# Humour (Engineering Viva)

From: sreenath akula (akula@onebox.com)
Date: Fri Jan 11 2002 - 15:56:31 EET

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.

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 base, 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)

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

Candidate: By using a miniature circuit breaker.

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!

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 transfomer 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!'

--
sreenath akula

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