## Alternating Current and Voltage Online Free Mock Test-1

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## Mock Test-4

### Number of Questions – 40

Notes : The Quiz makes In multiple-choice quiz, there is a timer for 50 seconds/question.When 10 seconds is left, automatically the timer is red in color.finally, when the time is end,the correct answer is automatically shown.

The usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with positive direction of the current and vice versa. The direction of the current may not actually reverse (as for the labeled pulsating waveform). In certain applications, like guitar amplifiers, different waveforms are used, such as triangular waves or square waves. Audio and radio signals carried on electrical wires are also examples of alternating current.

These types of alternating current carry information such as sound (audio) or images (video) sometimes carried by modulation of an AC carrier signal. These currents typically alternate at higher frequencies than those used in power transmission. more content visit wikipedia

### Example Questions:

1. 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
2. A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of
3. 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?
4. A ramp is the type of waveform characterized by a non-linear increase or decrease in voltage or current.
5. If the rms current through a 6.8 kΩ resistor is 8 mA, the rms voltage drop across the resistor is
6. A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is
7. The unit of frequency is the hertz.
8. If the rms current through a 4.7 kΩ resistor is 4 mA, the peak voltage drop across the resistor is