Interviews – Potential Question.

We are currently going through a rash of interviews now, getting more people to hitch their wagon to the Synergy star, and come along for the ride.

We need to determine the quality of the applicants who want to work in our intense work environment, ambiance provided by Jabba. I really want to ask the question (to a chemical engineer):

So, how do you transform a 60Hz AC supply to a 50Hz AC supply?

I’m a chemical engineer by birth, but even I know the answer. What I DON’T want to hear is:

Well, the difference between the two is negative 10Hz, right? So, if you spin the user 10Hz in the negative direction, you get 50Hz lah.

If I get that type of answer, I’ll spin the applicant negative 10 Hz.

C’mon elect engineers, give me the answer in the comments. I’ll take even weirder answers.

30 Responses to Interviews – Potential Question.

  1. mohd nazri says:

    use frequency converter (frequency changer). Mender ni akan converts alternating current (AC) of one frequency to alternating current of another frequency lah.

  2. Engineer1 says:

    Cool…Did anyone get on the wagon by answering that question?

    That would be by step down frequency converter. (cross my fingers)

  3. juan says:

    i’m in mechanical field but i think it shud be the transformer job to step-up or step-down isn’t… correct me if i’m wrong.. huaahahah (going to grad soon, kalu kene interview keje mcm ni bsk … matila haahaha)

  4. musa says:

    I m just a mechanical engineer and just guessing. I thing to change 60hz to 50hz is by converting to the alternating current to DC current. From the DC current then, u can convert to whatever AC current frequency that you want. Am i guessing correctly or just one of a weird answer?
    Thank you

  5. Jabbathehutt says:

    Let me ask the following;

    If you run a power plant, and it supplies a grid. what will happen if a 3MW power plant output only powers a few light bulbs if everyone is asleep. If you use only a few kW, where the rest of the power goes? Does it follow the law of conservation of energy (is it correct to say if u generate 3MW, u should use 3MW? if it is converted to heat, does it mean that you got 3MW of heat generated, which could melt your generator?)

    In oil and gas, a sample contains more iso component than normal (i.e. iC4 is more than nC4) why? why not normal component should be more?

  6. zzeed says:

    use frequency changer/converter. it’s essentially like what musa says, a rectifier that converts it to DC and then inverter that moves it back to AC, frequency of your choosing.

    step up/or down transformer is used only when voltage change is desired.

  7. zzeed says:


    a lot of the losses is in the distribution. if you don’t have a good power line design around the plant, you overshoot the distance the power travels all over the plant via all cable trunks, termination, and so on.

  8. sohas says:

    Yes, Musa is right….AC to DC via a rectifier, then DC back to AC via an inverter to the desired frequency, like matching everything back to the grid frequency of 50Hz.

  9. sohas says:

    But thats not chemical based what…

  10. sohas says:

    Losses in distribution is only cumulatively about 10%. The scale of which you talk about has a massive difference. I do not see why the generator needs to produce 10^3 times the requirement. When generation>demand, the frequency of the grid will rise – encouraging extra generators to go offline.

  11. zzeed says:

    wata: what about those who likes gadgetry? hehe

    • Wata says:

      zzeed: gadget hounds can apply to tech startups. Me, I want to run a business, not burn up VC funds like a house on fire.

  12. sohas says:

    do you need people trained in enginering to work on the commercial side of things? where r u based?

    • Wata says:

      Soha: we are looking for technical people. In the future, we may need a technoprenuer, but no promises. Where we based? In good old Subang Jaya.

  13. Jabbathehutt says:

    ah so…….

    with commercial, does that mean helping out in extending the crime empire of jabba?

  14. Fadzli says:

    (technical+creativity )/ time = technology + money

  15. sohas says:

    very nice equation…i would like to quote that, if its possible?

  16. sohas says:

    wata, good luck in getting the right people…with more people geting laid off, many would seek to join somewhere for a fraction of the pay!!! good timing in a way…

  17. Irvinski says:

    Depending on the load. I have seen someone use an inverter (Variable Frequency Drive) for a small application… about 15kW.

  18. frenic says:


    in term of freq control and voltage control..
    no need to transform what..still can be used..but equip need to be derated la..just to adapt the cosequence.

    or used frequency modulation technique..??

  19. salleh says:

    Hi Wata, know any Construction Engineer with MRU experiance, with lots of experiance.

  20. salleh says:

    Hi Wata, yes it mercury removal unit, maybe later I be looking for that as this the constuction stage, got to wait for production.

  21. Jabbathehutt says:

    looking on behalf of an indonesian client? know there’s a MRU job around here with

  22. Lee says:

    So..the correct answer is using the frequency converter?? But I think normally during interview, the question more based on soft skill question.

  23. salleh says:

    Hi Jabba : No Malaysian client, Indonesia would be G&G, Finance and Procurement.

  24. Jabbathehutt says:

    Salleh: I forsee Myanmar and Vietnam to be the next hotspot. Synergy will be breaking there soon.

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