100 lines
3.4 KiB
Markdown
100 lines
3.4 KiB
Markdown
G5C – Resistors, capacitors, and inductors in series and parallel; transformers
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- [[G5C01]] (C)
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What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding?
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- A. Capacitive coupling
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- B. Displacement current coupling
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- C. Mutual inductance
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- D. Mutual capacitance
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- [[G5C02]] (A)
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What is the output voltage if an input signal is applied to the secondary winding of a 4:1 voltage step-down transformer instead of the primary winding?
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- A. The input voltage is multiplied by 4
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- B. The input voltage is divided by 4
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- C. Additional resistance must be added in series with the primary to prevent overload
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- D. Additional resistance must be added in parallel with the secondary to prevent overload
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- [[G5C03]] (A)
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What is the total resistance of a 10-, a 20-, and a 50-ohm resistor connected in parallel?
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- A. 5.9 ohms
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- B. 0.17 ohms
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- C. 17 ohms
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- D. 80 ohms
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- [[G5C04]] (D)
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What is the approximate total resistance of a 100- and a 200-ohm resistor in parallel?
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- A. 300 ohms
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- B. 150 ohms
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- C. 75 ohms
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- D. 67 ohms
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- [[G5C05]] (B)
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Why is the primary winding wire of a voltage step-up transformer usually a larger size than that of the secondary winding?
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- A. To improve the coupling between the primary and secondary
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- B. To accommodate the higher current of the primary
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- C. To prevent parasitic oscillations due to resistive losses in the primary
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- D. To ensure that the volume of the primary winding is equal to the volume of the secondary winding
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- [[G5C06]] (A)
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What is the voltage output of a transformer with a 500-turn primary and a 1500-turn secondary when 120 VAC is applied to the primary?
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- A. 360 volts
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- B. 120 volts
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- C. 40 volts
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- D. 25.5 volts
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- [[G5C07]] (A)
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What transformer turns ratio matches an antenna’s 600-ohm feed point impedance to a 50-ohm coaxial cable?
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- A. 3.5 to 1
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- B. 12 to 1
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- C. 24 to 1
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- D. 144 to 1
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- [[G5C08]] (D)
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What is the equivalent capacitance of two 5.0-nanofarad capacitors and one 750-picofarad capacitor connected in parallel?
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- A. 576.9 nanofarads
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- B. 1,733 picofarads
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- C. 3,583 picofarads
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- D. 10.750 nanofarads
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- [[G5C09]] (C)
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What is the capacitance of three 100-microfarad capacitors connected in series?
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- A. 0.33 microfarads
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- B. 3.0 microfarads
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- C. 33.3 microfarads
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- D. 300 microfarads
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- [[G5C10]] (C)
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What is the inductance of three 10-millihenry inductors connected in parallel?
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- A. 0.30 henries
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- B. 3.3 henries
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- C. 3.3 millihenries
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- D. 30 millihenries
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- [[G5C11]] (C)
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What is the inductance of a circuit with a 20-millihenry inductor connected in series with a 50-millihenry inductor?
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- A. 7 millihenries
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- B. 14.3 millihenries
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- C. 70 millihenries
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- D. 1,000 millihenries
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- [[G5C12]] (B)
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What is the capacitance of a 20-microfarad capacitor connected in series with a 50-microfarad capacitor?
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- A. 0.07 microfarads
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- B. 14.3 microfarads
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- C. 70 microfarads
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- D. 1,000 microfarads
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- [[G5C13]] (C)
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Which of the following components should be added to a capacitor to increase the capacitance?
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- A. An inductor in series
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- B. An inductor in parallel
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- C. A capacitor in parallel
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- D. A capacitor in series
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- [[G5C14]] (D)
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Which of the following components should be added to an inductor to increase the inductance?
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- A. A capacitor in series
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- B. A capacitor in parallel
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- C. An inductor in parallel
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- D. An inductor in series
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