Question # 1

The highest value reached by the voltage or current in one cycle is called.

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Peak ot peak value

Peak value

Instantaneous value

Root mean square value

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

The most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

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

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Resistor

Inductor

Capisitor

Transistor

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

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Resistor only

Capacitor only

Inductor only

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 wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

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 metal detector, we use.

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L-C circuit

R-L circuit

R-C circuit

RLC series circuit

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

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Changing

Constant

Infinite

zero

The circuit which compares the two voltages is.

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LDR

Sensor

Comparator

Logic gate

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

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An alternating quantity (voltage or current) is completely known if we know its:

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Maximum

Frequency and phase

Effective value

Both (a) & (b)

Power dissipated in a pure inductor is.

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Large

Small

Infinite

Zero

The phase difference between current and voltage in an inductive circuit is.

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zero

90 ^o

180 ^o

45^o

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