Q2 2021 10 both sections Donuts
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School
Michigan State University *
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Course
470
Subject
Industrial Engineering
Date
Jan 9, 2024
Type
docx
Pages
2
Uploaded by CommodoreFieldJaguar22
Name: ___________________________
Quiz 2 – Section 001
Dandy Donuts makes and sells thousands of donuts each day. Demand is greater than supply.
The donut production process starts with the measuring of ingredients. First, one employee pours
the pre-packaged dry mix into a large bowl located on a scale. It takes five (5) minutes to get the
proper weight of 40 pounds. Once the proper amount has been measured, the employee will add
yeast in one (1) minute and mix the dry ingredients for one (1) minute.
During that process, a second employee measures the moist ingredients (eggs, water, and others)
in eight (8) minutes and stirs them in a large mixing bowl for one (1) minute.
Then, the second employee slowly pours the wet mixture into the dry mix, while mixing, for a
four (4) minutes time span. When the two mixes are combined, the second employee begins the
kneading process, which takes exactly 13 minutes. The dough is now ready to be shaped into
3,900 donuts.
1.
(25 points) What is the throughput time to form the dough (assuming no setup, moving,
or wasted time)?
2.
(25 points) Which process (from the product-process matrix) is being used to make the
dough?
3.
(25 points) What is the output rate?
4.
(25 points) What is the utilization rate of the second employee?
Name: ___________________________
Quiz 2 – Section 002
Dandy Donuts makes and sells thousands of donuts each day. Demand is greater than supply.
The dough is placed into an extrusion machine which produces eight (8) donuts in five (5)
seconds, placing them onto a steel shelve which moves throughout a “proofing” machine to
allow the dough to slowly rise (inflate). After 30 minutes in the proofing machine, the now-puffy
donuts slide one shelf at a time into a fryer.
The donuts fry for one (1) minute; then, they are mechanically flipped to fry on the opposite side.
After the second minute, the donuts emerge on a conveyer belt and move through a glazed
waterfall (melted sugar glaze) which covers the tops, sides, and bottoms of the donut. It takes 1
minute on the waterfall conveyor belt. Then, the donut transfers to a second conveyor belt for
two (2) minutes to dry and cool.
Once at the right temperature, 12 donuts are placed into one box, ready for sale. It takes an
employee 55 seconds to load one box and close its lid. There are nine (9) packing employees.
Show your math to receive partial credit
1.
(25 points) What is the output rate?
2.
(25 points) What is the throughput time from dough to finished box (assuming no setup,
moving, or wasted time)?
3.
(25 points) Which process (from the product-process matrix) is being used to glaze the
donuts?
4.
(25 points) What is the utilization rate of each packing employee, on average?
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