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You Are On Multi Choice Question Bank SET 1266

63301. A capacitor whose capacitance Ct = C0 (1- cos ωt) is fed by a sinusoidal voltage v = V0 sin ωt. The equation for current i is





63302. Figure shows an RC circuit. The magnitude plot V2/V1





63303. Assertion (A): In a circuit having high inductance, reactive power may be more than apparent power.Reason (R): Reactive power = VI sin θ.





63304. A two branch parallel circuit has a 10 Ω resistance and 0.5 H inductance in one branch and a 100 μF capacitor in the second branch. It is fed from 100 V ac supply. At resonance, the source current is





63305. In figure, A is ideal ammeter having zero resistance. It will read __________ ampere.





63306. Threshold of perception occurs at a current of about 1 mA.



63307. The current wave shown in figure is applied by a 0.1 F capacitor at t = 0. At t = 0+, the voltage across capacitor is





63308. A current increasing at the rate of 1 A/s is passed through 1 F capacitor. At t = 0, i = 0. The charge stored after 1 second is





63309. An RLC series circuit has R = 30 Ω, XL = 30 Ω and XC = 30 W. Its impedance is





63310. R, L and C are in parallel. The circuit is switched on to a constant current source I at t = 0. At t = ∞ the current through inductance is I.



63311. A 2 mH inductor with some initial current can be represented as shown below, where s is the Laplace transform variable. The value of initial current is





63312. As temperature increases, the temperature coefficient of metals increases.



63313. In a 3 phase system, the zero sequence component of line to line voltages is zero





63314. Magnetic effect of current is used in generators but not in motors.



63315. For a nonlinear resistance





63316. The Z parameters Z11 and Z21 for the 2-port network in the figure.





63317. For the wave shown in figure, the average value is





63318. Assertion (A): For a physically realisable driving point function, the degree of numerator and denominator should be equal.Reason (R): The sum of positive real functions is real.





63319. In the figure circuit, V1 = 40 V. When R is 10 Ω. When R is zero, the value of V2 will be





63320. Compaction of soil is measured in terms of:





63321. In the circuit shown in the given figure, RL will absorb maximum power when its value is





63322. In an RC series circuit excited by dc voltage E, the current at t = 0 is





63323. The current through a 10 Ω resistance in a dc circuit having two emf sources is 3A. If this resistance is changed to 20 Ω, the new value of current will be





63324. A planar graph has 6 nodes and 7 branches. The number of meshes in the dual graph is





63325. An ac voltage 20 sin 1000t feeds an R-C series circuit. R = 8 Ω and active power is 4 W. The power factor is





63326. For a sine wave the average value is calculated over half the cycle.



63327. Two resistances of 2 Ω each are connected in series. A shunt having zero resistance is connected across the combination. The overall resistance will be





63328. The poles and zeros of a positive real function





63329. In a linear circuit, the superposition principle can be applied to calculate the





63330. If A = 7 ∠15, A2 is





63331. The colour coding of a resistors shows 100 K, ± 10%. When the resistance was measured with an ohmmeter, it read





63332. The output voltage of a charger is





63333. The circuit in figure has reached steady values with switch open. If switch is closed at t = 0 the voltage across 2 μF capacitance at t = 0+ is





63334. In the circuit of figure





63335. As per BIS, solid insulators are classified into 6 categories.



63336. Dielectric constant of air is about 5.



63337. Consider the following units sec-1rad2/sec2secΩ The units of , RC and are respectively





63338. In a conductor, voltage v, conductance G and charges q are related as



63339. The current wave in figure is passed through 3 H inductor. The voltage across inductance during the period 2 < t < 3 seconds is





63340. In figure, the charge on 0.8 μF capacitor is





63341. Maximum power transfer theorem finds application in





63342. In a series L-C circuit fed by ac voltage, voltage drops across L and C are 40 V and 30 V respectively. The supply voltage is





63343. In a reactance function





63344. In figure, the switch is closed at t = 0 when current through inductor is 6 A, the rate of change of current through resistor is 6 A/s. The value of L is





63345. In figure, the switch is closed at t = 0. At t = 0+, di/dt = 4 A/s. Then V =





63346. In figure V is ideal voltmeter having infinite resistance. It will read __________ volt.





63347. The equivalent inductance seen at terminals A - B is





63348. If sequence currents Ia1 = 2 ∠- 90°, Ia2 = 0.2 ∠ 90° and Ia3 = 1.8 ∠ 90°, Ia =





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