Term
| Air normally contains 21% oxygen. |
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Definition
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Term
| Successful maintenance personnel practice lifelong learning. |
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Definition
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Term
| A multimeter is an instrument capable of measuring two or more electrical quantities. |
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Definition
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Term
| Interpersonal skills are strategies and actions that allow an individual to communicate effectively with other persons in a variety of situations. |
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Definition
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Term
| Project work may include rebuilding or modifying equipment. |
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Definition
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Term
| Potential energy is energy in motion. |
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Definition
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Term
| Scheduled maintenance is work that is planned and scheduled for completion. |
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Definition
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Term
| Gas contaminants in the air are typically measured in parts per million (PPM). |
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Definition
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Term
| The severity of electric shock is increased with less resistance. |
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Definition
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Term
| Fuel, heat, and oxygen are required to start and sustain a fire. |
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Definition
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Term
| Stress is the internal effect of an external force applied to a solid material. |
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Definition
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Term
| Pressure is force per unit area. |
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Definition
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Term
| Torque is rotational stress. |
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Definition
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Term
| A btu is the quantity of heat required to raise the temperature of 1 lb. of water one degree F. |
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Definition
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Term
| Class D fires consist of certain combustible metals. |
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Definition
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Term
| Temperature is the measurement of the intensity of heat. |
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Definition
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Term
_______ maintenance is scheduled work required to keep equipment in peak operating condition.
a. preventive c. plant
b. industrial d. none of the above |
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Definition
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Term
Maintenance personel are broadly classified as _____ or multiskilled.
a. specialists c. none of these
b. multitask d. lazy |
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Definition
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Term
_____ order is a document that details specific maintenance tasks to be completed.
a. work c. none of these
b. direct d. written |
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Definition
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Term
An air contaminant is an undesirable element in the air such as ____.
a. gas c. all of these
b. fumes d. dust |
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Definition
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Term
| Three-phase circuits do not always require a neutral wire. |
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Definition
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Term
| The larger the AWG number, the larger the diameter of the wire. |
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Definition
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Term
| In a step-up transformer, the secondary coil has more turns of wire than the primary coil. |
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Definition
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Term
| All lamp ballasts produce some noise. |
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Definition
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Term
| Overheating is the most common cause of motor failure. |
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Definition
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Term
| In three-phase AC voltage, the coils are out-of-pase with each other. |
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Definition
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Term
| Most industrial electrical circuits are parallel circuits. |
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Definition
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Term
| Larger emergency generators are usually powered by diesel engines. |
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Definition
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Term
A ____ is a subatomic particle that has a postive charge of one unit.
a. proton c. electron
b. neutron d. all of the above |
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Definition
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Term
Current is measured in ____ .
a. volts c. ohms
b. amperes d. none of the above |
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Definition
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Term
A Is an OCPD with a fusible link that melts and opens the circuit when an overload condition or short circuit occurs.
a. CB c. Switch
b. fuse. d. none of the above |
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Definition
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Term
Contacts fail when they _____.
a. do not close c. offer reststance to current flow
b. do not open d. all of the above |
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Definition
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Term
An _____ is a subatomic particle that has a negative electrical charge of one unit.
a. proton c. electron
b. neutron d. all of the above |
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Definition
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Term
A ____ is a piece of equipment in which incoming electrical power is broken down into smaller units for distribution throughout a building.
a. disconnect c. lighting panel
b. switchboard d. none of the above |
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Definition
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Term
____ is the discharge of an electric current across a gap.
a. Stabbing c. Arcing
b. Pitting d. Tracing |
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Definition
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Term
Group relamping is the replacement of all lamps in a given area when they reach ____ % of their rated life.
a. 50-70 c. 80-90
b. 60-80 d. 90-99 |
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Definition
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Term
The phases in a three-phase system are commonly labeled ____ and are energized in sequence.
a. 1, 2, and 3 c. X, Y, and Z
b. A, B, and C d. none of the above |
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Definition
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Term
A ____ switch ia a switch that is operated by movement of an object.
a. manual c. automatic
b. mechanical d. none of the above |
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Definition
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Term
A circuit draws 1160 mA; this equals ____ Amps.
a. 1160 c. 11.60
b. 1.160 d. 116.0 |
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Definition
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Term
A resistance of 4 MΩ equals ____ kΩ.
a. 4 c. 400
b. 40 d. 4000 |
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Definition
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Term
| Refrigeration systems are designated to maintain a specific temperature rather than a range of temperatures. |
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Definition
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Term
| Heat flows only from a warmer temperature to a cooler temperature. |
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Definition
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Term
| Heat pumps are classified as air-to-air, water-to-water, or air-to-water. |
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Definition
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Term
| Charging is adding refrigerant to a system. |
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Definition
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Term
| All substancesexist in either a solid, liquid, or gaseous state. |
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Definition
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Term
| High-pressure refrigerant can freeze the eyes and skin. |
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Definition
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Term
| A micron is a unit of measure equal to one-millionth of an inch. |
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Definition
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Term
| An electronic leak detector may give an audible tone or visual signal when the detector senses refrigerant. |
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Definition
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Term
| Liquids cannot be compressed. |
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Definition
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Term
A ____ is a chemical substance that vaporizes (boils) at a low temperature.
a. refrigerant c. water
b. gasoline d. none of the above
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Definition
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Term
_____ heat is heat energy that can be measured by change in temperature.
a. Sensible c. Convection
b. Radiant d. Latent |
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Definition
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Term
A _____ is a heat exchanger through which heat is transferred to the low-pressure refrigerant liquid.
a. compressor c. evaporator
b. condenser d. none of the above |
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Definition
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Term
A ____ pump is a mechanical compression refrigeration system that can reverse the flow of refrigerant, switching between heating and cooling modes.
a. water pump c. fuel pump
b. air pump d. heat pump |
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Definition
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Term
_____ condensers are the most common condensers used in refrigeration systems.
a. Air-cooled c. Evaporative
b. Water-cooled d. none of the above |
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Definition
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Term
The ____ is the difference between the cut-out pressure of a compressor.
a. locked up compressor c. setpoint
b. differential d. control point |
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Definition
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Term
A _____ device is a component that controls the flow rate of refrigerant into an evaporator.
a. contactor c. low pressure switch
b. metering d. compressor |
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Definition
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Term
An ____ is a heat exchanger that removes heat from high-pressure refrigerant vapor.
a. evaporator c. condensor
b. oil seperator d. suction valve |
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Definition
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Term
A ____ compressor ia a compressor that is completely sealed inside a welded case.
a. heritable c. hermatic
b. hemic d. none of the above |
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Definition
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Term
Refrigerant ____ is the process of removing refrigerant from a system and capturing it in a recovery cylinder, with no cleaning of the refrigerant.
a. recovery c. reclaiming
b. recycling d. all of the above |
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Definition
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Term
A deep vacuum for refrigerant evacuation ia a vacuum between ____.
a. 4 um and 70 um c. 400 um and 700 um
b. 40 um and 700 um d. none of the above |
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Definition
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Term
| HVAC air handler systems can be either constant volume or variable volume. |
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Definition
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Term
| A closed-loop control system is a control system in which components are not affected by their own actions. |
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Definition
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Term
| Air pressure does not vary inside a building. |
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Definition
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Term
| The two most common variables for determining fan size are capacity and static pressure. |
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Definition
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Term
| Static pressure is the pressure exerted by airflow in a direction perpendicular to flow. |
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Definition
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Term
| The "too hot/too cold call" is the most common HVAC system complaint encountered. |
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Definition
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Term
| Most HVAC systems are open-loop systems. |
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Definition
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Term
| The efficiency of a filter is rated by the size of paticles it can trap. |
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Definition
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Term
A pneumatic ____ is a device that uses air pressure to position HVAC components.
a. thermostat c. switch
b. operator d. none of the above |
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Definition
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Term
HVAC systems may contain ____.
a. heating elements c. air handlers
b. refrigeration systems d. all of the above |
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Definition
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Term
Poorly ____ HVAC systems and equipment can contribute to IAQ problems.
a. designed c. maintained
b. installed d. all of the above |
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Definition
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Term
____ cycling is the increase in the frequency of system operation due to improper feedback.
a. Temporary c. Sporadic
b. Intermittent d. Short |
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Definition
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Term
An _____ system is a system used to condition air maintaining proper temperature, humidity, and air quality.
a. electrical c. HVAC
b. hydraulic d. hydronic
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Definition
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Term
An air ____ is a device used to distribute conditioned air to building spaces for comfort.
a. compressor c. bleeder
b. sprayer d. handler |
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Definition
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Term
____ air is the mixture of outside air and return air that is conditioned by heating and cooling coils, that is discharged by the air handler, to blow out the air vents.
a. supply c. exhaust
b. negative air pressure d. wet |
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Definition
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Term
A ____ is a device that measures the difference in pressure between two locations;
Example pressure drop across air filters.
a. manometer c. neither a or b
b. magnahelic guage d. both a & b |
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Definition
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Term
A ____ control system is a system that uses compressed air signal to open or close dampers or valves from a thermostat or controller.
a. electric c. pneumatic
b. old-matic d. hydro-matic |
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Definition
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Term
A ____ box is a terminal unit that varies the amount of air flowing into a zone from an air handler.
a. mix air c. ice
b. VAV d. cardboard |
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Definition
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Term
____ is a condition that occurs when people cannot sense a difference between themselves and the surrounding air.
a. La La Land c. Comfort
b. Humidity d. Perfect world |
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Definition
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Term
A ____ is a movable plate that controls air flow in a duct.
a. valve c. paper plate
b. your mothers china d. damper |
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Definition
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Term
| Any two gear that mesh rotate in opposite directions. |
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Definition
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Term
| Abrasive wear is wear that occurs when a hard surface rubs against a softer surface. |
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Definition
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Term
| The grease dropping point is the temperature at which the thickening agent of a grease turns to a liquid. |
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Definition
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Term
| Pullers may be mechanically or hydraulically operated. |
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Definition
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Term
| Heating a bearing increases the size of the bearing, allowing it to slip over a shaft. |
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Definition
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Term
The gear diameter determines the ____ of teeth on a gear.
a. number c. size
b. type d. none of the above |
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Definition
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Term
A cam ____ is a machine part that contacts the cam and moves in a designated path.
a. ear c. tracer
b. lobe d. follower |
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Definition
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Term
Pullers are sized by ____.
a. pressure c. reach
b. spread d. all of the above |
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Definition
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Term
An ____ bearing is a bearing that contains moving elements, which provide a low-friction support surface for rotating on sliding surfaces.
a. friction c. wear
b. antifriction d. antiwaer |
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Definition
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Term
A belt drive is a ____ drive system that uses a belt and pulley to tranfer power between two surfaces.
a. electronic c. mechanical
b. pneumatic d. all of the above |
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Definition
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Term
A ____ coupling is a device that joins two shafts that are precisely aligned within a common frame.
a. rigid c. chain
b. flexible d. elastometric |
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Definition
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Term
____ belts are the most frequently used for belt drive system.
a. V c. A
b. B d. Serpentine |
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Definition
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Term
A ____ is a substance that separates moving bearing surfaces to reduce the friction and wear between them.
a. bushing c. plastic sleeve
b. lubricant d. race |
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Definition
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Term
A ____ is a device used to remove gears, pulleys, sprockets, bearing, and couplings from shaft or housing.
a. hammer c. vise
b. chisel d. puller |
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Definition
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Term
A ____ is a flexible loop that connects two or more pulleys for transfering rotational power.
a. rope c. belt
b. chain d. hose
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Definition
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Term
A ____ is a device used to connect a mechanical drive to a prime mover.
a. keyway c. pump
b. shaft d. coupling |
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Definition
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Term
An oil ____ is a device used to contain oil insinde a housing.
a. filter c. pump
b. seal d. strainer |
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Definition
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Term
Power belt tension should result in approximately ____ inch of belt deflection for every inch of span between pulley centers.
a. 1/64 c. 1/2
b. 1/1000 d. 1/32 |
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Definition
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Term
____ is the combination of metal and oxygen into metal oxides.
a. Oxidation c. Sil-flos
b. Pot metal d. Cryptanite |
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Definition
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Term
A ____ is a sealed container that has an input shaft and houses at least one set of mating gears.
a. hermetic compressor c. gearbox
b. motor d. pump |
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Definition
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