Impedance in RLC Circuit
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R=15Q R=10Q
An AC circuit has , and , connected in series. The quality factor of the circuit is
A series LCR circuit is designed to resonate at an angular frequency . The circuit draws power from source at resonance. The value of resistance in the circuit is _______ .
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- V3
- V1
- V2
- V4
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(b) Calculate the value of additional capacitor which may be joined suitably to the capacitor C that would make the power factor of the circuit unity.
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- 15 Ω
- 25 Ω
- 50 Ω
- 150 Ω
- 1 μF
- 6 μF
- 4 μF
- 5 μF
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- 12 Ω
- 40 Ω
- √(52×28) Ω
- 360 Ω
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Assertion : A choke coil is preferred over a resistor to adjust current in an AC circuit.
Reason : Power factor for inductance is zero, so, power loss is also zero for a full cycle.
Based on the above statements, choose the correct alternative.
- Both assertion and reason are true, and the reason is a correct explanation of the assertion.
- Both assertion and reason are true, but the reason is not a correct explanation of the assertion.
- Assertion is true, but the reason is false.
- Assertion is false, but the reason is true.
Given current of 4 A flows through an inductor of 2 H. What is the energy stored in inductor?
4
32
16
8
What is the voltage drop across a electric heater element whose resistance, when hot, is ?
- 2 A
- 4 A
- 2√2 A
- √0.4 A
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- The voltage across 100 Ω resistor = 20
- The voltage across 50Ω resistor = 20
- The current through the circuit is I=√5√2A
- The current through the circuit is I = 1.2 A
- 2μF
- 1μF
- 5μF
- 10μF
- 400 Ω
- 1300 Ω
- 900 Ω
- 500 Ω
When is a transistor said to be in active state? Draw a circuit diagram of a p-n-p transistor and explain how it works as a transistor amplifier. Write clearly, why in the case of a transistor (i) the base is thin and lightly doped and (ii) the emitter is heavily doped.
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- Voltage across resistance is −3√3 V
- Voltage across resistance is 3√3 V
- Peak source voltage is 5√3
- Current in circuit is ahead of source voltage
- 125 W
- 555.5 W
- 1187.5 W
- 1525.2 W
(ii) A lamp is connected in series with an inductor and an AC source. What happens to the brightness of the lamp when the key is plugged in and an iron rod is inserted inside the inductor ? Explain.
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- 0.08 H
- 0.044 H
- 0.065 H
- 80 H
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- Current passing through the cell is maximum which has smallest value of internal resistance.
- Current passing through the cell is maximum which has largest value of internal resistance.
- Internal resistance of equivalent cell is larger than the internal resistance of any cell connected.
- Equivalent emf is 80E31
An RLC circuit with R=100ω is connected across ac source of 200V and angular frequency 300 rad/s. When only capacitance is removed, the current lags behind voltage by 60∘. When only inductance is removed, the current leads the voltage by 60∘. The current in the circuit is: (in Ampere)
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- 2 volts
- 10 volts
- zero
- 4.8 volts
The correct order for R1, R2 and R3
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- R3>R1>R2
- R3>R2>R1
- R1>R2>R3
- R2>R1>R3