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The output characteristics of a JFET closely resemble the output characteristics of a __________ Valve

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The output characteristics of a JFET closely resemble the output characteristics of a __________ Valve

(a) diode

(b) pentode

(c) triode

(d) tetrode

I had been asked this question in an interview for job.

Question is from Transconductance Amplifiers topic in portion Differential and Multistage Amplifiers of Electronic Devices & Circuits

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The correct answer is (b) pentode

The explanation: The pentode consists of an evacuated glass envelope containing five electrodes in this order: a cathode heated by a filament, a control grid, a screen grid, a suppressor grid, and a plate (anode).

Similar to a pentode valve, with which the junction FET greatly resembles in its operational characteristics, the simplest way of calculating stage gain is by the relationship –

A = gfs . RL

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