Alternating Current questions
577 published questions with worked solutions.
- A coil of 4 mH and a capacitor of 10 are in series with an A.C source along with 5 resistances. If inductive reactance is equal...
- An A.C. voltage of r.m.s. value 0.1 V is applied to an LCR series circuit in which L = 100 H and C = 4 10^ -8 F and R = 2 . The...
- A resistor R, an inductor L and a capacitor C are connected in series to an oscillator of frequency n. If the resonant frequency...
- A coil has an inductance of 0.7 henry and is joined in series with a resistance of 220 . When an alternating e.m.f. of 220 V at...
- A group of electric lamps having a total power rating of 1000 W is supplied by an A.C. voltage e = 200 (310t + 60^ ). The r.m.s...
- What is the r.m.s. value of an alternating current which when passed through a resistor produces heat which is thrice of that...
- A transformer is used to light 100 W – 100 V lamp from 220 V mains. If the main current is 0.5 A, the efficiency of the...
- The output power in step-up transformer used in practice is _________ [G CET 2014]
- A transformer connected to 220 volt line shows an output 2 A at 11000 volt. The efficiency is 100%. The current drawn from the...
- A 220-volt input is supplied to transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of...
- What is increased in step-down transformer? [MP PET/PMT 1998, CPMT 1999]
- Statement 1: A transformer cannot work on D.C. supply Statement 2: D.C. changes neither in magnitude nor in direction
- A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A,...
- A step-down transformer has 50 turns on secondary and 1000 turns on primary winding. If a transformer is connected to 220 V, 1 A...
- In an A.C. circuit, peak value of voltage is 423 volt. Its effective voltage is
- The ratio of peak value and r.m.s value of an alternating current is
- E.m.f. is given by, e = 200 50t. The r.m.s. value of current in a circuit of resistance 50 is
- If instantaneous current is given by, I = 4 ( t + ) ampere, then the r.m.s. value of current is [RPET 2000]
- A.C. voltmeter is connected to a source of e_0 = 141.4 volt, then it will read
- An alternating voltage, E = 200 2 (100t) is connected to a 1 microfarad capacitor through an A.C. ammeter. The reading of the...
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