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.