1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Electronics questions - help needed

  1. Mar 1, 2012 #1
    Electronics questions -- help needed

    1. The problem statement, all variables and given/known data

    Revered members,
    I list below some of the questions asked in a competitive exam to test the proficiency of electronics. I request the members to give the answers. I have produced the answers which i have written, below each question. I require your help in ascertaining if they are correct.
    An oscillator differs from an amplifier , because it
    a) has more gain b) requires no input signal c) requires no DC supply d) always has the same input
    Ans: requires no input signal
    Which of the following devices has the highest input impedance
    a) JFET b) MOSFET C) Crystal Diode d) Ordinary transistor
    Ans : Ordinary Transistor
    Which of the following is not a characteristic of UJT
    a) Saturation Current b) Negative Resistance c) Peak point Voltage d) Bilateral Conduction
    Ans : Saturation Current
    A zener diode is destroyed if it
    a) is forward biased b) is reverse biased c) carries more than the rated current d) carries less than the rated current
    Ans : carries more than the rated current
    In a full wave rectification, if the input frequency is 50 Hz, then the output has a frequency of
    a) 100 Hz b) 50 Hz c) 25 Hz d) 200 Hz
    Ans : 50 Hz
    The multivibrator which generates square wave of its own is the -------- multivibrator
    a) monostable b) astable c) bistable d) tristable
    Ans : astable
    The output impedance of a transistor is
    a) high b) low c) infinity d) zero
    Ans : zero
    Revered members, I have reproduced the questions verbatim.

    2. Relevant equations



    3. The attempt at a solution
     
    Last edited by a moderator: Mar 2, 2012
  2. jcsd
  3. Mar 2, 2012 #2

    vela

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Education Advisor

    Re: Electronics questions -- help needed

    You need to explain your thinking behind your responses.
     
  4. Mar 2, 2012 #3

    NascentOxygen

    User Avatar

    Staff: Mentor

    Re: Electronics questions -- help needed

    It's a big call to state that the output impedance of anything is zero!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Electronics questions - help needed
Loading...