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name (closed notes, narrow vision, open mind) 4 test spring 2008 (The final exam is on ????? at ????? AM in this room.) 1. Draw the function diagram of an active low logic device that will be active when a set of alarm (limit) sensors present the equivalent of 2638 to the inputs of that device. 2 A pnp transistor is saturated when its base is at 0 volts. Yes __or No ___ 3. Minimal current flows through a transistor when it is saturated. Yes __or No ___ 4. How many limit sensors are needed for the function diagram in question 1. _________ 5. STOP buttons are normally closed active low devices. Draw the wiring diagram for a STOP P.B. that will interface to a TTL device. Label all voltage values. 6. Current flows in an LED when its anode is negative. Yes __ or No ___ 7. Current flows in a diode when its cathode is positive. Yes __ or No ___ 8. A diode is forward biased when its cathode is positive. Yes __ or No ___ 9. If a 20 ohm resistor is in series with a set of three parallel 30 ohm resistors the total circuit resistance is _________. 10 A 5 volt battery contains 1 coulomb of charged particles. Yes __ or No ___ 11 Stop push buttons are always active low normally open. Yes __ or No ___ 12.A pressure sense low device must be an active low device. Yes __ or No ___ 13. If a power supply with a Norton current of 3 amperes and Thevinin resistance of 20 ohms is connected to a 40 ohm load, what is the circuit’s Norton resistance. ________ 14. An pnp transistor is saturated when its base is at 0 volts. Yes __or No ____ 15. What is the current through the load in question 13 ______________ 16. An pnp transistor is saturated when its base is at 0 volts. Yes __or No ____ 17. The emitter of a npn transistor is doped with a p-type atom. Yes __or No ____ 18. The emitter of a npn transistor is doped with a n-type atom. Yes __or No ___ 19. A TTL logic device is connected in series with a resistor and a LED. What is the resistance value that limits the current in this circuit to 16 milliamps? __________ 20. A power supply with a Thevinin voltage of 120 volts and a 20 ohm Norton resistance is connected to a 40 ohm load, what is the Thevinin resistance value? __________ 21. What is the voltage drop across the load described in the last question? __________ 22. What is the function diagram for an equivalent Circuit of an NOR device? 23. What is the Department of Defense Symbol for a two input NOR device? 24. When transistors are saturated the current through the collector is 0 amps. Yes __or No ___ 25. Draw the Thevinin circuit described in question 20. test 4 Instrument Systems page 1 of 3 26. Item (12) is part of an asynchronous sequencer. Device U2 is a decoder (1) (2) R 3 R2 R1 R2 V1 (3) (a) R3 R1 Yes____ or No____ (b) (4) (5) Note : DSP = device select Control (step) number pulse Sequence number =x =y CX DSP y-x SY (6) v Out RF =-R LED 1-3 Safety Alarm #1 FCE y-(x+1) y alarm x FCE y-(x+1) DSP y-x (7) VIn vOut = - RF I In S3 S2 S1 S0 C3 C2 C1 C0 7 6 5 4 3 2 1 0 Expected status for the completion of the current sequence step is Enable stored in selected memory location Wr/Rd U6 (10) (11) R1 V e c c Q 3 R2 (12) LED2-3 1 2 A 3 A U7 B 1 B 2 3 B B A=B A X G 5 volts C A=B A Q B U1 Carry 5 volts Q Ck X3 3 status from current sequence step 2-1 LED 2-0 74161 5 volts 1Y0 C0 1Y1 C1 1Y2 C2 1Y3 C3 2Y0 S0 2Y1 S1 2Y2 S2 74139 2Y3 S3 U2a 1E 74139 2B D ______________________ page 2 of 3 0 1 X2 2 1A 1B 2A C 27. There are 4 possible 4 bit patterns that could be presented as the four B inputs of the device labeled U7 in item (5). 28. Which icon on page 3 represents the TTL counter device? _______ 29. Which item number above is the icon for a comparator operational amplifier configuration? 30. Item (7) is a mathematical model for predicting the output voltage for the circuit in item (9). 31. What day and what time is the final exam? X 1 LED Q Q From U7 X 0 Sequence reset P.B. Load R3 test 4 Instrument Systems A 0 2-2 CL + Q2 A 0 To Ck on U1 LED + LED1-0 FCE y-(x+1) (9) V LED1-1 Safety Alarm #1 (8) Q1 LED 1-2 2E U2b Yes____ or No____ __________ Yes____ or No_____ 32. Device U6 in item (5) is a memory chip. The content of two memory locations in U6 are shown below. If the binary pattern that corresponds to AD16 is on outputs D0, D1, D2, and D3, respectively, then the A=B output on device U7 will go active when the binary pattern 1010 is presented to X3, X2, X1, X0, respectively. Yes___ or No____ Address of memory location Content of memory location as base 16 value ED16 AD16 EE 14 33 Examine the cartoon show to the right.; (a) This is a diagram of a pnp transistor. yes___ no___ (b) The base material in this transistor is positively charged. yes ___ no ___ (c) Circle the circuit icon for this cartoon device. (d) Label the parts of the correct circuit icon just above that represents the pnp transistor . Use the circuit components below to help you answer the rest of the questions on this page. (these questions are valued at 10 points each) 34. Draw a control scheme for a motor that when started will run for 9 hours and then stop automatically. It has a Start push button, a Stop push button, and a LED that indicates the motor should be ON. Note: The 555 device provides a steady stream of clock pulses at a rate of 1 clock pulse per hour. 16 3 4 5 6 9 2 + V A Q A B Q 74161 C B Q D C Q load D Power Supply 14 13 12 N.C. 11 motor ck 15 carry 1 clear 7 Enable P 10 Enable T PR 1 Gnd Cl 1 ck + 10 V C1 R1 PR 2 4 8 Cl 7 2 Out Trigger 6 2 ck Discharge 3 VOut 555 7474 Q 1 Q 1 Q 2 Q 2 - 10 V 35. Add a diode to your design above to provide current surge protection for the relay. 36. Add diodes to your design above to clamp the 555 output voltages to 5 V and/or 0V. test 4 Instrument Systems page 3 of 3