Volume 1

Question 1

(001) When using a halide leak detector, the bluish flame turning green indicates
a. a refrigerant leak.
b. the system is leak free.
c. the system is low on oil.
d. the system is low on oil and leak free.

Answer 1

a. a refrigerant leak.

Question 2

(001) On a manifold gauge assembly, the vacuum hose is 3/8 inch and the other hoses are 1⁄4 inch because larger sizes allow for
a. more restrictions which will ensure a better vacuum.
b. fewer restrictions but a vacuum may not be achieved.
c. more restrictions which makes it easier and quicker to pull a vacuum.
d. fewer restrictions which makes it easier and quicker to pull a vacuum.

Answer 2

d. fewer restrictions which makes it easier and quicker to pull a vacuum.

Question 3

(001) Why should the manifold gauge assembly not be used when measuring a vacuum?
a. The manifold gauge assembly will not allow a vacuum to be pulled.
b. The gauge assembly reads inches of fuel and is not accurate when pulling deep vacuums.
c. The gauge assembly reads inches of mercury and is not accurate when pulling deep vacuums.
d. The gauge assembly reads inches of water column and is not accurate when pulling deep vacuums.

Answer 3

c. The gauge assembly reads inches of mercury and is not accurate when pulling deep vacuums.

Question 4

(002) While taking a reading with an infrared thermometer, what happens as you get further from the object being measured?
a. The object will heat up.
b. The reading becomes more accurate.
c. The screen will eventually turn blank.
d. The reading becomes more inaccurate.

Answer 4

d. The reading becomes more inaccurate.

Question 5

(003) What part of the combustion analyzer gets placed into the stack?
a. The probe.
b. The entire analyzer.
c. Half of the analyzer.
d. The handle and probe.

Answer 5

a. The probe.

Question 6

(003) What transfers flue gases from the boiler stack to the indicator unit?
a. Pump.
b. The burner.
c. A tube and hand bulb.
d. Suction from a vacuum.

Answer 6

c. A tube and hand bulb.

Question 7

(003) The special slide-rule calculator and CO2 indicator are used to determine
a. oil pressure.
b. stack temperature.
c. oil and gas pressure efficiency.
d. combustion efficiency and stack loss.

Answer 7

d. combustion efficiency and stack loss.

Question 8

(004) What will occur if you choose more than one conductor to measure when using a clamp on meter?
a. Incorrect readings.
b. The correct reading will be taken.
c. The entire systems amperage will be read.
d. The amperage of the entire component will be read.

Answer 8

a. Incorrect readings.

Question 9

(004) A megohmmeter should never be used on a live circuit because
a. it has its own power source that will start the compressor.
b. it has its own power source and it will ruin the meter.
c. its power source with melt the wires in the system.
d. the voltage reading will be incorrect.

Answer 9

b. it has its own power source and it will ruin the meter.

Question 10

(004) A capacitance checker is used to test
a. the capacitance of a resistor.
b. the voltage of a capacitor.
c. a capacitor’s ohms.
d. a capacitor.

Answer 10

d. a capacitor.

Question 11

(005) A photo tachometer is used to read the
a. revolutions per minute (RPM) of a spinning motor shaft.
b. cubic feet per minute (CFM) of air flow.
c. feet per minute (FPM) of air flow.
d. CFM of a spinning motor shaft.

Answer 11

a. revolutions per minute (RPM) of a spinning motor shaft.

Question 12

(005) When using the stroboscope, the frequency and reading is displayed for the technician when the object appears to be
a. standing still and the rpm of the equipment matches.
b. speeding up and the rpm of the equipment matches.
c. slowing down and the rpm of the equipment rises.
d. standing still and the rpm of the equipment rises.

Answer 12

a. standing still and the rpm of the equipment matches.

Question 13

(005) What pressure will be given if both tubes are connected to the inclined manometer?
a. Velocity pressure.
b. Burner pressure.
c. Static pressure.
d. Total pressure.

Answer 13

a. Velocity pressure.

Question 14

(005) Magnehelic pressure gauges were developed to
a. overcome the disadvantages of the inclined and inclined vertical manometers.
b. establish an industry standard for air measuring.
c. eliminate the need to level equipment.
d. eliminate red gauge oil.

Answer 14

a. overcome the disadvantages of the inclined and inclined vertical manometers.

Question 15

(005) Why does the magnehelic gauge need more frequent calibration?
a. Because it has a poor design.
b. This feature makes in more accurate.
c. Like all gauges it needs calibration for each use.
d. Because it is a mechanical instrument and is sensitive to physical abuse, dirt, dust, corrosive gases, and fluids.

Answer 15

d. Because it is a mechanical instrument and is sensitive to physical abuse, dirt, dust, corrosive gases, and fluids.

Question 16

(005) Why is the accuracy at filters, louvers, and coils very rough?
a. Due to the limited reach of the probe.
b. Because the probe is not placed into the stack.
c. Due to the uncertainty of the Ak (correction factor) area.
d. Because the entire analyzer with probe must be placed into the stack.

Answer 16

c. Due to the uncertainty of the Ak (correction factor) area.

Question 17

(005) In order to be measured by the flow hood, how is all of the air forced to flow through the diffuser or grille?
a. A flow hood or capture box completely surrounds and covers a diffuser or grille.
b. A flow hood will be combined with other tools to capture all of the air.
c. The diffusers are modified.
d. A diffuser adjuster is used.

Answer 17

a. A flow hood or capture box completely surrounds and covers a diffuser or grille.

Question 18

(005) When are flow hoods especially practical?
a. When a journeyman is using them.
b. When performing a hydronic balancing test in a new building.
c. In brand new buildings where the blueprints are readily available.
d. In existing buildings where the manufacturers or Ak factors of the outlets are not known.

Answer 18

d. In existing buildings where the manufacturers or Ak factors of the outlets are not known.

Question 19

(005) If you need a tool that functions as a balancing flowmeter you should select
a. a venturi flowmeter.
b. an orifice plate.
c. a circuit tester.
d. a flow hood.

Answer 19

c. a circuit tester.

Question 20

(006) When pipe is needed for a high pressure application you should select
a. standard strong pipe.
b. extra strong pipe.
c. extra thin pipe.
d. standard pipe.

Answer 20

b. extra strong pipe.

Question 21

(006) Pipe should not be threaded when it is
a. not heavy enough to withstand it.
b. 1⁄2 the wall thickness of the steel weight.
c. a wall thickness less than standard weight.
d. a wall thickness more than standard weight.

Answer 21

c. a wall thickness less than standard weight.

Question 22

(006) When would flanges be installed?
a. To install flare fittings.
b. For permanent installs.
c. With extra strong weighted metal.
d. Wherever it may be necessary to open the joint for service or replacement of components.

Answer 22

d. Wherever it may be necessary to open the joint for service or replacement of components.

Question 23

(007) What must be done before you apply pressure on the dies?
a. Be sure the pipe is threaded.
b. Remove the threaded pipe from the machine.
c. Back off the diestock until it is clear of the pipe in the chuck.
d. Be sure you have the oil running to help start the segments on the pipe.

Answer 23

d. Be sure you have the oil running to help start the segments on the pipe.

Question 24

(007) How are the die segments released?
a. Release lever.
b. Return lever.
c. Supply lever.
d. Oil lever.

Answer 24

a. Release lever.

Question 25

(008) After you clean the threads of the fitting with a wire brush, what is the next step?
a. Remove the threads.
b. Clean the threads with a detergent.
c. Clean the male threads with pipe joint compound.
d. Apply a small amount of pipe joint compound to the male threads.

Answer 25

d. Apply a small amount of pipe joint compound to the male threads.

Question 26

(008) After you screw the fitting hand tight on the pipe in a clockwise direction you immediately
a. tighten with the correct-sized pipe wrench about 2 more turns.
b. tighten with the correct-sized pipe wrench about 5 more turns.
c. tighten with any sized pipe wrench about 3 more turns.
d. select a pipe wrench size.

Answer 26

d. select a pipe wrench size.

Question 27

(008) After you screw the coupling on the pipe hand-tight without using a vise, the next step is to?
a. select one wrench of the proper size.
b. apply pipe dope to the male threads.
c. clean the pipe and fitting threads.
d. select two wrenches.

Answer 27

d. select two wrenches.

Question 28

(009) Aluminum tubing is mostly used in
a. gas lines.
b. burner feed lines.
c. air conditioning applications.
d. the manufacture of evaporators for domestic refrigerators.

Answer 28

d. the manufacture of evaporators for domestic refrigerators.

Question 29

(009) Stainless steel tubing is used
a. in domestic refrigerators.
b. in all oil burning equipment.
c. in air conditioning applications.
d. with milk-handling systems, ice cream manufacture, and in food processing.

Answer 29

d. with milk-handling systems, ice cream manufacture, and in food processing.

Question 30

(009) If you are required to make connections between steel pipe and copper pipe, which fitting would you choose?
a. A tee.
b. An elbow.
c. An adapter.
d. Tees and elbows.

Answer 30

c. An adapter.

Question 31

(010) What is done immediately after the tubing has been cut with a tube cutter?
a. Thread the tubing.
b. Install the copper into the system.
c. Measure the length needed for the installation.
d. Use the tube reamer on the cutter to remove the burr inside the tube.

Answer 31

d. Use the tube reamer on the cutter to remove the burr inside the tube.

Question 32

(010) The first step in cutting tubing with a hacksaw is to select which hacksaw blade
a. 5 teeth per inch.
b. 8 teeth per inch.
c. 30 teeth per inch.
d. 32 teeth per inch.

Answer 32

d. 32 teeth per inch.

Question 33

(011) After slipping the nut on the tubing the next step is to
a. place anchors on pipe every 20 feet.
b. design pipe bends or loops into the system.
c. use special design elbows and tees on system.
d. insert the end of the tubing into the correct-sized hole in the flaring block.

Answer 33

d. insert the end of the tubing into the correct-sized hole in the flaring block.

Question 34

(011) When fabricating a single flare, the next step after you tighten the block’s clamp is to
a. insert tubing in the flaring block.
b. put all pieces back into the flaring kit.
c. place refrigerant oil on the flaring cone.
d. unscrew the clamp handle and open the block.

Answer 34

c. place refrigerant oil on the flaring cone.

Question 35

(012) The gate valve is not suitable for throttling flow because
a. the velocity of flow against the partly opened valve may cause vibration and damage.
b. the vibrations it causes could create incorrect pressure readings.
c. its design will only allow it to be opened 100%.
d. it has similar characteristics of the check valve.

Answer 35

a. the velocity of flow against the partly opened valve may cause vibration and damage.

Question 36

(013) What does the mixing valve do when the leaving water temperature rises above set point?
a. Closes off all discharge.
b. Opens the hot water up more.
c. Mixes refrigerant to keep the temperature down.
d. It will throttle back the hot water and “open up” the cold water.

Answer 36

d. It will throttle back the hot water and “open up” the cold water.

Question 37

(013) What position should the service valve be in during normal operation?
a. Cracked.
b. Back seated.
c. Front seated.
d. Mid position.

Answer 37

b. Back seated.

Question 38

(013) Cracking a service valve will
a. isolate the compressor.
b. prevent a pressure rush.
c. isolate the high and low side of the system.
d. prevent pressure readings from being taken.

Answer 38

b. prevent a pressure rush.

Question 39

(014) What type of cross connection exists if the spout on a sink faucet extends below the overflow rim?
a. Inlet.
b. Direct.
c. Outlet.
d. Indirect.

Answer 39

d. Indirect.

Question 40

(014) What hazard may cause a significant change in water quality?
a. Class I.
b. Class II.
c. Class III.
d. Class IV.

Answer 40

b. Class II.

Question 41

(015) When should the air gap be used?
a. To protect against backpressure.
b. For Class I hazards only.
c. Whenever possible.
d. Never.

Answer 41

c. Whenever possible.

Question 42

(016) To completely burn acetylene, it is not necessary to supply all 11⁄2 parts of oxygen because
a. a portion of the acetone is derived from the air surrounding the flame.
b. a portion of the oxygen is derived from the air surrounding the flame.
c. oxygen does not mix with acetylene outside of the tank.
d. oxygen is pulled from inside the acetylene tank.

Answer 42

b. a portion of the oxygen is derived from the air surrounding the flame.

Question 43

(016) When will the safety plugs in acetylene cylinders melt?
a. 202 to 222 °F.
b. 210 to 220 °F.
c. 212 to 220 °F.
d. 225 to 235 °F.

Answer 43

c. 212 to 220 °F.

Question 44

(016) Care must be taken to prevent propane/butane torch hose damage to
a. prevent complete combustion.
b. keep the customer satisfied.
c. ensure a better connection.
d. prevent a possible fire.

Answer 44

d. prevent a possible fire.

Question 45

(016) What is the last step in operating the propane/butane torch?
a. Attach the torch assembly to the can of propane or butane.
b. Store the assembly in a safe and cool place.
c. Turn the valve off.
d. Solder the joint.

Answer 45

b. Store the assembly in a safe and cool place.

Question 46

(017) Oxygen valve threads are right handed to
a. prevent external combustion.
b. prevent internal combustion.
c. keep you from confusing the oxygen connection with the acetone connections.
d. keep you from confusing the oxygen connection with the acetylene connections.

Answer 46

d. keep you from confusing the oxygen connection with the acetylene connections.

Question 47

(017) The gases from the oxygen and acetylene cylinders are mixed in the
a. tanks.
b. torch tip.
c. mixing head.
d. torch tip and in the tanks.

Answer 47

c. mixing head.

Question 48

(017) How can a regulator leak be detected?
a. A hissing sound coming from the tank valve.
b. The tank valve will be stuck in the closed position.
c. A gradual pressure rise on the working pressure gauge after the cylinder or manifold valve is opened.
d. A gradual pressure rise on the working pressure gauge before the cylinder or manifold valve is opened.

Answer 48

c. A gradual pressure rise on the working pressure gauge after the cylinder or manifold valve is opened.

Question 49

(017) What could occur if copper is used to replace a brass hose splice?
a. Copper acetylene is formed which explodes violently.
b. Solder acetylene is formed which explodes violently.
c. Soldering efficiency will increase by 25 percent.
d. Brazing efficiency will increase by 25 percent.

Answer 49

a. Copper acetylene is formed which explodes violently.

Question 50

(018) Each acetylene and oxygen cylinder valve is cracked to
a. blow out any dirt that may be lodged in the outlet nipple.
b. blow out any dirt that may be lodged in the mixing head.
c. blow out any dirt that may be lodged in the hoses.
d. help make soldering easier.

Answer 50

a. blow out any dirt that may be lodged in the outlet nipple.

Question 51

(018) What is the first step in disassembling an oxyacetylene outfit?
a. Bleed the regulators.
b. Remove the torch tip.
c. Disconnect the regulator.
d. Be sure the gas supply is off.

Answer 51

d. Be sure the gas supply is off.

Question 52

(018) Using a torch wrench helps prevent
a. rounding the torch tips.
b. random pressure increases.
c. random pressure decreases.
d. rounding of corners on connecting and union nuts.

Answer 52

d. rounding of corners on connecting and union nuts.

Question 53

(019) Soft metals are used for soldering because
a. they have low melting points.
b. they have higher melting points.
c. the softer metal is not as abrasive.
d. they are less harmful to the environment.

Answer 53

a. they have low melting points.

Question 54

(019) What is the next step after you think the metal is at the solder’s melting point and you place the flame at the center of the fitting?
a. Move the flame around.
b. Shut off the torch handle.
c. Ensure connections are dry.
d. Touch the solder to the bottom of the joint.

Answer 54

d. Touch the solder to the bottom of the joint.

Question 55

(019) What is a cause for solder not staying on a joint?
a. The pour point is too low.
b. The melting point is the same as the pour point.
c. The melting point and flow points are too far apart.
d. The melting point and flow points are too close together.

Answer 55

d. The melting point and flow points are too close together.

Question 56

(019) Why should 95/5 solder never be used on the discharge line of a refrigerant system?
a. It will become weak and leak.
b. It will cause a restriction in the line.
c. It was designed for aluminum tubing only.
d. It will cause the refrigerant temperature to be higher.

Answer 56

a. It will become weak and leak.

Question 57

(020) How is energy used in the HVAC/R career field?
a. It is destroyed.
b. It is converted.
c. It is left alone.
d. It is created.

Answer 57

b. It is converted.

Question 58

(020) Water sitting at a valve will be potential energy until
a. the static pressure is equal on both sides of the valve.
b. velocity pressure is released and static pressure is added.
c. a technician opens the valve and allows the water to flow.
d. an automated control closes the valve and allows the water to flow.

Answer 58

c. a technician opens the valve and allows the water to flow.

Question 59

(020) When the flow of heat is not reflected in a temperature change, what type of heat change is taking place?
a. Latent heat.
b. Sensible heat.
c. Residual heat.
d. Latent and sensible heat.

Answer 59

a. Latent heat.

Question 60

(020) Molecules closest together when an object is
a. not very dense.
b. a liquid.
c. a solid.
d. a gas.

Answer 60

c. a solid.

Question 61

(020) If pipes are warm and the air is cool, how will the air be warmed?
a. The transfer of heat to the cooler air.
b. The transfer of heat to the warmer air.
c. Heat transfer will not occur in this situation.
d. The transfer of heat from the air to the warmer pipes.

Answer 61

a. The transfer of heat to the cooler air.

Question 62

(020) When a fan propels air across a hot or cold surface, what generally increases heat transfer?
a. Shutting off the fan.
b. A decrease in velocity.
c. The fan slowing down.
d. An increase in velocity.

Answer 62

d. An increase in velocity.

Question 63

(021) When are static measurements taken on an air system?
a. Static measurements are not taken in air systems.
b. After the filter drier is removed.
c. While the fan is moving air.
d. While the fan is off.

Answer 63

c. While the fan is moving air.

Question 64

(021) Velocities measured at different points in the same cross-section of a pipe or ducts are not the same because
a. velocity is constant throughout the system.
b. molecules may slip against each other.
c. there is no friction present.
d. static pressure increases.

Answer 64

b. molecules may slip against each other.

Question 65

(021) If there is no fluid flow in the system, then TP = SP, or
a. system pressure at any point is equal to the static pressure at that point.
b. velocity pressure will be greater than 5 inches of water column.
c. velocity pressure would be greater than static pressure.
d. total pressure will be greater than static pressure.

Answer 65

a. system pressure at any point is equal to the static pressure at that point.

Question 66

(022) In a closed system with constant pressure, if the temperature increases the
a. volume will decrease.
b. volume will increase.
c. volume will stay constant.
d. temperature will eventually drop.

Answer 66

b. volume will increase.

Question 67

(022) Why is it impossible to superheat steam in the presence of boiling water?
a. Steam will never be superheated in HVAC/R.
b. Boiler stack temperatures will not allow this to happen.
c. All the added heat only evaporates more water until all the water has boiled to steam.
d. All of the added heat condenses into more water until all the steam is turned to water.

Answer 67

c. All the added heat only evaporates more water until all the water has boiled to steam.

Question 68

(023) What will the dry-bulb, wet-bulb, and dew point temperatures be when air is saturated?
a. The dew point will be higher than the dry bulb.
b. The wet bulb will be higher.
c. The dry bulb will be higher.
d. They will all be the same.

Answer 68

d. They will all be the same.

Question 69

(023) If the spray water is colder than the dew point of the entering air, the sprays will
a. cleanse the air.
b. humidify the air.
c. dehumidify the air.
d. humidify and dehumidify the air.

Answer 69

c. dehumidify the air.

Question 70

(024) When is solar loading averaged?
a. In the morning.
b. In the evening.
c. Throughout the day.
d. During the hottest part of the day.

Answer 70

c. Throughout the day.

Question 71

(025) What is the final step of heat load calculations?
a. Add sensible and latent loads.
b. Gather building information.
c. Review and trust your work.
d. Speak with the customer.

Answer 71

c. Review and trust your work.

Question 72

(026) What is the first step in determining equipment sizing?
a. Save data.
b. Order the unit.
c. Select the correct equipment.
d. Install and monitor the equipment.

Answer 72

c. Select the correct equipment.

Question 73

(026) After selecting the correct equipment, the next step is to
a. save the data.
b. order the unit.
c. install the equipment.
d. monitor the equipment in operation.

Answer 73

b. order the unit.

Question 74

(027) If equipment cannot keep up with the load, what could be assumed about the system?
a. It is oversized.
b. It is undersized.
c. The load is not enough.
d. That there is no latent heat generated.

Answer 74

b. It is undersized.

Question 75

(027) What is the final step when finding mistakes with sizing?
a. Calculate latent heat, accurately.
b. Calculate building dimensions.
c. Check current facility use.
d. Recheck initial design.

Answer 75

c. Check current facility use.