Question 1 of 20
Q
Low plate current may be caused by:
A
Low filament emission and voltage
B
Excessive bias value, shorted screen by-pass capacitor
C
Open grid circuit, low screen grid supply voltage
D
All of the above
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Question 1 / 20N7jNstOtbugCsWoyGdfg
Question 1 of 20N7jNstOtbugCsWoyGdfg

Low plate current may be caused by:

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Question 1 of 20
N7jNstOtbugCsWoyGdfg
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Low plate current may be caused by:

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🔍 Key Concepts

• How plate current in a tube depends on filament (cathode) emission, grid bias, and screen grid voltage • What happens to electron flow when bias is more negative or when the grid circuit is open • How a screen grid and its supply voltage affect plate current in a tetrode/pentode

💭 Think About

• For each option, ask yourself: would this condition tend to REDUCE electron flow from cathode to plate, or increase it? • Think about how low filament voltage changes the number of electrons available for emission—does that raise or lower plate current? • Consider what happens to plate current if the grid becomes more negative (via bias or open grid) or if the screen grid voltage drops or is bypassed incorrectly.

✅ Before You Answer

• For each listed fault, decide: does it make plate current lower, higher, or leave it mostly unchanged? Eliminate any that clearly would not LOWER plate current. • Review how an open grid circuit usually drives the grid potential and what that does to plate current. • Confirm how low screen grid voltage versus a shorted screen bypass capacitor would influence the plate current in a screen-grid tube.

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