Alternating current vs direct current interview questions

21.
AC effective voltage is named:
A. average
B. peak
C. peak-to-peak
D. root mean square
Answer: Option D

Explanation:

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22.
If a voltmeter measures a sine wave as 500 mV, what would be its average value?
A. 159.0 mV
B. 318.5 mV
C. 353.5 mV
D. 451.0 mV
Answer: Option D

Explanation:

Some AC Voltage Conversion:
Peak to rms: multiply peak by 0.707.

Peak to average: multiply peak by 0.637.

Rms to peak: multiply rms by 1.414.

Rms to average: multiply rms by 0.9.

Average to rms: multiply avg by 1.111.

Average to peak: multiply avg by 1.567.
Mostly voltmeter shows rms value. So, Vav = 0.9*Vrms

= 0.9*500.

= 450mV ~ [D] 451 mV.

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23.
One adjustable knob on the oscilloscope that allows the trace to be aligned with a reference graticule is called the:
A. position control
B. focus control
C. intensity control
D. volts/cm control
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24.
Signal comparisons may be most easily seen when using which item of test equipment?
A. spectrum analyzer
B. multimeter
C. function generator
D. dual trace oscilloscope
Answer: Option D

Explanation:

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25.
The magnitude that an alternation varies from zero is called its:
A. altitude
B. amplitude
C. attitude
D. polarity
Answer: Option B

Explanation:

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