2.7 KiB
2.7 KiB
G5B – The decibel; current and voltage dividers; electrical power calculations; sine wave root-mean-square (RMS) values; PEP calculations
- G5B01 (B)
What dB change represents a factor of two increase or decrease in power?
- A. Approximately 2 dB
- B. Approximately 3 dB
- C. Approximately 6 dB
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D. Approximately 9 dB
- G5B02 (C)
How does the total current relate to the individual currents in a circuit of parallel resistors?
- A. It equals the average of the branch currents
- B. It decreases as more parallel branches are added to the circuit
- C. It equals the sum of the currents through each branch
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D. It is the sum of the reciprocal of each individual voltage drop
- G5B03 (B)
How many watts of electrical power are consumed if 400 VDC is supplied to an 800-ohm load?
- A. 0.5 watts
- B. 200 watts
- C. 400 watts
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D. 3200 watts
- G5B04 (A)
How many watts of electrical power are consumed by a 12 VDC light bulb that draws 0.2 amperes?
- A. 2.4 watts
- B. 24 watts
- C. 6 watts
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D. 60 watts
- G5B05 (A)
How many watts are consumed when a current of 7.0 milliamperes flows through a 1,250-ohm resistance?
- A. Approximately 61 milliwatts
- B. Approximately 61 watts
- C. Approximately 11 milliwatts
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D. Approximately 11 watts
- G5B06 (B)
What is the PEP produced by 200 volts peak-to-peak across a 50-ohm dummy load?
- A. 1.4 watts
- B. 100 watts
- C. 353.5 watts
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D. 400 watts
- G5B07 (C)
What value of an AC signal produces the same power dissipation in a resistor as a DC voltage of the same value?
- A. The peak-to-peak value
- B. The peak value
- C. The RMS value
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D. The reciprocal of the RMS value
- G5B08 (D)
What is the peak-to-peak voltage of a sine wave with an RMS voltage of 120 volts?
- A. 84.8 volts
- B. 169.7 volts
- C. 240.0 volts
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D. 339.4 volts
- G5B09 (B)
What is the RMS voltage of a sine wave with a value of 17 volts peak?
- A. 8.5 volts
- B. 12 volts
- C. 24 volts
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D. 34 volts
- G5B10 (C)
What percentage of power loss is equivalent to a loss of 1 dB?
- A. 10.9 percent
- B. 12.2 percent
- C. 20.6 percent
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D. 25.9 percent
- G5B11 (B)
What is the ratio of PEP to average power for an unmodulated carrier?
- A. 0.707
- B. 1.00
- C. 1.414
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D. 2.00
- G5B12 (B)
What is the RMS voltage across a 50-ohm dummy load dissipating 1200 watts?
- A. 173 volts
- B. 245 volts
- C. 346 volts
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D. 692 volts
- G5B13 (B)
What is the output PEP of an unmodulated carrier if the average power is 1060 watts?
- A. 530 watts
- B. 1060 watts
- C. 1500 watts
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D. 2120 watts
- G5B14 (B)
What is the output PEP of 500 volts peak-to-peak across a 50-ohm load?
- A. 8.75 watts
- B. 625 watts
- C. 2500 watts
- D. 5000 watts