alleryStart learning →Common-emitter current gain β (or h_FE):
Aβ = I_C/I_B (typically 20-500 for BJTs)
Bβ = I_E/I_C
Cβ = 1
Dβ = I_E
Answer & Solution
Correct answer: A. β = I_C/I_B (typically 20-500 for BJTs)
β = I_C/I_B (DC current gain). Range 20-500 typical.
Higher for small-signal transistors, lower for power.
Related to common-base α: β = α/(1-α), α = I_C/I_E close to 1 (~0.99). I_E = I_B + I_C.
Keep practising GATE ECE — Core
Browse all GATE ECE — Core questions for GATE ECE, or explore more Electronics & Communication topics.
Related questions
For n-bit ADC with full-scale V_FS, resolution (LSB) is:Cutoff frequency of RC low-pass filter:Wave equation in vacuum (Maxwell):VSWR (Voltage Standing Wave Ratio) for matched load (R_L = Z_0):Characteristic impedance of a lossless transmission line:Shannon channel capacity:FM (frequency modulation) varies:In AM (amplitude modulation), modulating signal varies: