Question # 1

An inductor of 1 henry inductance has a reactance 500 ohms, then the frequency required is approximately

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50 Hz

100 Hz

80 Hz

120 Hz

Power dissipation is a pure inductive or in a pure capacitance circuit is:

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10⁶

0

10^∘

Maximum

The electromagnetic spectrum contains

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Radio waves

X-rays

Microwaves

All of these

An A.C. voltmeter reads 220 V, its peak value will be

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225 V

240 V

311.12 V

300 V

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

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 basic circuit element in A.C. circuit which controls current.

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Resistor only

Capacitor only

Inductor only

All of these

The main reason for world wide use of A.C is because:

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It is very high power

It can be transmitted over long distance

It is cheaper to use

ALl of above

The circuit which compares the two voltages is.

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LDR

Sensor

Comparator

Logic gate

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

In case of capacitor, the unit of reactance is

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Farad

Ohm

Newton

All of these

At resonance, the behavior of R-L-C series circuit is.

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Resistive

Capacitive

Inductive

Modulative

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

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

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

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Maximum

Minimum

Zero

Infinite

In three phase A.C supply coils are inclined at an angle of.

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0^o

90^o

120^o

80^o

A resistance frequency the impedance of RLC parallel circuit is.

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Zero

Infinite

Maximum

Minimum

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 three phase voltage across any two lines is about.

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220 V

230 V

400 V

430 V

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

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

The device which allows only the flow of D.C. is.

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Capacitors

transformer

Inductor

Generator

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