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Electronic Devices and Circuits

Q1:
Discrete transistors T1 and T2 having maximum collector current rating of 0.75 amp are connected in parallel as shown in the figure, this combination is treated as a single transistor to carry a total current of 1 ampere, when biased with self bias circuit. When the circuit is switched on, T1 draws 0.55 amps and T2 draws 0.45 amps. If the supply is kept on continuously, ultimately it is very likely that

A Both T1, and T2 get damaged

B Both T1, and T2 will be safe.

C T1 Will get damaged and T2 will be safe

D T2 will get damaged and T1, will be safe.

ANS:C - T1 Will get damaged and T2 will be safe

T1 draws 0.55 A and T2 draws 0.45 A, T1 will get more heated and correct increase. Ultimately, I1 = 1A and I2 = 0.



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