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68 Cards in this Set
- Front
- Back
Do you need labor charge for a job is $45 in parks amount 1750 with a sales tax for the 7.25% what is the total for the job ticket
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Sixty three dollars and 77 cents
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The Apprentice registration is good for
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One year
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Determine Mechanical Code standard used in Oklahoma is the
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2009 International mechanical
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Do you like to know at requires that each employee inform employees about hazardous materials, this information may be found in
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Material safety data sheet
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type 1 refrigerant certification allows the repairman to work on
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Small appliances
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The flow of which free particles causes electric current flow
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Electrons
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What is the source of voltage that operates a potential relay
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Back EMF
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if a 240 watt lamp draws amps at 120volts, what is its resistance
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60 ohms
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When using a VOA meter connected across the load, what will the meter read with power applied
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Voltage
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All of the current passes through each load in circuits which are wired in
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Series
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The principle of creating a voltage in a coil due to a changing magnetic field is called
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Inductance
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What diagram is used to physically locate the components in a system
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Pictorial
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How many amps can a 40 VA transformer operating a 24 volts to carry
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1. 66
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0 ohm reading across contacts indicates close,what does an intermediate reading across contacts indicate
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Burned contacts
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A step-down transformer has a primary of 1000 wraps and a secondary of 250 wraps. What is the turn ratio
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4:1
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The start winding on an electric motor has
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Greater resistance Than the run winding
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In a multi speed motor the run capacitor is wired in series with
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Start winding
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Internal motor protection is provided by a
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Thermally activated device in the motor windings on
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The frequency of alternation current used in the United States is
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60 Hertz
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When replacing an outdoor fan motor, it is recommended that the following component also being replaced
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Run capacitor
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What instrument is used to check the alignment of two pulleys
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Straight edge
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When troubleshooting a positive temperature coefficient (ptc) relay, with the relay cool a good PTC relay will
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Show continuity on an ohm meter
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3 phase motors have
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No star windings r capacitor
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Two types of fans are the propeller and
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Forward curve centrifugal
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When a thermostat has RC and RH come you should install a jumper wire from.
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RC to RH
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As the length of gas pipe increases the pressure drop
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Increases
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What is the purpose of purging with dry nitrogen while brazing
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alleviate oxidation
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Steel pipe fitting which consist of female threads at each end for connecting two pieces of pipe of the same outside diameter is a
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Coupling
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Before applying cement to a cpvc joint ,you should apply
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Primer
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The maximum horizontal spacing between supports specified in the IMC for PVC pipe in
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4 feet
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When the drain heater in a low temperature system is functioning properly condensate collected in the drain pan will
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Evaporate
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If condensate from the inside of the low temperature box freezes in the drain pan the installer may need to install a
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Heater
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In gas piping, the point of delivery is the outlet of the
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Service meter assembly
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What 2 major gas fittings or components must be install outside the furnace cabinet
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Cutoff valve and union
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Black iron is used for what types of lines
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Natural gas
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To join PVC pipe to PVC pipe requires cleaning and
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Cementing
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Were part of a natural gas piping system is to be closed, it first must be tested by filling with
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Air or inert gas
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If a natural gas piping system fails a pressure test, you should pressurize the system and check for leaks with
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Soap and water
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Domestic clothes dryer ducc shall not exceed maximum length of
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25ft
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An early distribution system consists of a
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Fan blower, supply and return ducts
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A type B gas vent is
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Double walled
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Stove pipe and chimney fire may result from
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creosote buildup
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Latent heat involves
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Change of state
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Which of the following refrigerants does not contain chlorine
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R - 134A
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What is the evaporation temperature of r22 and 69 psig
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40 degrees Fahrenheit
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All of the following could be used to measure vacuum except
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Psychomotor
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What is the minimum acceptable level of evacuation for field installation of an AC system
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1000 microns
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When the heat loss of a structure equals the capacity output of the system
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The balance. Has been reached
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The difference between the condensing temperature of the refrigerator and the liquid line temperature is
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Subcooling
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The reason a heat pump must have a complete charge of refrigerant in it before the reversing valve may operate correctly is that if it's low on refrigerant
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The system will have an insufficient pressure to move the main valve
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What component should be energized 24 to 36 hours prior to start up the AC system
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Crankcase heater
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One common indication of the location of refrigerant leak is
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oil on refrigerant components
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Which of the following types of refrigerant systems could operate in a vacuum
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Low temperature
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Which component protects the compressor from liquid refrigerant
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Accumulator
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What happens to the TXV valve operation when the power element loses its charge
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The valve opens
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When pumping down a refrigeration system that has a liquid receiver which valve should you front seat
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King valve
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The difference between the cut in and cut out setting of a high or low pressure control is called the
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Differential
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All of the following could be used to locate a refrigerant leak except
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a hydrogen leak detector
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What category of equipment will type 2 allow you to work on
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High pressure appliances
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A motor burnout will make it necessary to install a suction line filter drier into the compressor to protected from contamination in
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Acid
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What load calculation procedure is used to arrive at the size of the residential heating system
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Manual J
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Temperature rise of a gas furnace is the combination of
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Input and airflow
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When measuring LP gas pressure on a furnace, what is the normal operating pressure
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11.5 in. W.c
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The high limit control on a gas furnace
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Shut the furnace down when the temperature in the furnace or flue becomes excessive
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Turning the gas pressure regulator adjustsment screw counter-clockwise will
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Decrease input
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A direct spark ignition (DSi) system is designed to
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Providing ignition for the main Burners
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Cracks in heat exchangers are caused by
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Expansion and contraction
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What component must be cycled off in the defrost mode
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Outdoor fan motor
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