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? #card
	- 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? #card
	- 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? #card
	- 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? #card
	- 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? #card
	- 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? #card
	- 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? #card
	- 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? #card
	- 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? #card
	- 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? #card
	- 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? #card
	- 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? #card
	- 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? #card
	- 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? #card
	- A. 8.75 watts
	- B. 625 watts
	- C. 2500 watts
	- D. 5000 watts