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Term 3 - Review Tests > Re-Fresher #3 > Flashcards

Re-Fresher #3 Flashcards

1
Q

Which of the following tools has a six pointed star-shaped head?

a) philips
b) nut driver
c) spade bit
d) torx driver

A

d

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2
Q

Which tool is used to loosen or gather a mechanical fitting on a refrigeration or air conditioning system?

a) flare nut wrench
b) pipe wrench
c) adjustable wrench
d) service wrench

A

a

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3
Q

Which is the correct tool to use when manipulating access valves on a refrigeration or air conditioning system?

a) adjustable wrench
b) tongue and groove pliers
c) torque wrench
d) service wrench

A

d

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4
Q

Which of the following is Canadian conventional standard temp scale?

a) celsius
b) Fahrenheit
c) kelvin
d) rankine

A

a

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5
Q

Which part of the system stores refrigerant until it is needed in the evaporator?

a) accumulator
b) surge drum
c) receiver
d) heat exchanger

A

C

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6
Q

A room thermostat should be mounted

a) four feet from the floor
b) near a supply
c) on an outside wall
d) near a return grill

A

d

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7
Q

Which of the following is an HFC?

a) R-12
b) R-22
c) R-123a
d) R-134a

A

d

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8
Q

Which of the following is considered a non-positive displacement compressor?

a) reciprocating
b) rotary
c) screw
d) centrifugal

A

d

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9
Q

Where in the system is the excess superheat added that must be removed before condensation in the condenser takes place?

a) start of evap and end of receiver
b) end of receiver and start of Txv
c) start of evap and in comp
d) end of evap and in comp

A

d

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10
Q

When using a water cooled condenser, a decrease in water

a) decreases power consumption of compressor
b) increases the fouling water factor
c) decreases operating pressures
d) always uses a TXV metering device

A

d

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11
Q

What is the definition of flash gas?

a) rapid condensation of a freon gas
b) rapid evaporation of liquid freon
c) rapid sublimation of liquid freon
d) rapid evaporation of a freon gas

A

b

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12
Q

How will back seating a two-position service valve effect a system?

a) allow normal operation and obtain gauge readings
b) pump system down
c) blocks gauge port
d) none of the above

A

c

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13
Q

When testing for a leak in an air conditioning system?

a) must be pressurized an electrically off
b) full operation besides con fan
c) full operation except blower
d) only comp energized

A

a

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14
Q

The term recovery means

a) to remove and store refrigerant from an appliance
b) remove and clean refrigerant from appliance
c) remove, clean, and store refrigerant from an appliance
d) catch refrigerant in air as it is being released

A

a

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15
Q

A copper joint must never be soldered or brazed?

a) when nitrogen is present in tubing
b) when system is opened to atmosphere
c) when system is under pressure
d) when air is present in the system

A

c

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16
Q

How often should the oil in a vacuum pump be replaced?

a) after every evacuation
b) after every other evac
c) after it can not evacuate down to 500 microns
d) 10hrs operation

A

C

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17
Q

What type of air conditioning system must be charged using the superheat method?

a) a TXV system
b) An AXV system
c) piston type metering device system
d) pitot tube system

A

c

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18
Q

What control is commonly used to initiate a defrost cycle on a pressure operated defrost system?

a) low pressure control
b) high pressure control
c) reverse acting pressure control
d) temperature pressure control

A

a

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19
Q

What is the heating value of natural gas

a) 800btu/cutft
b) 1000btu/cuft
c) 1500btu/cuft
d) 2500btu/cuft

A

b

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20
Q

On a reversing valve, what is connected to the top tube?

a) compressor discharge line
b) indoor coil
c) compressor suction
d) outdoor coil

A

a)

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21
Q

When a conductor is moved through a magnetic field,

a) magnetism is increased
b) reactance is decreased
c) power supply is induced
d) frequency is reduced

A

c

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22
Q

What flows between two ends of a magnet?

a) current
b) voltage
c) electrical charges
d) lines of force

A

d

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23
Q

The three components needed in an electrical circuit are the

a) path, volts, and power
b) current, path, and load
c) power source, path and load
d) switch, power source, and load

A

c

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24
Q

What is the relationship between current and voltage in a capacitive circuit?

a) voltage leads current
b) current leads voltage
c) voltage is in phase with current
d) there is no relationship

A

b

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25
Q

A step down transformer will reduce the voltage to a common low voltage residential application of

a) 240v, single phase
b) 240v, three phase
c) 480v, single phase
d) 480v, three phase

A

a

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26
Q

RPM formula?

A

Hz x 120/ #poles

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27
Q

What is used to sense temperature in electronic temperature controls

a) resistors
b) transistors
c) capacitors
d) thermistors

A

d

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28
Q

What solid state component decreases its resistance as its temperature increases

a) an anode
b) a PTC thermistor
c) a cathode
d) a NTC thermistor

A

d

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29
Q

On a forced air furnace, what loads are 120v

a) blower, INDM, trsfrm secondary
b) INDM, gas valve, blower
c) air cleaner, inducer relay, humid
d) INDM, blower, trsfrm primary

A

d

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30
Q

When measuring voltage on a load, the voltmeter must

a) always be in series with the load
b) always be in parallel with the load
c) be in line with the switch controlling the load
d) be used with the load disconnected

A

b

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31
Q

When testing an electrical circuit that is inoperable, what is commonly the first test that is performed?

a) amperage test
b) resistance test
c) voltage test
d) power test

A

c

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32
Q

A pitot tube has the capacity to measure

a) static pressure
b) velocity pressure
c) velocity and static pressure
d) CFM

A

c

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33
Q

As the air volume is decreased over a fan the motor amperage will

a) increase
b) decrease
c) stay the same
d) air volume cannot be changed

A

b

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34
Q

Where should air filters be placed in an HVAC system?

a) return upstream of coil
b) return downstream of coil
c) supply air upstream coil
d) supply air downstream coil

A

a

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35
Q

What is the average recommended relative humidity for a home during the winter months?

a) 10%-20%
b) 35%-45%
c) 65%-75%

A

b

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36
Q

Complete air conditioning means to

a) cool air within a space
b) dehumidify air within a space
c) cool and dehumidify air within a space
d) heat, humidify, cool, dehumidify, filter

A

d

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37
Q

What type of air filter would remove tobacco smoke particles well?

a) disposable filter
b) electronic filter
c) pleated filter
d) carbon filter

A

d

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38
Q

A safety harness should be used when working on objects more than

a) 4 feet above ground
b) 10 feet above ground
c) 6 feet above ground
d) 12 feet above ground

A

b

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39
Q

What two types of injuries can CFC, HCFC, and HFC refrigerants cause?

a) lung cancer and heart attacks
b) heart attacks and frost bite
c) carbon monoxide poisoning and frost bite
d) frost bite and suffocation

A

d

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40
Q

What is the proper source of ignition for an Coy/Acetylene torch

a) match
b) lighter
c) stryker
d) another torch

A

c

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41
Q

When servicing large air conditioning equipment a tech should

a) ask for help
b) check superheat
c) place a LOTO on disconnect
d) inform customer of the equipment electrical and mechanical detail

A

c

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42
Q

What tool is used to clean burrs from pipe?

a) reamer
b) a die
c) tube cutter
d) countersink

A

a

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43
Q

To convert fahrenheit to rankine

a) subtract 273
b) add 273
c) subtract 460
d) add 460

A

d

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44
Q

Split system has the comp and condenser connected by refrigeration linseed to the metering device and evaporator. T or F?

A

T

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45
Q

R terminal on thermostat?

a) power from transformer
b) blower relay coil
c) cooling contactor coil
d) heating control circuit

A

a

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46
Q

Refrigerant that is being used to replace R22 is?

a) R-408A
b) R-409A
c) R-410A
d) R-507A

A

c

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47
Q

Hydroscopic oil

a) high attraction to moisture
b) should be stored at ambient
c) can be left open to atmosphere
d) low attraction to moisture

A

a

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48
Q

Name two types of compressor lubrication systems?

a) forced and gravity feed lubrication
b) forced and splash lubrication
c) gravity and splashed lubrication
d) plate and gravity feed lubrication

A

b

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49
Q

If air is trapped inside a condenser coil, what symptoms will be present?

a) high disch, low amps, dec eff
b) low disch, high amp, exc heat
c) dec eff, dec heat, high Mps
d) inc heat, high amp, high disch

A

d

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50
Q

What two factors affect efficiency of a water cooled condenser

a) high side pressure to cond and inlet water temp
b) high side pressure to cond and outlet water temp
c) quantity of water and TD between freon and water
d) quantity of water and freon condensing point compared to water boiling point

A

c

51
Q

When is a P trap installed?

a) when evap coil is after heatX
b) when evap is A type coil
c) when evap is H type coil
d) when evap is located on negative side of blower

A

d

52
Q

External equalizer should be located

a) net to TXV sensing bulb
b) 6-8 inches upstream from bulb
c) 6-8 inches downstream of bulb
d) none of the above

A

c

53
Q

When using a three position suction line service valve, when is the front seated position used?

a) when manifold gauges are disconnected
b) under normal operation
c) when system is pumped down
d) when setting the system pressure switch

A

d

54
Q

What must be used when pressure testing a system with nitrogen?

a) vacuum pump and charging cylinder
b) recovery system
c) press reg and in line releif
d) no accesorios needed

A

c

55
Q

Under normal conditions a recovery cylinder must not be filled to more than

a) 60%
b) 70%
c) 80%
d) 90%

A

c

56
Q

Leaks in coils made from aluminum are commonly repaired with

a) silver solder
b) silver brazing material
c) brass brazing material
d) epoxy

A

d?

57
Q

A manifold gauge set is used to check operating pressures in

a) PSIA
b) PSIG
c) inches of mercury
d) PSIG and inches WC

A

b

58
Q

A minimum evacuation level for an air con system is?

a) 5000 microns
b) 1000 microns
c) 500 microns
d) 100 microns

A

c

59
Q

When charging an air con system using the SH method, what factors must be known?

a) in WB and out DB
b) in DB and out WB
c) in Db and out RH
d) in WB and out RH

A

a

60
Q

During an electric, hot gas, or water defrost, what load must be de-energized?

a) compressor
b) defrost timer
c) evaporator fan
d) water reg valve

A

c

61
Q

What are the three methods of heat transfer?

a) evaporation, radiation, convection
b) convection, air motion, conduction
c) conduction, convection, radiation
d) condensation, convection, conduction

A

c

62
Q

Why are the auxiliary strip heaters energized during the defrost cycle?

a) add extra heat load to indoor coil
b) increase pressure to system
c) increase air supply temp for comfort
d) the aux heaters are not energized during defrost cycle

A

c

63
Q

The symbol for electrical pressure is

a) E
b) I
c) R
d) P

A

a

64
Q

What component uses magnetism for operation?

a) pressure control
b) electrical heating equipment
c) motor
d) thermal overload protector

A

c

65
Q

In a series circuit that is using an electrical heater as the load, what would cause an increase in circuit current?

a) decrease in resistance
b) increase in resistance
c) decrease in voltage
d) burnt contact

A

a

66
Q

On a 120v, 60hz supply, what leg must be fused?

a) hot leg
b) neutral phase
c) the hot and neutral leg
d) a fuse is not needed

A

a

67
Q

When measuring voltage using a voltmeter, across any two hot legs of a low voltage WYE transformer should read

a) 120v
b) 240v
c) 208v
d) 460v

A

c

68
Q

The contacts of a potential start relay are

a) wired in series with the run winding
b) wired in series with the start winding
c) always normally opened
d) never normally opened

A

b

69
Q

When adjusting the heat anticipator on a thermostat

a) heat and cool control amperage must be measured
b) heat and cooling control voltage must be measured
c) cooling control amperage must be measured
d) heating control amperage must be measured

A

d

70
Q

What meter must never be used if testing a circuit board

a) an ammeter
b) voltmeter
c) ohmmeter
d) an oscilloscope

A

c

71
Q

What is the proper method for connecting any electrical wires located in a junction box?

a) twisting together and connecting with a wire nut
b) twisting together and connecting with electrical tape
c) soldering together and covering with tape
d) wires must never be connected together in a box

A

a

72
Q

When testing for voltage across a switch located in a 120v circuit, what reading is obtained if the switch was in the closed position?

a) 0 volts
b) 60 volts
c) 120 volts
d) 240 volts

A

a

73
Q

When a relay for a contractor coil is energized, what type of reading should be obtained across a normally closed set of contacts that are in an operating circuit?

a) source voltage
b) circuit amperage
c) 0 ohms
d) 0 volts

A

a

74
Q

What is considered static pressure in a duct system?

a) speed of air in duct system,
b) pressure of air flowing down the duct system
c) pressure of air pushing equally in all directions
d) total pressure in duct system,

A

c

75
Q

How are condenser fan motors cycled during low ambient conditions?

a) by use of high ambient pressure switch
b) by use of low pressure switch
c) by use of a high pressure switch
d) by use of reverse acting high pressure switch

A

b

76
Q

What aids in air distribution system evenly distributing air across a filter media?

a) accordion type air filter
b) non adjustable damper
c) turning vanes
d) adjustable damper

A

c

77
Q

A sling psychrometer is used to determine

a) absolute humidity of air
b) RH of air
c) dew point temperature of air
d) apparatus dew point temperature

A

b

78
Q

CO is a poisonous gas that is produced

a) during complete combustion of gas
b) during incomplete combustion of fossil fuels
c) during burning of fuels, it is a product of combustion
d) all of the above

A

d?

79
Q

When using an extension ladder, you should

a) keep a three point contact
b) extend ladder all the way
c) extend only half way
d) always get help extending the ladder

A

a

80
Q

Acidic oil from compressors is harmful because

a) it causes skin burns
b) contains oil
c) contains oil and refrigerant
d) contains refrigerant properties

A

a

81
Q

When replacing a fuse on an Hvac system

a) it is safe to use a fuse that is lower than system nameplate
b) safe to use a fuse that is higher than system nameplate
c) use a time delayed fuse that is equal to system nameplate
d) use a fast acting fuse that is equal to system nameplate

A

c

82
Q

The Montreal protocol is

a) a treaty regulating production of CFC’s
b) waste of time
c) method of measuring refrigerant CFC’s
d) method of measuring CFC’s in the stratosphere

A

a

83
Q

Corrosion will start to form inside the air conditioning system if the moisture content exceeds

a) 10PPM
b) 100PPM
c) 200PPM
d) 250PPM

A

b

84
Q

How is compression ratio determined?

a) discharge psia / suction psia
b) suction psia / discharge psia
c) discharge psig / suction psig
d) suction psig / discharge psig

A

a

85
Q

What two pressures control a water regulating valve?

a) outlet water pressure and high side press
b) spring pressure and inlet water press
c) crankcase press and high side press
d) high side press and spring press

A

d

86
Q

What is the purpose of the distributor?

a) feeds freon to the compressor from evap
b) feeds freon to the evap coil
c) feeds freon to condenser coil
d) feeds freon to solenoid valve

A

b

87
Q

What is the formula for calculating superheat?

a) suction line temp and evap boiling point temp
b) liquid line temp and evap boiling point temp
c) suction line temp and evap boiling point temp
d) liquid line temp and evap boiling point temp

A

c

88
Q

Where is the queen valve located?

a) outlet of compressor
b) inlet of compressor
c) outlet of receiver
d) inlet of receiver

A

d

89
Q

What is the purpose for purging an air conditioning system with anhydrous gas while brazing?

a) keep moisture out of system
b) prevent oxidization
c) draw heat from the brazed joint
d) to aid chemical reaction of the brazing compound

A

b

90
Q

What can cause a decrease in suction pressure on an air conditioning system?

a) dirty condenser coil
b) too large of a TXV
c) dirty evap coil
d) re-circulated air over condenser

A

c

91
Q

After evacuating a system, the manifold gauges are closed, then the vacuum pump is turned off. Using a micron gauge, system is drawn down to 500 microns, the system is left off and the pressure rises slightly then stops. What is the problem?

a) gauges are leaking
b) moisture in system
c) expansion of oil
d) system leak

A

b

92
Q

when a termination thermostat is used with a time initiated temperature terminated defrost system, what is commonly used to override the timer motor?

a) pressure control
b) holding relay
c) timer release solenoid
d) override relay

A

c

93
Q

When sizing a heat pump, it should initially be sized for

a) heating load
b) cooling load
c) heating and cooling load
d) total capacity

A

b

94
Q

One watt is equivalent to

a) 3.412 btu
b) 3412 btu
c) 746 btu
d) 3.142btu

A

a)

95
Q

When two 20ohm resistors are connected in parallel and source voltage is 240v, what is the total amperage of the circuit

a) 12amps
b) 24amps
c) 3amps
d) 10amps

A

b?

96
Q

If the current of an AC circuit changes direction 100 times in one second, the frequency of the power source would be

a) 100hz
b) 200hz
c) 60hz
d) 50hz

A

d

97
Q

On a single phase motor, where would one find the lowest resistance?

a) run to common
b) start to common
c) run to start
d) T1-T2

A

a

98
Q

When wiring two 30uf run capacitors in parallel what is the microfarad rating on the complete circuit?

a) 60uf
b) 15uf
c) 90uf
d) 25uf

A

A

99
Q

Which motor uses a run cap but has no start cap?

a) split phase
b) cs motor
c) csr motor
d) psc motor

A

d

100
Q

Symptoms of a TXV air con system if it has lost some of its charge?

a) SH will decrease and high side press up
b) SC increase and low side press up
c) SH increase and low side press down
d) SC increase and low side press up

A

c

101
Q

Pressure of an oil pressure safety switch?

a) oil pump press and crankcase press
b) oil pump press and disch press
c) oil pump press only
d) discharge and spring press

A

a

102
Q

On an 85F outdoor ambient day the air con system indoor coil and suction line has frost. Y to C and G to C read 24v. What are possible issues.

a) defective C, FR, and or ATH
b) defective RC, CF, and or ATH
c) defective FR, IBM or RC
d) defective C, CF, or ATH

A

C

103
Q

What tool is used to cut a threaded hole in metal material?

a) tap
b) die
c) counter sink
d) cutting tool

A

a

104
Q

To convert celsius to Fahrenheit, which is the correct formula?

a) (1.8xC) + 32
b) (1.8-C) + 32
c) (1.8+C) - 32
d) (1.8xC) - 32

A

a

105
Q

To measure the amount of heat in a substance with out the change of state, which formula is correct?

a) temperature x weight x volume
b) temperature x density x volume
c) specific heat x TD x weight
d) specific heat x volume x TD

A

c

106
Q

To ensure proper oil return to the compressor, when installing a refrigerant line set

a) suction line must be pitched away from condensing unit
b) liquid line must be pitched away from the evap coil
c) suction line pitched down toward con unit
d) liquid line must be pitched toward evap coil

A

c

107
Q

What must be done to the system when a condensing unit is pre charged for 25ft of refrigerant line and uses 55ft of refrigerant line

a) operating high side pressure must be reduced by 7psig
b) operating high side pressure increase by 7psig
c) freon added
d) freon removed

A

c

108
Q

What type of freon is R410A

a) single component
b) azeotropic mix
c) near-azeotrpic mix
d) zeotropic mix

A

c

109
Q

What is known as the difference between the vapour and liquid state of a near azeotropic, zeotropic, and a ternary blend refrigerant that occurs during evaporation and condensation at a constant pressure?

a) bubble line value
b) dewpoint value
c) temp glide
d) ternar glide

A

c

110
Q

Which oil has the ability to absorb moisture?

a) alkyl benzene oil
b) polyester oil
c) mineral oil
d) synthetic oil

A

b

111
Q

What is the most hygroscopic oil?

A

POE

112
Q

What does hygroscopic mean?

A

absorb moisture from air

113
Q

Purpose of a filter drier?

A

absorb moisture

114
Q

The counter flow principle is

a) cooler water is in contact with cooler freon liquid and warmer water in contact with hot gas
b) warm water in contact with cooler freon and cooler water in contact with hot gas
c) where hot gas freon meets the cool city water at inlet
d) where sub cooled freon meets leaving water at its outlet

A

a

115
Q

When pressurizing an air conditioning system for the purpose of leak detection, the pressure in the system must never exceed

a) high side test pressure rating
b) low side test pressure rating
c) 500PSIG
d) 500PSIA

A

b

116
Q

What are the common melting points of brazing material and silver solder?

a) 500 to 800F
b) 1100 to 1480F
c) 2000 to 2500f
d) 2500 to 3000f

A

C

117
Q

An ultrasonic leak detector senses a leak by?

a) radar
b) excessive freon concentration
c) sound waves
d) chemical reaction

A

c

118
Q

When making a flare, what can be done to prevent the copper from splitting?

a) cool the copper to 40f
b) heat copper to 105f
c) tighten and loosen the falling tool during the procedure
d) quickly turn the flaring tool as copper expands

A

c

119
Q

To calculate sub cooling

a) subtract liquid line temp from high side condensing temp
b) subtract high side condensing temp from liquid temp
c) subtract ambient temp from high side condensing temp
d) subtract ambient temp from liquid line temp

A

a

120
Q

On a hot gas defrost system using a 24hr defrost timer, what do the normally closed contacts control?

a) hot gas solenoid
b) evaporator fan
c) time control
d) condensing unit

A

b

121
Q

On a 120v power supply, what colour wire is the hot leg

a) white
b) black
c) red
d) green

A

b

122
Q

How can a system be tested to determine if the reversing valve solenoid is leaking internally?

a) temp measurement at inlet and outlet of valve in heat/cool modes
b) impossible to test for internal leaks
c) temp drop across indoor coil during cooling season will tell if rev valve leaking
d) rev valve often has a high pitched whistle if leaking internally

A

A

123
Q

A direct expansion evap coil has the controlled medium in contact with the coil. T or F?

A

T

Term 3 - Review Tests (9 decks)

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