Title 3. ALTERNATING CURRENT - LEVEL-VI_Final (PART-II) (85-118).pdf ✅

NISHITH Multimedia India (Pvt.) Ltd., 85 JEE - ADVANCED - VOL - CURRENT ELECTRICITY NISHITH Multimedia India (Pvt.) Ltd., JEE ADVANCED - VOL-VII ALTERNATING CURRENT ALTERNATING CURRENT LEVEL-VI SINGLE ANSWER QUESTIONS RMS & Average value of AC 1. If a direct current of value of ‘a’ ampere is superimposed on an alternating current I b t  sin flowing through a wire, what is the effective value of the resulting current in the circuit? a) 2 2 a b  (b) 2 2 2 b a  (c) 2 2 2 a  b (d) 2 2 3 b a  AC across L-R, L-C, L-C-R of circuit 2. An alternating voltage of 200 volt, at 400 cycles/sec is applied in a circuit containing an inductance of 0.01 henry in series with a resistance of 22.8 ohms. The voltage across the inductance is a) 148.2 volt b) 392.4 volt c) 74.1 volt d) 196.2 volt 3. If the readings V1 and V3 are 100 volt, each then reading of V2 is: a) 0 volt b) 100 volt c) 200 volt d) cannot be determined by given information 4. In the a.c. circuit shown in the figure. The supply voltage has a constant r.m.s, value V, but variable frequency f. Resonance frequency in hertz is ~ R=50 L   1 F H   1 V = 300 V (a) 10 (b) 100 (c) 1000 (d) 200 5. If the power factor is 1/2 in a series RL circuit with R = 100. If AC mains, 50 Hz is used, then L is (a) 3  henry (b)  henry (c) 3 henry (d) 3 henry 6. An inductor  XL  2  a capacitor  XC  8  and a resistance 8 are connected in series with an ac source. The voltage output of A.C source is given by v =10 cos 100t . The instantaneous p.d. between A and B, when it is half of the voltage output from source at that instant will be: a) 24 7 volts b) 24 5 volts c) 7 24 volts d) 5 24 volts 7. A resistor of resistance 100 is connected to an AC source of emf     1 12V sin 25 s t     . find the energy dissipated as heat during t=0 to t=1.0ms a) 0.61 10 J  b) 0.61 10 J   c) 4 2.61 10 J   d) 6 2.61 10 J  