electronic decices

Question 1

one can change capacitance by changing

Answer 1

area of cross section or distance between plates or the dielectric material between plates

Question 2

mica capacitor has what kind of build

Answer 2

stacked aluminium sheets with mica in between

Question 3

mica capacitor can withsatnd upto _v

Answer 3

500v

Question 4

mica capacitor leakage resistance

Answer 4

1k ohm

Question 5

ceramic capacitor can withstand voltage upto

Answer 5

6k v

Question 6

ceramic capacitor leakage tesistance

Answer 6

1000m ohm

Question 7

in paper capacitor removing paper causes

Answer 7

shortcircuit

Question 8

paper capacitor advantages

Answer 8

can be rolled
large capacitance with minimum valence
voltage rating 100v to several 1000 volt

Question 9

disadvantage of paper capacitor

Answer 9

there is a chance of leakage of the charge through the dielectic material ideally leakage resistance must be infinitely high

Question 10

inductor is a define

Answer 10

wire in the form of. a coil

Question 11

in capacitor i is prop to

Answer 11

dv/dt

Question 12

when and why does back emf exist

Answer 12

back emf is caused due to a change on the direction of current which cause a change is magbetic field aka dphi/dt exist in this case an this causes an emf in opposition to the current direction to form called back emf

Question 13

for ideal capacitor and inductor the power dissipation is

Answer 13

0 as p=vicostheta and theetha =90

Question 14

vaccum tubes are not used in

Answer 14

low power situations

Question 15

semiconductor advantages over vaccum tubes

Answer 15

reliable
easy to use
cheap
less power draw
high efficiency small in size

Question 16

band theory diagram (block diagram)
doesnt provide info about

Answer 16

the effective occupation of wlwctron in an energy level

Question 17

the barrier potential in a semi conductor depends on the

Answer 17

type of material used
doping amount
temperature