Alternating Current questions
577 published questions with worked solutions.
- If a bulb is connected first with D.C. and then A.C. of same voltage, then it will shine brightly with [RPET 2000]
- An LCR circuit contains R=50 , L=1 mH and C=0.1 . The impedance of the circuit will be minimum for a frequency of [Bihar MEE 1995]
- In an LCR circuit, at resonance [K CET 2015]
- An alternating e. m. f. of frequency f= 1 2 LC is applied to a series LCR circuit. For this frequency of the applied e. m. f....
- A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when [NEET...
- In an electrical circuit R, L, C, and A.C. voltage source are all connected in series. When L is removed from the circuit, the...
- Same current is flowing in two a.c. circuits. First contains only inductance and second contains only capacitance. If frequency...
- An A.C. voltage source of variable angular frequency and fixed amplitude V connected in series with a capacitance C and an...
- A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an A.C. source, of 200 volt, 100 Hz is...
- An A.C. ammeter is used to measure current in a circuit. When a given direct current passes through the circuit, the A.C. ammeter...
- The output power in step-up transformer used in practice is
- 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,...
- In a step-up transformer, the turn ratio is 1: 2. A Leclanche cell (emf = 1.5 V) is connected across the primary. The voltage...
- The current flowing in a step-down transformer 220 V to 22 V having impedance 220 is
- In an ideal transformer, the voltage is step-down from 11kV to 220 V. If the primary current be 100 A, the current in the...
- In an ideal transformer,
- When power is drawn from the secondary coil of the transformer, the dynamic resistance
- In step-up transformer, the relation between number of turns in primary (N_p) and number of turns in secondary (N_s) coils is
- A transformer is used to light 140 W, 24 V lamp from 240 VAC mains. The current in the mains is 0.7 A. The efficiency of...
- Voltage in the secondary coil of a transformer does not depend on
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