To get a degree in Engineering...all that is needed is the presence of mind....

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.

Interviewer: "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!"