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Best answer by B.E students during viva...............

Posted By:BangaruBabuPureti       Posted Date: May 13, 2010    Points: 10    Category: Computer    URL: http://www.dotnetspark.com  
 

This is best answer by B.E students during viva.  >---------------------> This one is for those who had nightmares during their Engineering Viva's (EEEs and ECEs). They bring back fond memories for those who care to smile at the past.

 

 

**************************************************************************************************************    
Interviewer:
 Why is a thicker conductor necessary to carry a current in
  A.C.as  compared to D.C. ?
Candidate
  : An AC current goes up and down (drawing a sinusoid) and requires more space inside the wire, so the wire has to be thicker.

************************************************************************************
 

External   (to student) :  "Why does a capacitor block DC but allow AC To pass through ?
Student:
  See, a capacitor is like this ---| |--- , OK. DC comes straight, like this ----------, and the capacitor stops it. But AC,goes UP, DOWN, UP DOWN and jumps right over the capacitor!" ------------------- good one : - )

************************************************************************************

Interviewer:
How will you tell if that wall outlet carries AC or DC?
Candidate:
  I will put my finger in. If it is pushed away, it is AC. If it gets stuck, it was DC.

************************************************************************************

Interviewer:
H! ow will you reverse direction of an Induction motor?
Candidate:
  I will remove the four bolts at the x-ud, turn the motor around, and put back the bolts.    

************************************************************************************

Interviewer:
 How do you start a synchronous motor?
Candidate:
  Vrrrrrrrmmmmmmmmmmmmmmmmmmm   (in rising pitch)
 

Interviewer:  Stop! Stop!
Candidate:
rrrrrrrmmmmmmmmmmmmmmmmmmmm   (in falling pitch)  

************************************************************************************
 

Examiner:  "What is a step-up transformer?"
Student:
  "A transformer that is put on top of electric poles."
Examiner (smiling):
 "And then what is a step-down transformer?"
Student (hesitantly):
"Uh - A transformer that is put in the x-udment or in a pit?"
Examiner (pouncing):
 "Then what do you call a transformer that is installed on the ground?"
(
Student knows he is caught-can't answer )
Examiner (impatiently):
 "Well?"
Student (triumphantly):
  "A stepless transformer, sir!"

**************************************************************************************************************  

Examiner: Do you know Ohm's Law???
Student
:
Sure Sir...
Examiner
:
Well...Narrate me...
Student
:
Which one Sir?? 1st or 2nd Law???
Examiner
(getting shocked):
How many Ohm's Law do you know???
Student
(with confidence):
Well sir...there are two Ohm's Laws.Every one knows...
Examiner
(Smiling):
Ok. Then tell me the 2nd one.
Student
(thinking and thinking):
Sir.I can't remember the entire law exactly...But the last portion of the law I can remember.
Examiner:
Ok. You tell me the last portion only.
Student
:
Well sir. The last portion of the law tells like "This is called Ohm's Law" !!!!!!



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