This is how engineers are  

People come up with peculiar or funny answers in interviews or exams:

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 DC. If
it
gets stuck, it
was AC.

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!"

sadly, I am also an engineer!