Q. A 60 W, 23 V bulb is used for 45 minutes. The electrical energy consumed in commercial units is

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Q. In an ideal current source, the source resistance is zero.

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Q. A choke coil has a resistance to reactance ratio of 0.2. The power factor of the choke coil is

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Q. Two capacitors of 1 μF and 2 μF are connected in series across a 10 V dc battery. After the capacitors have been charged, the charges across the two capacitors will be

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Q. A series RLC circuit has Q = 5. A voltage of 10 V rms is applied to it. At resonance, the voltage across C is

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Q. A capacitor having capacitance C is raised to voltage V. The energy stored will be

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Q. In an R-L circuit, the impedance is 30 Ω at a frequency of 100 Hz. At 200 Hz, the impedance should be

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Q. The electric energy required to raise the temperature of a given amount of water is 1000 kWh. If heat losses are 25%, the total heating energy required is __________ kWh.

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Q. Two phasors having rms values V1 and V2 which are added to give a phasor having rms value V3. V3 is maximum if phase angle between V1 and V2 is

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Q. A current of 1 A in the coil of an iron cored electromagnet cause a flux density of 0.2.T. If the current is 2 A, B=

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Q. In a practical current source, the load current

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Q. A resistor R of 1 Ω and two inductor L1 and L2 of inductances 1 H and 2 H respectively, are connected in parallel. At some time, the current through L1 and L2 are 1 A and 2 A, respectively. The current through R at time t = ∞ will be

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Q. A 10 ohm resistance and a 10 ohm capacitor are connected in series across a 100 V ac supply. The rms voltage across resistance is

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Q. When a 10 K, 10%, 1/4 Ω resistor is connected in series with a 12 K, ± 1%, 1/4 Ω resistor, the resulting combination has the following specifications

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Q. An m derived low pass filter has fc = 1000 Hz and m = 0.6. This filter will have infinite attenuation at

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Q. A current 10 sin (200t) A flows through a 5 mH inductance. The expression for voltage is

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Q. If operator 'a' = 1 ∠120° then (1 + a) =

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Q. A current wave is i = 100e^(-60t) The initial and final values of current are

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Q. Assertion (A): The impedance of a series resonant circuit is minimum at resonance.

Reason (R): Resonance condition implies unity power factor condition.

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Q. The internal impedance of a source is 3 + j 4 Ω. It is desired to supply maximum power to a resistive load. The load resistance should be

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