Quick PSU switch mode question

Discussion in 'Homework Help' started by manish1991, Nov 21, 2013.

  1. manish1991

    Thread Starter New Member

    Jun 17, 2013
    couple of switch mode power supply questions that i discovered and am interested in:

    1) What feature can indicate a PSU is that of a switching type?

    a) 4A out put current
    b) LED power indicator
    c) Mains connector
    d) Selectable output voltages

    2) Plug top chargers for cell phones are usually

    a) linear regulated
    b) Switch mode
    c) SMPS
    d) transformerless DC-DC converter

    My answer:
    1) d
    2) c

    Can someone please confirm that i have made the right choices? or correct me if i am wrong

    Thank you

  2. MaxHeadRoom


    Jul 18, 2013
    Actually none of 1 (a,b,c,d) necessarily indicate Switching type?
    They can all apply to either linear or switching, IMO.