Answer Happy

An electronics manufacturer makes remote control devices for
interactive-cable-TV systems. The following assembly tasks must be
performed on each device.
Task
Description
Predecessor(s)
Time (min.)
A
Place circuit into circuit frame
--
0.50
B
Solder circuit connections to central circuit control
A
0.70
C
Place circuit assembly in device frame
B
0.40
D
Attach circuit assembly to device frame
C
0.30
E
Place and attach display to frame
--
0.30
F
Place and attach keypad to frame
--
0.20
G
Place and attach top body of device to
frame
E, F
0.35
H
Place and attach battery holder to frame
D
0.40
I
Place and attach bottom body of device to
frame
G, H
0.60
J
Test device
I
0.30
Draw the precedence diagram for this problem, then determine the
following:
a. What is the sum of the task times?
[ Select ] ["4.67", "25.9",
"5.34", "4.05"] minutes
b. What cycle time will allow the production of 200 units over a
ten-hour day? [ Select
] ["3", "15", "3.9",
"1.78"] minutes
c. What is the theoretical number of workstations
needed? [ Select ]
["1", "3", "5", "2"]
d. What is the actual number of stations?
[ Select ] ["2",
"5", "3", "1"]
e. Was there an opportunity to improve the balance of the line
based on cycle time? [ Select
] ["no", "yes"] If so, what is
the new cycle time, idle time and efficiency?
[ Select ]
["3.0; 1.95; 67.5%", "same as the original calculation",
"2.8; 1.55; 72.3%", "3.2; 2.1; 55.6%", "2.5; 1.45;
83.7%"]
f. Based on your answer to e. what is the total idle time over
the 10 hour work day, in minutes?
[ Select ] ["1.95", "286.17",
"312.56", "332.14", "6.53"]