Question

Q59 Which of the following statements are correct regarding anode current in diode tube circuit?
I. At lower values of anode potential, anode current is limited by space change
II. At higher values of anode potential, anode current is limited by temperature of cathode
III. Saturated value of anode current is limited by the work function of material of cathode, when the remaining physical conditions are identical
IV. Geometry of the diode tube does not influence the anode current
Choose the correct answer from the options given below.
Ops: A. II, III and IV
B. I, II and IV
C. II and III
D. O I, II and III​

Answer 1

Answer:

I think b is the correct answer

Answer 2

Statement 1 2 and 4 are correct.

Option b is the correct answer

Explanation:

• The the anode current is determined by the difference between the anode and the cathode and not on the geometry of the diode tube.
• If there is high value of the anode potential then there is limitation by the the space charge and the temperature of the electrode. This is because with increase in temperature there is decrease in the  conductivity of the electrode.

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