Alternating Current questions
577 published questions with worked solutions.
- In non-resonant circuit, what will be the nature of the circuit for frequencies higher than the resonant frequency?
- A capacitor 50 , F is connected to a power source V = 220 50t (V in volt, t in second). The value of rms current (in ampere) is
- A bulb is connected first with DC and then AC of same voltage, then it will shine brightly with
- The maximum voltage in AC circuit is 282 V. The effective voltage in AC circuit will be
- A generator produces a voltage that is given by V = 240 120t, where t is in second. The frequency and rms voltage are
- An alternating current is given by the equation i = i_1 t + i_2 t. The rms current is given by
- In a series resonant R − L − C circuit, the voltage across R is 100 V and the value of R = 1000 . The capacitance of the...
- An alternating emf of 0.2 V is applied across an L − C − R series circuit having R = 4 , C = 80 F and L = 200 mH . At resonance...
- An AC circuit contains resistance of 12 and inductive reactance 5 . The phase angle between current and potential difference,...
- A coil has inductance 2 H . The ratio of its reactance, when it is connected first to an AC source and then to DC source, is
- An alternating voltage V = 200 2 (100 ,t) volt is connected to 1 , F capacitor through AC ammeter. The reading of ammeter is
- Same current is flowing in two AC circuit, First contains only inductance and second contains only capacitance. If frequency of...
- AC measuring instruments measures
- If the inductance and capacitance are both doubled in L-C-R circuit, the resonant frequency of the circuit will
- In L-C-R circuit, power factor at resonance is
- What is the value of inductance L for which the current is a maximum in a series L − C − R circuit with C = 10 F and = 1000 s^ -1...
- In a circuit, the current lags behind the voltage by a phase difference of /2, the circuit will contain which of the following?
- In an AC circuit, the current lags behind the voltage by /3. The components of the circuit are
- In series L-C-R circuit, the capacitance is changed from C to 2 C. The inductance should be changed from L to .. to obtain same...
- If an AC main supply is given to be 220 V. What would be the average emf during a positive half cycle?
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