Question

What is the intrinsic stand-off ratio(η) of a unijunction transistor when RB1 = 10kΩ and RBB = 15kΩ?

(a) 0.67

(b) 0.55

(c) 0.80

(d) 0.44

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This interesting question is from The Unijunction Transistors in portion Field-Effect Transistors of Electronic Devices & Circuits

Answer 1

The correct option is (a) 0.67

To elaborate: The intrinsic stand-off ratio(η) is equal to the ratio RB1 / RBB. Standard values of η range from 0.5 to 0.8. Given RB1 = 10kΩ and RBB = 15kΩ:

η = RB1 / RBB = 10 / 15 = 0.67