## Circuit Design Interview Questions & Answers

• Question 1. The Numerical Values Of What Circuit Elements Are Typically Represented Using Colored Stripes?

Answer :

The numerical values of resistors circuit elements are typically represented using colored stripes.

• Question 2. Which Of These Statements Expresses De Morgan’s Theorem?

Answer :

NOT (A AND B) = (NOT A) OR (NOT B)

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• Question 3. In A Low-pass Filter Consisting Of A Resistor And A Capacitor, How Will The Cut-off Frequency Change If The Capacitance Is Increased?

Answer :

The cut-off frequency is lower for larger capacitances.

• Question 4. In A High-pass Filter Consisting Of A Resistor And A Capacitor, How Will The Cut-off Frequency Change If The Capacitance Is Increased?

Answer :

The cut-off frequency is lower for larger capacitances.

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• Question 5. A High-voltage Primary Circuit Is Isolated With The Use Of An Optocoupler On A Secondary Circuit. Does The Addition Of The Optocoupler Add Inductance To Either Circuit?

Answer :

no, the optocoupler does not add inductance.

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• Question 6. Consider A Switch On A High-voltage Circuit That Is Unsafe To Operate Manually. How Might The Switch Be Safely Actuated?

Answer :

by using a secondary, low-voltage relay circuit.

• Question 7. To What Does The “sample Rate” Of A Signal Refer?

Answer :

how often in time the signal is sampled.

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• Question 8. Which Model Is Generally Used For Transmission Lines?

Answer :

distributed element model is generally used for transmission lines.

• Question 9. How To Use Breadboard?

Answer :

Breadboard used as a construction base for prototyping of a circuit.

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• Question 10. How Does The Breakdown Voltage Of A Dielectric Depend Upon Its Thickness?

Answer :

a thick layer of dielectric has a higher breakdown voltage than a thinner layer of the same dielectric.

• Question 11. If In A Circuit The Input Voltage (vin) Is Applied Across The Series Impedances Z1 And Z2 And The Output Is Taken Across Z2, What Is The Output Voltage (vout) Given By?

Answer :

[Z2 / (Z1 + Z2)] . Vin

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• Question 12. A String Of Decorative Holiday Lights Are Lit Except For Two Burnt-out Bulbs. Are The Bulbs Of The String Wired In Parallel Or Series With Each Other?

Answer :

The lights must be wired in parallel with each other.

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• Question 13. How Many Diodes Are Required To Build The Bridge In A Full-wave Rectifier That Does Not Employ A Transformer?

Answer :

four diodes are required to build the bridge in a full-wave rectifier that does not employ a transformer.

• Question 14. According To Kirchhoff’s Voltage Law, The Sum Of The Emfs In Any Closed Loop Is Equal To?

Answer :

The sum of the potential drops in that loop.

• Question 15. What Are The Names Of The Three Terminals On A Bjt Transistor?

Answer :

1. base
2. collector
3. emitter
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• Question 16. Which Is A Primary Disadvantage Of A Solid-state Amplifier Compared With A Vacuum-tube Amplifier?

Answer :

poor tolerance for high -current and -voltage transients.

• Question 17. How Is The Nyquist Rate For A Signal Related To The Bandwidth Of The Signal?

Answer :

a wider bandwidth requires a higher Nyquist rate.

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• Question 18. What Is The Approximate Impedance Of A Universal Serial Bus (usb) Computer Connection?

Answer :

50 Ohm

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• Question 19. What Is The Function Of A Diode Clamp?

Answer :

to maintain the voltage of a signal between fixed bounds.

• Question 20. To What Do The “rails” Of An Operational Amplifier Refer?

Answer :

the potentials of the positive and negative terminals of the power supply.

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• Question 21. In A Differentiator Circuit, The Output Is Approximately?

Answer :

directly proportional to the rate of change of input.

• Question 22. One 50-ohm Resistor And Two Parallel 100-ohm Resistors Have The Same Impedance. In Which System Do The Resistors Have Lower Current When Dissipating 1 Kw?

Answer :

the system with two 100-Ohm resistors.

• Question 23. On A Printed Circuit Board That Supports Several Different Inductors In Different Circuits, Are There Any Constraints To The Layout Of The Inductors?

Answer :

Yes, the inductors must be oriented at right angles in order to avoid coupling.

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• Question 24. On A Printed Circuit Board, What Is A Flux Capacitor?

Answer :

An exploitation of the capacitance that is due to the lateral electric flux between two adjacent printed conductors.

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• Question 25. What Is The Characteristic Feature Of Heterodyne Processing Compared With Homodyne Processing?

Answer :

only heterodyne processing employs frequency conversion.

• Question 26. The Self-induced Back Voltage In A Circuit That Occurs When An Inductive Dc Circuit Is Opened May Be Safely Routed Away From The Switch With A Diode Connected Across The Inductor And Against The Dc Voltage. What Is The Main Disadvantage Of This Practice?

Answer :

the decay of the current in the inductor is relatively slow.

• Question 27. Why Does An “l Pad” Impedance-matching Network Bear That Name?

Answer :

Because the two resistors in the network are traditionally oriented in the shape of the capital letter “L” on schematic drawings.

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• Question 28. In A High-pass Filter Consisting Of A Resistor And An Inductor, How Will The Cut-off Frequency Change If The Inductance Is Increased?

Answer :

The cut-off frequency is lower for larger inductances.

• Question 29. Dithering Of An Audiofrequency Signal Typically Occurs At What Stage?

Answer :

following digital-to-analog conversion and prior to playback.

• Question 30. Which Of The Following Statements Can Be Made Concerning A Xnor (b Xnor C) = (a Xnor B) Xnor C ?

Answer :

this is true because XNOR is associative.