22. G5B – The decibel; current and voltage dividers

Описание: 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
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
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
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
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
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
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
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
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
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
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
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
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
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
This video was made with Clipchamp