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Concepts Of Physics MCQ Edition [Volume 2]
Exam
Concepts Of Physics MCQ Edition [Volume 2]
Subject
Physics
Chapter
Electric Current through Gases

Concepts Of Physics MCQ Edition [Volume 2] · Physics · Electric Current through Gases

Determine the amplification factor of a triode valve that has a...

Determine the amplification factor of a triode valve that has a plate resistance of 2 kΩ2 \text{ k}\Omega and a transconductance of 2 millimho2 \text{ millimho}.

Options

  1. A4
  2. B4000
  3. C1
  4. D0.25

Correct answer

A. 4

Step-by-step solution

The amplification factor μ\mu of a triode valve is related to its plate resistance rpr_p and transconductance gmg_m by the relation:

μ=rp×gm\mu = r_p \times g_m

Given:

rp=2 kΩ=2×103Ωr_p = 2 \text{ k}\Omega = 2 \times 10^3 \Omega

gm=2 millimho=2×10−3Ω−1g_m = 2 \text{ millimho} = 2 \times 10^{-3} \Omega^{-1}

Substituting the values into the formula:

μ=(2×103)×(2×10−3)=4\mu = (2 \times 10^3) \times (2 \times 10^{-3}) = 4
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