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3 marksLogic Gates

CAPE Physics Unit 2 · 2006 · Paper 2 · Question 7(c)(ii)

Design of a logic system monitoring two doors using NAND gates where logic 1 represents closed, logic 0 represents open, requiring logic 1 output when only one door is open.

Draw the logic circuit which uses only NAND gates and a single led to indicate logic 1 output.

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Other parts of this question

  1. 7(a)(i)Name an item found in the home which is controlled by a microprocessor.[1 mark]
  2. 7(a)(ii)State the function of the microprocessor in the item you have named.[1 mark]
  3. 7(a)(iii)State TWO benefits resulting from the use of microprocessors.[2 marks]
  4. 7(b)(i)Identify the logic gates shown in Figure 9 and write out their respective truth tables.[3 marks]
  5. 7(b)(ii)Draw the truth table for the entire circuit shown in Figure 9 and state its function.[3 marks]
  6. 7(c)(i)Write the truth table for the circuit.[1 mark]
  7. 7(c)(iii)What single logic gate is the circuit in (c)(ii) equivalent to?[1 mark]
  8. 7(d)(i)State which diodes conduct when terminal X is positive with respect to terminal Y.[2 marks]
  9. 7(d)(ii)The input terminals X and Y are connected to the secondary coil of an ideal transformer. The primary coil contains 22000 turns and is connected to a…[3 marks]

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