Alternating Current questions
577 published questions with worked solutions.
- The process of conversion of alternating current into direct current is called as
- The current obtained from a simple filter less rectifier is
- When output current is in one direction only, but is continuously varying in value, then it is called
- In which of the following circuits a transformer with C.T. (centre tap terminal) in secondary coil is required:
- The difference in the working of an amplifier and a step up transformer is
- The process of conversion of alternating current into direct current is called as
- A capacitor of capacity C and reactance X if capacitance and frequency become double then reactance will be : -
- The peak voltage in the output of a half wave diode rectifier fed with a sinusoidal signal without filter is 10V. The d. c....
- The core of a transformer is laminated because:-
- A coil of inductive reactance 31 has a resistance of 8 . It is placed in series with a condenser of capacity reactance 25 . The...
- The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux linked with the...
- What is the value of inductance L for which the current is a maximum in a series LCR circuit with C = 10 F and = 1000 s ^ -1 ?
- A transformer is used to light a 100W and 110V lamp from a 220V mains. If the main current is 0.5A, the efficiency of the...
- Power dissipated in an LCR series circuit connected to an a.c source of emf is:
- A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts . If the efficiency...
- A coil has resistance 30 ohm and inductive reactance 20 Ohm at 50 Hz frequency. If an ac source, of 200 volt , 100 Hz , is...
- An ac voltage is applied to a resistance R and an inductor L in series. If R and the inductive reactance are both equal to 3 ,...
- In an ac circuit an alternating voltage e = 200 2 100t volts is connected to a capacitor of capacity 1 F . The r.m.s. value of...
- In an electrical circuit R, L, C and an a.c voltage source are all connected in series. When L is removed from the circuit, the...
- A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when -
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