What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding?

1. A Capacitive coupling
2. B Displacement current coupling
3. C Mutual inductance
4. D Mutual capacitance

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?

1. A The input voltage is multiplied by 4
2. B The input voltage is divided by 4
3. C Additional resistance must be added in series with the primary to prevent overload
4. D Additional resistance must be added in parallel with the secondary to prevent overload

What is the total resistance of a 10-, a 20-, and a 50-ohm resistor connected in parallel?

1. A 5.9 ohms
2. B 0.17 ohms
3. C 17 ohms
4. D 80 ohms

What is the approximate total resistance of a 100- and a 200-ohm resistor in parallel?

1. A 300 ohms
2. B 150 ohms
3. C 75 ohms
4. D 67 ohms

Why is the primary winding wire of a voltage step-up transformer usually a larger size than that of the secondary winding?

1. A To improve the coupling between the primary and secondary
2. B To accommodate the higher current of the primary
3. C To prevent parasitic oscillations due to resistive losses in the primary
4. D To ensure that the volume of the primary winding is equal to the volume of the secondary winding

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?

1. A 360 volts
2. B 120 volts
3. C 40 volts
4. D 25.5 volts

What transformer turns ratio matches an antenna's 600-ohm feed point impedance to a 50-ohm coaxial cable?

1. A 3.5 to 1
2. B 12 to 1
3. C 24 to 1
4. D 144 to 1

What is the equivalent capacitance of two 5.0-nanofarad capacitors and one 750-picofarad capacitor connected in parallel?

1. A 576.9 nanofarads
2. B 1,733 picofarads
3. C 3,583 picofarads
4. D 10.750 nanofarads

What is the capacitance of three 100-microfarad capacitors connected in series?

1. A 0.33 microfarads
2. B 3.0 microfarads
3. C 33.3 microfarads
4. D 300 microfarads

What is the inductance of three 10-millihenry inductors connected in parallel?

1. A 0.30 henries
2. B 3.3 henries
3. C 3.3 millihenries
4. D 30 millihenries

What is the inductance of a circuit with a 20-millihenry inductor connected in series with a 50-millihenry inductor?

1. A 7 millihenries
2. B 14.3 millihenries
3. C 70 millihenries
4. D 1,000 millihenries

What is the capacitance of a 20-microfarad capacitor connected in series with a 50-microfarad capacitor?

1. A 0.07 microfarads
2. B 14.3 microfarads
3. C 70 microfarads
4. D 1,000 microfarads

Which of the following components should be added to a capacitor to increase the capacitance?

1. A An inductor in series
2. B An inductor in parallel
3. C A capacitor in parallel
4. D A capacitor in series

Which of the following components should be added to an inductor to increase the inductance?

1. A A capacitor in series
2. B A capacitor in parallel
3. C An inductor in parallel
4. D An inductor in series