Question # 1

The internal resistance of a capacitor is called:

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Impedance

Resistance

Reactance

Conductance

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

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1

0

I2

Nil

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

The Basic circuit element in a D.C. circuits which controls the current and voltage is

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Resistor

Inductor

Capisitor

Transistor

The sum of positive and negative peak value called.

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R.M.S. value

P-P value

Peak value

Average value

In three phase voltage across any two lines is about.

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220 V

230 V

400 V

430 V

If I_o is the peak value of current, then its root mean square value is given by

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2 I_o

I_o

0.7 I_o

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

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

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A

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 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

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

The effective value of any sinusoidal alternating current or voltage is

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None of the above

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

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 value of capacitive reactance is given by

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Xc = VI

All of above

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

Which consumes small power.

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Inductor

Resistor

Motor

All of these

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

Resistance of choke is

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zero

Large

Very small

Infinite

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