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For a coil having inductance of 318mH is connected in series with a pure resistance of 75The circuit is supplied from 50Hz source and the voltage across 75 resistor is found to be 150 V

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**Questions**

**a)An ac circuit as shown in the figure has an inductor of inductance L and a resistor of resistance R connected in series. Using the phasor diagram, explain why the voltage in the circuit will lead the current in phase.b)The potential difference across the resistor is 160 V and that across the inductor is 120 V. Find the effective value of the applied voltage. If the effective current in the circuit be 1.0 A, calculate the total impedance of the circuit.c)What will be the potential difference in the circuit when direct current is passed through the circuit?**

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**A 230 V, 50 Hz ac supply is applied to a coil of 0.06 H inductance and 2.5 resistance connected in series with a 6.8 ÂµF capacitor. Calculate (i) Impedance (ii) Current (iii) Phase angle between current and voltage (iv) power factor**

1 Answer

**In a 132 kV system, the series inductance up to the point of circuit breaker location is 50 mH. The shunt capacitance at the circuit breaker terminal is 0.05 Î¼F. The critical value of resistance in ohms required to be connected across the circuit breaker contacts which will give no transient oscillation is_______.**

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**A 0-1 Ampere moving iron ammeter has an internal resistance of 50 mÎ© and inductance of 0.1 mH. A shunt coil is connected to extend its range to 0-10 Ampere for all operating frequencies. The time constant in milliseconds and resistance in mÎ© of the shunt coil respectively are**

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**When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor. -CBSE Physics**

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**Draw the phasor diagram for a given AC Voltage applied to a. Pure Resistor. b. Pure Inductor. c. Pure Capacitor.**

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**A choke coil has**

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**An electric lamp, whose resistance is 20 â„¦, and a conductor of 4 â„¦ resistance are connected to a 6 V battery. Calculate (a) the total resistance of the circuit, (b) the current through the circuit, and (c) the potential difference acr**

1 Answer

**The circuit below incorporates a permanent magnet moving coil milliâ€“ammeter of range 1 mA having a series resistance of 10kâ„¦. Assuming constant diode forward resistance of 50â„¦ a forward diode drop of 0.7 V and infinite reve**

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**An electric lamp of 100 â„¦, a toaster of resistance 50 â„¦, and a water filter of resistance 500 â„¦ are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as a**

1 Answer

**An electric lamp of resistance 20 R and a conductor of resistance 4 R are connected to a 6 V battery as shown in the circuit. Calculate**

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**An ac Supply voltage of 230V 50Hz is given to the circuit containing 30 ohm. Find the value of active power?**

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**If each of the values of inductance, capacitance and resistance of a series LCR circuit are doubled, the Q-factor of the circuit would**

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**Derive the condition for resonance in a series LCR circuit connected to an a.c. source of variable frequency (Physics CBSE 2018)**

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**A moving coil instrument having a resistance of 10 Î©, gives a full-scale deflection when the current is 10 mA. What should be the value of the series resistance, so that it can be used as a voltmeter for measuring potential difference up to 100 V? (A) 9 Î© (B) 99 Î© (C) 990 Î© (D) 9990 Î©**

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**A battery of 9 V is connected in series with resistors of 0.2 â„¦, 0.3 â„¦, 0.4 â„¦ , 0.5 â„¦ and 12 â„¦, respectively. How much current would flow through the 12 â„¦ resistor -CBSE Physics**

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**A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 â„¦ resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases? -CBSE Physics**

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**The differential amplifier is connected as shown in the figure(b) above to a single strain gage bridge. Let the strain gage resistance vary around its no load resistance R by Â±1%. GATE-Instrumentational-Engineering-2013**

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**In the circuit shown, V is a sinusoidal voltage source. The current I is in phase with voltage V.**

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**In the circuit shown, V is a sinusoidal voltage source. The current I is in phase with voltage V.**

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