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This is best answer by B.E students during viva.This one is for those who had nightmares during their Engineering Viva's....:lol::lol: 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: How 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!" :lol::lol::lol::lol:
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