Best answer by B.E students during viva

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" !!!!!!