EASA Part 66 : Digital Question5
Question Number. 1. What is the equivalent of this gate?. Option A. = (NOT-A + NOT-B). Option B. = (A + B)NOT. Option C. = (A.B)NOT.
Correct Answer is. = (NOT-A + NOT-B). Explanation. Draw the truth table for the NAND gate, then draw the truth tables for each answer in turn until you get one to match.
Question Number. 25. To get logic 1 using this gate. Option A. A and B = 0. Option B. A or B = 1. Option C. A and B = 1.
Correct Answer is. A and B = 0. Explanation. NIL.
Question Number. 13. What sort of gate is this?. Option A. NOT gate. Option B. NOR gate. Option C. Or gate.
Correct Answer is. NOR gate. Explanation. NIL.
Question Number. 17. The output of an OR gate having two inputs A and B is logic 0. The two inputs will have the logic states of. Option A. A = 1, B = 0. Option B. A = 0, B = 1. Option C. A = 0, B = 0.
Correct Answer is. A = 0, B = 0. Explanation. NIL.
Question Number. 16. The output of an AND gate having two inputs A and B is logic 1. The two inputs will have the logic states of. Option A. A = 0, B = 0. Option B. A = 1, B = 0. Option C. A = 1, B = 1.
Correct Answer is. A = 1, B = 1. Explanation. NIL.
Question Number. 33. A NAND gate has inputs A and B and output C. If the output (c) was zero, what are the inputs?. Option A. A=1 B=1. Option B. A=0 B=0. Option C. A=1 B=0.
Correct Answer is. A=1 B=1. Explanation. NIL.
Question Number. 32. What input is required to activate the relay shown?. Option A. A=0 B=1. Option B. A=1 B=0. Option C. A=1 B=1.
Correct Answer is. A=1 B=1. Explanation. NIL. .
Question Number. 12. What is this truth table?. Option A. NOR gate. Option B. NOT gate. Option C. AND gate.
Correct Answer is. AND gate. Explanation.
Question Number. 2. A NOR gate with both inputs inverted becomes a. Option A. NAND gate. Option B. AND gate. Option C. OR gate.
Correct Answer is. AND gate. Explanation. NIL.
Question Number. 20. Which logic gate has both inputs high to get an output?. Option A. AND gate. Option B. OR gate. Option C. NAND gate.
Correct Answer is. AND gate. Explanation. NIL.
Question Number. 26. What logic gate would this circuit represent?. Option A. NAND Gate. Option B. NOR gate. Option C. AND gate.
Correct Answer is. AND gate. Explanation. NIL.
Question Number. 4. This truth table is for a. Option A. OR gate. Option B. AND gate. Option C. NAND gate.
Correct Answer is. AND gate. Explanation. NIL.
Question Number. 8. What sort of gate requires two positive voltages to operate?. Option A. AND. Option B. OR. Option C. NOT.
Correct Answer is. AND. Explanation. NIL.
Question Number. 27. What type of gate is this?. Option A. NAND. Option B. NOT. Option C. E-OR.
Correct Answer is. E-OR. Explanation. E-OR is another name for XOR.
Question Number. 18. What is this symbol?. Option A. Exclusive AND gate. Option B. Exclusive NOR gate. Option C. Exclusive OR gate.
Correct Answer is. Exclusive OR gate. Explanation. NIL.
uestion Number. 10. Which logic gate has this truth table?. Option A. NOT. Option B. NAND. Option C. Exclusive OR.
Correct Answer is. Exclusive OR. Explanation. NIL.
Question Number. 28. What sort of gate requires two negative input voltages to operate?. Option A. NAND. Option B. OR. Option C. NOT.
Correct Answer is. NAND. Explanation. NIL.
Question Number. 28. What sort of gate requires two negative input voltages to operate?. Option A. OR. Option B. NAND. Option C. NOT.
Correct Answer is. NAND. Explanation. NIL.
Question Number. 3. Adding invertors to the two inputs of an AND gate makes a. Option A. OR gate. Option B. NOR gate. Option C. NAND gate.
Correct Answer is. NOR gate. Explanation. NIL.
Question Number. 19. What Logic Gate does this switch circuit indicate?. Option A. NOR gate. Option B. AND gate. Option C. OR gate.
Correct Answer is. OR gate. Explanation. NIL.
Question Number. 5. Which logic gate can be represented as a parallel circuit?. Option A. OR gate. Option B. Exclusive OR gate. Option C. NAND gate.
Correct Answer is. OR gate. Explanation. NIL.
Question Number. 11. Which logic gate can be represented as a parallel circuit?. Option A. Exclusive OR. Option B. NAND. Option C. OR.
Correct Answer is. OR. Explanation. NIL.
Question Number. 9. When will a NAND gate give logic 0 at the output?. Option A. When both inputs are at 1. Option B. When the inputs are different. Option C. When both inputs are at 0.
Correct Answer is. When both inputs are at 1. Explanation. NIL.
Question Number. 31. The truth table of A =0011 B=0101 and =0110 indicates that the logic device is. Option A. an ECLUSIVE OR gate. Option B. a NOR gate. Option C. an AND gate.
Correct Answer is. an ECLUSIVE OR gate. Explanation. NIL.
Question Number. 22. An AND gate with inverted inputs and an inverted output is equivalent to. Option A. an AND gate. Option B. a NOR gate. Option C. an OR gate.
Correct Answer is. an OR gate. Explanation. NIL.
Question Number. 7. An AND gate output is 1 when inputs are. Option A. both 1. Option B. both 0. Option C. 1 and 0.
Correct Answer is. both 1. Explanation. NIL.
Question Number. 6. Making an inverter from a NAND or NOR gate is achieved by. Option A. connecting the inputs. Option B. inverting the input. Option C. connecting two in series.
Correct Answer is. connecting the inputs. Explanation. NIL.
Question Number. 30. Switching within logic gates is normally achieved with the use of. Option A. BTB's. Option B. relays. Option C. diodes.
Correct Answer is. diodes. Explanation. NIL.
Question Number. 21. A NAND and NOR to become a NOT gate have. Option A. inputs inverted. Option B. outputs inverted. Option C. inputs connected together.
Correct Answer is. inputs connected together. Explanation. NIL.
Question Number. 14. The output of a NOT gate is logic 1. The input is. Option A. logic 0. Option B. logic 1. Option C. both logic 1.
Correct Answer is. logic 0. Explanation. NIL.
Question Number. 15. When the voltage that represents a logic 1 state is less than the voltage that represents a logic 0 state, the logic being used is. Option A. either positive or negative. Option B. positive. Option C. negative.
Correct Answer is. negative. Explanation. NIL.
Question Number. 24. A logic 1 may be represented in an analogue system by (where Q is an output of a latch / flip-flop). Option A. switch closed / light off / Not Q. Option B. positive / magnetised / Q. Option C. switch open / light on / Q.
Correct Answer is. positive / magnetised / Q. Explanation. NIL.
Question Number. 29. In Positive Logic representation. Option A. both states have same positive voltages but stage 1 has more current. Option B. state 1 is more positive than state 0. Option C. state 0 is more positive than state 1.
Correct Answer is. state 1 is more positive than state 0. Explanation. NIL.
Question Number. 23. Logic gates internal operating mechanisms are produced from. Option A. thin film resistors. Option B. transistors. Option C. diodes.
Correct Answer is. transistors. Explanation. NIL.
