Noise MCQ’s

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This set of Linear Integrated Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Noise”.

1. Identify the external noise sources
a) Switching of rotating machinery
b) Control circuits
c) Ignition system
d) All of the mentioned

2. Which among the following is not a source of internal noise?
a) AC random voltages generated within conductors
b) Lightning
c) Switching of circuits
d) None of the mentioned

3. The major source of interference with the desired signal in electronic system is called
a) Error signal
b) Interference signal
c) Noise signal
d) Faulty signal

4. The type of noise phenomena that increases with increase in temperature is
a) None of the mentioned
b) 1/f noise
c) Schottky noise
d) Thermal noise

5. Which type of noise is produced when the op-amp has wider bandwidth?
a) 1/f noise
b) Schottky noise
c) Thermal noise
d) Radiant noise

6. The factors that determine the amount of noise induced is
a) Type of coupling between two circuits
b) Rate of change of current per unit time
c) Speed of operation of circuit
d) All of the mentioned

7. Mention a scheme to reduce the effect of electrical noise on ICs?
a) Isolating ICs on different boards
b) Add a filter near ICs
c) Physical shielding of ICs
d) Use of compensating networks near ICs

8. How to choose an IC for a high electrical noise environment?
a) Low degree of noise immunity
b) High degree of noise immunity
c) Low degree of noise reduction
d) High degree of noise reduction

9. Internal noise generation can be reduced by keeping
a) None of the mentioned
b) Input lead length short
c) Both input and output lead length short
d) Output lead length short

10. Find the output voltage for differential amplifier, Where Vin->Induced input noise.

Find the output voltage when input of the differential amplifier has induced noise voltage

a) VO= -[(RF/R1)×Vd]+Vno
b) VO= -(RF/R1)×(Vd/Vno)
c) VO= -[(RF/R1)×Vd]-Vno
d) VO= -[(RF/R1)×Vd]×Vno

11. Which among the following has best immunity to induced noise?
a) Non-inverting amplifier
b) Inverting amplifier
c) Differential amplifier
d) Voltage follower

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