AIPMT 2006 | Alternating Current Question 51 | Physics

AIPMT 2006

MCQ (Single Correct Answer)

-1

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

$$f/2$$

$$f/4$$

$$8f$$

$$f/2$$$$\sqrt 2 $$

AIPMT 2005

MCQ (Single Correct Answer)

-1

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

$${1 \over {\pi f\left( {2\pi f\,L - R} \right)}}$$

$${1 \over {2\pi f\left( {2\pi f\,L - R} \right)}}$$

$${1 \over {\pi f\left( {2\pi f\,L + R} \right)}}$$

$${1 \over {2\pi f\left( {2\pi f\,L + R} \right)}}$$

AIPMT 2004

MCQ (Single Correct Answer)

-1

A coil of 40 henry inductance is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is

5 seconds

1/5 seconds

40 seconds

20 seconds

AIPMT 2002

MCQ (Single Correct Answer)

-1

For a series LCR circuit the power loss at resonance is

$${{{V^2}} \over {\left[ {\omega L - {1 \over {\omega C}}} \right]}}$$

$${I^2}L\omega $$

$${I^2}R$$

$${{{V^2}} \over {C\omega }}$$

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