Title: Final Exam
Course: HET 194 NATE Certification Preparation - Spring 2015 > Section: HET 194 NATE Certification Preparation - Spring 2015

Q: The ability to utilize all types of communication skills is  ______ to the HVACR technician.
- not as important as “hands-on technical skills
- somewhat important
- unimportant
- very important
A: very important

Q: It is important to be _________ in filling out service orders so that office staff, other technicians, and customers will know what work you completed on the job.
- clear
- complete
- concise
- all of the above
A: all of the above

Q: When explaining to a customer that you have topped off the system charge, which of the following terms is most appropriate?
- Freon
- Gas
- Juice
- Refrigerant
A: Refrigerant

Q: Listening carefully to what a customer is telling you ______.
- can help you diagnose the problem
- is a waste of time
- is not necessary
- often will only confuse you
A: can help you diagnose the problem

Q: When you arrive at a service call and meet the customer, you should ______.
- ask questions first, then listen to what the customer has to say
- listen to the customer first, then ask questions
- avoid discussion with the customer
- remind the customer that you are the professional and get on with your work
A: listen to the customer first, then ask questions

Q: What is the volume of a room that measures 10 ft by 20 ft with an 8-ft ceiling?
- 800 cu ft
- 1,600 cu ft
- 2,400 cu ft
- 3,200 cu ft
A: 1,600 cu ft

Q: What is the cfm requirement for a 1,800 sq ft house with 8 ft ceilings, if five air changes per hour are needed?
- 400 cfm
- 1,200 cfm
- 1,600 cfm
- 3,200 cfm
A: 1,200 cfm

Q: What is the cfm requirement for a 2,400 sq ft house with 8 ft ceilings, if five air changes per hour are needed?
- 400 cfm
- 1,200 cfm
- 1,600 cfm
- 2,400 cfm
A: 1,600 cfm

Q: Before leaving a service call, you should be sure to _______.
- ask the customer for referrals
- collect payment in cash if possible
- demonstrate system operation and describe basic maintenance procedures to the customer
- try to sell the customer an equipment upgrade
A: demonstrate system operation and describe basic maintenance procedures to the customer

Q: Customers depend on you to be ______.
- honest
- loyal
- patient
- all of the above
A: all of the above

Q: Housekeeping” includes ______.
- disposal of waste
- fire prevention and protection
- proper storage of materials
- All of the above
A: All of the above

Q: What type of eye protection should you wear when drilling overhead?
- Face sheild
- Goggles
- Side shields
- Spectacles
A: Goggles

Q: What agency regulates cylinders and chemicals transported in a service vehicle?
- ASHRAE
- DOT
- EPA
- OSHA
A: DOT

Q: Material safety data sheets ______.
- contain information about personal protective equipment
- do not provide recommendations regarding emergency procedures
- should be kept in a safe place off-site
- should be kept in a safe place off-site
A: contain information about personal protective equipment

Q: When should oxygen be used in a refrigeration system?
- To clear a restriction in the line.
- To pressurize for leak-testing.
- To purge lines for brazing.
- Never
A: Never

Q: What is the maximum safe storage temperature of a refrigerant cylinder filled to 80% capacity by weight?
- 120 F
- 125 F
- 130 F
- 135 F
A: 125 F

Q: Which of the following classifications of fire extinguishers should be used for electrical fires?
- A
- B
- C
- D
A: C

Q: Which of the following categories could be considered a hazardous atmosphere in a confined space?
- Asphyxiation
- Flammable
- Toxic
- All of the above
A: All of the above

Q: Which of the following best describes an asphyxiating atmosphere?
- Low oxygen level
- Presence of ammonia
- Presence of carbon monoxide
- Presence of nitrogen
A: Low oxygen level

Q: If a ladder is placed against a wall that is 20 ft tall, what is the proper distance away from the wall for the base of the ladder?
- 3 ft
- 4 ft
- 5 ft
- 6 ft
A: 5 ft

Q: What is the advantage of using a tube cutter to cut copper pipe?
- It can cut hard or soft drawn copper.
- It leaves no metal shavings to contaminate the system.
- It produces a clean, square cut.
- All of the above
A: All of the above

Q: Spring-type benders may be used on ______.
- soft drawn copper
- hard drawn copper
- all copper pipe
- steel pipe
A: soft drawn copper

Q: A flaring tool is used to ______.
- make a mechanical joint in tubing
- measure pipe diameters
- remove burrs from piping
- separate pipe fittings
A: make a mechanical joint in tubing

Q: A swaging tool is used to ______.
- cut copper tubing
- make a mechanical joint in tubing e for fodder
- remove burrs from piping
- solder tubing without the use of couplings
A: solder tubing without the use of couplings

Q: What is one of the advantages of a glass-stem thermometer?
- It is very accurate.
- It is very durable.
- It comes with a digital read out.
- None of the above
A: It is very accurate.

Q: In discussing human comfort, the temperature most commonly referred to is
- dew point
- dry-bulb
- relative humidity
- wet-bulb
A: dry-bulb

Q: A sling psychrometer uses two glass-stem thermometers. One measures dry-bulb, and the other measures ______.
- dew point
- enthalpy
- relative humidity
- wet-bulb
A: wet-bulb

Q: A standard refrigeration manifold uses what type of element to measure pressure?
- Bellows
- Burdon tube
- Diaphragm
- Spring
A: Burdon tube

Q: What is the pressure range of a standard compound gauge on a refrigeration manifold?
- 0 to 350 psig
- 0 to 500 psig
- 30” Hg to 350 psig
- 30” Hg to 500 psig
A: 30” Hg to 350 psig

Q: What is the best tool for removing moisture and non-condensables from a system before adding refrigerant?
- Manifold gauge
- Micron analyzer
- Recovery machine
- Vacuum pump
A: Vacuum pump

Q: Which of the following represents a different temperature than the other three?
- 15°C
- 59°F
- 475°K
- 519°R
A: 475°K

Q: Of the following choices, the warmest temperature is ____.
- 20°C
- 303°K
- 501°R
- 77°F
A: 303°K

Q: s the temperature of a material increases, the molecules in the material ____.
- travels farther
- travels faster
- slows down
- travels in a more of a parallel direction
A: travels faster

Q: How many Btus are required to change one pound of ice at 20°F to steam at 220°F?
- 1,304 Btu/h
- 2,608 Btu/h
- 6,520 Btu/h
- 3,912 Btu/h
A: 1,304 Btu/h

Q: How many Btus must be removed from one pound of water at 200°F for it to end up as ice at 30°F?
- 144 Btu
- 828 Btu
- 313 Btu
- 526 Btu
A: 313 Btu

Q: The standard atmospheric pressure at sea level is ____.
- 29.60" Hg
- 29.71" Hg
- 29.83" Hg
- 29.92" Hg
A: 29.92" Hg

Q: A vapor material exerts a pressure or force ____.
- in all directions
- downward only
- outward and downward
- outward only
A: in all directions

Q: If the temperature remains constant and the volume that a gas occupies increases, the pressure will  ____.
- decrease
- increase
- remain the same
- cannot be determined from the information given
A: decrease

Q: At a constant pressure, the volume of a gas varies as to the absolute temperature and at a constant volume the pressure of the gas varies directly with the absolute temperature. This is known as ____.
- Charles' Law
- Tom's Law
- Boyle's Law
- Dalton's Law
A: Charles' Law

Q: The total pressure of a confined mixture of gases is the sum of the pressures of each of the gases in the mixture. This is known as ____.
- Charles' Law
- Tom's Law
- Boyle's Law
- Dalton's Law
A: Dalton's Law

Q: If five electrons combine with three protons, the net charge will be ____.
- negative
- positive
- zero
- neutral
A: negative

Q: What part of an atom moves from one atom to another?
- proton
- neutron
- electron
- molecule
A: electron

Q: Typical insulators are ____.
- copper, silver, gold
- steel, bronze, brass
- glass, rubber, plastic
- aluminum, nickel, magnesium
A: glass, rubber, plastic

Q: An ampere is ____.
- the difference in potential between two charges
- a measure of the quantity of electrons flowing past a point in the electrical circuit in a given time
- the unit of measure for resistance
- the unit of measure for capacitance
A: a measure of the quantity of electrons flowing past a point in the electrical circuit in a given time

Q: If two light bulbs are wired in series and one bulb burns out, the other bulb will ____.
- go out
- stay on
- stay on, but it will be dimmer
- stay on, but it will be brighter
A: go out

Q: What happens to the current in a circuit if the resistance is increased?
- The current remains the same.
- The current increases.
- The current decreases.
- This cannot be determined.
A: The current decreases.

Q: An element in an electric heating unit is applied to a 232-volt power supply. The current flow through the element is 19 amperes. What is the resistance of the element?
- 8 ohms
- 10 ohms
- 12 ohms
- 14 ohms
A: 12 ohms

Q: As loads are added in a parallel circuit, the total resistance of the circuit ____.
- will increase
- will decrease
- will remain the same
- cannot be determined
A: will decrease

Q: To find the watts of electrical power in an electrical circuit, you multiply ____.
- ohms and amperes
- ohms and volts
- volts and amperes
- volts, amperes, and ohms
A: volts and amperes

Q: If a conductor carrying electrical current is formed into a coil, the magnetic field around the wire will ____.
- cancel out
- increase
- decrease
- remain the same
A: increase

Q: A motor's speed is determined by ____.
- size
- voltage
- amperage
- number of motor poles
A: number of motor poles

Q: Start windings are placed ____ with the run windings.
- 180 degrees out of phase
- in phase
- slightly out of phase
- in series
A: slightly out of phase

Q: The start windings have ____.
- fewer turns than the run windings
- more turns than the run windings
- the same number of turns as the run windings
- larger diameter wire than the run windings
A: more turns than the run windings

Q: When a general duty split-phase motor reaches approximately 75% of its operating speed, the start winding is de-energized by a ____.
- circuit board
- capacitor
- centrifugal switch
- dual voltage switch
A: centrifugal switch

Q: When a Capacitor Start, Capacitor Run (CSCR) motor initially starts, what is the total capacitance acting on the motor? (Assume the run capacitor is 5 microfarads and the start capacitor is 20 microfarads, if present.)
- 4 microfarads
- 5 microfarads
- 20 microfarads
- 25 microfarads
A: 25 microfarads

Q: Capacitors wired in series with the starting winding provide a(n) ____.
- longer starting time
- greater starting torque
- aid in starting three phase motors
- more efficient operation at full load speed
A: greater starting torque

Q: The shaded pole motor ____.
- has little starting torque
- has excessive starting torque
- has greater efficiency than most split-phase motors
- will start against a heavy starting load
A: has little starting torque

Q: Three phase motors have ____.
- three start and three run windings for each phase
- one start and one run winding for each phase
- run windings only
- a start switch in each phase circuit
A: run windings only

Q: The starting device usually used on single phase, fractional horsepower motors requiring low starting torque is the ____.
- Truepotential relay
- current relay
- centrifugal switch
- differential relay
A: current relay

Q: The positive temperature coefficient resistor start device is a type of ____.
- capacitor
- variable resistor
- switching device
- diode
A: variable resistor

Q: The primary function of any wiring diagram is to ______.
- aid the technician in finding the problemirth
- help the owner repair the problem
- provide the location of the componentsshingg of grains
- reduce repair time
A: aid the technician in finding the problemirth

Q: How many functions is an individual circuit in a control system designed to control?
- One
- Two
- Three
- Unlimited
A: One

Q: The five basic components common to all schematics are a power supply, a path, a load, a legend, and a ______.
- contactor
- relay
- switch
- thermostat
A: switch

Q: The intention of the overall schematic is to show how the circuit _____.
- components are connected
- fails
- functions
- looks
A: functions

Q: The type of schematic that provides the most helpful troubleshooting information for the service technician is the ______ diagram.
- connection
- installation
- ladder
- pictorial
A: ladder

Q: Devices that consume power and convert it to some other form of energy, such as motion or heat, are ______.
- contacts
- fuses
- loads
- transformers
A: loads

Q: The normal dividing line for voltage changes in a schematic is the ______.
- contactor
- fuse
- relay
- transformer
A: transformer

Q: The part of a schematic that lists and explains the system components is called the ______.
- appendix
- guide
- index
- legend
A: legend

Q: Relays and contactors are ______ control switches.
- electrically operated
- manually operated
- pressure-activated
- temperature-activated
A: temperature-activated

Q: A(n) _______ circuit allows the same current to flow through all of the components.
- ac
- dc
- parallel
- series
A: series

Q: On all meters, digital and analog, the scale used should indicate the measurement _______.
- close to the bottom of the fange
- close to the middle of the range
- close to the top of the range
- anywhere within the range
A: anywhere within the range

Q: When testing compressor windings, you take the following readings: C to R: 2 ohms; C to S: infinite resistance; R to S: infinite resistance. What is the diagnosis?
- The compressor is good
- The run winding is shorted
- The start winding is shorted
- The start winding is open
A: The start winding is open

Q: A wiring and crimping tool is used to ____.
- crimp tubing
- cut and strip wire
- staple low voltage wire
- fasten insulation to duct
A: cut and strip wire

Q: When testing a thermostat wire that has been removed from the circuit, you measure 0 ohms between red and white. This indicates that _______.
- the transformer is bad
- A ewe or doe that is not bred
- there is high resistance in the wire
- there is a short
A: there is a short

Q: When using a standard clamp-on ammeter, you should _______ before taking a reading.
- disconnect all of the wires in the circuit being tested
- make sure that the jaws are closed
- make sure that the jaws are open
- shut down and lock out the equipment being tested
A: make sure that the jaws are closed

Q: What does a resistance reading of 0 ohm indicate?
- The circuit is open
- The meter needs a new battery
- The meter needs to be recalibrated
- There is a short circuit
A: There is a short circuit

Q: A gauge and manifold assembly used in refrigeration work may include ____.
- compound gauge, standard gauge, manifold, valves and hoses
- either two or four valves
- a four-way valve design using a shutoff valve for each hose
- all of the above
A: all of the above

Q: A sling psychrometer ____.
- measures the dry-bulb and wet-bulb temperatures of air
- measures the air velocity through a duct
- uses a microprocessor to provide information for proper air balance
- measures the quantity of air, in cfm, flowing through a duct
A: measures the dry-bulb and wet-bulb temperatures of air

Q: The halide leak detector ____.
- detects nitrogen leaks in the refrigeration system
- is used to detect water leaks in a chilled water system
- detects refrigerant leaks in a refrigeration system
- detects air leaks in duct systems
A: detects refrigerant leaks in a refrigeration system