This one is for those who had nightmares during their Engineering
Viva's.
They bring back fond memories for those who care to smile at the past..

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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.

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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.

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Interviewer: How will you reverse direction of an Induction motor?

Candidate: I will remove the four bolts at the base, turn the motor
around, and put back the bolts.

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Interviewer: How do you start a synchronous motor?

Candidate: Vrrrrrrrmmmmmmmmmmmmmmmmmmm (in rising pitch)

Interviewer: Stop! Stop!

Candidate: rrrrrrrmmmmmmmmmmmmmmmmmmmm (in falling pitch)

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Interviewer: How do you limit surge current within an integrated
circuit?

Candidate: By using a miniature circuit breaker.

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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!"

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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 basement 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!"

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