Q. The temperature coefficient of copper is 0.00393 at 20° C. At 50° C the temperature coefficient is

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Q. To determine the polarity of voltage drop across a resistor, it is sufficient to know

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Q. A sawtooth current wave is passed through a resistance

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Q. Which of the following is the poorest conductor of electricity?

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Q. The value of the inductance of coil in which a current increases linearly from zero to 0.1A in 0.2 second producing a voltage of 5 volts is __________ .

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Q. An RLC series circuit is excited by an ac voltage v = 1 sint. If L = 10 H, C = 0.1 F peak value of voltage across R is

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Q. If all other parameters are the same, a capacitor with mica as dielectric has higher capacitance than air capacitor.

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Q. If V = 100 ∠ 16°, the √(V) is

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Q. In an underdamped RLC series circuit, the natural frequency is ωn. The frequency of damped oscillations is

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Q. A dc network has 3 independent nodes and 4 loops. In total analysis, the number of equations is

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Q. A series circuit has R = 5 Ω and C = 10 μF. It is switched on to a 12 V dc battery at t = 0. The current in the circuit will be maximum

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Q. The pole of a reactive function

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Q. Wave A starts its positive half cycle at ωt = 30° and wave B starts its positive half cycle at ωt = 75° then wave B is leading wave A by 45°.

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Q. A resistance R, inductance L and capacitance C are in series. The source frequency is adjusted to be equal to resonant frequency. The lower half power frequency is ω₁. Another resistance R is added in series with the circuit. The new lower half power frequency will be

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Q. The strength of controlled voltage source depends on

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Q. A band elimination constant k filter has series resonant circuit in series arms.

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Q. If e = 110 sin (ωt + π/3) and i = 5 sin (ωt - π/3), the impedance of the circuit is

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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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