EC > GATE 2017 SET-1 > BJT as a Switch
In the figure shown, the npn transistor acts as a switch. For the input Vin(t) as shown in the figure, the transistor switches between the cut-off and saturation regions of operation, when T is large.
Assume collector-to-emitter voltage at saturation VCE(sat)=0.2V and base-to-emitter voltage VBE=0.7V The minimum value of the common-base current gain (α) of the transistor for the switching should be
Correct : 0.9
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