Exam 13: Introduction to Automatic Controls

What is the major advantage of a remote bulb control?

A thermal system overload may occur if a specific electrical or mechanical component is not cooled properly, resulting in ____.

A thermistor is a device that produces a voltage across the hot and cold junctions when heated.

A common application for the rod and tube type of control is in a(n) ____________________-mounted limit control.

Define a diaphragm used in controls.

Devices, such as thermostats, that open and close their contacts during the ____ operation of the system are referred to as operational controls .

The automatic control of a system is intended to ____.

When a control is required to control space or product temperature, it is called a ____.

An example of a bimetal device is a ____.

To make a bimetal element operate over a wide temperature range, what is done to the element?

The Bourdon tube ____.

The most common device used to sense change in temperature is called a(n) ____________________.

The compressor in the refrigerator has a protective device that keeps it from overloading and damaging itself. This device is called a(n)  ____.

Define "bimetal strip."

The metals most often used in a bimetal temperature control are  ____.

A thermocouple is a device that ____.

Why are two different metals used to produce movement in bimetal elements?

What is a thermopile?

A properly operating thermocouple connected to a solenoid in a gas valve should put out 20 to 30 millivolts.