77601. If a resistance R of 1 Ω is connected between A and B in figure, current flowing through R is
77602. Assertion (A): In drawing an electric circuit analogous to a mechanical circuit, spring is replaced by capacitance.Reason (R): The behaviour of a spring and capacitor are similar.
77603. Two coils having equal resistance but different inductances are connected in series. The time constant of the series combination is
77604. The circuit shown in figure is a
77605. For a reactance function H(s)
77606. A sinusoidal current having peak value of 7.07 A is superimposed on dc of 5A. If a hot-wire ammeter is used to measure the combined current in the circuit, it will indicate __________ ampere.
77607. An ideal current source has
77608. The series element in band pass filter is
77609. The flux linkage ψ, self inductance L and current i are related as
77610. Assertion (A): A band elimination filter attenuates signals whose frequencies lie between the cutoff frequencies.Reason (R): A band elimination circuit is very different from band pass circuit.
77611. In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will
77612. Two coupled coils lie in parallel planes such that 50% of magnetic flux produced by one links the other. The coefficient of coupling is
77613. The unit of permeability is
77614. Auto defrost operated by:
77615. The poles and zeros of a positive real functions are real or occur in conjugate pair.
77616. A coil is connected across a 200 V, 50 Hz supply and takes a current of 10 A. The loss in the coil is 1000 W. The impedance and resistance of the coil are
77617. In liquids charge carriers are electrons only.
77618. The current I flowing in the branch is
77619. In figure, the ratio V(s)/I(s) is
77620. Consider the following: Energy storage capability of basic passive elements is due to the fact thatresistance dissipates energycapacitance stores energyinductance dissipates energy Which of the above is/are correct?
77621. In an ac circuit that delivers constant power at varying p.f., the current is
77622. The parameter A of a two port network is equal to
77623. A series RLC circuit is supplied from a variable frequency ac source. The resonant frequency is ω0. The voltage across C is maximum at a frequency
77624. The maximum phase difference between the applied voltage and current in a RLC series current with finite values of R, L, C, and f can be
77625. If figure, I = 2A if R = 20 Ω. When R = 10 Ω current I is
77626. A phasor is
77627. The phase difference (jω - p1 )
77628. Pick the correct statement with respect to following figure.
77629. Permittivity has the units of F/m.
77630. A capacitor used for power factor correction in single- phase circuit decreases
77631. Which one of the following is an active component?
77632. A series RL circuit is switched on to an impulse. A δ(t) at t = 0. Then
77633. Parallel wire transmission line is an example of
77634. A 2-terminal network consists of one of the RLC elements. The elements is connected to an ac supply. The current through the element is 1 A. When an inductor is inserted in series between the source and the element, the current through the element becomes 2 A. What is this element?
77635. Consider the following statements for a driving point function F(jω): Re F(jω) is an even function of ω and is 0 or positive for all values of ω.Im F(jω) is an even function of ω and is 0 or positive for all values of ω.Re F(jω) is an odd function of ω and is 0 or negative for all values of ω.Re F(s) = 0 for Re s = 0. Which one of the statements given above is/are correct?
77636. Which of following is linear and bilateral parameter?
77637. In figure, the switch is initially open. At t = 0 switch is closed. vc (0+) and iL (0+) are
77638. Brine solution density is checked by:
77639. If the peak value of output of a half wave rectifier is 100 V, the rms value is
77640. Assertion (A): is not an LC function.Reason (R): The highest powers of numerator and denominator do not differ by 1.
77641. For a flexible cable, most suitable insulation is
77642. A h is the unit of quantity of electricity.
77643. All network theorems of dc are applicable to ac also with different quantities taken as phasors.
77644. An ac circuit has two branches in parallel. The impedances of the two branches are equal. Their power factors are 0.8 lagging and 0.8 leading. The overall p.f. is
77645. An ideal refrigerants is one whose boiling point is:
77646. A dc voltage source is connected across a series RLC circuit, Under steady state conditions, the applied dc voltage drops entirely across the
77647. The resonance frequency is
77648. Maximum power transfer theorem is applicable to circuits with one source only.
77649. Two coupled coils have self inductance L1 and L2. The coefficients of coupling is k. The mutual inductance is
77650. Laplace transform method enables us to find the response in
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