Q. A series resonant circuit has inductance L. If L is increased, the resonant frequency

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Q. In a coupled coil the primary has 100 turns and secondary has 200 turns. The primary produces, a flux Φ = e^-t. The coefficient of coupling is 1. The voltages induced in secondary is

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Q. If absolute potential of A is - 8 V and that of B is - 16 V, VAB is equal to

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Q. An RLC series circuit is excited by 200 V, 100 Hz supply. The current is 20 A. If R = 10 Ω, XL = 50 Ω, XC is

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Q. For a given voltage four heating coils will give maximum heat when connected

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Q. A system defined by dy/dt + y = x is initially at rest, and x = u(t) sin 2t then the forced response is K sin (2t - θ). The value of θ given by

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Q. A two branch tuned circuit has a coil of resistance R and inductance L in one branch and capacitance C in the second branch. If R is increased, the dynamic resistance

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Q. In a resistor the current is i and the voltage is v. The rate of dissipation of heat at any time t is

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Q. When two port networks are connected in cascade, it is more convenient to use hybrid parameters.

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Q. The three sides of an admittance triangle denote

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Q. A step voltage E is applied to an R-L series circuit. At t = 0, the current in the circuit is

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Q. To find current in a resistance connected in a network, Thevenin's theorem is used VTH = 20 V and RTH = 5 Ω. The current through the resistance

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Q. A step voltage E is applied to a series R-L circuit. The rate of change of current is maximum at t =

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Q. An RC circuit initially at rest has a step signal. The response V(t) across C is V(t) = 1 - e^(-at), If now there is an initial voltage on C of 2 volts for the same step signal, V(t) is now

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Q. A series circuit having R = 3 Ω and L = 2 H is excited by a 10 V battery. At t = 0+, di/dt is

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Q. Two currents have the same peak value. Wave 1 is sinusoidal and wave 2 is rectangular. The ratio of their heating effects are

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Q. A parallel RLC network has R = 4Ω, L = 4H, C = 0.25F. Then at resonance Q =

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Q. Three resistances of 15 Ω, 10 Ω and 3 Ω are connected in parallel. The overall resistance is

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Q. If Y(s) = s² + 1/s , the network has

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Q. The total inductance of two coils is 60 mH in series aiding connection and 40 mH in series opposing connection. The mutual inductance between coils is

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