Placement Papers - ISRO

Hi Friends

I appeared for ISRO written examinatiom on 22 Apr 2007 for the post of Scientist Engineer.

Paper was totally technical. Questions which I remember are as follows:-

1) output resistance of ideal OP AMP is:-
a) 0   b) 1  c) infinite  d) very high
ANS: a) 0

2) waveguide acts as:-
a) LPF  b) HPF  c) BPF  d) BRF
ANS: b) HPF

3) quality factor of series RLC ckt. increases with:-
a) increase in R b) decrease in R c) doesn\'t depends on R  d) none of these
ANS: b) decrease in R.

4) energy stored in capacitor is given by:
a) CV   b) 0.5CV  c) CV2  d) 0.5CV2
ANS: d)

5) CMRR of an OP AMP is given as 80db and Ad is 20000. Value of Acm will be:-
a) 4  b) 8  c) 2  d) 1
ANS: c) 2

some basic questions were based upon digital electronics, ckt. analysis, antenna theory, zener doides.

Archana Kumawat