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Alternating Current · Question 49

AIPMT 2006MCQEasy📈 Topic in 38% papers+4−1
1

The core of a transformer is laminated because

  1. ratio of voltage in primary and secondary may be increased
  2. energy losses due to eddy currents may be minimised
  3. the weight of the transformer may be reduced
  4. rusting of the core may be prevented.

Answer

(2) energy losses due to eddy currents may be minimised

Solution

As per NCERT, the alternating magnetic flux induces eddy currents in the iron core, which heat it and waste energy.

∵ A laminated core (thin insulated sheets) breaks the paths of these currents, the eddy currents and the energy loss are minimised.

Answer: (2)

AIPMT 2006

Keep practising — Alternating Current

2

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
AIPMT 2006
3

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)
AIPMT 2005
4

For a series LCR circuit the power loss at resonance is

  1. V2 [ L - 1 C ]
  2. I2L
  3. I2R
  4. V2C
AIPMT 2002
5

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
6

The value of quality factor is

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

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