Problem: Work Elements (Small electrical appliance)

No.	Element Description	Tej (min.)	Precedence
1	Place frame on work holder and clamp	0.2	--------
2	Assemble plug, grommet to power cord	0.4	---------
3	Assemble brackets to frame	0.7	1
4	Wire power cord to motor	0.1	1,2
5	Wire power cord to switch	0.3	2
6	Assemble mechanism plate to bracket	0.11	3
7	Assemble blade to bracket	0.32	3
8	Assemble motor to bracket	0.6	3,4
9	Align blade and attach to motor	0.27	6,7,8
10	Assemble switch to motor bracket	0.38	5,8
11	Attach cover, inspect and test	0.5	9,10
12	Place in tote pan for packing	0.12	11

Allowed to use any method.

Assume cycle time, Tc= 1min For the given element, draw a precedence diagram, calculate suitable no. of workstations, the line efficiency, balance delay and smoothness index.