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Q. No.In the circuit shown below, the inductance \(L\) is connected to a source. The current flowing in the circuit is \({I=I_{0}\sin\omega t.}\) The voltage drop \((V_L)\) across \(L\) is:
1.
\(\omega L~I_0\sin\omega t\)
2.
\(\frac{{I}_0}{\omega{L}}\sin\omega t\)
3.
\(\frac{{I}_0}{\omega{L}}\cos\omega t\)
4.
\(\omega L~I_0\cos\omega t\)
Subtopic: Â Different Types of AC Circuits |
 50%
Level 3: 35%-60%
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A step-up transformer is connected to an AC mains supply of \(220~\text V\) to operate at \(11000~\text V, 88~\text W.\) The current in the secondary circuit, ignoring the power loss in the transformer, is:
1. \(8~\text{mA}\)
2. \(4~\text{mA}\)
3. \(0.4~\text{A}\)
4. \(4~\text{A}\)
1. \(8~\text{mA}\)
2. \(4~\text{mA}\)
3. \(0.4~\text{A}\)
4. \(4~\text{A}\)
Subtopic: Â Transformer |
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Level 2: 60%+
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\(L,C\) and \(R\) represent the value of inductance, capacitance, and resistance, respectively. The factor which has the same dimensions as that of the inverse of the resonance frequency is:
| 1. | \(\sqrt{LC}\) | 2. | \(\sqrt{\dfrac{L}{C}}\) |
| 3. | \(\dfrac{C}{L}\) | 4. | \(\dfrac{R}{L}\) |
Subtopic: Â Different Types of AC Circuits |
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Level 2: 60%+
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A \(10~\mu\text F\) capacitor is connected to a \(210~\text V,50~\text{Hz}\) source as shown in the figure. The peak current in the circuit is nearly \((\pi = 3.14)\):
1. \(0.93~\text A\)
2. \(1.20~\text A\)
3. \(0.35~\text A\)
4. \(0.58~\text A\)
1. \(0.93~\text A\)
2. \(1.20~\text A\)
3. \(0.35~\text A\)
4. \(0.58~\text A\)
Subtopic: Â RMS & Average Values |
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In an ideal transformer, the turns ratio is \(\frac{N_p}{N_s}=\frac{1}{2} .\) The ratio \(V_s:V_p\) is equal to (the symbols carry their usual meaning):
1. \(2:1\)
2. \(1:1\)
3. \(1:4\)
4. \(1:2\)
1. \(2:1\)
2. \(1:1\)
3. \(1:4\)
4. \(1:2\)
Subtopic: Â Transformer |
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To an AC power supply of \(220~\text V\) at \(50~\text{Hz},\) a resistor of \(20~\Omega,\) a capacitor of reactance \(25~\Omega\) and an inductor of reactance \(45~\Omega\) are connected in series. The corresponding current in the circuit and the phase angle between the current and the voltage is, respectively:
1. \(15.6~\text {A and} ~30^\circ\)
2. \(15.6~\text {A and} ~45^\circ\)
3. \(7.8~\text {A and} ~30^\circ\)
4. \(7.8~\text {A and} ~45^\circ\)
1. \(15.6~\text {A and} ~30^\circ\)
2. \(15.6~\text {A and} ~45^\circ\)
3. \(7.8~\text {A and} ~30^\circ\)
4. \(7.8~\text {A and} ~45^\circ\)
Subtopic: Â Different Types of AC Circuits |
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Please attempt this question first.
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Please attempt this question first.
For very high frequencies, the effective impedance of the circuit (shown in the figure) will be:
| 1. | \(4~ \Omega\) | 2. | \(6~ \Omega\) |
| 3. | \(1~ \Omega\) | 4. | \(3~ \Omega\) |
Subtopic: Â Different Types of AC Circuits |
 55%
Level 3: 35%-60%
NEET - 2023
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The maximum power is dissipated for an AC in a/an:
| 1. | resistive circuit | 2. | \({LC}\) circuit |
| 3. | inductive circuit | 4. | capacitive circuit |
Subtopic: Â Power factor |
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If \(Z_1\) and \(Z_2\) are the impedances of the given circuits \(\mathrm{(a)}\) and \(\mathrm{(b)}\) as shown in the figures, then choose the correct option:
1. \(Z_1<Z_2\)
2. \(Z_1+Z_2=20~\Omega\)
3. \(Z_1=Z_2\)
4. \(Z_1>Z_2\)
1. \(Z_1<Z_2\)
2. \(Z_1+Z_2=20~\Omega\)
3. \(Z_1=Z_2\)
4. \(Z_1>Z_2\)
Subtopic: Â Different Types of AC Circuits |
 66%
Level 2: 60%+
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An AC source is connected to the given circuit. The value of \(\phi\) will be:
| 1. | \(60^\circ\) | 2. | \(90^\circ\) |
| 3. | \(30^\circ\) | 4. | \(45^\circ\) |
Subtopic: Â Different Types of AC Circuits |
 68%
Level 2: 60%+
NEET - 2023
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