name test 3 Next test is Wed April 18 2007






(12)(13)(14)15)

  1. (a) When is the next test? ______(b) When is the final exam? ______
  2. What is the Department of Defense

symbol for a NOR device?

  1. What is the equivalent

circuit for a NAND device?

  1. Does item (5) above function like a NAND device? Yes __ No ____
  2. If both inputs in item (4) above are active the contacts are closed? Yes __ No ____
  3. Both item (6) inputs must be passive for the contacts to be closed? Yes __ No ____
  4. What kind of relay is the device shown as item 6 above? ______

8. Does item (2) above function like an OR device? Yes __ No___

  1. Which item above is the best symbol to represent a counter? ______
  2. Is the LED in item 7 ON (glowing) or OFF if both inputs arepassive? ON__ OFF___
  3. What item above shows a function diagram of an instrument system

that will close the relay contacts if one of its inputs becomes passive? ______

  1. What is the base 8 value of the unique input pattern for an 7 input AND device? ______
  2. What is the equivalent resistance for a circuit with a 10 ohm resistor is in series parallel set of two 30 ohm resistors? ______.

14. Volt is 1 Joule of energy per 1 Coulomb of charge. Yes __ No ___.

15. Item (14) is a normally closed passive low push button. Yes __ No ___.

16. Item (15) is the correct way to wire a STOP push button. Yes __ No ___.


----Do not turn in any extra paper with this test. Do not separate pages of this test.------

17. I have read the statement printed just above this question. Yes __ No ___.

18. Item 12’s resistance structure is the view from the power supply in item (22). Yes __ No ___.

19. Item 12 occurs when you look from the load in item (22) Yes __ No ___.

  1. X is the output of item (16).Yes ___ No ___ . 21. X is not the output of item (20) Yes __ No ___.

22. If the pressure sensor in the process described in item (8) goes into alarm a

logic 1 signal will automatically show up at the Q output of the 7474. Yes __ No ___.

  1. The LED in item (11) is seen if 16 milliamps pass through it. What is the is the maximum resistance value permits that amount of current?

24. If the Clear input item (23) is active, the LED is OFF. Yes __ No ___.

25. Item (19) is an open gate. Yes __ No ___. 26. Item (21) is an open gate Yes __ No ___.

  1. Draw (in space below) a TTL based function diagram for an instrument system with an active low pressure sense high sensor and an active high level sense low sensor that will turn a LED off if either of the sensors is active. Clearly show how the LED is wired and include the value of current limiting resistor in the diagram.
  1. If the inputs to item (1) are passive, the LED is ON. Yes __ No ____
  2. Draw (in space below) the function diagram for an instrument system with a Start push button, a Stop push button, an active low pressure sense high sensor and an active high level sense low sensor that will turn a LED off if either of the sensors is active.

  1. The NC relay in item (23) is open if the Set pin is active. Yes __ No ____
  2. The LED in item (23) is open if the Set pin is passive Yes __ No ____
  3. Draw (in the space below) the function diagram for a BEST-Belch Beer bottling process instrument system. The system has to have a Start push button, a Stop push button, an active low pressure sense high sensor and an active high level sense low sensor. The system must turn a LED ON if either of the sensors is active but only after 9 bottles of Belch have been bottled.

33. The motor in item (23) is running when the Set pin is active. Yes __ No ____

34. The NC relay in item (23) is closed when the motor is running. Yes __ No ____

35. If Set and Clear in item (23) are active when TSH goes active, then

the LED will be ON if PSH and FSL are passive. Yes __ No ____

36) Show off and earn zero bonus credit question.

If the 7474 circuit configuration in item (8) replaced the corresponding 7474 circuit

configuration in item (23) what would the answer to question 33 be? Why?

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test 3 Instrument Systems page of 3