# Online Electronics and Communication Engineering Test - Analog Electronics Test 1

Instruction:

• This is a FREE online test. DO NOT pay money to anyone to attend this test.
• Total number of questions : 20.
• Time alloted : 30 minutes.
• Each question carry 1 mark, no negative marks.
• DO NOT refresh the page.
• All the best :-).

1.

The quiescent collector current IC, and collector to emitter voltage VCE in a CE connection are the values when

A.
 ac signal is zero
B.
 ac signal is low
C.
 ac signal is negative
D.
 either (a) or (b)

Explanation:

Quiescent-operation means operation when ac signal is not applied.

2.

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

A.
 both junctions are forward biased
B.
 both junctions are reverse biased
C.
 one junction is forward biased and the other is reverse biased
D.
 either (a) or (b)

Explanation:

Emitter base junction is forward biased and base-collector junction is reverse biased.

3.

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

A.
 Both A and R are correct and R is correct explanation for A
B.
 Both A and R are correct but R is not correct explanation for A
C.
 A is correct R is wrong
D.
 A is wrong R is correct

Explanation:

Large value capacitor cannot be fabricated on a chip.

4.

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

A.
 3.6
B.
 36
C.
 7.2
D.
 72

Explanation:

Gain in dB = 10 log (4000).

5.

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

A.
 1 k ohm
B.
 2 k ohm
C.
 0.5 k ohm
D.
 infinite

Explanation:

Only one diode conducts at one time.

6.

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

A.
 120, 120 and 1 respectively
B.
 120, 1 and 120 respectively
C.
 1, 120 and 120 respectively
D.
 1, 1 and 120 respectively

7.

The properties of FETs closely resemble those of a

A.
 thermionic valve
B.
 P-N-P transistor
C.
 N-P-N transistor
D.
 UJT

8.

Transformer coupling is mostly used in

A.
 RF amplifier
B.
 audio amplifier
C.
 both audio and RF amplifier
D.
 none of the above

9.

Symbol shown in figure represents a

A.
 P-channel enhancement MOSFET
B.
 N-channel DEMOSFET
C.
 UJT with P-type base
D.
 UJT with N-type base

10.

Which of the following statement about JFET is correct?

A.
 In an N-channel JFET, the channel is the narrowest under zero gate bias condition
B.
 In a JFET the gates are always forward biased
C.
 In a JFET, gate-source cut off voltage is numerically equal to the pinch off voltage
D.
 It is a voltage controlled device

11.

Primary advantage of a crystal oscillator is that

A.
 it can oscillate at any frequency
B.
 it gives a high O/P voltage
C.
 its frequency of oscillation remains almost constant
D.
 it operates on a very low dc supply voltage

12.

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

A.
 power supply
B.
 capacitor
C.
 R-C circuit
D.
 transistor

13.

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

A.
 Active low pass filter
B.
 Active high pass filter
C.
 Both (a) or (b)
D.
 Neither (a) nor (b)

14.

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

A.
 Pole-zero compensation
B.
 Dominant pole compensation
C.
D.
 Any of the above

15.

In figure, the function of resistor R is

A.
 to reduce ripples in the output
B.
 to improve voltage regulation
C.
 to limit the surge current
D.
 either (a) or (c)

16.

A Colpitt's oscillator uses

A.
 a tapped inductor
B.
 an inductor and two capacitors
C.
 both (a) and (b)
D.
 either (a) or (b)

17.

The gain of a source follower is unity.

A.
 True
B.
 False

18.

Which circuit has its output signal from, the emitter?

A.
 Common base
B.
 Common emitter
C.
 Emitter follower
D.
 None of the above

19.

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

A.
 ac saturation and ac cut off points
B.
 ac operating and ac cut off points
C.
 ac saturation and ac operating points
D.
 none of the above

20.

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

A.
 cut off point
B.
 saturation point
C.
 operating point
D.
 quasi saturation point