Thika tti iso certified

JANUARY 2021 INTAKE

MODULE 1

DIPLOMA IN MECHANICAL ENGINEERING (PRODUCTION B)

JANUARY 2021 INTAKE

Answer all questions in a separate answer sheet

QUESTION 1

1. State three metals used for sheet metal work and state the application for each. ( 6 marks )

-brass

-aluminium

1. With aid of a sketch explain the function of a Trammel point ( 4 marks )
2. With aid of a sketch, explain Drawing as applied to sheet metal operation ( 6 marks ) application QUESTION 2

a) Sketch the following types of seams used in sheet metal and state the application for each

• Dovetail seam-used to join sections such as one pipe to another pipe or a sheet to a pipe.
• Flanged seam-used to join the bottom of a container to its body.
• Lap seam-is a seam which consists of lapping the edge of one sheet over the other and the joint is made of soldering or rivetting ( 6 marks )

THIKA TTI ISO 9001:2008 CERTIFIED

1. State three metals used for sheet metal work and state the application for each. ( 6 marks )

-galvanized iron

-stainless steel

-lead

1. With aid of a sketch explain the function of a Trammel point ( 4 marks )
2. With aid of a sketch, explain Drawing as applied to sheet metal operation ( 6 marks ) application QUESTION 2

• Dovetail seam-used to join sections such as one pipe to another pipe or a sheet to a pipe.
• Flanged seam-used to join the bottom of a container to its body.
• Lap seam-is a seam which consists of lapping the edge of one sheet over the other and the joint is made of soldering or rivetting ( 6 marks )

c) Figure 1 shows a truncated cylinder. Sketch its surface development using parallel line method

(6 marks)

Fig. 1