unit 27

What type of pump is typically used to deliver water to the evaporator coil in an ice maker? a. Concentric pump b. Orbital pump c. Centrifugal pump d. Propeller pump

Centrifugal pump

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

Dangerous chlorine gas will form, making it difficult to breathe

What is the function of a flush cycle for an ice flake machine? a. Increase mineral concentration b. Decrease mineral concentration c. Create cloudier ice d. Create softer ice

Decrease mineral concentration

What would be the symptoms of a defective float on an ice maker? a. Increased system efficiency b. Increased ice production c. Excessive load on the system d. Lower operating pressures

Excessive load on the system

Which type of ice is made using a gear motor and auger? a. Cube ice b. Block ice c. Flake ice d. Cylinder ice

Flake ice

Which type of ice maker has a continuous harvest cycle? a. Flake ice b. Cube ice c. Cylindrical ice d. Block ice

Flake ice

What is the most common type of defrost during an ice maker harvest cycle? a. Electric b. Air c. Natural d. Hot gas

Hot gas

What is a common troubleshooting technique used on microprocessors? a. Ohmmeter b. Input/output troubleshooting c. Ammeter d. Guesswork

Input/output troubleshooting

List two causes that may lead to auger wobble. a. Improper bearing alignment and low water level b. Loss of grease and improper bearing alignment c. Loss of grease and low water level d. Excessive grease and high water level

Loss of grease and improper bearing alignment

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

Maintains proper water level and provides low water level protection.

Name three types of ice bin controls in ice flake machines. a. Thermostat, float, and liquid-filled bulb b. Float, thermostat, and infrared electric eye c. Mechanical flapper, infrared electric eye, and thermostat d. Sonar, mechanical flapper, and sail switch

Mechanical flapper, infrared electric eye, and thermostat

Which of the following is a visual indication that sanitizing of an ice maker is needed? a. Presence of bacteria b. Presence of slime c. Presence of viruses d. Presence of protozoa

Presence of slime

What material is often used for evaporators due to its durability and resistance to corrosion? a. Aluminum b. Brass c. Stainless steel d. Copper

Stainless steel

Which part of an ice flake machine is most prone to failure? a. The ice chute b. The float mechanism c. The gear motor d. The compressor

The gear motor

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 water level d. Water inlet temperature and ambient temperature

Water inlet temperature and ambient temperature

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 before the cycle starts to prechill the evaporator c. is the period of time necessary for ice formation d. allows enough ice to form on the evaporator before harvest is initiated

allows enough ice to form on the evaporator before harvest is initiated

Ice with a high mineral content or that is aerated will ________. a. stay frozen longer during storage b. will melt faster than ice that is not c. will require a longer harvest cycle d. appear cloudy and is less desirable

appear cloudy and is less desirable

Sonar, thermostats liquid-filled bulbs, and infrared electric eye are all types of _______. a. bin controls b. harvest cycles c. low water cut offs d. condenser controls

bin controls

Water impurities are commonly classified as a. chemicals, suspended minerals, and dissolved metals. b. chemicals, suspended solids, and dissolved minerals and metals. c. dissolved metals, suspended solids, and suspended minerals. d. chemicals, dissolved minerals, and suspended metals.

chemicals, suspended solids, and dissolved minerals and metals

The most common chemicals in water are a. chloramines and fluoromines. b. fluorine and fluoromines. c. chlorine and fluorine. d. chlorine and chloramines.

chlorine and chloramines

One method of controlling the amount of water coming into the ice flaker's water reservoir is a____________. a. water control valve and a water filter b. dual float switch and an infrared eye c. water solenoid and a thermostat d. dual float switch and a water control valve

dual float switch and a water control valve

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

error code

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

false

Usually, sand and dirt in water are easily removed by a. reverse osmosis. b. de-ionization. c. filters. d. distillation

filters

A measurement that represents the thermal cooling capacity of ice and also represents the amount of calcium and magnesium in water is a. alkalinity. b. scale. c. turbidity. d. hardness.

hardness

When flake ice machines operate with the proper refrigerant charge, ice production depends on two main factors, _____________. a. water purity and ambient air temperature b. water pump RPMs and evaporator size c. evaporator type and harvest cycle method d. inlet water and ambient air temperatures

inlet water and ambient air temperatures

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

inlet water temperature decreases

An ice bridge is best described as the ice that a. freezes at temperatures higher than 32°F. b. connects the ice to the evaporator coil. c. melts during the harvest cycle. d. joins ice cubes together.

joins ice cubes together

Most of the time, the input signals to a microprocessor are a. steady. b. low voltage. c. high frequency. d. high voltage.

low voltage

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. minerals in the water freeze, causing cloudy ice. d. the reservoir may overfill, spilling water out of the unit

minerals in the water freeze, causing cloudy ice

A method for killing bacteria, viruses, and protozoa in ice machines is a. rinsing. b. sanitizing. c. brushing. d. cleaning.

sanitizing

A buildup of minerals that forms a flaky coating on the surface of the evaporator and water system is called a. hardness. b. turbidity. c. scale. d. sediment.

scale

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

that represents the thermal cooling capacity

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

true

Water has to contact the ice-thickness probe for at least 7 seconds before an ice harvest is initiated. a. True b. False

true