Question # 1

At resonance frequency, the impedance of RLC series circuit is.

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Maximum

Minimum

Zero

Infinite

When 10 V are applied to an A.C circuit, the current flowing in it is 100 mA. It impedance is.

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100 Ohm

10 Ohm

1000 Ohm

1 Ohm

The reactance is the ratio of

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V_rms/I_rms

V_rms x I_rms

I_rms/V_rms

V_max x V_rms

The phase angle of a series RLC circult at resonant frequency is

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1/2

sigma

Zero

sigma /4

In case of capacitor, the unit of reactance is

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Farad

Ohm

Newton

All of these

The main use of A.C is

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Minimum line losses

Long distance transmission

Stepping up to required voltage only

Steeping down to required voltage only

In chopke coil the resistance X_L an resistance R are:

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X_L=R

X_L<<R

X_L>>R

X_L=∞

The slope of q-t curve at any instant of time gives.

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Voltage

Current

Charge

Botha a and b

The highest value reached by the voltage or current is one cycle is called:

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Peak to peak value

Peak value

Instantaneous value

Root mean square value

Main reason for world wide use of A.C. is

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It is cheaper

Transmitted

Botha a and b

Reaches in short time

The device which allows only the continuous flow of AC through it is.

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Inductor

Battery

Thermistor

Capacitor

The effective value of any sinusoidal alternating current or voltage is

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None of the above

In case of A.C. through resistor V and I are

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At 0^o with each other

At 180 ^o with each other

At 90^o with each other

At 270 ^o with each other

The highest value reached by the voltage or current in one cycle is called.

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Peak ot peak value

Peak value

Instantaneous value

Root mean square value

Which consumes small power.

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Inductor

Resistor

Motor

All of these

In three phase A.C. generator the phase difference between each pair of coil is.

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45^o

90^o

120^o

60^o

The mean value of A.C. in a cycle is.

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1

0

I2

Nil

An alternating voltage is given by 20 sin 157 t. Th efrequency of alternating voltage is:

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50 Hz

25Hz

100 Hz

75 Hz

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