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Lutron Electronics

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MySoho Interview Questions and Answers

Updated 18 Dec 2024

Q1. What is Circuit breaker and give real life example

Ans.

A circuit breaker is an electrical switch designed to protect an electrical circuit from damage caused by excess current.

  • Circuit breakers automatically interrupt the flow of electricity when a fault is detected.

  • They are commonly used in homes to protect electrical circuits from overloads or short circuits.

  • A real life example of a circuit breaker is the one found in a circuit panel in a house, which trips when too much current flows through the circuit.

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Q2. Explain Ohms law, basic current voltage

Ans.

Ohm's law states that the current flowing through a conductor is directly proportional to the voltage applied across it, with resistance as a constant factor.

  • Ohm's law is expressed as V = IR, where V is voltage, I is current, and R is resistance.

  • It can also be written as I = V/R or R = V/I.

  • For example, if a circuit has a voltage of 12V and a resistance of 4 ohms, the current flowing through it would be 3A (12V/4ohms = 3A).

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Q3. What is ohm's law

Ans.

Ohm's law states that the current flowing through a conductor is directly proportional to the voltage across it, given a constant resistance.

  • Ohm's law is represented by the formula V = IR, where V is voltage, I is current, and R is resistance.

  • It is named after German physicist Georg Simon Ohm.

  • It is commonly used in electrical engineering to calculate current, voltage, or resistance in a circuit.

  • For example, if a circuit has a voltage of 12 volts and a resistance of 4 ohms, th...read more

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Q4. What does a stress-strain diagram look like?

Ans.

A stress-strain diagram shows the relationship between stress (force applied) and strain (resulting deformation) in a material.

  • The diagram typically starts with a linear elastic region where stress is directly proportional to strain.

  • After the elastic limit, the material enters the plastic region where it deforms permanently.

  • Finally, the material reaches its ultimate strength before failure occurs.

  • Examples of stress-strain diagrams include brittle materials like ceramics havin...read more

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Q5. Different ways to generate PWM from a proc

Ans.

Different ways to generate PWM from a processor

  • Using hardware timers

  • Using software timers

  • Using dedicated PWM modules

  • Using pulse-width modulation libraries

  • Using direct register manipulation

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Q6. Timers in different microprocessors

Ans.

Timers in microprocessors vary in features and implementation.

  • Timers can be used for various purposes such as generating interrupts, measuring time intervals, and controlling PWM signals.

  • Different microprocessors may have different types of timers such as basic timers, general-purpose timers, and advanced timers.

  • The number of timers, their resolution, and clock source can also vary between microprocessors.

  • Examples of microprocessors with different timer features include STM32...read more

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Q7. 3 Lamps in a room puzzle

Ans.

Three lamps puzzle: Determine which switch controls each lamp, with only one chance to enter the room.

  • Turn on the first switch and wait for a few minutes.

  • Turn off the first switch and turn on the second switch.

  • Enter the room and observe the lamps.

  • The lamp that is on corresponds to the second switch.

  • The lamp that is off and warm corresponds to the first switch.

  • The lamp that is off and cool corresponds to the third switch.

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