226. In figure, capacitor is uncharged. The switch is closed at t = 0 at t = 0+ di/dt is
227. In a series RLC circuit, R = 2 kΩ, L = 1H and The resonant frequency is
228. The function Z(s) has a pole at infinity if
229. An input voltage V(t) = 10 2 cos (t + 10°) + 10 3 cos (2t + 10°)V is applied to a series combination of resistance R = 1 kΩ inductance L = 1H. The resulting steady-state current i(t) in ampere is
230. A thermal power plant has an efficiency of 0.4. If 0.6 kg of coal is burnt to generate 1 kWh, the calorific value of coal is
231. An RC series circuit has R = 20 Ω and XC = 20 Ω. Then Z =
232. An inductance having XL = 5 Ω and a capacitance having XC = 5 Ω are connected in parallel across 100 V, 50 Hz supply. The current drawn from source is
233. In figure the total inductance of the circuit is
234. In the network of figure, the voltage drops across R1, R2, R3 are 6 V, 8 V and 12 V with polarities as shown. The value of R3 is
235. Assertion (A): Millman's theorem helps in replacing a number of current sources in parallel by a single current source.Reason (R): Maximum power transfer theorem is applicable only for dc, circuits.
236. Double integration of unit step function leads to
237. A conductor has a cylindrical shape with a diameter d. Its resistance is 2 Ω. It is recast into a cylindrical conductor of diameter 0.3d. The resistance of new conductor is likely to be
238. One commercial unit of energy is equal to
239. In figure which is correct at any time t
240. Two coupled coils with self inductances of 4 mH and 16 mH are connected in series. The maximum possible value of inductance can be
241. In using KCL it is necessary that current leaving a node is written as negative.
242. A resistor is rated at 0.75 watt, 1 kΩ. Its current rating is
243. The three sides of an admittance triangle denote
244. A step voltage E is applied to an R-L series circuit. At t = 0, the current in the circuit is
245. 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
246. In figure, the magnitude of V
247. A step voltage E is applied to a series R-L circuit. The rate of change of current is maximum at t =
248. The driving point impedance of a network is The number of energy storing elements in the network is
249. Two currents have the same peak value. Wave 1 is sinusoidal and wave 2 is rectangular. The ratio of their heating effects are