Candidates do not know the  accessories of a sewing machine. They confused it with parts of the sewing  machine.
                    The required answers to the  question are as follows:
                     2(a) (i)    Sewing  machine accessories
                      Zipper  foot/Piping foot/cording foot
    Embroidery  foot
    Invisible  zipper foot
    Gathering  foot
    Zigzag  foot
    Buttonhole  foot
    Overedge  foot
    Hemmer  foot
    Darner
    Ruffler
    Quilter
    Binder
                                  
   (ii)        Functions of sewing machine  accessories
                    -  Zipper/Piping foot/cord foot – for fixing zippers – for  stitching close a piping cord
                      -   Embroidery foot – for making embroidery on articles
                      -   Invisible zipper foot – for fixing invisible zippers
                      -   Gathering foot – gathers fabric and holds the gathering  rigidly in position
                      -   Zigzag foot – for neatening edges/for embroidery
                      -   Buttonhole foot – for making buttonhole
                      -   Hemmer foot – used to make very narrow hems on fine  fabrics.
                      -   Darner – Used for embroidery/darning
                      -   Ruffler – for pleating long lengths of fabric
                      -   Quilter – designed to hold layers of fabric together and  to be a guide for working even rows of machining
                      -   Binder – for binding.
                                (b)       Advantages and Disadvantages of sewing  machines
                                            Hand  sewing machine
                    
                      
                        | Advantages | Disadvantages | 
                      
                        | -     Easy to operate-     Suitable for a beginner
 -     Can be easily moved about
 -     Can be used anywhere, anytime
 -     It does not occupy much space
 -     It is less expensive compared to
 electric and treadle
 | -   Does not have variety of       stitches
 -   The worker has only one
 hand to operate
 -    Slow to use compared to
 treadle and electric
 -    It has limited functions
 | 
                    
                                            Treadle  Sewing Machine
                    
                      
                        | Advantages | Disadvantages | 
                      
                        | -    Bother hands are free to  manipulate work
 -    It is faster than the hand sewing
 machine
 -    Can be used anywhere anytime
 -     Some of the machine have tops
 that can be concerted and used
 as a work table
 | -   Cannot be carried about easily-  It is not suitable for a beginner
 -  It is slow compared to the electric
 machine
 -   It has limited functions compared
 to the electric machine
 -   It occupies much space
 -   It is more expensive than the
 hand sewing machine
 | 
                    
                                                                                                                                                        
                           Electric Sewing Machine
                    
                      
                        | Advantages
 | Disadvantages | 
                      
                        | -    It is faster than the hand and the          treadle machine
 -    It performs many functions
 -    Both hands are free to
 manipulate work
 -    Some do not occupy much
 space
 | -  Cannot be used where there is  no    electricity
 -   It is not suitable for a beginner
 -   It is expensive compared to
 treadle and hand machine.
 | 
                  
                    (c)        Straight  stitching using foot machine foot 
                    -           Keep the sides of a straight stitch presser foot level  with the seam line 
                      -           Watch the foot and not the needle
                      -           Keep the inner side of the small toe of the presser foot  level with the seamline/folder edge.