Question # 1

Impedance is denoted by:

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A

Z

P

Q

An in cudutor may store energy in

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Its magnetic field

Its coil

Its electric field

A neighboring circuit

The circuit which compares the two voltages is.

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LDR

Sensor

Comparator

Logic gate

The natural frequency of L.C circuit is equal to

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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

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

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Voltage

Current

Charge

Botha a and b

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None 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

Resistance of choke is

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zero

Large

Very small

Infinite

In a pure inductive A.C. circuit the current.

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Lags behind voltage by 90 ^o

Leads the voltage by 90 ^o

In phase with voltage

Leads the voltage by 270 ^o

The condition of resonance is:

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XL = 1/2 Xc

X_L = X_c

X_c = 4_x2

None of above

The combined effect of resistance and reactance is knows as.

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Inductance

Conductance

Resistance

Impedance

If V_rms be the root mean square value of emf then its peak to peak value is given by

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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

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

The expression P = VI hold only when current and voltage are.

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In phase

Out of phase

At right angle to each other

At angle of 120 ^o

The velocity of an oscillating charge as it moves to and fro along a wire is.

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Changing

Constant

Infinite

zero

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