Q. The capacitance of a parallel plate capacitor varies as per the equation C(t) = C₀ (1 - cos ωt). It is connected to a battery of V volts. The equation for current is

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Q. Which one of the following is a passive device/Component?

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Q. Assertion (A): When a square periodic wave is applied to an RC circuit, the voltage across capacitor is observed to be a triangular periodic wave.

Reason (R): The RC circuit works as integrator and its time constant is much larger than time period of input wave.

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Q. Assertion (A): In a series resonant circuit current is maximum at resonance.

Reason (R): The inductive and capacitive reactances are equal.

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Q. Laplace transform of a unit doublet U-2 (t) is

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Q. Giga watt is equal to

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Q. A 3 phase star-connected load has one capacitor C in R phase and two equal resistances in Y and B phases.The phase sequence is RBY. Then

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Q. Reciprocity theorem is applicable to

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Q. The first and the last critical frequencies (singularities) of a driving point impedance function of a passive network having two kind of elements, are a pole and a zero respectively. The above property will be satisfied by

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Q. An ac network has two sources of the same frequency. The currents in one branch when the sources act independently are 10 ∠30° A and 10 ∠60° A. When both sources act, the current in the branch should be

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Q. A network is said to be non-linear if it does not satisfy

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Q. A reactance function

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Q. At a frequency less than the resonant frequency

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Q. For representing two sinusoidal voltages on a phasor diagram

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Q. While using Maxwell bridge, the Q factor of a coil is obtained as

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Q. The colour code of a carbon resistance is yellow-violet-orange silver. The value of resistance is

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Q. Choose the correct option

1. Transit period is the time between two steady state
2. Transient Response is the response due to internal energy stored in circuit
3. Transit response is also called natural response
4. Transit response arises due to presence of C and L in the circuit
5. Transit is due to R, L, C in the circuit

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Q. If current is less than 20 mA and time of contact is very small, the effect of current on human body is likely to be temporary.

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Q. For an RC admittance function

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Q. If resistance is 20 Ω and inductance is 2 H in a R-L series circuit, then time constant of this will be

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