Resistor & Resistivity Viva Interview Questions Answers

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Question-1. What is a resistor?

Answer-1: A resistor is an electrical component that opposes the flow of electric current in a circuit.

Question-2. What is resistivity?

Answer-2: Resistivity is a measure of a material's ability to resist the flow of electric current.

Question-3. How is resistivity different from resistance?

Answer-3: Resistance depends on both the material and the dimensions of the resistor, while resistivity is an intrinsic property of the material.

Question-4. What is the unit of resistivity?

Answer-4: The unit of resistivity is ohm-meter (Ω?m).

Question-5. What factors affect the resistivity of a material?

Answer-5: Temperature, impurities, and the material's atomic structure affect resistivity.

Question-6. What is the formula for calculating resistance using resistivity?

Answer-6: The formula is : R = Aρ?L?, where R is resistance, ρ is resistivity, L is length, and A is cross-sectional area.

Question-7. What is the color code for resistors?

Answer-7: The color code is a system of colored bands used to indicate the resistance value of a resistor.

Question-8. How can you calculate the resistance of a resistor using its color bands?

Answer-8: By using a color code chart which assigns numeric values to colors representing digits, multipliers, and tolerance.

Question-9. What does the tolerance of a resistor indicate?

Answer-9: Tolerance indicates the maximum deviation from the specified resistance value.

Question-10. What is a variable resistor?

Answer-10: A variable resistor, also known as a potentiometer or rheostat, is a resistor whose resistance can be adjusted manually.

Question-11. How does temperature affect resistance?

Answer-11: In general, resistance increases with temperature for most conductors.

Question-12. What is the temperature coefficient of resistance?

Answer-12: The temperature coefficient of resistance (TCR) is a measure of how much the resistance of a material changes with temperature.

Question-13. What is the difference between a fixed resistor and a variable resistor?

Answer-13: A fixed resistor has a constant resistance value, while a variable resistor allows the resistance to be adjusted.

Question-14. What are the applications of resistors in electronic circuits?

Answer-14: Resistors are used for current limiting, voltage division, signal conditioning, and biasing in electronic circuits.

Question-15. What is the function of a pull-up resistor?

Answer-15: A pull-up resistor ensures that an input is at a defined logic level when no external signal is present.

Question-16. What is the difference between a series resistor and a parallel resistor?

Answer-16: In a series circuit, resistors are connected end-to-end, increasing total resistance. In a parallel circuit, resistors are connected across each other, decreasing total resistance.

Question-17. What is a resistor network?

Answer-17: A resistor network is a combination of multiple resistors in a single package, often used in integrated circuits.

Question-18. What is the power rating of a resistor?

Answer-18: The power rating of a resistor indicates the maximum amount of power it can dissipate without damage.

Question-19. What is a shunt resistor?

Answer-19: A shunt resistor is a low-value resistor connected in parallel with a component to measure current by voltage drop across it.

Question-20. How do you calculate the power dissipation in a resistor?

Answer-20: The formula is : P = I^{2} . R or P = V^{2} / R, where P is power, I is current, R is resistance and V is voltage.

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