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Alternating Current

AIPMT 2006MCQEasy📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2006

A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produces oscillations of frequency f. If L is doubled and C is changed to 4C, the frequency will be

  1. f/2
  2. f/4
  3. 8f
  4. f/2 2

Answer

(4) f/2 2

Solution

f = 12 LC

New product L'C' = (2L)(4C) = 8LC

f' = f 8 = f2 2

Answer: (4)

Keep practising — Alternating Current

Ques. 2AIPMT 2005

In a circuit L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45 . The value of C is

  1. 1 f(2 fL - R)
  2. 12 f(2 fL - R)
  3. 1 f(2 fL + R)
  4. 12 f(2 fL + R)
Ques. 3AIPMT 2002

For a series LCR circuit the power loss at resonance is

  1. V2 [ L - 1 C ]
  2. I2L
  3. I2R
  4. V2C
Ques. 4AIPMT 2001

A capacitor of capacity C has reactance X. If capacitance and frequency become double then reactance will be

  1. 4X
  2. X/2
  3. X/4
  4. 2X
Ques. 5AIPMT 2001

The value of quality factor is

  1. LR
  2. 1 RC
  3. LC
  4. L/R

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