115 unit 13-2 review

In a thermistor, ________ varies with changes in __________.

• voltage, amperage

• current, voltage

• resistance temperature

• impedance, frequency

In the ______ transducer, the sensed pressure pushes against a bellows that controls the linear motion of an iron core within a magnetic field, changing its position.

• permanent split

• potentiometric

• capacitance-type

• inductive

Modulating controls are used to ____.

• start motors

• stop motors

• vary the speed of a motor

• stop the flow of a liquid

Pressure transducers operate by converting sensed ______ into a corresponding ______value.

• pressure; temperature

• pressure; electrical output

• movement; pressure

• electrical output; pressure

The Bourdon tube ____.

• straightens out with an increase in voltage

• curls inward with an increase in vapor pressure

• straightens out with an increase in electrical current

• straightens out with an increase in vapor pressure

The __________ is a thin, flexible, metal membrane used to convert pressure changes to movement.

• Bourdon tube

• bimetal strip

• bellows

• diaphragm

The automatic control of a system is intended to ____.

• maintain the working conditions of the equipment with a controllable device

• evaluate overloading situations

• maintain stable or constant conditions without excessive human interference

• maintain safe operations for service technicians

The bimetal strip is the most common device used to sense changes in ____________________.

• temperature

• pressure

• resistance

• power

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

• overload

• capacitor

• mass control

• speed control

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

• copper and brass

• copper and steel

• brass and steel

• brass and aluminum