Q. 12
The power delivered in the plate circuit of a diode is 1.0 W when the plate voltage is 36 V. Find the power delivered if the plate voltage is increased to 49 V. Assume Langmuir – Child equation to hold.
Answer :
Given P1=1 W, VP1= 36 V, VP2= 49 V
We know,
According to Langmuir-Child equation
where ip is the plate current and Vp is the plate voltage
Now,
∴=.04411×49=2.16
W=2.2 W
Rate this question :






















A triode has mutual conductance = 2.0 millimho and plate resistance = 20 kΩ. It is desired to amplify a signal by a factor of 30. What load resistance should be added in the circuit?
HC Verma - Concepts of Physics Part 2Find the values of rp, μ and gm of a triode operating at plate voltage 200 V and grid voltage –6 V. The plate characteristics are shown in figure.
HC Verma - Concepts of Physics Part 2
The plate current in a triode can be written as
Show that the mutual conductance is proportional to the cube root of the plate current.
HC Verma - Concepts of Physics Part 2
The gain factor of an amplifier is increased from 10 to 12 as the load resistance is changed from 4 kΩ to 8 KΩ. Calculate (a) the amplification factor and (b) the plate resistance.
HC Verma - Concepts of Physics Part 2The plate current, plate voltage and grid voltage of a 6F6 triode tube are related as
Ip = 41(Vp + 7 Vg) 1.41, Where Vp and Vg are in volts and ip in microamperes. The tube is operated at Vp = 250 V, Vg = –20 V. Calculate
(a) the tube current,
(b) the plate resistance,
(c) the mutual conductance and
(d) the amplification factor.
HC Verma - Concepts of Physics Part 2
The plate current in a diode is 20 mA when the plate voltage is 50 V or 60 V. What will be the current if the plate voltage is 70V?
HC Verma - Concepts of Physics Part 2