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when a cam or vane is moved close to a magnetic levleing switch what occurs? - ANSWERSthe switch changes its satate what is meant by the normal state of relay contacts? - ANSWERScontact state without current applied to the coil what type of wave form is generated by two pole ac generator in one complete revolution? - ANSWERSone full AC cycle what defines the the period of a ac waveform ? - ANSWERSthe time it takes to complete one full cycle . what is the period of a 120 hz - ANSWERS.00833 seconds a sine wave beginning at 0 degrees will reach positive and negative peaks at what two points ? - ANSWERS90 and 270 degrees what is it meant by the term peak to peak voltage ? - ANSWERSvoltage between positive and negative peaks the expression 0.636Xpeak voltage best describes what? - ANSWERSvoltage or current average what best describes the term AC effective voltage ? - ANSWERSthe AC voltage required to produce the same power as a DC voltage what is the peak voltage of a waveform with 480 VAC RMS? - ANSWERS679 volts what effect an inductor has on current flow ? - ANSWERSit opposes change what is the secondary voltage of a 5 to 1 step down transformormer whith a primary voltage of 125 volts - ANSWERS25 volts the primary of a 5 to 1 step down transformer has 1 amp . what is the secondary current? - ANSWERS5 amps how can three phase voltage be stepped down using transformer ? - ANSWERSby using a three phase transformer or three single phase transformers