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Efftronics Systems Embedded Firmware Engineer Interview Questions and Answers

Updated 15 Dec 2024

Q1. Design the components which are involved in the internal logic circuit of a 7-segment display based on the provided circuit ?

Ans.

Components involved in the internal logic circuit of a 7-segment display include decoder, driver, and individual LED segments.

  • Decoder: Converts input signals into the appropriate output signals for each segment.

  • Driver: Amplifies the output signals from the decoder to drive the LED segments.

  • Individual LED segments: Represent each of the seven segments in the display.

  • Example: BCD to 7-segment decoder, transistor driver circuit, LED segments.

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Q2. When 2 trains move in opposite directions , what point will they meet at different speeds? And related questions

Ans.

The trains will meet at a point that is determined by the relative speeds of the trains.

  • The point where the trains meet is determined by the sum of the distances traveled by each train.

  • The time taken for the trains to meet is determined by the relative speeds of the trains.

  • If Train A is traveling at 50 mph and Train B is traveling at 70 mph, they will meet at a point that is closer to Train B's starting point.

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Q3. design specifications for creating a vending machine using a microcontroller, incorporating the display of amounts with two 7-segment displays and including four to five additional operational conditions?

Ans.

Design a vending machine using a microcontroller with two 7-segment displays and additional operational conditions.

  • Use a microcontroller to control the vending machine's operations

  • Incorporate two 7-segment displays to show the amounts

  • Include four to five additional operational conditions such as low inventory alert, coin validation, product selection, etc.

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Q4. Write an assembly language program for reversing a byte for a hexadecimal value ? ex: A3 hexadecimal needs to converted to C5 when reversed .

Ans.

Assembly language program to reverse a byte for a hexadecimal value.

  • Load the hexadecimal value into a register

  • Extract the lower 4 bits and upper 4 bits of the byte

  • Swap the lower and upper 4 bits

  • Combine the swapped bits to get the reversed byte

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Q5. Write an assembly language program for displaying a square waves for the frequency of 1 Hz and 2 Hz with the 2 ports .

Ans.

Assembly language program to display square waves for 1 Hz and 2 Hz using 2 ports.

  • Use assembly language instructions to control the ports for outputting square waves.

  • Set up a loop to toggle the ports at the desired frequencies to generate the square waves.

  • Ensure proper timing and synchronization between the two square waves.

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Q6. What is life according to you ?

Ans.

Life is a journey filled with experiences, challenges, growth, and opportunities for self-discovery.

  • Life is a precious gift that should be cherished and lived to the fullest

  • It involves constant learning, adapting, and evolving as individuals

  • Life is about forming meaningful relationships and connections with others

  • It includes pursuing passions, setting goals, and overcoming obstacles

  • Life is a balance of joy and sorrow, success and failure, love and loss

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Q7. Does education help you to earn money ?

Ans.

Education can help individuals earn money by providing them with valuable skills, knowledge, and opportunities for career advancement.

  • Education can lead to higher paying job opportunities

  • Specialized education or training can result in higher salaries

  • Education can also lead to promotions and career advancement

  • Higher levels of education are often correlated with higher earning potential

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Q8. Convert hexadecimal to decimal ?

Ans.

Hexadecimal to decimal conversion involves multiplying each digit by 16 raised to the power of its position.

  • Start from the rightmost digit and multiply each digit by 16 raised to the power of its position (0-indexed).

  • Add the results of each multiplication to get the decimal equivalent.

  • For example, converting 0x1A to decimal: (1 * 16^1) + (10 * 16^0) = 26.

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Q9. Design a digital circuit to control the tail lights of a car according to some given specifications

Ans.

Design a digital circuit to control car tail lights based on specifications

  • Use microcontroller to receive input signals from car's sensors

  • Implement logic to determine when to turn on/off tail lights (e.g. based on brake pedal or light sensor)

  • Connect output of microcontroller to control the tail lights

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