Question # 1

Electron vibrating 94,000 times each second will produce radio waves of frequency.

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94 Hz

940 HZ

94 Hz

490 Hz

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 modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

The value of capacitive reactance is given by

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Xc = VI

All of above

In metal detector, we use.

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L-C circuit

R-L circuit

R-C circuit

RLC series circuit

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

In Pakistan the frequency of A.C. supply is.

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50 Hz

60 Hz

45 Hz

70 Hz

Xc =

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1/2πfc

2πfc

2π/fc

fc/2π

The circuit in which current and voltage are in phase, the power factor is:

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Zero

1

-1

2

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

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Resistor only

Capacitor only

Inductor only

All of these

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

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10⁶

0

10^∘

Maximum

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

In RLC circuit the energy is dissipated in

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R only

R and L

R and C

L and C

The combined effect of resistance and reactance in circuit is called:

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Impedance

Inductance

Capacitance

None of above

The sum of positive and negative peak value called.

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R.M.S. value

P-P value

Peak value

Average value

Which consumes small power.

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Inductor

Resistor

Motor

All of these

The effective value of any sinusoidal alternating current or voltage is

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None of the above

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