RED
The ratio of the output signal to the input signal of an amplifier is called the gain
T/F
True
An Op-Amp has a low impedance output property
T/F
True, an Op amp contains 3 properties,
1-High input impedance 2-High Gain 3-Low output impedance
AND, OR, NOR gates have 2 or more inputs and 1 output
T/F
True, most applications use 2 gates, but are not limited to 2
What does the addition of a small circle that is shown on the right side of a logic gate mean
The small circle means that the normally expected output from the gate will be inverted
A normally open, momentary pushbutton will conduct current until it is pushed.
T/F
False, this type of PB conducts current only when pushed, and only as long as it is pushed. Take you finger off and it will go back to the open state.
The most common type of IC is:
1-zener diode 2-JFET transistor or
3-Op-Amp
Op-Amp is the most common devices that are put on integrated circuit chips (IC's)
What determines the amount of time it takes for a capacitor to charge or discharge 1-Voltage 2-current or 3-value of capacitor and resistor
Th value of the resistor and capacitor is what determines the length of time for a capacitor to charge or to discharge
What is the name of the device that has all transistors, resistors, and other components mounted on it.
Integrated chip or integrated circuit, or IC, or Chip
What is used to describe the behavior of any logic gate??
The truth table is used to describe the operation of any logic gate
An industrial press requires a PB for the left hand and a PB for the right hand to be pushed to start the press. What type of GATE would be used in the controls to start the press??
An AND gate would be used. This would insure that the operators hands are clear of the press. SAFETY!!
Op-amps are used in audio amplifiers, video amplifiers and are used in many industrial control systems T/F
True, there are many different applications for this very common circuit to work in.
The addition of a feedback resistor in an Op-amp circuit between the output and the input will control the gain
T/F
True. An Op-Amp without feedback resistor has enormous gain. Adding the FB resistor will reduce the gain to a controllable value
If both inputs of a NOR gate are 0, what state will the output be??
The output will be a logical 1
If both inputs to a NAND gate are at logic-1, what state will the output be???
The output will be at logic 0
If the value of the resistor in an RC circuit is increased, the Time for the capacitor to charge is increased.
T/F
True, the time to reach the time constant (63% of applied voltage) is calculated by multiplying the resistor value (Ohms) times the capacitor value (farads). Larfger resistor means larger time constant.
An IC chip can be repaired with common soldering tools
T/F
False, IC chips need to be replaced if defective
The most common cause of IC failures is:
1-low voltage 2-improper frequency of input signals 3-overheating
Overheating is the most common cause of IC failures
If either 1 of 2 inputs is at a logic-1, or both at a logic-1, and the output is at logic-1, what kind of gate is used???
The describes an OR gate.
How many transistors can be put on an IC chip??
1-up to 100 2-up to 1000 3-a million or more
Millions or even billions of transistors can be put on a single chip, thanks to new manufacturing techniques.
If both inputs to a 2 input OR gate are at logic-1, what will the output be??
The output will be at logic-1. An OR gate will produce a logic-1 if either or both inputs are logic-1
Which of the following can be used to add voltages
1-PNP Transistor 2-SCR and zener circuit, 3-summing amplifier
A summing amplifier application with an Op-amp is used to add input voltages
What gate would be used to invert an incoming signal
1-AND gate, 2-NOR gate, 3-NOT gated
The correct answer is a NOT gate. It will invert a 1 to a 0, and a 0 to a 1
Describe the operation of an exclusive OR gate
A logic-1 input on either input will produce a logic 1 output, but not if both inputs are at logic 1
Logical gates are circuits that contain multiple electronic components.
T/F
True, Logic gates are circuits that are designed to operate as logic gates.
In a control system that starts and stops any macjinery, the stop PB should always be a normally open signal T/F
False, the input signal to stop any machinery or process should be a normally closed signal (always a 1 until button is pushed, then it becomes a 0). This is failsafe design to protect against a broken wire that would prevent stop signal from being received by the controls.