Question # 1

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

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zero

small

large

very large

OP-AMP has the following input terminals

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one

two

three

four

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

A P-N juction or semiconductor diode cannot be used as

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A rectifier

Detector

Oscillator

An amplifier

The wave form of alternating voltage is the graph between:

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Voltage across X-axis and time across y-axis

Current and time

Voltage along y-axis and time along x-axis

Voltage and current

Either (B) or (D)

Peak value of alternative current is:

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one of its Instantaneous value

Equal to its RMS value

The same as its peak-to-peak value

Both (B) and (C)

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

Transmitting antenna emits

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Magnetic waves

Electric waves

Electromagnetic waves

Sound waves

Alternating current is produced by a voltage source which polarity:

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Remains the same

Reverse after period T

Keeps on reversing with time

Reverse after every time interval T/2

Both (C) and (D)

A digital system deals with quantities or variables which have

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only one state

only two discrete states

three discrete states

four discrete states

If 250V is the RMS value of alternative voltage, then its peak value V_owill be:

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353.5V

250V

175V

zero

400V

In a transistor, if the central region is p-type then this type of transistor is known as

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p-n-p transistor

n-p-n transistor

either of these

none of these

Most OP-AMP operates with

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+ 6 V supply

+ 10 V supply

+ 12 V supply

+ 24 V supply

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

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0°

90°

180°

270°

Average value of A.C voltage during one cycle is

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1

Zero

Maximum

Variable

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

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photo diode

light emitting diode

photo voltaic cell

none of these

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Physics ECAT Pre Engineering Chapter 16 Alternating Current Online Test MCQs With Answers

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