AIPMT 2006 | Alternating Current Question 49 | Physics

AIPMT 2006

MCQ (Single Correct Answer)

-1

A coil of inductive reactance 31 $$\Omega $$ has a resistance of 8 $$\Omega $$. It is placed in series with a condenser of capacitative reactance 25 $$\Omega $$. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is

0.33

0.56

0.64

0.80

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

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

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

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

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

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