# Flexible Manufacturing System Questions and Answers – Analysis of Storage Systems

This set of Flexible Manufacturing System Multiple Choice Questions & Answers (MCQs) focuses on “Analysis of Storage Systems”.

1. Which analysis will be done on the operation of a storage system?
a) Structural Analysis
b) Qualitative Engineering Analysis
c) Stress Analysis
d) Quantitative Engineering Analysis

Explanation: Quantitative Engineering Analysis will be carried out on the operation of a storage system. This is done in order to further optimize the entire system to that of an idealized model.

2. Maximizing the work in progress is always desirable.
a) True
b) False

Explanation: It is always desirable to minimize the work in process. Work in Process is an unavoidable aspect in a manufacturing industry. It should be effectively managed.

3. Which of the following depends on the storage compartments that are arranged horizontally or vertically in an aisle?
a) Flow Velocity
b) Total Storage Capacity
c) Number of Wheels
d) Braking Speed

Explanation: The storage system analyzing parameter which depends on the storage compartments that are arranged horizontally or vertically in an aisle is the total storage capacity. As the number of storage compartments increases, total storage capacity increases.

4. How is the capacity per aisle calculated where ny represents the number of load compartments along the length of the aisle and nz represents the number of load in the height of the aisle?
a) 0.5 ny nz
b) 2 ny nz
c) 0.1 ny nz
d) $$\frac {1}{4}$$ ny nz

Explanation: The capacity per aisle calculated as 2 ny nz where ny represent the number of load compartments along the length of the aisle and nz represents the number of load in the height of the aisle.

5. Automated storage and retrieval systems are designed such that its dimensions will be smaller than the unit load dimensions.
a) True
b) False

Explanation: Automated storage and retrieval systems are designed such that its dimensions will be larger than the unit load dimensions. A certain tolerance will be provided for the smooth handling of equipments.

6. How is the length of the rack structure of AS / RS calculated where x, a and ny represent the dimensions of unit load, allowances for the load and number of load compartments?
a) W = nz (x + b)
b) W = ny (x + a)
c) W = nz (x + a)
d) W = ny (y + b)

Explanation: The width of the rack structure of AS / RS calculated as: W = ny (y + b) where x, a and ny represent the dimensions of unit load, allowances need to given for unit loads in the storage system and number of loads along the length of the aisle.

7. How is the width of the rack structure of AS / RS calculated where x and a are the dimensions of unit load and allowances?
a) W = 3(x + a)
b) W = 1 / 4(x + a)
c) W = 1 / 2(x + 0.1a)
d) W = y + 0.5a

Explanation: The width of the rack structure of AS / RS calculated as: W = 3(x + a) where x and a are the dimensions of unit load and allowances need to given for unit loads in the storage system.

8. How is the height of the rack structure of AS / RS calculated where x and a are the dimensions of unit load and allowances?
a) H = nz (z + 9c)
b) H = nz (z + 3c)
c) H = nz (z + 0.1c)
d) H = nz (z + c)

Explanation: The height of the rack structure of AS / RS calculated as: H = nz (z + c) where z, c and nz represent the dimensions of unit load, allowances need to given for unit loads in the storage system and number of unit loads along the height of the aisle.

9. A two aisle AS / RS has 15 storage compartments in the length direction and 12 storage compartments vertically. How many unit loads can be stored in this systems?
a) 540
b) 720
c) 180
d) 360

Explanation: Given,
No. of storage compartments in the length direction (ny) = 15
No. of storage compartments along the height (nz) = 12
No. of aisles = 2
To Find: Total number of unit loads to be stored i.e., storage capacity
Solution: Storage capacity of an aisle = 2 ny nz
= 2 * 15 * 12
Storage capacity of an individual aisle = 360
Since there are 2 aisle, total storage capacity = 360 * 2
Total storage capacity of this AS / RS system = 720.

10. A 3 aisle AS / RS system has the following standard pallet dimensions: x = 20 in, y = 15 in, z = 10 in and has the allowances a = 4 in, b = 4 in and c = 1 in. Calculate the overall width of the AS / RS?
a) 22 ft
b) 66 ft
c) 18 ft
d) 198 ft

Explanation: Given, Standard Pallet dimensions: x = 20 in, y = 15 in, z = 10 in
Allowances: a = 2 in, b = 4 in and c = 1 in
To find: Overall width of the AS / RS
Solution: Width of the AS / RS = 3(x + a)
= 3 * (20 + 4)
Width of the single AS / RS = 72 in = 6 ft / aisle
Overall Width of the aisle = 6 * 3 = 18 ft.

11. An S / R machine is used for each aisle in AS / RS system. The length of the storage aisle is 120 ft and its height is 50 ft. The horizontal and vertical speeds of the S / R machines are 150 ft / min and 80 ft / min. The pickup and deposit time is 10 sec. What will be the single command cycle time?
a) 0.03 min / cycle
b) 1.13 min / cycle
c) 0.1 min / cycle
d) 50 min / cycle

Explanation: Given, Length of the aisle (L) = 120 ft
Height of the aisle (H) = 50 ft
Horizontal Speed of the S / R Machine (xy) = 150 ft / min
Vertical Speed of the S / R Machine (xz) = 80 ft / min
Pickup and deposit Time (Tpd) = 10 sec
To Find: Single Command Cycle Time
Solution: Single Command Cycle Time = Max {(L / xy), (H / xz)} + 2 Tpd
= Max {(120 / 150),(50 / 80)} + 2(10 / 60)
= Max {0.8, 0.625} + 0.33
Single Command Cycle Time = 1.13 min / cycle

12. An S / R machine is used for each aisle in AS / RS system. The length of the storage aisle is 360 ft and its height is 70 ft. The horizontal and vertical speeds of the S / R machines are 100 ft / min and 60 ft / min. The pickup and deposit time is 90 sec. What will be the dual command cycle time?
a) 0.03 min / cycle
b) 11.3 min / cycle
c) 10.1 min / cycle
d) 5.0 min / cycle

Explanation: Given, Length of the aisle (L) = 360 ft
Height of the aisle (H) = 70 ft
Horizontal Speed of the S / R Machine (xy) = 100 ft / min
Vertical Speed of the S / R Machine (xz) = 60 ft / min
Pickup and deposit Time (Tpd) = 90 sec
To Find: Single Command Cycle Time
Solution: Dual Command Cycle Time = Max {(1.5L / xy),(1.5H / xz)} + 4 Tpd
= Max {(1.5 * 360 / 100), (1.5 * 70 / 60)} + 2(90 / 60)
= Max {5.4, 1.75} + 4 * (90 / 60)
Dual Command Cycle Time = 11.4 min / cycle.

13. Which of the following is used as a measure of storage capacity of the carousel system?
a) Length of the Aisle
b) Cycle Time
c) Flow Velocity
d) Number of Bins

Explanation: The number of bins is used as a measure of storage capacity of the carousel system. Higher the number of bins larger will be the storage capacity of the carousel storage system.

14. The carousel system has 20 carriers and three bins. The Volumetric capacity of each bin 0.04 m3. What will be volumetric capacity of the storage system?
a) 9.9 m3
b) 0.2 m3
c) 1.8 m3
d) 2.4 m3

Explanation: Given, No. of carriers = 20
No. of bins = 3
Volumetric Capacity of each bin = 0.04 m3
To Find: Storage Capacity
Solution: Total number of bins = 20 * 3 = 60 bins
Total Volumetric Capacity = 60 * 0.04
Total Storage capacity of the storage system = 2.4 m3.

15. In a carousel storage system, the overall rail length = 20 m and width = 0.5 m. How much will be the circumference of the overall rail?
a) 39.75 m
b) 19.5 m
c) 40.5 m
d) 39.5 m

Explanation: Given, Length of the rail = 20 m
Width = 0.5 m
To Find: Circumference of the rail
Solution: Circumference of the overall rail = 2 (Length – Width) + Width * π
= 2 (20 – 0.5) + 0.5 * π
= 40.5 m.

16. The circumference of a carousel rail is 15 m and the carousel speed is 5 m / min. Average Pick up and deposit time is 50 sec. How much will be the cycle time per retrieval?
a) 10 min
b) 5 min
c) 1.58 min
d) 15.8 min

Explanation: Given, Circumference of the carousel rail (C) = 15 m
Speed of the carousel = 5 m / min
Average pick up and deposit time = 50 sec
To Find: Cycle time per retrieval
Solution: Cycle time per retrieval = 15 / (4 * 5) + (50 / 60)
= 1.58 min.

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