Submitted Questions

  • How size of UPS depends on frequency?

    How size of UPS depends on frequency? I mean proportional, inversely proportional or proportional to square of frequency?

    Umair Anwar

    • Nov 13th, 2014

    Because core size of transformer directly depend on frequency and transformer primary element.

  • Size comparison of AC and DC machine

    which is bigger in size AC or DC, of same rating? As I think DC is right answer but HOW? Explain?

    Pasupulati. V. N. Sekhar

    • Jan 17th, 2012

    The main difference in the size come because of the set up that is present in the DC machines i.e., in order to tap DC voltage generated we require the set up such as Commutator and brush arrangement ...

  • working tube light?

    How choke coil and starter gives high voltage(1200v) across tube light to ionise gases in starting while after starting it limits voltage?


    • Jan 16th, 2012

    After supplying 220v, the inductor will be charged. After certain time constant that inductor becomes open circuited. when inductor while charging, suddenly becomes open circuited means it develops hi...