review Flashcards
(34 cards)
SEVEN BASIC ELECTRICAL DEVICES
Manually actuated push button switches
Limit switches
Pressure switches
Solenoids
Relays
Timers
Temperature switches
Other devices used in electro pneumatics are
Proximity sensors
Electric counters
A push button is a switch used to close or open an electric control circuit. They are primarily used for starting and stopping of operation of machinery.
Manually actuated push button switches
There are two types classification of Limit switches depending upon method of actuations of contacts.
Limit switches
A _______ is a pneumatic-electric signal converter. Pressure switches are used to sense a change in pressure, and opens or closes an electrical switch when a predetermined pressure is reached.
Pressure switches
Electrically actuated directional control valves form the interface between the two parts of an electro pneumatic control. The most important tasks of electrically actuated DCVs include.
Solenoids
A ______ is an electro magnetically actuated switch. It is a simple electrical device used for signal processing.
Relays
_____ are required in control systems to effect time delay between work operations.
Timers
___________automatically senses a change in temperature and opens or closes an electrical switch when a predetermined temperature is reached.
Temperature switches
There are two types of electronic sensors with regard to the polarity of output voltage.
Positive switching sensors
Negative switching sensors
In this output voltage is zero if no part is detected in the proximity.
Positive switching sensors
In this the supply voltage are applied to the output if no part is detected in the proximity
Negative switching sensors
______ use currents induced by magnetic field to detect the nearby metal objects.
Inductive sensors
_____ are able to detect most materials at distances up to a few centimeters.
Capacitive sensors
Light sensors have been used for almost a century-originally photocells were used for applications such as reading audio tracks on motion pictures.
Optical proximity sensors
_____ use light focused over a given range, and a sensitivity adjustment is used to select a distance.
Diffuse sensors
There are three main high energy rate forming processes:
- Explosive forming,
- Magnetic forming
- Electro-hydraulic forming
Types of production systems
Continuous flow process
Mass Manufacturing of Discrete Products
Batch Production
Job shop Production
Manufactured product is in continuous quantities i.e., the product is not a discrete object.
Continuous flow process
Products are discrete objects and manufactured in large volumes.
Mass Manufacturing of Discrete Products
In a batch production process the product is either discrete or
continuous.
Batch Production
Typically designed for manufacturing small quantities of discrete products, which are custom built, generally according to drawings supplied by customers.
Job shop Production
Types of Automation Systems
Fixed Automation
Programmable Automation
Flexible Automation
Integrated Automation
It is used in high volume production with dedicated equipment, which has a fixed set of operation and designed to be efficient for this set.
Fixed Automation
