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Transcript

To resistances of 5 Ohm and 20 Ohm are connected in parallel . The parallel combination is connect in series with 1ohm resistance and series-parallel combination is connected across a dc source of 100V. The current supplied by the source is A. 25A B. 20A C. 5A D. 4A A. B. C. D. Two resistances each of 10 Ohm and 20 Ohm are connected in parallel across a dc voltage source. The current through the 10 Ohm resistance is Equal to current supplied by the voltage source. Equal to the current through the 20 Ohm resistance. 50% of the current through the 20 Ohm resistance 200% of the current through the 20 Ohm resistance. Find the equivalent resistance between point A and B in following combination of resistors having resistance R, respectively a. 3/5R b. 2R c. 8/5R d. 5R/8 The time constant of a circuit containing, resistance of R Ohms in series with an inductance of L henry is equal to A. R*L B. R/L C. L/R D. L+R Given n capacitors with charge Q and capacitance C, will you get the greatest energy stored : A. In series C. In parallel B. They will be the same D. None A 320H coil is in series with a 3.3k resistor. How long does it take for current to build up to its full value? A. 5.28s B. 5.28ms C. 5.28ms D. 0.528s A switch, a 220 resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed? A. 91mA B. 78mA C. 57mA D. 400mA Three capacitors of C microfarad are connected first in series and then in parallel, the equivalent capacitance is A. greater in series combination. B. greater in parallel combination. C. Same in the two combinations. D. None of these In the given circuit shown, the resistances are 2 ohms, 12 ohms and 24 ohms respectively, calculate the power consumed in 2 ohms resistor A. 2.88W B. 7.68W C. 3.84W D. 2.4W A. C. What happens to total resistance in a circuit with parallel resistors if one of them opens? It increases B. It halves It remains the same D. It decreases In a 20V RC circuit, if 20V is measured across the resistor and 40V across the capacitor, the applied voltage is A. 50V B. 55V C. 60V D. 45V Statement 1 : Inductor doesn’t accept sudden changes in current. Statement 2 : Inductor doesn’t accept sudden changes in voltage. A. Statement 2 is correct B. Statement 1 is correct C. Both are correct D. None of the above The unit of inductor is Henry. It can also be represented as : A. V/sec B. V-Sec C. V/A D. V-Sec/A