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The plate voltage of a triode is increas...

The plate voltage of a triode is increased from 225 V to 250 V, the grid voltage is changed from 4 to `-4.7V` to maintain plate current constant. The amplification factor of the tube is

A

35.7

B

2

C

70

D

20

Text Solution

Verified by Experts

The correct Answer is:
A
`V_(p_(1))=225V, V_(p_(2))=250V, V_(g_(1))=-4V`
`V_(g_(2)) = -4.7V`
`mu=((DeltaV_(p))/(DeltaV_(g)))_(l_(p))=(25)/(0.7) = 35.7`
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