CH 16

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Across
  1. 2. is used for cycles per second
  2. 3. the wave in represents a voltage that slowly increases, with a uniform or linear rate of change, to its peak value, and then drops sharply to its starting value sinewave ( 12 words)
  3. 10. he voltage output across any two output terminals the three windings are connected in the form of a delta
  4. 11. suppose that the generator started its cycle at point b where maximum voltage output instead of starting at the point of zero output (10 word)
  5. 13. this is an arithmetic average of all the values in a sine wave for one alternation, or half-cycle. The half-cycle is used for the average because over a full cycle the average value is zero (12 words)
  6. 16. in an ac machine two or more collector rings enable the rotating loop to be connected to the stationary wire leads for the external circuit (9 words)
  7. 17. the number of cycles per second is harmonic consider a repetitive nonsinusoidal waveform such as a 100-Hz square wave its fundamental rate of repetition is 100 Hz exact multiples of the fundamental frequency are called (9 word)
  8. 21. represents a switching voltage first the 10V peak is instantaneously applied in positive polarity 10 words)
  9. 22. one complete revolution of the loop around the circle is a
Down
  1. 1. when a periodic variation is considered with respect to distance, one cycle includes the (10 words)
  2. 4. current generators are alternators for large power requirements the alternator usually has a rotating field and the armature is the stator(10 words)
  3. 5. the most common method of specifying the amount of a sine wave of voltage or claret is by relating it to the dc voltage and current that will produce the same heating effect (8 words)
  4. 6. also called star connections all three coils are joined at one end with the opposite ends for the output terminals (14 words)
  5. 7. an alternating voltage with an rmsvalue of 120 V for instance, is just as effective in heating the filament of a lightbulb as 120 V(14 words)
  6. 8. this electromagnet provides the flux cut by the rotor in a motor, current for the field is produced by the same source that supplies the(12 word)
  7. 9. these graphite connectors are spring mounted to brush against the spinning rings on the rotor (12 words)
  8. 12. the sine and cosine waveforms really have the same variations, but displaced by 90 in fact, both waveforms are called (8 words)
  9. 14. is a quantity that has magnitude and direction (6 words)
  10. 15. in an alternator with three generator windings equally spaced around the circle the windings will produce output voltages 1200 out of phase with each other (15 words)
  11. 18. a dc machine has a commutator ring instead of the slip rings
  12. 19. therefore, the induced voltage values shown in the graph decrease from the maximum value to zero at the half-turn, just as the voltage was zero at the start. The half-cycle of revolution is called (11 words)
  13. 20. A common unit for frequency multiples peakvalue this is the maximum value Vm(9 words)