
| the frequency of the alternating current applied to it |
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| capacitance of a condenser is measured in? |
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| power lost in a 20 ohm resistor with .25 amps pass through it is? |
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| always protect transistors from heat |
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| commutator of a motor should be lubricated or not? |
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| band of wavelengths of visible light |
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| heat reach the earth from the sun is caused by? |
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| resistor with negative temp coefficient |
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| in an ac circuit the power factor is? |
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| ratio of the resistance to the impedance |
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| what is milli-roentgen a unit of? |
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| type of fuse for protecting initial surge amperage that is beyond its capacity |
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| degrees kelvin is numerically equal to |
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| micromicrofarads, prefix micromicro means 10 to what power |
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| laminated steel or iron is used instead of solid metal in construction of the field and armature cores in motors and generators because? |
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| reduce eddy current losses |
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| reversing the polarity of the voltage on a mica condenser will do what? |
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| in a three phase y connected ac power system the voltage from leg to ground is 120. what is the voltage between each pair of hot legs |
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| instrument that measures humidity |
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| impedance ratio of a transformer varies __________ the turns ratio |
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| what type of equipment is used to obtain more than one voltage from a fixed voltage direct current source |
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| resistance-type voltage divider |
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| ratio of peak to effective _rms) voltage value of a sine wave is |
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| two coils connected in series. If there is no mutual unductance between the coils the TOTAL inductance of the two coils is the |
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| sum of the individual inductances |
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| impedance of a coil with zero resistance is called |
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| ratio of the energy stored to the energy lost in a coil over a period of one cycle is called its |
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| ratio of the energy stored to the energy lost in a coil over a period of one cycle is called |
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| in a vacuum tube the current is carried by |
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| device used to vary the intensity of an incandescent light on a 120v ac circuit is called |
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| silicon controlled rectifier |
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| highest conductivity between, iron,zinc,copper,silver |
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| last band on resistor is gold. this means what |
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| when an amplifier has an output voltage waveform that does not exactly follow the input voltage, this type of distortion is caled |
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| 1000khz parallel cirquit has its value of capactiy doubled and its value of unductance halved. what is its khz |
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| what is not normally used in dc electrical circuits |
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| how many 120 volt bulbs can you use in 600volt line |
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| what type of motor has no brushes (answer is not brushless) |
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| squirrel cage induction has no brushes |
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| name a common heating element |
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| what measures insulation resistance of rubber covered electrical cable |
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| when bending 2 inch conduit use what type of tool |
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| measure gaps in a relay with? |
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| you measure state of charge in a lead acid battery with a? |
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| what gears transfer power at right angles (uses 2) |
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| what do you ground service electrical equipment on in a building? |
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| the cold water line entering building |
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| induction motor is only type that can operate on on ac current |
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| filter capacitors have a rating given in? |
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| resistor and capacitor wired ina circuit help to reduce what? |
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| magnetic energy induced by inductance can cause? |
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Definition
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| highest conductivity between, iron,zinc,copper,silver |
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Definition
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Term
| last band on resistor is gold. this means what |
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Definition
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Term
| when an amplifier has an output voltage waveform that does not exactly follow the input voltage, this type of distortion is caled |
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Definition
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Term
| 1000khz parallel cirquit has its value of capactiy doubled and its value of unductance halved. what is its khz |
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Definition
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Term
| prefix kilo means to multiply by |
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Definition
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| prefix milli means to divide by |
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| 1 inch equals how many cm |
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| a circle has a radius of 10 inches and a circumference of what? |
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| triangle formula for area |
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Definition
1/2 base times the height
ie one side is 3" and other is 4" then square inches in area is 6 |
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| the advantage of a vacuum tube voltmeter over a regular voltmeter is? |
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Definition
| has a high input impedance |
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| a gm tube tester measures a vacuum tubes |
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| a cathode ray tube is used in? |
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| voltmeter is described as having 1000ohms per volt. current required to cause full scale deflection is? |
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Definition
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| what is primary use of a test oscilloscope |
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Definition
| analyze complex waveforms |
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| a lightmeter used in measuring incident light gives readings in |
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| a selenium photocell is a type known as? |
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| in wiring electronic circuits the solder generally used is |
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| portable ac equipment is equipped with 3 wire cable and 3 prong male plug. this is because? |
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| a match should not be used when inspecting electrolyte level in a lead acid battery due to |
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Definition
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| an alternating voltage is applied to an inductance. as the frequency of the voltage is decreased the impedance of the inductance... |
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Definition
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| the electrolyte in a carbon zinc dry cell is? |
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| a 5000ohm resistor has a voltage of 25 volts applied to it. the current draw is? |
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| red gray and yellow resistor |
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| fyi the word components was referring to plate current vectors |
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| creosote is used with wood to? |
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Definition
| a pipe fitted with base plate at each end |
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| The conductors in a large lead covered telephone cable are usually |
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Definition
| solid and paper insulated. |
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| To measure the power taken by a dc motor you should use what type of instrument |
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Definition
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| the power factor of a AC circuit containing both a resistor and condenser is |
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Definition
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| what is a circular a measure of? |
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Definition
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Term
kirchkoffs law
Junction Rule |
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Definition
| The sum of the current flowing into a junction is equal to the sum of the current flowing out of the junction. |
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| cloth tapes should not be used when accurate measurements must be obtained because? |
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Definition
| small changes in the pull on the tape will make considerable difference in tape readings |
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Definition
| structural steel member to support wall above a door and window openings |
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| properly ignite an oxyacetylene cutting torch |
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Definition
| open acetylene valve, spark up, open oxygen |
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| two coats of paint becuase? |
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Definition
| any missed areas will be easier to spot |
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| manilla hoisteing rope ends are what? |
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Definition
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| splices in columns in steel construction are usually made? |
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| two feet above floor level |
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| a megger is calibrated to read? |
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| circular mil is a measure of |
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| circuit containing only resistance has a power factor of 100% |
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Definition
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| how many fuses for a three phase four wire branch circuit with grounded neutral |
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| steel is a common dry cell electrode |
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Definition
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| if two supply wires to a dc series motor are reversed the motor will? |
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Definition
| run in the same direction |
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| the rating 125v -10a and 250v -5a refers to which component |
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Definition
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| fyi dc motors have commutators |
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| mica is commonly used as an insulation |
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Definition
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| voltmeter has the highest resistance in that diagram...1000ohms resistance dummy |
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Definition
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| a good magnetic material is |
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Definition
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Definition
| insulating and can be machined to a required shape |
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