Question66:-The ripple factor in a rectifier circuit indicates
A:-amount of a.c. voltage present in output
B:-amount of d.c. voltage present in output
C:-change in d.c. voltage when input a.c. changes
D:-change in d.c. voltage when load. changes
Correct Answer:- Option-A
Question67:-The cathod of a zener diod in a voltage regulator is normally
A:-more positive than the anode
B:-more negative than the anode
C:-at +0.7 V
D:-grounded
Correct Answer:- Option-A
Question68:-An oscillator differs from an amplifier because
-it has more gain
:-it requres no input signals
C:-it requres no d.c. supply
D:-it always has the same output
Correct Answer:- Option-B
Question69:-If maximum and minimum amplitudes of an amplitude modulated waves are 10V and 5V respectively, the
modulation index is
൧-2
8:
:-3.3
D:-0.33
Correct Answer:- Option-D
Question70:-Thermal runaway is not possible in FET because as the temperature of FET increases
A:-the mobility decreases
B:-the transconductance increases
C:-the drain current increases
D:-none of the above
Correct Answer:- Option-A
Question71:-The dimension of Cantor set is

Correct Answer:- Option-B
Question72:-The fixed points of the Logistic map *x_(n+1)* = a’x_(n)° (1-'x_(n)*) are
A and x=1-(1)/(a)°
‘0 and 18
: and x=1/a
D:-x=1 and x=1- *(1)/(a)’
Correct Answer:- Option-A
Question73:-A stable and unstable fixed point collide each other and vanish as the control parameter is decreased in
A:-Hopf bifurcation
itchfork bifurcation
C:-Transcritical bifurcation
D:-Saddle node bifurcation
Correct Answer:- Option-D
Question74:-If 10> and (12 are eigen states of number operator which of these represent a state orthogonal to
»(L)(sqrt(2)) (10> + 11>)
A:-(1)/(sqrt(2))* (05 -112)
8:- ` (1)/(5011(2))` (0> + 12)
0112
D:-l0>
Correct Answer:- Option-A
Question75:-If In> represent an eigen vector of number operator with eigen value n, the state ataataln> has eigen value’ ~
Arn
B:-n+1