test 1
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| AC voltages change at regular intervals? | true
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| Sine waves are the most common waveforms | True
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| AC waveform change in direction | true
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| E | True
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| dc can be changed into ac but ac can not be turned into dc | False
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| The amount of current made during induction is based on what 4 factors? | 1 Speed of rotation
2 Strength of magnetic field
3 Length of conductor
4 Angle of conductor
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| Most steam driven turbines use what kind of rotor? | A. Cylindrical
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| How is output produced by an alternator controlled? | A rheostat changes the excitation voltage
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| One complete wave in a waveform is called? | A cycle
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| The time to complete one cycle is called? | A period
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| What is the cycles per second called? | Frequency
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| What is the frequency of a wave if the period time is 2ms? | 500hrtz
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| in a 60hertz waveform what is the period time? | 16.7ms
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| a system has a Peak value of 200v what is the RMS voltage and how do you calculate? | peak*.707
200*.707=141.4v rms
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| a system has a RMS value of 90v what is the Peak voltage and how do you calculate? | rms*1.414
90*1.414= 127.26 peak
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| What is the peak to peak value of a system with 100v peak | 200v peak to peak
peak value*2
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| A Waveform has a peak value of 80A What is the average value? | 80*.637=50.96A average
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| three phase waveform are how many degrees apart? | 360/3=120
120 degrees
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| An alterernator has 3 stator coils in a wye configuration A line current is 10A what is phase current? B Line Voltage is 240 volts what is Phase Voltage? | A in wye amps are the same in phase as in the line 10A
B Line= phase*1.73
240/1.73= 138.7V phase
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| In A Purely Resistive AC Circuit the Current and the Voltage are in? | In Phase
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| A 480v 3 phase delta configuration system has 10 ohms of resistance What is the current in phase? What is the total power used? | 480/10 = 48A
48*480*3= 69120Watts
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| Name the 4 effects that increase the resistance in an AC circuit | Histersis
Skin effect
Eddy currents
Diaelectric stress
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| An alternator is said to be in sync when? | All of the above
alternator frequency = system frequency
alternator X = system X
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| For revolving field synchronous alternators the term stator winding and ___________ and interchangeable | Field Winding
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