Question # 1

During the negative half-cycle of the half-wave rectification, the diode

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does not conduct

conducts

either of these

none of these

At higher frequency of the alternating current, the capacitive reactance X_c

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Increases

Decreases

Remains the same

Increases only when the voltage increases

Which of the following diode is used for the detection of light

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photo diode

light emitting diode

photo voltaic cell

all of them

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

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9.4 kHz

940 kHz

94 kHz

None of these

Average value of A.C voltage during one cycle is

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1

Zero

Maximum

Variable

The bridge circuit of full wave rectification uses

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one diode

two diode

three diode

four diode

When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the

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base and emitter

collector and emitter

base and collector

any one of these

The R₁= infinity and R₂= 0, then the gain of non-inverting amplifier is

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zero

infinity

one

any one of these

When the pn-junction is forward biased. the current flows through it is of the order of

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mili-amperes

amperes

nano-amperes

micro-amperes

At resonance, the phase angle for RLC series resonance circuit equals

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0°

90°

180°

270°

The total reactance of a series RLC circuit at resonance is

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zero

Equal to the resistance

Infinity

Capacitive

The waveform of alternating voltage is a:

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Square

Rectangular

Saw-tooth

Sinusoidal

None of these

In a normally biased n-p-n transistor, an electron c current I_Eflows from the

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emitter into the base

collector into the base

base into collector

none of these

The basic circuit elements of A.C circuit are

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Resistor

Inductor

Capacitor

All the three

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

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transformer

rectifier

filter

none of these

In frequency modulation (FM), the carrier waves amplitude

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Remains constant

Increase

Decreases

None of these

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ECAT Physics Chapter 16 Alternating Current Online Test MCQs With Answers

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