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3rd Year Study Guide
Two more tests to go!
| Question | Answer |
|---|---|
| The ability of a single logic output to drive a given number of inputs of other logic circuits was defined as the | "Fan Out" (REF: Chapter 7: BUFFER and INVERTER Amplifiers ) |
| In some practical applications, the output of the logic circuit must drive a special application load such as a lamp, relay, or solenoid that requires more current than the module is capable of delivering. To accommodate these special loads, _________________are inserted between the logic output and the load. | Answer:" BUFFERS" Note: The logic BUFFER increases the drive capability by increasing the power output of the circuit without inverting the signal. (REF: Chapter 7: BUFFER and INVERTER Amplifiers |
| Another purpose of the BUFFER is to_______________ one circuit from another by “buffering” the inputs. | Answer: "Isolate" (REF: Chapter 7: BUFFER and INVERTER Amplifiers |
| A BUFFER may be part of the TTL logic module. Under these conditions it is a transistor amplifier with an open collector circuit as the output of the IC. Typically, this circuit can deliver up to ________________mA with a collector voltage up to ______________Volts | 40mA/30 Volts |
| When the output of the AND gate is __________________, the transistor will cut-off. Under this condition the transistor resistance is very ___________________ with VCC dropped across the transistor. | Answer: Low/High (REF: Chapter 7: BUFFER and INVERTER Amplifiers )(Figures DE7-2 and DE7-3....Buffer |
| Circuits in which inversion takes place are called ____________logic circuits. | Answer: "NOT" |
| Because a common-emitter transistor amplifier is used in the output stage, the signal on the base of the transistor and the signal on the collector are 180° out-of-phase with each other. A high output from the AND module results in a low output from the module. A low input at the base results in a high output. TheBUFFER in this case is technically an _____________? | Answer: "Inverter" (REF: Chapter 7: BUFFER and INVERTER Amplifiers ) Figure DE7-4 INVERTER logic symbol used in digital electronics. |
| The standard TTL output current is ________________ . | Answer 16mA (REF: Chapter 7: BUFFER and INVERTER Amplifiers ) |
| If the BUFFER amplifier symbol also has a bubble at the output lead, the bubble indicates that the input signal is inverted, making the amplifier an INVERTER. True/False | Answer: (REF: Chapter 7: BUFFER and INVERTER Amplifiers ) |
| How can VCC(Max) be determined for an open collector output of an IC? | Answer: The maximum voltage can be determined from the data sheet on the IC. (REF: Chapter 7: BUFFER and INVERTER Amplifiers ) |
| An amplifier being used as a BUFFER amplifier has its output signal 180° out-of-phase with its input signal is called a(n) ________________? | Answer: "Inverter" question was asked in a longer form in another question here |
| _________________________ ? is the number of logic circuit inputs that a single logic circuit output can drive. | Answer: "Fan Out" (REF: Chapter 7: BUFFER and INVERTER Amplifiers ) |
| How can one tell from the symbol if an open collector BUFFER amplifier is part of an IC module? | Answer: There will be a diamond shape on the logic symbol. (REF: Chapter 7: BUFFER and INVERTER Amplifiers ) |
| What determines the voltage used for VCC in a typical BUFFER amplifier that is part of an IC module? | Answer: The voltage required by the load determines the value of VCC (REF: Chapter 7: BUFFER and INVERTER Amplifiers ) |
| A bubble either on the input or the output of a logic gate indicates ________________ ? logic. | Answer: "NOT" (REF: Chapter 7: BUFFER and INVERTER Amplifiers ) |
| In NEMA logic, a(n) __________________________ ? is used to show that a gate is inverted. | Answer: "X" (REF: Chapter 7: BUFFER and INVERTER Amplifiers ) |
| It can be stated that a NAND logic gate will have a Low output ONLY when all the inputs are _____________? | Answer: "HIGH" (REF: Chapter 8: NAND Logic) |
| How many inputs can a NAND gate have? | Answer: "Any number of inputs" (REF: Chapter 8: NAND Logic) |
| Regardless of the number of inputs, to raise the NAND gate outputs to their high states, at least ______________ of it's input must be at its low (0) state. | Answer: "ONE" (REF: Chapter 8: NAND Logic) |
| When testing the NAND gate, each input can be shorted to ground one at a time to obtain a _______________________ output. | Answer: "HIGH" (REF: Chapter 8: NAND Logic) |
| Write a Boolean equation for NAND Logic function | Answer: AB=X' (REF: Chapter 8: NAND Logic) |
| The bubble on the NOR symbol indicates that the complement of the OR logic is provided at the output. True False | True (REF: Chapter 9: NOR Logic) |
| What would be the effect on the logic of taking the output from an INVERTER connected after the NAND logic module? | The output would be the complement of the NAND logic and result in AND logic. (REF: Chapter 9: NOR Logic) |
| A NAND gate can be created by inverting the output of an AND gate, but inverting the inputs to an AND gate is not equivalent True False | True The gate will have to be changed to an OR gate with inverted inputs. |
| The output of the XOR gate is HIGH when ? input(s) is/are HIGH. Select one: a. 0 b. 1 c. 2 d. all | Answer: 1 (REF: Chapter 10/11 XOR/XNOR) |
| An XOR gate never has more than ? inputs Select one: a. 1 b. 2 c. 3 d. 4 | Answer: 2 (REF: Chapter 10/11 XOR/XNOR) |
| The symbol ⊕ when it is drawn on a NOR gate symbol indicates that the gate is an XOR. True False | Answer: False (REF: Chapter 10/11 XOR/XNOR) |
| ? devices are used to tell a circuit what to do and when to do it. Select one: a. Notification b. Sensing c. Signaling d. Triggering | Answer: Sensing (REF: Lesson 8) |
| What is the purpose of the bounceless switch? Select one: a. To ignore the following inputs caused by the bouncing of the switch contacts b. To lock the switch output HIGH or LOW c. To respond quickly to the first input from the switch contact closure d. All of the above | Answer: d. All of the above (REF: Lesson 8) |
| Which mathematical functions CANNOT be performed on the ancient abacus? | Performance of cosine and tangent functions |
| The first adding machine was invented by ______________________ in the seventeenth century. | Blaise Pascal |
| ? invented a loom that used digital techniques and punched cards to weave patterns in the cloth. | Joseph Jacquard |
| Many of the principles used in the modern computer can be traced to ? who developed the idea of a mechanical digital computer in the 1830s. | Charles Babbage |
| The Laws of Thought, by ____________________was the first systematic treatment applying a mathematical method to logical thinking. | George Boole |
| Who designed and built the first analog computer? | Vannevar Bush |
| Who developed the first digital computer to use both electrical and mechanical devices? | Howard Aiken note: created Mark 1 the first electro mechanical computer |
| The _______________ was the first electronic digital computer; it was developed at the University of Pennsylvania in 1946. | ENIAC( Electronic Numerical Integrator and Computer) |
| One of the first commercially available computers was the ? , which was introduced in 1951. | UNIVAC 1 ( Designed by University of Pennsylvania) |
| Early electronic computers used _____________________. These devices created heat and caused frequent circuit failures. | Vaccuum Tubes |
| The _________________________ was developed at Bell Laboratories in 1947 and was used as a replacement for the vacuum tube in the computer. | Transistor |
| Which of the following is an advantage of using the transistor developed by Brattain, Bardeen, and Shockley for use in computers as a replacement for the vacuum tube? Select one: a. It resulted in machines that had increased reliability. b. It resulted in machines that were faster. c. It resulted in machines that were more efficient faster. d. It resulted in machines that were smaller in size. e. All of the above | All of the above |
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