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HVAC > Chapter 5 Measurement Decices > Flashcards

Chapter 5 Measurement Decices Flashcards

1
Q

The degree to which a measurement confirms to a specific standard

A

Accuracy

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2
Q

The level of accuracy or mechanical exactness

A

Precision

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3
Q

The verification of graduations and incremental values of a precision measuring instrument for accuracy and adjustments

A

Calibration

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4
Q

A semiprecision measuring tool used for measuring length

A

Rule

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5
Q

A hand tool with one fixed and one adjustable jaw used for making precision measurements

A

Caliper

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6
Q

A short auxiliary scale placed along the main scale of an instrument to provide accurate fractional readings

A

Vernier scale

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7
Q

A precision measuring instrument used to take high accuracy inside, outside or depth measurements

A

Micrometer

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8
Q

Measurement of the intensity of heat

A

Temperature

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9
Q

A device used for taking temperature measurements at a single pt. by direct contact

A

Contact temperature probe

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10
Q

A thermal expansion, temperature measuring device consisting of a sealed, narrow-bore glass tube with a bulb at the bottom filled with a liquid

A

Liquid-in-glass Thermometer

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11
Q

Uses a strip consisting of two alloys with different coefficients of thermal expansion that are fused together and formed into a single strip and a pointer mechanism calibrated for temperature reading

A

Bimetallic Thermometer

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12
Q

A device that produces electricity when two different metals that are twisted together are heated

A

Thermocouple

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13
Q

A device that measures infrared energy emitted by a material and displays the temperature as a numerical value

A

Infrared Temperature Meter

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14
Q

A device that detects heat levels from infrared energy emitted without making direct contact and displays the temperature as an image

A

Thermal Imager

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15
Q

A device that consists of two glass thermometers attached to an assembly that permits the two thermometers to be rotated through the air

A

Sling psychrometer

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16
Q

a humidity analyzer that uses two thermometers one with a wet bulb and one dry

A

Psychrometer

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17
Q

a humidity analyzer that measures the physical or electrical changes in various materials

A

Hygrometer

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18
Q

a material that changes its physical size or electrical characteristics as the humidity changes

A

hygroscopic element

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19
Q

an anodized aluminum strip with a porous aluminum oxide layer used as a dielectric

A

capacitance probe

20
Q

a portable electrical device that precisely measures positive, negative or differential pressures in small increments

A

Digital Manometer

21
Q

a mechanical pressure gauge with a curved tube made of thin metal that acts as a pressure-sensing element

A

Bourdon tube pressure gauge

22
Q

a mechanical pressure gauge that has a small single-acting spring return cylinder that acts as a pressure-sensing element

A

Schrader pressure gauge

23
Q

a mechanical pressure gauge consisting of two pressure-tight compartments, a flexible diaphragm, a biasing spring, and a magnetic pointer

A

Magnehelic pressure gauge

24
Q

the speed at which gases, liquids or solids travel through a system

A

Velocity

25
Q

a device that measures average air velocity or average airflow rate

A

Anemometer

26
Q

a device that is placed over a grill or diffuser to measure the rate of airflow

A

Flow Hood

27
Q

used to measure velocity pressures in a duct, by measuring the static and total pressures in the duct

A

Pilot Tube

28
Q

a permanently installed air-handling system device used to measure air velocity in a duct

A

Thermoanemometer

29
Q

a meter that can measure two or more electrical properties and displays the measured properties along calibrated linear and nonlinear scales using a pointer

A

Analog Multimeter

30
Q

a meter that measures two or more electrical properties and displays the measured properties as numerical values

A

Digital Multimeter (DMM)

31
Q

used to measure current and resistance

A

Ohmmeter

32
Q

are produced by the magnetic fields generated by current-carrying conductors, fluorescent lighting, and operating electrical equipment

A

Ghost Voltages

33
Q

a meter that measures the current in a circuit by measuring the strength of the magnetic field around a single conductor

A

Clamp-On Ammeter

34
Q

an instrument that tests for a complete path for current to flow

A

Continuity Tester

35
Q

a meter that detects insulation deterioration by measuring high resistance values under high-voltage test conditions

A

Megohmmeter

36
Q

an instrument that indicates approximate voltage levels and type through the movement and vibration of a pointer on a scale

A

Voltage Tester

37
Q

an instrument that is plugged into a standard receptacle to determine when the receptacle is properly wired and energized

A

Receptacle Tester

38
Q

a special DC voltmeter that detects the presence or absence of a digital signal

A

Digital Logic Probe

39
Q

an instrument used to measure ground resistance for grounding rod installations

A

Ground Resistance Tester

40
Q

a device used to determine phase sequence and open phases

A

Phase sequence Indicator

41
Q

an instrument used to measure the speed of rotation of a shaft or wheel in rpm

A

Tachometer

42
Q

used to pinpoint refrigerant leaks

A

Soap Bubbles

43
Q

a device used to detect the presence of halogen gas

A

Electronic Leak Detector

44
Q

uses UV light to detect fluorescent dye refrigerant leaks

A

Fluorescent Leak Detector

45
Q

detects sounds created by refrigerant leaks

A

Ultrasonic Leak Detector

46
Q

a stationary detector system for one specific type of refrigerant

A

Fixed Leak Detector

HVAC (1 decks)

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