AIPMT 2006 | Alternating Current Question 50 | Physics

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AIPMT 2006

MCQ (Single Correct Answer)

-1

The core of a transformer is laminated because

ratio of voltage in primary and secondary may be increased

energy losses due to eddy currents may be minimised

the weight of the transformer may be reduced

rusting of the core may be prevented.

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

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