Online Electronics and Communication Engineering Test - Analog Electronics Test 1

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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The quiescent collector current I_C, and collector to emitter voltage V_CE in a CE connection are the values when

ac signal is zero

ac signal is low

ac signal is negative

either (a) or (b)

[#]

A transistor has two p-n junctions. The batteries should be connected such that

both junctions are forward biased

both junctions are reverse biased

one junction is forward biased and the other is reverse biased

either (a) or (b)

[#]

In a BJT amplifier the power gain from base to collector is 4000. The power gain in dB is

3.6

7.2

[#]

Assertion (A): In an op-amp the voltage gain and band width can be adjusted as per requirement

Reason (R): Large value capacitor can also be fabricated on a chip

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

[#]

In the diode circuit shown in figure the diodes are ideal. The impedance seen by source is

1 k ohm

2 k ohm

0.5 k ohm

infinite

[#]

Typical values of current gains for CE, CB and CC amplifiers are

120, 120 and 1 respectively

120, 1 and 120 respectively

1, 120 and 120 respectively

1, 1 and 120 respectively

[#]

Transformer coupling is mostly used in

RF amplifier

audio amplifier

both audio and RF amplifier

none of the above

[#]

The properties of FETs closely resemble those of a

thermionic valve

P-N-P transistor

N-P-N transistor

UJT

[#]

Which of the following statement about JFET is correct?

In an N-channel JFET, the channel is the narrowest under zero gate bias condition

In a JFET the gates are always forward biased

In a JFET, gate-source cut off voltage is numerically equal to the pinch off voltage

It is a voltage controlled device

[#]

10.

Symbol shown in figure represents a

P-channel enhancement MOSFET

N-channel DEMOSFET

UJT with P-type base

UJT with N-type base

[#]

11.

Primary advantage of a crystal oscillator is that

it can oscillate at any frequency

it gives a high O/P voltage

its frequency of oscillation remains almost constant

it operates on a very low dc supply voltage

[#]

12.

The source of the harmonic distortion in a RC coupled transistor amplifier is usually

power supply

capacitor

R-C circuit

transistor

[#]

13.

Which of the following uses a capacitor in the feedback path?

Active low pass filter

Active high pass filter

Both (a) or (b)

Neither (a) nor (b)

[#]

14.

Which of the following compensation method in amplifier can be used to reduce the bandwidth?

Pole-zero compensation

Dominant pole compensation

Lead compensation

Any of the above

[#]

15.

A Colpitt's oscillator uses

a tapped inductor

an inductor and two capacitors

both (a) and (b)

either (a) or (b)

[#]

16.

In figure, the function of resistor R is

to reduce ripples in the output

to improve voltage regulation

to limit the surge current

either (a) or (c)

[#]

17.

The gain of a source follower is unity.

True

False

[#]

18.

When the ac input signal is very large the instantaneous operating point CE amplifier moves all the way between

ac saturation and ac cut off points

ac operating and ac cut off points

ac saturation and ac operating points

none of the above

[#]

19.

Which circuit has its output signal from, the emitter?

Common base

Common emitter

Emitter follower

None of the above

[#]

20.

The horizontal intercept of dc load line is the same as ideal

cut off point

saturation point

operating point

quasi saturation point

[#]

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Online Electronics and Communication Engineering Test - Analog Electronics Test 1

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