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Senior hardware engineer Interview Questions


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If you have a 10W light bulb and a 100W light bulb, and you connect them together, which one will be brighter?

9 Answers

If you connect them in parallel, obviously the 100W bulb will be brighter. But if you connect them in series, the 10W bulb will almost certainly be brighter because it limits the current going to the 100W bulb to a fraction of its normal operating current. This assumes by "brightness" you really mean total radiated power in visible + IR wavelengths, and that both bulbs have "brightness" linear with power.

I do not agree with answer for "in-series". Must have been the next to last question you had on the last day. What incadescent bulb will current limit? Assuming incandescent bulbs, the bulbs would act as a voltage divider and the 100W bulb would still give off more light (lumens in the visible spectrum) than the 10W bullb. Use an analysis whereby use a smaller resistor for 100W and a 10x higher resistance for 10W bulb. Each bulb will be alittle dimmer than in parallel, but 100W still brighter. Fluorescent bulbs would be a whole new story. Would they even work at lower voltages?

@Don you are correct up until your conclusion that "Each bulb will be a little dimmer than in parallel, but 100W still brighter." The 100W bulb is 10x dimmer if you assume resistance does not depend on current. Reality is even worse since R increases with current. Since the 10W bulb has 10x higher resistance than 100W bulb, it will absorb 10x as much power in the voltage divider: 100W bulb = 1A at 100V, or 100 ohms 10W bulb = 0.1A at 100V, or 1000 ohms 100W bulb + 10W bulb in series driven off 110V line is 1100 ohms carrying 0.1A of current. Power delivered to 10W bulb is P = I^2 x R = (0.1A)^2 x (1000 ohm) = 10W. Power delivered to 100W bulb is P = (0.1A)^2 x (100 ohm) = 1W. So the 100W bulb only receives 1W delivered power because the 10W bulb absorbs all the power in the divider. The 10W bulb will be brighter.

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Describe a function to check if an integer is a power of 2.

6 Answers

Describe a circuit that implements the following truth table using only NAND gates. A B OUT 0 0 1 0 1 1 1 0 0 1 1 1

7 Answers

There are 5 bowls with 100 candies each. In 4 bowls, all of the candies are 10 grams each. In 1 bowl, all the candies are 9 grams each. Using a digital scale, how can you determine which bowl has the 9 gram candies by using only 1 weighing?

2 Answers

What is a time domain test instrument and what is a frequency domain instrument? I've never heard of these terma before.

2 Answers

Non-trivial sender-receiver type of coding problem.

2 Answers

How many ping pong balls fit in a 747

2 Answers

Not the most difficult question but I found this question interesting. Write a piece of code that allows you to detect if the machine you are running the program is little Endian or big Endian memory structure.

2 Answers

Do you have firmware development experience.

1 Answer

Parallel Computer architecture, -Gave the MP structure and then asked How would you maintain coherency

1 Answer
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