WorksheetsACR 106 - Unit 27 - Commercial Ice Machines Mr. Graham
Total questions: 37
Worksheet time: 19mins
Package ice machines store their own ice at ____°F in a bin below the ice maker.
10
18
24
32
Most package ice makers are ____-cooled.
water
air
moisture
refrigerant
____ ice is normally made in a vertical refrigerated cylinder surrounded by the evaporator on the outside.
Solid
Cube
Flake
Chip
The auger in a flake ice maker has cutting surfaces called ____.
flights
fins
shafts
gears
A ____ is used to turn the auger in a flake ice machine.
step motor
geared motor
worm motor
hydraulic motor
Most ice flakers have a ____ that reduces the auger drive motor’s speed from about 1725 rpm to 9 to 16 rpm.
gear improvement drive
gear intensive drive
gear shift drive
gear reduction drive
____ evaporators have ice cups designed to cause the ice to fall out of the cups during defrost.
Vertical
Horizontal
Hybrid
Linear
____ ice cube machines usually have vertical evaporator plates with water flowing over the individual cells.
Modular
Linear
Cell-type
Cup-type
____ between the evaporator cells allow air entering from the edges of the ice to travel along the entire ice slab and relieve the suction force.
Space holes
Weep holes
Release spots
Weep space
____ are simply small computers that contain stored programs or algorithms.
Auto processors
Signal processors
Microcontrollers
Microprocessors
For maximum efficiency, individual ice machine models have different programs called algorithms stored in their ____.
EEPROM
ERAM
EPRAM
PRAM
12. Microprocessors are often referred to as ____.
integrated circuit controllers
the heart of the computer
the memory of the computer
the power supply of the computer
Which of the following are integrated circuit controllers?
signal controllers
digital controllers
integrated device controllers
integrated circuit controllers
Many filter manufacturers use (a) to inhibit calcium or lime scale buildup.
wool
polysorbate
polyphosphate
polyphenols
Most package ice machines are designed to be located in ambient temperatures of (a) .
40°F to 110°F
50°F to 115°F
50°F to 120°F
When using cleaning and sanitizing chemicals, it is unnecessary to wear protective clothing and eyewear.
True
False
Ice-making machines are the same as ice-holding machines such as those seen on the outside of a convenience store or service station.
True
False
The gear motor assembly is less prone to failure than any other part in the ice flaker.
True
False
Manufacturers of ice flakers install thermal overload controls in the motor windings or a manual-reset, current-type overload control.
True
False
It is important that the auger does not wobble within the freezing cylinder or evaporator.
True
False
Water levels can be sensed and controlled by a probe located in the water reservoir.
True
False
Solid forms of ice last longer because there is more weight with less surface area.
True
False
Most ice makers use a hot gas harvest or defrost to melt an ice sheet off the evaporator.
True
False
Ice is not considered a food source.
True
False
It is recommended that at least ________________ a year, the probe should be removed from the water reservoir and cleaned.
twice
once
three times
four times
The ________________ is usually made of two reed switches and two floats.
dual float switch
single float switch
triple float switch
quad float switch
26. ________________-type devices are usually located in the spout.
Mechanical flapper
Electronic sensor
Hydraulic valve
Pneumatic actuator
27. ________________ sense the buildup of ice by infrared technology. This control allows the ice machine to shut down before the ice chokes the spout opening.
Sensors
Thermostats
Valves
Compressors
28. ____________________ controls use sound waves and vibrations, which are reflected back to the control from the ice.
Sonar
Radar
Laser
Infrared
Making a(n) ____________________-shaped ice cube involves running water over an evaporator plate in which the copper evaporator tubing is soldered onto the plates at regular intervals.
crescent
square
circular
triangular
30. What are the steps for installing a package machine?
Set and level the machine, Supply power, plug, or hardwire, Provide a water supply, Provide a drain for the ice bin.
Read the manual, call a technician, wait for installation, start using
Order the machine, receive it, leave it in the box, use it
None of the above
31. List some of the methods used for ice bin control.
Thermostat control, Timer control, and Manual control
Pressure control, Humidity control, and Light control
Sound control, Vibration control, and Motion control
Temperature control, Speed control, and Volume control
Devices used in commercial ice machines include:
Compressors, condensers, evaporators, and expansion valves
Motors, gears, belts, and pulleys
Heaters, thermostats, and fans
Pumps, filters, and hoses
How does the mechanical flapper work?
By pressure and activate a microswitch
By rotating continuously
By vibrating to create sound
By expanding and contracting
When operating at the proper refrigerant charge, ice production in flake ice machines depends on two main factors. What are these factors?
Ambient temperature and water temperature
Refrigerant type and machine size
Ice thickness and machine age
Water quality and maintenance schedule
Why is the gear motor assembly more prone to fail than any other part in the ice flaker?
It is the most complex part.
It operates under high stress.
It is made of inferior materials.
It is rarely maintained.
Ice production, cycle times, and system operating pressures for an air-cooled ice machine mainly depend on two factors. Identify them?
Temperature of the air entering the condenser.
Temperature of the water entering the ice machine.
Refrigerant type and compressor size
Voltage supply and fan speed
Ice bin size and water filter type
