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Distinguish between positive feedback an...

Distinguish between positive feedback and negative feed back.

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If the feedback voltage is in the same phase to that of the input voltage, then the feedback is said to be positive
If the feedback voltage is in the opposite phase to that of the input voltage, then the feedback is said to be negative.
an amplifier with a positive feedback is a stable oscillator in which the gain in more than one.
A transistor circuit with a negative feedback is called as an amplifier and whoe gain is less than one and can never work as an oscillator.
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SUBHASH PUBLICATION-SEMICONDUCTOR ELECTRONICS-TWO MARKS QUESTIONS WITH ANSWERS
  1. Draw a neat labelled diagram of a transistor amplifier in a CE mode.

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  2. Explain briefly Barkhausen's criteria.

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  3. Distinguish between positive feedback and negative feed back.

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  4. What is Boolean algebra?

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  5. Give the logic symbol, Boolean expression and truth table of an AND ga...

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  6. Write the symbol and truth table for a logic NOT gate

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  7. Give the logic symbol, Boolean expression and truth table of a NAND ga...

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  8. Give the logic symbol, Boolean expression and truth table of a NOR gat...

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  9. Write the Boolean equation for a NOR gate and a NAND gate

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  10. Name the two types of integrated circuits.

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  11. How are electron-hole pairs created in a semiconductor?

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  12. When does electron-hole recombination take place?

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  13. Give a schematic two-dimensional representation of an intrinsic Si or ...

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  14. Draw energy band diagram of an intrinsic semiconductor at room tempera...

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  15. Draw I-V characteristics of a Zener diode with neat labelling.

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  16. Draw a neat labelled diagram of a Zener diode used as a DC voltage reg...

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  17. Write the symbols for a NPN and PNP transistors.

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  18. Draw the output characteristic curve for a CE transistor circuit.

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  19. Give the expression for voltage gain in a CE amplifier along with the ...

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  20. What is a tuned circuit?

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