Mid term test Automation

What does NEMA stand for?

National Electrical Manufacturers Association

What does IEC stand for?

International Electrotechnical Commission

What are some types of switches

Manual operated, mechanical activated, and process activated.

What are some types of manually operated switches

Toggle, pushbutton, selector, disconnect

What are some types of Mechanical activated switches

limit switch

Process activated switches

Flow, pressure, level, temperature, and proximity

What does open, and closed mean for contacts

Open means there is no physical connection to the contact, meaning no electrical flow. Closed means there is a connection to the contact leading to electrical flow

What is pole and throw

Pole refers to the thing that makes contact with the contacts. The throw is the number of positions or connections each pole can connect to.

What is momentary Vs maintained

Momentary is when the switch returns back to it original state after its function is done. Maintained, stays in the actuated until used again.

normally-open (NO) vs. normally-closed (NC)

Normally open starts open so there is no electrical flow until activated. Normally closed starts closed so electricity flows until activated.

What does single break double break mean

Single break means the contact opens at one point in the circuit. Double break means the contact opens at two points in the circuit.

What is the full name of this

SPSTSB-NO

What is the name of this?

SPSTDB-NO

What is the name of this?

SPSTDB-NO

What is the name of this?

SPSTDB-NC

What is the name of this?

SPSTDB

What is the name of these

DPDTDB

What does the NEMA ladder diagram standard look like?

The NEMA standard is a vertical ladder. 24VDC is on the left. Ground is on the right. The first rung at the top of the ladder

What does the IEC ladder diagram standard look like?

It is a horizontal ladder where the 24VDC is at the top rung, the ground is at the bottom, and rungs proceed left to right.

What logic is this

AND

What logic is this

OR

What logic is this

NOT

What is fluid power?

Technology that deals with generation control, and transmission of power using pressurized fluids.

What is the difference between pneumatics and hydraulics

Pneumatics uses compressed air, while hydraulics uses pressurized liquids to transmit power.

What is the objective of fluid power systems

To transmit and control power using pressurized fluids to perform accurate mechanical work.

What laws does fluid power use

Pascal’s law the property of a fluid (gas or liquid) to transmit pressure equally in all directions throughout itself

What are pneumatic valves

They are used to regulate the pressure, air velocity. and flow rate, and to manage the direction of flow.

What is a pressure relief valve

Sets the maximum system pressure within safe working limits

What is flow or speed control valves

They regulate the volume flow of air at a specified working pressure

What is Directional control valves

To stop, start, divert, shuttle, and manage the direction of the air

What is the FULL name of this device?

3/2 control valve, actuated by push button, reset by spring

What is the FULL name of this device

4/2 directional control valve, air actuated, reset by spring

What is Motor control

The process of starting, stopping, protecting, regulating, and reversing electric motors used in industrial, commercial, and residential applications

What is the main objectives for motor control

Safe motor operation, Reliable machine performance, Protection of equipment and personnel, Efficient energy usage, Process automation

What is a contactor

A type of relay designed to switch and control high-power electrical loads beyond standard control relays.

What are some types of motor starters

Manual motor starter, magnetic motor starter, autotransformer starter, soft starter.

What are the specification for PLC

A solid-state device with computer flexibility, designed for industrial environments and easy programming and maintenance.

What is the NEMA definition of a PLC

A digital electronic apparatus with programmable memory for instructions such as logic, sequencing, timing, counting, and arithmetic to control machines and processes.