Preguntas de entrevista de Design engineer

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Preguntas de entrevista para Design Engineer compartidas por los candidatos

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PARI
A un Mechanical Design Engineer le preguntaron...5 de noviembre de 2013

need to join tomorrow are you ready?

13 respuestas

yes

Yes sir

Yes I am ready to join

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Amazon

Given a string find the first non-repeated character.

12 respuestas

@Rajiv : Your solution is completely wrong. It will fail for input of "aaa" Reason: on first check, you insert "a". On next check you remove it. On next check you again insert it and return that as your answer, even though it was repeated thrice. Menos

program to find first non repeating character in a string c# - three ways

My python implementation: def firstNonRepeatingCharacter(inputString): hashmap = {} for x in inputString: if (x in hashmap): hashmap[x] = hashmap[x] + 1 else: hashmap[x] = 1 for x in inputString: if (hashmap[x] > 1): continue else: return x return "No nonrepeating character found" Menos

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Dolphin Technology

Basic MOSFET, CMOS questions were asked.

11 respuestas

Hey, you should feel glad that you weren't accepted by them. This company is very cheap and doesn't treat its employees well. Menos

I guess...but it is not the right way to interview candidates don't you think?

That's really sad. They should rather go with Skype or any other means to interview. Now,. I have got an on-site call for Digital circuit design and I am giving it a serious thought 🤔 Menos

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Apple

There is a refrigerator in a perfectly insulated room. The door is then opened. Is it an open or closed system? After a long time has passed, has the temperature in the room increased or decreased?

8 respuestas

It is a closed system as electricity is adding energy into the room. After a long time passes, the temperature increases as there's energy going in, but not leaving. Menos

It's a closed system. Since the efficiency of heat transfer is not 100%, will generate heat and eventually heat up the room. Menos

Since there is energy going into the room, it is open system without mass transfer. The room temperature will increase. Menos

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SerialTek

Create a 8 input AND gate using 3 4:1 muxes

8 respuestas

Without an enable bit on at least one of the mux's the maximum inputs would be 7. Menos

I don't see it being possible with three standard 4-1 muxes... Using 4, this question is straight forward... The two selects of each mux are your 8 inputs... tie out put of each mux to the (11) case input to the mux. Menos

We need 3 4:1 MUX and a And gate. Are we allowed to use 'and' gate?

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Apple

Show me the back of an iPhone and asked me how it might have been manufactured.

8 respuestas

Automated CNC milling

A cast polymere

Still don’t get it

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NVIDIA

design a full adder with 2-1 mux

6 respuestas

full adder can be got by 2 half adders and one OR gate; one half adder can be got by XOR, AND. Therefore, we need only OR, AND, XOR. All these three gates can be got by using MUX.? Menos

Can be implemented using 8 Muxes.

sum = a xor b xor cin carry = (a xor b) cin + ab You can easiy make XOR, OR AND, NOT using 2:1 mux. So 8 mux ?!? Menos

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Apple

If I have a solid rod and hollow rod with the same mass and I let them slide in a ramp. Which one reaches the bottom first and why?

6 respuestas

Since they've clearly told sliding. Acceleration along the ramp is independent of the mass or the moment of Inertia. Hence, both reaches down at the same time. Menos

Solid bar, smaller moment of inertia allows it to spin faster

Solid reaches first

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Intel Corporation

CMOS Inverter , how to reduce the drive strength of Minimum size inverter

6 respuestas

"more the Ids, the lesser the drive strength is" This is exactly opposite of the actual fact...! Menos

Use body effect, reverse biasing, this will reduce the drain current. another way can be change the gate input, according to the I-V characteristic Menos

the first answer is definitely wrong, to decrease the driving capacity, please size down the ratio! Menos

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Apple

You have 5kg of Aluminum and 5kg of Steel. You can make whatever cross section beam you want with these materials. If you have to make a cantilever beam 1m long with a load at the end. And you want to minimize the deflection. What material would you use?

6 respuestas

Aluminum. While the previous post on Sep 5th is correct in stating that P, L are the same, since you are given a mass of both metals, you need to find you allowable "volume" of material, which you can estimate using 2700kg/m3 for Al and 7800kg/m3 for steel. MoI is given by (1/12) b h^3 if you assume b (base) is the same for both materials, you'll find that h for aluminum is greater than h of steel, and since h is cubed, it actually makes a big difference. In my test case, E of steel ~3x greater (200 GPa vs 70 GPa), but the moment of inertia of the Aluminum was ~3.75x than steel, meaning that deflection of aluminum would be less than steel! Menos

Why is it being assumed that the base be the same for both materials. Since the question allows to choose whatever cross section we are allowed, can we not just assume that we'll come up with a MoI that's comparable? Or we simply switch the b and h values for both materials. Given these assumptions, one could argue that the deflection is a function of E and thus, higher in aluminum and lower in steel. Menos

Aluminum

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