Alternating Current questions
577 published questions with worked solutions.
- Alternating current cannot be measured by D.C. ammeter because [AIEEE 2004]
- If e_0 represents the peak value of the voltage in an A.C, circuit, the r.m.s. value of the voltage will be
- A generator produces a voltage that is given by e = 240 120t, where t is in seconds. The frequency and r.m.s. voltage are [MP PMT...
- A multimeter reads a voltage of a certain A.C. source as 100 V. What is the peak value of voltage of A.C. source?
- In an A.C. circuit, the reactance of a coil is 3 times its resistance. The phase difference between the voltage across the coil...
- An A.C. voltage is applied to a resistance R and inductor L in series. If R and the inductive reactance are both equal to 3 , the...
- For series LCR circuit, the wrong statement is [RPMT 1997]
- In a circuit L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage...
- In AC series circuit, the resistance, inductive reactance and capacitive are 3 , 10 and 14 respectively. The impedance of the...
- A lamp consumes only 50% of maximum power applied in an A.C. Circuit. What will be the phase difference between applied voltage...
- In an A.C. circuit, e and I are given by, e=100 (100t) volt, I=100 (100t+ 3 ) mA. The power dissipated in circuit is [RPMT 1997]
- In a series circuit, R=300 , L=0.9 H, C=2.0 and =1000 rad/s. The impedance of the circuit is
- In LCR series circuit, an alternating e. m. f. 'e' and current 't' are given by the equations e=100 (100t) volt and i=100 (100t+...
- The average power dissipated in A.C. circuit is 2 watt. If a current flowing through a circuit is 2 A and impedance is 1 , what...
- A resistance R draws power P when connected to an AC source. If an inductance is now placed in series with the resistance, such...
- A 220 V, 50 Hz A.C. source is connected to an inductance of 0.2 H and a resistance of 20 ohm in series. What is the current in...
- A coil of inductive reactance 31 has a resistance of 8 . It is placed in series with a condenser of capacitive reactance 25 . The...
- The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux = _0+4t, where is in...
- In LCR circuit, the capacitance is changed from C and 2C. For the same resonant frequency, the inductance should be changed from...
- An electric current has both D.C. and A.C. components. D.C. component of 8 A and A.C. component is given as I=6 t A. So I_ rms...
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