# Tuned Circuits MCQ’s

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This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Tuned Circuits”.

1. What happens to the current when it passes through a capacitor?
a) Phase of voltage leads the current
b) Phase of current leads the voltage
c) Phase of current and voltage cancel out each other
d) Phase of current and voltage gets added

2. What happens to the voltage when it passes through an inductor/coil?
a) Phase of voltage leads the current
b) Phase of current leads the voltage
c) Phase of current and voltage cancel out each other
d) Phase of current and voltage gets added

3. What is reactance?
a) Resistance offered to ac current by resistor only
b) Resistance offered to dc current by resistor
c) Resistance offered to ac current by coil and capacitance
d) Resistance offered to dc current by coil and capacitance

4. A capacitor used in an ac circuit continually charges and discharges.
a) True
b) False

5. Calculate the reactance of a 100-pF capacitor at an operating frequency of 2 MHz?
a) 200Ω
b) 700.16Ω
c) 796.2Ω
d) 2Ω

6. What happens to inductive resistance when operating frequency is increased?
a) Increases
b) Decreases
c) Remains constant
d) Goes to infinite

7. What happens to capacitative reactance when operating frequency is increased?
a) Increases
b) Decreases
c) Remains constant
d) goes to infinite

8. Which one of the following is false with respect to stray capacitance?
a) Reduces with decrease in size of lead wires
b) Reduces when chip capacitors are used
c) Increases when lead wires a are lengthy
d) Increases with less capacitance value

9. What is the inductive reactance of a 40-μH coil at 18 MHz?
a) 4000Ω
b) 4522Ω
c) 4522H
d) 0

10. What is the bandwidth of a resonant circuit with a frequency of 28 MHz and a Q of 80?
a) 350KHz
b) 30KHz
c) 42.7KHz
d) 57.05MHz

11. What is the Q factor for a 3-μH inductor with a total resistance of 45Ω at 90 MHz?
a) 37.68
b) 37.68Ω
c) 29.22Ω
d) 32.75Ω

12. What is the resonant frequency of a 2.7-pF capacitor and a 33-nH inductor?
a) 512MHz
b) 720GHz
c) 250MHz
d) 533MHz

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