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GATE ECE 1991 | Question-18

Discrete transistors $T_1$ and $T_2$ having maximum collector current rating of $0.75$ amps 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, $T_1$ draws $0.55$ amps and $T_2$ draws $0.45$ amps. If the supply is kept on continuously, ultimately it is very likely that

  1. both $T_1$ and $T_2$ get damaged
  2. both $T_1$ and $T_2$ will be safe
  3. $T_1$ will get damaged and $T_2$ will be safe
  4. $T_2$ will get damaged and $T_1$ will be safe
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