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Multiple Choice

Choose the best response to complete the sentence or answer the question.

1 .       A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of [Hint]

 
 
 
 


2 .       A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of [Hint]

 
 
 
 


3 .       When a sine wave has a frequency of 100 Hz in 12 s it goes through [Hint]

 
 
 
 


4 .       If the peak of a sine wave is 13 V, the peak-to-peak value is [Hint]

 
 
 
 


5 .       If the peak value of a sine wave is 30 V, the rms value is [Hint]

 
 
 
 


6 .       The average value of a 12 V peak sine wave over one complete cycle is [Hint]

 
 
 
 


7 .       The average half-cycle value of a sine wave with a 40 V peak is [Hint]

 
 
 
 


8 .       One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is [Hint]

 
 
 
 


9 .       If the rms current through a 6.8 komega.gif resistor is 8 mA, the rms voltage drop across the resistor is [Hint]

 
 
 
 


10 .       If the rms current through a 4.7 komega.gif resistor is 4 mA, the peak voltage drop across the resistor is [Hint]

 
 
 
 


11 .       If the rms voltage drop across a 15 komega.gif resistor is 16 V, the peak current through the resistor is [Hint]

 
 
 
 


12 .       Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is [Hint]

 
 
 
 


13 .       A 20 kHz pulse waveform consists of pulses that are 15 mu.gifs wide. The duty cycle is [Hint]

 
 
 
 


14 .       A pulse wave form has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is [Hint]

 
 
 
 


15 .       A signal with a 400 mu.gifs period has a frequency of [Hint]

 
 
 
 


16 .       If a sine wave goes through 10 cycles in 20 mu.gifs, the period is [Hint]

 
 
 
 


17 .       The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is [Hint]

 
 
 
 


18 .       To produce an 800 Hz sine wave, a four-pole generator must be operated at [Hint]

 
 
 
 


19 .       A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is [Hint]

 
 
 
 


20 .       How many degrees are there in pi.gif/3 rad? [Hint]

 
 
 
 


21 .       Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true? [Hint]

 
 
 
 


22 .       A sine wave with an rms value of 12 V is riding on a dc level of 18 V. The maximum value of the resulting waveform is [Hint]

 
 
 
 


23 .       A waveform has a baseline of 3 V, a duty cycle of 20 %, and an amplitude of 8 V. The average voltage value is [Hint]

 
 
 
 


24 .       A sawtooth wave has a period of 10 ms. Its frequency is [Hint]

 
 
 
 


25 .       A square wave has a period of 60 mu.gifs. The first odd harmonic is [Hint]

 
 
 
 






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