In A.C. circuit having only capacitor, the current

The ratio of peak value and r.m.s. value of an alternating current is

The maximum value of a.c. voltage in a circuit is 770V. Its r.m.s. Value is

In a pure inductive circuit, the current

The instantaneous current in an ac circuit is I=2.0 sin314t, what is its frequency?

An A.C source is connected to a resistive circuit. Which of the following is true?

What is the effective value of current?

In a sinusoidal wave, average current is always _______ rms current.

Using an A.C. voltmeter, the potential difference in the electrical line in a houseis read to be 234 volts. If the line frequency is known to be 50 cycles persecond, the equation for the line voltage is

The reactance of a capacitor C is X. If both the frequency and capacitance be doubled, then new reactance will be

An Inductor may store energy in

For high frequency, capacitor offers

Choose the correct statement.

If a capacitor is connected across a source of AC voltage then

If the value of C in a series RLC circuit is decreased, the resonant frequency

Ina series RLC circuit that is operating above the resonant frequency, the current

What is the power factor for a series LCR circuit at resonance?

In A.C generator increasing the no. of turns in the coil

In alternative current generator in India, AC current reverses its direction

The direction of induced Emf or current is indicated by

An iron core transformer with a turns ratio of 8 : 1 has 120 V applied across the primary. The voltage across the secondary is

Transformer works on the principle of:

Which of the following effects is not shown in alternating current ?

The core of a transformer is laminated, so as to

Ina transformer, the no. of turns of primary and secondary coil are 500 and 400respectively. If 220 V is supplied to the primary coil, then ratio of currents in primary and secondary coils is

In an LC oscillator, the frequency of oscillator is ……………. L or C.

EMF generated in an alternator depends on which of the following factors?

Which of the following quantity remains constant in an ideal transformer?

Transformer is used to 

The number of turns in primary coil of a transformer is 20 and the number of turns in a secondary is 10. If the voltage across the primary is 220V ac what is the voltage across the secondary?

In a transformer the number of primary turns is four times that of the secondary turns. Its primary is connected to an a.c. source of voltage V. Then

A transformer is used to light 100 W-110 V lamp from 220 V mains. If the mains current is 0.5 A, the efficiency of the transformer is

What is the unit of capacitive reactance?

The capacitive reactance of a 5 µF capacitor for a frequency of 106 Hz is

Ina capacitive circuit, resistance to the flow of current is offered by

Ina capacitive circuit, by what value of phase angle does alternating currentleads the e.m.f.?

A100 Hz a.c. is flowing in a 14 mH coil. The reactance of the coil is

Ina pure inductive circuit, resistance to the flow of current is offered by

In a inductive circuit, by what value of phase angle does alternating current legs behind e.m.f.?

How much inductance should be connected to 200 V, 50 Hz a.c. supply so that a maximum current of 0.9 A flows through it?

The maximum value of current when inductance of 2 H is connected to 150 volt, 50 Hz supply is

Assertion(A): - A capacitor of suitable capacitance can be used in a circuit in place of the choke coil.

Reason(R): - A capacitor blocks DC and allow AC only.