77001. The current in an RL series circuit is 1 - e-t amperes. Then di/dt is
77002. Given , and f(t)t → ∞ is . The value of k is
77003. In a one port network . It is excited by a unit step current. The initial and final values of voltage across the network impedance are
77004. In the circuit of figure, the current through battery E2 is
77005. In figure, the current supplied by battery at t = 0.5s is
77006. A source of angular frequency 1 rad sec has a source impedance consisting of 1 Ω resistance in series with 1 H inductance. The load that will obtained the maximum power transfer is
77007. When tracing through a resistance we always get a voltage drop.
77008. A copper coil has a resistance of 40 ohm at 20°C. At 100°C the resistance is likely to be
77009. Assertion (A): In a parallel circuit with three branches having R, L and C respectively and fed by a step current I, the current through inductance is always zero.Reason (R): The time constant of R-L circuit is L/R.
77010. When a source is delivering maximum power to a load through a network, the ratio of power delivered to the source power
77011. The number of electrons in motion at the instant of positive peak of a symmetrical ac wave is the same as that at the instant of negative peak.
77012. In figure, the current through R, after the steady state condition is reached, is
77013. A two branch parallel tuned circuit has 100 Ω resistance and 0.1 H inductance in one branch and 10-6 F capacitor in the other. At resonance frequency, the dynamic resistance is
77014. Special circuits using neon tubes, contact relays and capacitors are used in many domestic appliances. The role of capacitor in figure is to
77015. A series R, L, C circuit has R = 2Ω, L = 1H, C = 1 μF. It is connected to an ac variable frequency source of peak voltage 10 V. At resonance the power supplied by the source will be
77016. In figure, the power associated with 3 A source is
77017. In the circuit shown in figure the inductor current and capacitor voltage are given at a time t. At this instant i is __________ A and is __________ A/sec.
77018. In the Bode plot, of , the phase at w = 15 is
77019. The inductance of an air cored coil is 2 H. The number of turns is made 3 times, all other quantities remaining the same. The new value of inductance will be 2 2
77020. j6 =
77021. A loudspeaker transformer has a turns ratio of 20 : 1. The speaker impedance is 20Ω. Primary impedance of transformer is
77022. For splicing tension reinforcement in flexural members,the most suitable location is:
77023. Assertion (A): The polynomial s3 + 6s2 + 12s + 8 is Hurwitz.Reason (R): In a Hurwitz polynomial all coefficients are non-negative.
77024. A dc network has an open circuit voltage of 5 V. When its terminals are short circuited a current of 5 A flows through the short circuit. If the short circuit is removed and a resistance of 1.5 Ω is connected across its terminals, the current will be
77025. A coil of resistance R and inductance L has a capacitor C in parallel with it. The source frequency is adjusted to a value equal to resonant frequency. Another capacitor C is added in parallel with the above circuit, the source current will
77026. In the circuit of figure the current through 3 Ω resistance at t = ∞ is
77027. In figure, i(0-) and v(0-) are zero. The switch is closed at t = 0, i(0+) and (∞) are
77028. Tellegen's theorem is applicable to
77029. Which of the statement is correct?
77030. A system function is . The system is at rest for t < 0, i(t) = 2u(t) where u(t) is an unit step, V(t) for t > 0 is given by
77031. Discharge breakdown in insulators is due to voids.
77032. If a coil has diameter 'd' number of turns 'N' and form factor 'F' then the inductance of coil is proportional to
77033. In figure, the switch has been closed position for a long time. At t = 0 the switch is opened. At t = 0+, the current ic is
77034. For the port shown, the short circuit network function at port 2 is given by
77035. A material for permanent magnet should have
77036. Which of the following frequencies has the greatest period?
77037. A variable resistance R and capacitive reactance XC are fed by an voltage. The current locus is
77038. Two wires A and B have the same cross-section area and are made of the same material. RA = 600 Ω and RB = 100 Ω. The number of times A is longer than B is
77039. A dc machine has 6 poles all connected in series. Each pole has 9 H inductance and field current is 2 A. Total inductance and total energy stored are
77040. In a series RLC circuit the dB level of currents at half power frequencies as compared to current at resonance is
77041. A series RL circuit is initially relaxed. A step voltage is applied to the circuit. If t is the time constant of the circuit, the voltage across R and L will be same at time t equal to
77042. In figure, the transmission parameters are A = C = 1, B = 2 and D = 3. Then Zin =
77043. A sinusoidal voltage is written as v = Im (R2 + XC2)0.5 sin 314 t. Its peak value and frequency are
77044. If A = 10 + j then logeA is
77045. Which synthesis procedure requires the use of mutual inductance?
77046. In figure the rms value is
77047. A series RL circuit is excited by a voltage v(t) = Vm sin (ωt + Φ). The transient current will be zero if
77048. Consider the following from the point of view of possible realization as driving point impedances using passive elements Among these
77049. A series circuit has R = 5 Ω and C = 10 μF. At t = 0 it is switched on to a 10 V dc battery. The maximum current in the circuit is
77050. For the same sectional area which beam will deflect least:
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