Select Chapter Topics: Turn ratio of a step-up transformer is 1 : 25. If current in load coil is 2 A, then the current in primary coil will be:
1. 25 A
2. 50 A
3. 0.25 A
4. 0.5 A  Subtopic:  Transformer |
87%
From NCERT
AIPMT - 1998
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The value of the quality factor is:
1. $\frac{\omega L}{R}$

2. $\frac{\omega }{RC}$

3. $\sqrt{LC}$

4. L/R  Subtopic:  Different Types of AC Circuits |
78%
From NCERT
AIPMT - 2000
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A capacitor of capacity C has reactance X. If capacitance and frequency are doubled, then the reactance will be:

1.  4X

2.  $\frac{X}{2}$

3.  $\frac{X}{4}$

4.  2X  Subtopic:  Different Types of AC Circuits |
80%
From NCERT
AIPMT - 2001
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For a series $$\mathrm{LCR}$$ circuit, the power loss at resonance is:
1. $$\frac{V^2}{\left[\omega L-\frac{1}{\omega C}\right]}$$

2. $$\mathrm{I}^2 \mathrm{~L} \omega$$

3. $$I^2 R$$

4. $$\frac{\mathrm{V}^2}{\mathrm{C} \omega}$$  Subtopic:  Power factor |
78%
From NCERT
AIPMT - 2002
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A coil of 40 H inductance is connected in series with a resistance of 8 $$\Omega$$ and the combination is joined to the terminals of a 2 V battery. The time constant of the circuit is:
1. 1/5 s
2. 40 s
3. 20 s
4. 5 s  Subtopic:  Different Types of AC Circuits |
68%
From NCERT
AIPMT - 2004
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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 $$45^\circ$$. The value of $$C$$ is:

1. $$\frac{1}{2 \pi f(2 \pi f L+R)}$$
2. $$\frac{1}{\pi f(2 \pi f L+R)}$$
3. $$\frac{1}{2 \pi f(2 \pi f L-R)}$$
4. $$\frac{1}{\pi f(2 \pi f L-R)}$$  Subtopic:  Different Types of AC Circuits |
57%
From NCERT
AIPMT - 2005
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