Q. Two sinusoidal waves 1 and 2 have peak values Vm1 and Vm². Wave 1 is leading wave 2 by ∠θ. Which of the following is correct?

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Q. Ohm's law is valid for

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Q. In an R-L circuit excited by a battery of voltage E, the current and voltage across resistor are 1- e^-t and 2(1 - e^-t) respectively. If there were an initial current of 2 A in the inductance, the voltage across resistance would have been

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Q. Stray capacitance is important at low frequencies.

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Q. A non-linear element has zero resistance.

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Q. In a RL circuit, the angle, θ by which the current lags the voltage is

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Q. Assertion (A): The Laplace transform of a ramp is 1/s².

Reason (R): The integral of a unit step function gives an impulse function.

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Q. A certain network has two ideal voltages sources and a large number of ideal resistances. The power consumed in one of the resistances is 4 W when either of two sources is active and the other source is active and the other source is short circuited. When both sources is short circuited.When both sources are active, the power consumed in the same resistor would be

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Q. A coil of resistance R and inductance L is connected in series with 5 μF capacitor. The source frequency is equal to resonance frequency and circuit current is 0.5 A. Another 5 F capacitor is connected in parallel with the above capacitor. The circuit current will be

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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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