Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Alternating Current question

2016 · Q126
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Alternating Current
  5. /2016 · Q126

Alternating Current question

2016 · Q126

NEETPhysicsAlternating CurrentMCQ+4 / −1
Which of the following combinations should be selected for better tuning of an L-C-R circuit used for combination ?
  1. A
    R = 20 Ω\OmegaΩ, L = 1.5 H, C = 35 μ\muμF
  2. B
    R = 25 Ω\OmegaΩ, L = 2.5 H, C = 45 μ\muμF
  3. C
    R = 15 Ω\OmegaΩ, L = 3.5 H, C = 30 μ\muμF
  4. D
    R = 25 Ω\OmegaΩ, L = 1.5 H, C = 45 μ\muμF
View written solutionFree

Correct answer: C

Quality factor of an L-C-R circuit is given by,

Q = 1RLC{1 \over R}\sqrt {{L \over C}} R1​CL​​

So, Q1 = 1201.535×10−6{1 \over {20}}\sqrt {{{1.5} \over {35 \times {{10}^{ - 6}}}}} 201​35×10−61.5​​ = 10.35

Q2 = 1252.545×10−6{1 \over {25}}\sqrt {{{2.5} \over {45 \times {{10}^{ - 6}}}}} 251​45×10−62.5​​ = 9.43

Q3 = 1153.530×10−6{1 \over {15}}\sqrt {{{3.5} \over {30 \times {{10}^{ - 6}}}}} 151​30×10−63.5​​ = 22.77

Q4 = 1251.545×10−6{1 \over {25}}\sqrt {{{1.5} \over {45 \times {{10}^{ - 6}}}}} 251​45×10−61.5​​ = 7.30

As Q3 is maximum of Q1, Q2, Q3, and Q4. Hence, option (c) should be selected for better tuning of an L-C-R circuit.

PreviousNext

More from Alternating Current

  • The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is2016 · MCQ
  • A 100 Ω resistance and a capacitor of 100 Ω reactance are connected in series across a 220 V source. When the capacitor is 50% charged, the peak value of the displacement current is2016 · MCQ
  • A series R-C circuit is connected to an alternating voltage source. Consider two situations : (a) When capacitor is air filled. (b) When capacitor is mica filled. Current through resistor is I and voltage across capacitor is V then2015 · MCQ
  • A resistance 'R' draws power 'P' when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes 'Z'. the power drawn will be2015 · MCQ
  • A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are2014 · MCQ
  • The primary of a transformer when connected to a dc battery of 10 Volt draws a current of 1 mA. The number of turns of the primary and secondary windings are 50 and 100 respectively. The voltage in the secondary and the current drawn by…2013 · MCQ
  • A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when2013 · MCQ
  • The instantaneous values of alternating current and voltage in a circuit are given as i=2​1​ sin (100 πt) ampere e=2​1​sin(100πt+3π​) Volt The average power…2012 · MCQ