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- Question
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
- Correct Answer
- 451.0 mV
ExplanationSome 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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Options- A. True
- B. False Discuss
Correct Answer: False
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Options- A. True
- B. False Discuss
Correct Answer: True
- 3. The operands in an addition operation consist of the augend and the addend.
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Correct Answer: True
- 4. In a BJT, the collector current is approximately equal to the base current.
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- 5. A sine wave has:
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- B. two alternations
- C. one period
- D. all of the above Discuss
Correct Answer: all of the above
- 6. The greater the selectivity, the wider the bandwidth.
Options- A. True
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Correct Answer: False
- 7. The unit of magnetic flux density is the weber.
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- 8. PROMs are volatile.
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- 10. Generally, increasing the resistance in a circuit will decrease the current.
Options- A. True
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Correct Answer: True
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