Question

The two transistors in a SCR consists of following transistors

• A. one npn and other pnp
• B. both n-p-n
• C. both p-n-p
• D. one npn and other UJT

Hint:

SCR operation is explained using two-transistor model (npn + pnp).

Answer 1

The Correct Option is A

Concept: SCR can be represented using two-transistor analogy.

Step 1: Structure of SCR It consists of four layers: p-n-p-n.

Step 2: Equivalent model This can be split into two transistors.

Step 3: Transistor types One transistor is pnp and the other is npn.

Step 4: Feedback mechanism These transistors provide regenerative feedback.

Step 5: Conclusion \[ \boxed{\text{One npn and one pnp}} \]

Final Answer: \[ \boxed{(A)} \]