77351. In ac circuits maximum power is delivered to a load if load impedance is conjugate of source impedance.
77352. In a series R-L-C circuit at the resonant frequency the
77353. The transfer function H(s) of a system is given by Given that understeady state conditions, the sinusoidal I/P and 0/P are respectively x(t) = cos 2t and y(t) = cos (2t + Φ), then the angle Φ will be
77354. If Fourier transform of f(t) is F(jω), then which pairs of time functions and Fourier transforms are matched f (t + 2) - ej2ω F(jω)f (-0.5t) - 2F (-2jω) - Select the answer using the following codes
77355. In a power system, reactive power is necessary for
77356. A unit impulse voltage δ (t - b) is applied to an inductor with inductance L. The current through L is
77357. A periodic voltage has following values for equal time intervals changing suddenly from one value to next, 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, -5, -10 etc. then rms value of the waveform is
77358. The impedance of a coil above self-resonant frequency is
77359. Wire-wound resistors are unsuitable for use at high frequencies because they
77360. In figure, the tree branches are bdf. The fundamental loops include
77361. A function Z(s) has zero at infinity if
77362. If f1 and f2 and half-power frequency and f0 be resonant frequency, the selectivity of R-L-C series circuit is given by
77363. Assertion (A): When capacitor is fed by a dc voltage given a capacitor behaves as short circuit at t = 0 and open circuit at f = ∞.Reason (R): The impedance of a capacitor is
77364. P(s) = s4 + s3 + 2s2 + 4s + 3Q(s) = s4 + 2s3 + s Which one of the following statements in correct for above P(s) and Q(s) polynomials?
77365. The material used for fuse must have
77366. The function δ (t - b) is a
77367. The exposed vertical surfaces perpendicular to window or door frame are called:
77368. In ionic bonding, the valence electron is donated by one atom and accepted by the other atom.
77369. If Ia, Ib, Ic are line currents and Ia2 is the negative sequences component of Ia then
77370. For stable network, the real part of poles and zeros of driving point function must be
77371. Maximum power from a source having internal resistance Ri is delivered to a resistive load RL, if
77372. Terra-watt is equal to
77373. A capacitor does not allow sudden changes
77374. Assertion (A): Thevenin's theorem helps us to find current in a branch of a network for different values of impedances of that branch.Reason (R): Thevenin's equivalent circuit replaces a network by a voltage source in series with impedance.
77375. If a 'live' conductor of a public supply touches earth metal
77376. If a fuse is higher than required current rating is employed in a circuit, it will
77377. A series circuit has fixed resistance and variable reactance. The impedance locus will be a straight line parallel to Y-axis.
77378. The dual of a loop is
77379. If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be
77380. Consider the following statements : Tellegen's theorem is applicable to any lumped networks.The reciprocity theorem is applicable to linear bilateral networks.Thevenin's theorem is applicable to two- terminal linear active networks.Norton's theorem is applicable to two-terminal linear active networks. Which of these statement are correct?
77381. An RLC series circuit is excited by a step voltage E. The units of roots of characteristic equation are
77382. An excitation is applied to a system at t = T, and its response is zero for -∞ < t < T, such a system is
77383. Bandwidth will be
77384. In carbon resistor colour code, the fourth band indicates tolerance.
77385. For any given two port network, any parameter set can be determined from measurements made at the two ports.
77386. For 200V r.m.s. value triangular wave, the peak voltage will be
77387. According to initial value theorem which one is correct
77388. A two terminal black box contains one of the elements R, L, C. The black box is connected to 220 V as supply. The current is I, when a capacitance of 0.1 F is connected in series between the source and box, the current is 2I. The elements is
77389. If Z(s) is positive real, then where k has only positive real values is also positive real. This hypothesis was first given by
77390. For a voltage transfer function H(s), realizable by RLC network, the following statements are made H(s) cannot have a pole at s = 0H(s) cannot have a pole at s = ± j4H(s) cannot have a pole at s = ∞H(s) cannot have a pole at s = + 2 Of these statements
77391. In figure the effective resistance faced by voltage source is
77392. A two port network is symmetrical if
77393. In a varistor, as the voltage increases beyond a certain value, its resistance
77394. Current through a charging capacitor exhibits
77395. A battery charger can drive a current of 5A with 1Ω resistance connected at its output. If it can charge 2 V battery at 7 A rate, its Thevenin's equivalent circuit will be
77396. For the given circuit, the current I is
77397. Assertion (A): In an R-L circuit having low resistance, current lags the voltage by nearly 90°.Reason (R): Power factor of a series RL circuit is R/Z.
77398. Two coils are so wound that 60% of the flux of one links the other. The coefficient of coupling is
77399. In the graph of figure, the total number of trees is
77400. In a sine wave, maximum rate of change of voltage occurs at
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