E-TC-1975-COEP: 2010

Monday, November 29, 2010

These are answers 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 Last one is the best one ************************************************************************************************************** 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. ************************************************************************************ 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" !!!!!!