Question # 1

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 A.C circuit of inductor which one is true

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Voltage leads current by phase angle π/2

Voltage lags current by π/2

Current leads voltage by π/2

Both remain in phase

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

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

In pure capacitor A.C. circuit, the current I and charge q are.

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In phase

Out of phase

Parallel to each other

None of above

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

High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

Vrms =

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0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

The AC system is preferred to DC system because:

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AC voltage can be easily changed in magnitude

DC motor angular velocity is affected badly

High voltage AC transmission is less efficient

Domestic appliance require AC voltage for their operation

In RLC circuit the energy is dissipated in

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R only

R and L

R and C

L and C

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.

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90^o

270^o

0^o

180^o

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

The A.M. transmission frequencies range from

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540 KHz to 1000 KHz

540 Khz to 1600 KHz

520 KHz TO 1600 KHz

520 KHz TO 1400 KHz

The natural frequency of L.C circuit is equal to

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In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

In purely resistive A.C circuit, instantaneous value of voltage and current:

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Current lags behind voltage

Current leads voltage by π/2

Both are in Phase

Voltage leads current by Pase θ=π/2

If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.

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Half

Two

Four times

One fourth

The reactance of inductor depends upon

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L

All of the above

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