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Alternating Current · Question 51

AIPMT 2005MCQMedium📈 Topic in 38% papers+4−1
1

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)

Answer

(4) 12 f(2 fL + R)

Solution

Current leads the voltage XC > XL

45 = XC - XLR = 1 XC = XL + R

12 fC = 2 fL + R

C = 12 f(2 fL + R)

Answer: (4)

AIPMT 2005

Keep practising — Alternating Current

2

For a series LCR circuit the power loss at resonance is

  1. V2 [ L - 1 C ]
  2. I2L
  3. I2R
  4. V2C
AIPMT 2002
3

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
AIPMT 2001
4

The value of quality factor is

  1. LR
  2. 1 RC
  3. LC
  4. L/R
AIPMT 2001

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