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  4. Before invention of transistor, vacuum tubes were used and these were named according to number of electrodes they have. Now, match these with number of electrodes Column I Column II A Pentode 1 2 B Tetrode 2 3 C Triode 3 4 D Diode 4 5

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Q. Before invention of transistor, vacuum tubes were used and these were named according to number of electrodes they have.
Now, match these with number of electrodes
Column I Column II
A Pentode 1 2
B Tetrode 2 3
C Triode 3 4
D Diode 4 5

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

Correct answer is (d) A-(4), B-(3), C-(2), D-(1)