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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Q. The internal impedance of a source is 3 + j 7 Ω. For maximum power transfer, load impedance should be

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Q. A wave trap is a

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Q. In an ac series RLC circuit the maximum phase difference between any two voltages can be

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Q. In a series circuit with XL constant and R variable the current locus lies in the third quadrant.

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Q. One coulomb charge is equal to the charge on

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Q. Two capacitors of 16 μF each are connected in series. Another capacitor of 16 μF is connected in parallel with this combination. The total capacitance will be

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Q. Assertion (A): Operator has a value 1 ∠ - 90° or 1 ∠ 90°.

Reason (R): Operator 'a' has a value 1 ∠ 120°.

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