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Alternating Current Vs Direct Current Online Exam Quiz

Important questions about Alternating Current Vs Direct Current. Alternating Current Vs Direct Current MCQ questions with answers. Alternating Current Vs Direct Current exam questions and answers for students and interviews.

1. If a sine wave signal is 100 mV peak-to-peak, how many volts would be measured by a voltmeter?

Options

A : 14.14 mV

B : 35.4 mV

C : 63.7 mV

D : 70.7 mV

2. One oscilloscope selector knob that allows the major and minor divisions of the graticule to be used to determine a signal amplitude value is called the:

Options

A : time/cm control

B : position control

C : intensity control

D : volts/cm control

3. What is the name of a device used to directly measure the frequency of a periodic wave?

Options

A : oscilloscope

B : frequency meter or counter

C : audio frequency generator

D : radio frequency generator

4. A test equipment item that has the ability to produce either square, triangular, or sawtooth waveforms is called:

Options

A : a function generator

B : a radio frequency generator

C : an audio frequency generator

D : a frequency meter or counter

5. The distance that a signal's energy can travel in the time it takes for one cycle to occur is called the signal's:

Options

A : amplitude

B : frequency

C : wavelength

D : period

6. Why is ac current transfer more effective than dc current transfer over long distances?

Options

A : due to the height of power lines

B : due to the use of ac generators

C : due to step-up and step-down transformers reducing I 2 R losses

D : due to very high voltages

7. A rectangular wave that has a duty cycle of 50 percent could be called a:

Options

A : c wave

B : sawtooth wave

C : square wave

D : triangle wave

8. If a waveform period is determined to be 10 microseconds in duration, what is the frequency of the signal?

Options

A : 100 Hz

B : 1000 Hz

C : 10 kHz

D : 100 kHz

9. Which control should be moved to display more cycles of a signal on an oscilloscope?

Options

A : horizontal position to left or right

B : volts/cm to a smaller number

C : vertical position to top or bottom

D : time/cm to a higher setting

10. What is the peak-to-peak current value when an ammeter measures a 20 mA value?

Options

A : 14 mA

B : 28 mA

C : 40 mA

D : 57 mA

1. If a voltmeter measures a sine wave as 500 mV, what would be its average value?

Options

A : 159.0 mV

B : 318.5 mV

C : 353.5 mV

D : 451.0 mV

2. AC effective voltage is named:

Options

A : average

B : peak

C : peak-to-peak

D : root mean square

3. What is the name of a device that converts sound waves to electrical waves?

Options

A : an amplifier

B : an antenna

C : a filter

D : a microphone

4. What is the average value of a 12 V peak wave?

Options

A : 3.82 V

B : 4.24 V

C : 7.64 V

D : 9.42 V

5. If the frequency of a radio wave is increased, then its wavelength will:

Options

A : increase

B : decrease

C : remain the same

D : cannot tell

6. A triangle wave consists of repeating:

Options

A : positive ramps only

B : negative ramps only

C : positive and negative ramps of equal value

D : positive and negative ramps of unequal value

7. One oscilloscope selector knob that allows the major and minor divisions of the graticule to be used to determine a waveform period is called a:

Options

A : focus control

B : time/cm control

C : intensity control

D : volts/cm control

8. What term expresses the frequency of a rectangular wave?

Options

A : Hz

B : period

C : PRF

D : PRT

9. One adjustable knob on the oscilloscope that allows the trace to be aligned with a reference graticule is called the:

Options

A : position control

B : focus control

C : intensity control

D : volts/cm control

10. What is the peak value of a household appliance that uses a 230 V ac source?

Options

A : 163 V

B : 230 V

C : 325 V

D : 480 V

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