Unit 27 Test and Quiz Review

B

A buildup of minerals that forms a flaky coating on the surface of the evaporator and water system is called A. sediment B. scale C. hardness D. turbidity

A

A measurement that represents the thermal cooling capacity of ice and also represents the amount of calcium and magnesium in water is A. hardness B. turbidity C. alkalinity D. scale

A

A method for killing bacteria, viruses, and protozoa in ice machines is A. sanitizing B. cleaning C. rinsing D. brushing

D

A time period, referred to as freeze-lock __________________ A. allows a delay before the freeze cycle begins so the water reservoir can be flushed B. is the period of time necessary for ice formation C. is the period before the cycle starts to prechill the evaporator D. allows enough ice to form on the evaporator before harvest is initiated

C

A triple-action carbon filtration system has the ability to accomplish all of the following except: A. filter solids from the water B. improve the taste of the water C. increase the scale formation rate in the water D. reduce the odor of the water

B

A way in which a microprocessor communicates to a service technician about a certain malfunction in the ice machine is a (n) A. summary B. error code C. history D. data link

A

Air-cooled, package-type ice makers should be positioned so that A. there is adequate airflow through the condenser that does not recirculate B. the condenser air can be used to defrost the evaporator coil C. the discharge condenser air is directed toward the ice storage bin's door D. the field-installed refrigerant lines are at the back of the unit

A

An ice bridge is best describe as the ice that A. joins ice cubes together B. melts during the harvest cycle C. connects the ice to the evaporator coil D. freezes at temperatures higher than 32 degrees F

False

As the inlet water temperature increases, the ice production will increase if the ambient air temperature stays constant True or False

A

Condensing hot gas that can return to the compressor during harvest is called A. floodback B. flowback C. flowthrough D. floodthrough

C

Ice production in an ice flake machine depends mainly on two factors. Name these two factors A. Water outlet temperature and ambient temperature B. Water outlet temperature and water level C. Water inlet temperature and ambient temperature D. Water inlet temperature and water level

A

Ice quality is measured in percent of hardness. Hardness is a measurement ______________________. A. that represents the thermal cooling capacity B. of the calcium and magnesium removed during the freeze cycle C. of the water quality used to make the ice D. used to describe ice thickness in centimeters (cm)

D

Ice with a high mineral content or that is aerated will ____________________. A. will melt faster than ice that is not B. stay frozen longer during storage C. will require a longer harvest cycle D. appear cloudy and is less desirable

D

If the water flow over the evaporator of an ice maker is too slow __________________ A. the harvest cycle may not be initiated B. the compressor may lockout on high pressure C. the reservoir may overfill, spilling water out of the unit D. minerals in the water freeze, causing cloudy ice

D

List two causes that may lead to auger wobble A. Loss of grease and low water level B. Excessive grease and high water level C. Improper bearing alignment and low water level D. Loss of grease and improper bearing alignment

C

Minerals are removed from the ice maker when which of the following components is energized? A. Float switch B. Auger assembly C. Water dump solenoid D. Ice bridge sensor

True

Most ice makers use hot gas harvest or defrost to melt an ice sheet off the evaporator True or False

B

Most of the time, the input signals to a microprocessor are A. high voltage B. low voltage C. steady D. high frequency

D

Name three types of ice bin controls in ice flake machines A. Float, thermostat, and infrared electric eye B. Thermostat, float, and liquid-filled bulb C. Sonar, mechanical flapper, and sail switch D. Mechanical flapper, infrared electric eye, and thermostat

B

One method of controlling the amount of water coming into the ice flaker's water reservoir is a ____________________ A. dual float switch and an infrared eye B. dual float switch and a water control valve C. water control valve and a water filter D. water solenoid and a thermostat

A

One of the quickest and most thorough way of obtaining technical service information for an ice machine is through the A. manufacturer B. wholesale store C. Internet D. telephone

D

Periodic ice machine cleaning accomplishes which of the following? A. Making clearer ice B. Making harder ice C. Making both clearer and harder ice D. Making neither clearer nor harder ice

D

Scale is most effectively removed from an ice maker by A. scraping the scale from the evaporator surface with a sharp blade or knife B. using a heat source, such as a torch, to burn the scale from the ice maker C. using an alcohol-based, general-purpose cleaner to remove the scale from the machine D. using a manufacturer-approved cleaner expressly intended to remove scale

A

Sonar, thermostats liquid-filled bulbs, and infrared electric eye are all types of _________________ A. bin controls B. condenser controls C. low water cut offs D. harvest cycles

B

The amount of ice that is produced in a 24-hour period will increase if the A. inlet water temperature increases B. inlet water temperature decreases C. ambient temperature increases D. system's suction pressure increases

A

The most common chemicals in water are A. chlorine and chloramines B. fluorine and fluoromines C. chloramines and fluoromines D. chlorine and fluorine

B

The purpose of weep holes on the evaporator A. ensure the ice sticks to the evaporator B. allow the ice to separate from the evaporator during harvest C. allow water to flow freely through the evaporator cells D. ensure that minerals are not frozen in the ice cubes

A

Usually, sand and dirt in water are easily removed ny A. filters B. reverse osmosis C. distillation D. de-ionization

True

Water has to contact the ice-thickness probe for at lease 7 seconds before an ice harvest is initiated True or False

D

Water impurities are commonly classified as A. chemicals, dissolved minerals, and suspended metals B. chemicals, suspended minerals, and dissolved metals C. dissolved metals, suspended solids, and suspended minerals D. chemicals, suspended solids, and dissolved minerals and metals

C

What are the two functions of the dual float switch in an ice flake machine? A. Maintains proper ice level and provides low water level protection B. Maintains proper ice level and provides high water level protection C. Maintains proper water level and provides low water level protection D. Maintains proper water level and provides high water level protection

A

What is a common troubleshooting technique used on micropressors? A. Input/output trouble shooting B. Ohmmeter C. Ammeter D. Guesswork

B

What is the function of a flush cycle for an ice flake machine? A. Increase mineral concentration B. Decrease mineral concentration C. Create softer ice D. Create cloudier ice

C

What is the most common type of defrost during an ice maker harvest cycle? A. Electric B. Natural C. Hot gas D. Air

D

What material is often used for evaporators due to its durability and resistance to corrosion? A. Copper B. Brass C. Aluminum D. Stainless Steel

B

What portion of the service manual provides information about what each system component does and when? A. Table of contents B. Sequence of operation C. Installation guidelines D. Unit's parts list

A

What type of pump is typically used to deliver water to the evaporator coil in an ice maker? A. Centrifugal pump B. Propeller pump C. Orbital pump D. Concentric pump

A

What would be the symptoms of a defective float on an ice maker? A. Excessive load on the system B. Increased ice production C. Lower operating pressures D. Increased system efficiency

A

When flake ice machines operate with the proper refrigerant charge, ice production depends on two main factors, ___________________________. A. inlet water and ambient air temperatures B. water pump RPMs and evaporator size C. water purity and ambient air temperature D. evaporator type and harvest cycle method

A

Which of the following is a visual indication that sanitizing of an ice maker is needed? A. Presence of slime B. Presence of bacteria C. Presence of protozoa D. Presence of viruses

B

Which of the following is used to initiate the harvest cycle on a cube ice maker? A. Auger assembly B. Ice thickness probe C. Float switch D. Water dump valve

A

Which part of an ice flake machine is most prone to failure? A. The gear motor B. The float mechanism C. The ice chute D. The compressor

C

Which type of ice is made using a gear motor and auger? A. Cube ice B. Cylinder ice C. Flake ice D. Block ice

B

Which type of ice maker has a continuous harvest cycle? A. Cube ice B. Flake ice C. Block ice D. Cylindrical ice

D

Why can't an ice maker be cleaned and sanitized at the same time? A. It will take too long to do so B. They can. Cleaning and sanitizing are the same thing C. One requires the unit to be operating, while the other requires the unit to be off D. Dangerous chlorine gas will form, making it difficult to breathe