Q. As per BIS, solid insulators are classified into 6 categories.

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Q. Dielectric constant of air is about 5.

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Q. Consider the following units

1. sec¯¹
2. rad²/sec²
3. sec
4. Ω

The units of R/L, 1/LC, RC and √L/C are respectively

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Q. If f(t) = - f(- t) and f(t) satisfies Dirichlet conditions, then f(t) can be expanded in Fourier series having

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Q. Consider the following

If a network has impedance (1 - j) at a specific frequency, the circuit would consists of series
1. R and C
2. R and L
3.R, L and C

Which of these statements is correct?

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Q. Assertion (A): Power is the rate at which energy is supplied.

Reason (R): Energy = VIt.

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Q. Assertion (A): The s domain impedance of a series R-L circuit is R + sL irrespective of initial conditions.

Reason (R): Complex frequency s = σ + jω.

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Q. If Va = 10 ∠0, Vb = 10 ∠ -120° and Vc = 10 ∠ -240°, then Va2 and Va0 are

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Q. A wire has a diameter d and resistance R. If the diameter is made 3d, the length and material remaining the same, the new value of resistance will be

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Q. The realization of a reactance function gives

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Q. The correct relation between energy and charge is

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Q. Assertion (A): If A = 0.5 ∠ 20°, A² = 0.25 ∠ 40°.

Reason (R): When drawing a phasor diagram, sinusoids may have the same or different frequencies.

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Q. Which statement is incorrect for parallel resonance?

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Q. If a capacitor is charged by a square wave current source the voltage across the capacitor is

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Q. In an R-L-C series circuit, R = 2/√L/C . If R is doubled

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Q. A coil of resistance R and inductance L is connected in series with 10 mF capacitor. The resonant frequency is 1000 Hz. Another 10 F capacitor is connected in parallel with the above capacitor. The new resonance frequency will be

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Q. As the diameter of a wire is doubled, the resistance becomes

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Q. A series resonant circuit has R = 10 Ω, L = 1 μH and C = 1 mF. If R is increased to 20 Ω the resonant frequency

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Q. Assertion (A): Two terminal black boxes of R and C can be identified by plotting their static V-I characteristics.

Reason (R): The V-I characteristic of resistance is a straight line of slope R passing through origin.

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Q. The purpose of earthing electric appliances is

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