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# Electrical Waveforms Quiz

Created by
@FaultlessMarsh8570

### What determines the direction of current movement in an AC circuit?

Terminal voltage polarities

### What is the amplitude in the context of AC alternations?

The distance from zero to the maximum value of each alternation

### How does AC differ from DC in terms of current flow?

Flows first in one direction and then in the opposite direction

### What is the most common waveform for AC power?

<p>Sine (or sinusoidal) waveform</p> Signup and view all the answers

### What produces a greater force to drive electrons in a conductor?

<p>Cutting lines of flux quickly</p> Signup and view all the answers

### How does the number of poles in a generator affect the cycles completed in a revolution?

<p>Increases the number of cycles completed</p> Signup and view all the answers

### When does the peak value of a sine wave occur?

<p>Twice each cycle</p> Signup and view all the answers

### What does instantaneous value of voltage or current represent?

<p>Value at any time on the sine wave</p> Signup and view all the answers

### What is the magnitude called that represents the voltage or current between the peak positive and peak negative values?

<p>Peak-to-peak value</p> Signup and view all the answers

### What is the key factor that determines the induced voltage in a generator?

<p>The strength of the magnetic field</p> Signup and view all the answers

### What is the primary reason for the sinusoidal waveform produced by a generator?

<p>The changing angle between the armature conductors and the magnetic field</p> Signup and view all the answers

### What is the significance of the armature conductors being parallel to the magnetic field at the 0° position?

<p>It results in no induced voltage</p> Signup and view all the answers

### How does the induced voltage change as the armature rotates from 90° to 180°?

<p>It decreases from a maximum positive value to zero</p> Signup and view all the answers

### What is the significance of the armature conductors cutting through the magnetic field in the opposite direction from 180° to 270°?

<p>It results in a negative induced voltage that builds up to a maximum at 270°</p> Signup and view all the answers

### Which of the following is the primary factor that determines the shape of an AC waveform?

<p>The method used to generate the AC power</p> Signup and view all the answers

### What is the relationship between the angle of rotation of an alternator and the amplitude of the resulting sinusoidal AC waveform?

<p>The amplitude is directly proportional to the angle of rotation</p> Signup and view all the answers

### What is the primary advantage of using a sinusoidal AC waveform compared to a non-sinusoidal waveform in power distribution systems?

<p>Sinusoidal waveforms are easier to transform using a transformer</p> Signup and view all the answers

### Which of the following electronic circuits is MOST likely to produce a non-sinusoidal AC waveform?

<p>A full-wave rectifier</p> Signup and view all the answers

### What is the primary advantage of using a three-phase AC generator (alternator) compared to a single-phase generator?

<p>Three-phase generators can produce higher power output</p> Signup and view all the answers

### In a three-phase AC generator, what is the phase difference between the voltage waveforms of the three phases?

<p>120 degrees</p> Signup and view all the answers

### If Phase A voltage in a three-phase system reaches its positive peak at 0 degrees, at what angle does Phase B voltage reach its positive peak?

<p>120 degrees</p> Signup and view all the answers

### Which of the following waveforms is not mentioned as an example of an AC signal type in the given text?

<p>Gaussian wave</p> Signup and view all the answers

### What is the distinguishing feature of alternating waveforms mentioned in the text?

<p>They have equal areas enclosed above and below the time axis</p> Signup and view all the answers

### If Phase A voltage in a three-phase system is represented by $V_A = V_m \sin(\omega t)$, what would be the expression for Phase B voltage?

<p>$V_B = V_m \sin(\omega t + \frac{2\pi}{3})$</p> Signup and view all the answers

### In a balanced three-phase AC system, the phase angle between any two adjacent phases is:

<p>120 degrees</p> Signup and view all the answers

### The frequency of the output voltage in a three-phase generator is primarily determined by:

<p>Both the number of poles and the speed of rotation</p> Signup and view all the answers

### In a series LCR circuit, if the inductive reactance is equal to the capacitive reactance, the phase angle between the applied voltage and the current will be:

<p>0 degrees (in phase)</p> Signup and view all the answers

### In a series LCR circuit, the phase angle of the circuit current $I_T$ with respect to the applied voltage is determined by:

<p>The ratio of the difference between $V_C$ and $V_L$ to $V_R$</p> Signup and view all the answers

### In a three-phase generator, if the number of poles is increased while the rotational speed remains constant, the output frequency will:

<p>Increase</p> Signup and view all the answers

### Which waveform can be generated using a simple DC circuit that measures the voltage at a capacitor that is gradually charged and rapidly discharged?

<p>Triangular wave</p> Signup and view all the answers

### What is the key difference between a sawtooth wave and a triangular wave?

<p>The timing associated with the rise and fall of the wave shape</p> Signup and view all the answers

### What is the identifying feature of a sawtooth wave?

<p>Unequal rise and fall times</p> Signup and view all the answers

### What is the simplest square wave generator mentioned in the text?

<p>Switch: on and off</p> Signup and view all the answers

### At what speed can current CPU clocks operate, according to the text?

<p>&gt;4.0 GHz</p> Signup and view all the answers

### What type of generator is used by current computer processors for clock pulses?

<p>Square wave generator</p> Signup and view all the answers

### What feature distinguishes a square wave generator from other waveforms?

<p>Different rise and fall times</p> Signup and view all the answers

### What unique characteristic defines a triangular waveform in comparison to a sawtooth waveform?

<p>Equal rise and fall time periods</p> Signup and view all the answers

### What determines the speed capability of a simple square wave generator?

<p>&gt;4.0 GHz frequency operations</p> Signup and view all the answers

### How does the timing of a triangular wave differ from that of a sawtooth wave?

<p>Equal rise and fall times in a triangular wave compared to unequal in a sawtooth wave.</p> Signup and view all the answers

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