PARALLEL RESONANCE

Introduction | Questions | Quiz

INTRODUCTION

Resonance occurs in a parallel R-L-C circuit when inductive and capacitive reactances are equal. Resistance does not affect the resonant frequency.

Formula for calculating resonant frequency:

    f = 1 000 000 / 2pi * sqr root of (LC )

      f = frequency in kilohertz
      L = inductance in microhenrys
      C = capacitance in picofarads
      2pi = 6.28
Note: Use calculator to compute values. Look closely at the values of L and C. If the values are small, the resonant frequency is high and all answers in kHz can be eliminated.

A-001-4-1.... What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 1 microhenry and C is 10 picofarads?
  1. 15.9 kHz
  2. 50.3 MHz
  3. 50.3 kHz
  4. 15.9 MHz
A-001-4-2.... What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 2 microhenrys and C is 15 picofarads?
  1. 29.1 MHz
  2. 29.1 kHz
  3. 5.31 MHz
  4. 5.31 kHz
A-001-4-3.... What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 5 microhenrys and C is 9 picofarads?
  1. 23.7 kHz
  2. 3.54 MHz
  3. 3.54 kHz
  4. 23.7 MHz
A-001-4-4.... What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 2 microhenrys and C is 30 picofarads?
  1. 2.65 MHz
  2. 20.5 MHz
  3. 2.65 kHz
  4. 20.5 kHz
A-001-4-5.... What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 15 microhenrys and C is 5 picofarads?
  1. 2.12 kHz
  2. 2.12 MHz
  3. 18.4 MHz
  4. 18.4 kHz
A-001-4-6.... What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 3 microhenrys and C is 40 picofarads?
  1. 1.33 kHz
  2. 1.33 MHz
  3. 14.5 MHz
  4. 14.5 kHz
A-001-4-7.... What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 40 microhenrys and C is 6 picofarads?
  1. 6.63 MHz
  2. 10.3 MHz
  3. 6.63 kHz
  4. 10.3 kHz
A-001-4-8.... What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 10 microhenrys and C is 50 picofarads?
  1. 7.12 MHz
  2. 7.12 kHz
  3. 3.18 MHz
  4. 3.18 kHz
A-001-4-9.... What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 200 microhenrys and C is 10 picofarads?
  1. 3.56 kHz
  2. 7.96 MHz
  3. 7.96 kHz
  4. 3.56 MHz
A-001-4-10.... What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 90 microhenrys and C is 100 picofarads?
  1. 1.77 kHz
  2. 1.77 MHz
  3. 1.68 MHz
  4. 1.68 kHz
A-001-4-11.... What is the value of inductance (L) in a parallel R-L-C circuit, if the resonant frequency is 14.25 MHz and C is 44 picofarads?
  1. 253.8 millihenrys
  2. 3.9 millihenrys
  3. 0.353 microhenry
  4. 2.8 microhenrys
QUIZ
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