Analog Electronics Test 2 - Online Electronics and Communication Engineering Test

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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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Marks : 2/20

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Test Review : View answers and explanation for this test.

An exponential amplifier has diode in feedback path.

True

False

[#]

A 12 kHz pulse wave-form is amplified by a circuit having an Upper cut-off frequency of 1 MHz. The minimum input pulse width that can be accurately reproduced is

83.33 μ sec

1 μ sec

0.1 m sec

3.5 m sec

[#]

A transistor with a = 0.9 and I_CBO = 10 μA is biased so that I_BQ = 90 μA. Then I_CQ will be

910 mA

5 mA

5.25 mA

4.95 mA

[#]

It is desired to reduce distortion in an amplifier from 8% to 2% by using 5% negative feedback. The open and closed loop gains respectively are

60 and 15

15 and 60

6 and 1.5

1.5 and 6

[#]

A bridge rectifier circuit has a dc load current of 10 mA and a filter capacitance of 1000 μF. The peak to peak ripple voltage is

0.01 V

0.05 V

0.1 V

0.5 V

[#]

For an ideal noise free transistor amplifier the noise factor is

zero

zero dB

1 dB

depends on other factors

[#]

An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. What percentage of feedback will cause oscillations?

0.1%

0.5%

[#]

Class A and Class B power amplifiers predominate at

audio frequencies

radio frequencies

all frequencies

audio and radio frequency

[#]

Which of the following is not valid in case of FETs?

It has low voltage gain

It has high input impedance

It has fast switching time

It is voltage controlled device

[#]

10.

In a series regulated power supply circuit the voltage gain of pass transistor satisfies the condition

A_v → ∞

1 << A_v → ∞

A_v ≈ 1

A_v << 1

[#]

11.

Which of the following configuration has low thermal stability?

All have identical thermal stability

[#]

12.

Occasionally a discrete amplifier user RF chokes instead of collector resistors. Such amplifiers are inherently

low pass amplifiers

high pass amplifiers

band pass amplifiers

none of the above

[#]

13.

Examine the circuit of figure and the following statements

V_s is more than the zener breakdown voltage.
I_L = I₁ - I₂.
R_s is less than zener nominal resistance.

Which of the above statements are correct?

1, 2, 3

1, 2

1 only

2 and 3

[#]

14.

A capacitor input filter relies on

average detection

peak detection

both (a) and (b)

neither (a) nor (b)

[#]

15.

Two identical FETs each having parameters g_m and r_d are connected is parallel. The composite FET has parameters

0.5 g_m and 2 r_d

0.5 g_m and 0.5 r_d

2 g_m and 2 r_d

2 g_m and 0.5 r_d

[#]

16.

The main drawback in the performance of shunt peaked wide band amplifier is

two low gain at low frequency

poor phase response

reduce frequency at middle frequency

that the maximum gain of the stage is small

[#]

17.

Which amplifier has the higher power gain?

Common emitter

Common collector

Common base

Both CC and CE

[#]

18.

Which class of amplifiers operates with least distortion?

Class A

Class B

Class C

Class AB

[#]

19.

For the circuit of figure the input and output Miller resistances are

5 kΩ each

1 ohm and 5 kΩ respectively

5 kΩ and 1 ohm respectively

1 ohm each

[#]

20.

Which of the following statements is false?

Push pull signals are equal and opposite in phase

Class AB operation cannot be used for a push pull audio power output phase

A push pull output transformer has a centre-tapped primary

All of the above

[#]

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Online Electronics and Communication Engineering Test - Analog Electronics Test 2

Marks : 2/20

Test Review : View answers and explanation for this test.

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