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Eme 2102: Workshop Practice 1 Question Paper

Eme 2102: Workshop Practice 1

Course:Bachelor Of Science In Electrical & Electronics Engineering

Institution: Dedan Kimathi University Of Technology question papers

Exam Year:2010

KIMATHI UNIVERSITY COLLEGE OF TECHNOLOGY
SUPPLEMENTARY EXAMINATIONS 2009/2010
FIRST YEAR EXAMINATIONS FOR THE DEGREE OF BACHELOR OF SCIENCE IN ELECTRICAL & ELECTRONICS ENGINEERING
EME 2102: WORKSHOP PRACTICE 1
DATE: 17TH MAY, 2010 TIME. 2.00 PM – 4.00 P.M.
INSTRUCTIONS
1. The paper has FIVE questions
2. Attempt QUESTION 1 and any other two questions
Question 1
a) State three design factors that should be considered when selecting a material for a twist drill (3 marks)
b) What is chipping? State four precautions to be observed when chipping (5 marks)
c) Compare and contrast a drilling machine and a milling machine (4 marks)
d) State and briefly explain the main five manufacturing processes in a mechanical workshop (5 marks)
e) What is an accident? State four ways in which accidents can be avoided when using the lathe machine (5 marks)
f) Name four factors that affect the weldability of a material (4 marks).
g) Differentiate between a single start and double start threads (2 marks)
h) State four characteristics of a good cutting fluid (2 marks)
Question 2
a) Describe any three ways dangerous parts of machine tools can be guarded (6 marks)
b) With the help of a neat diagram, show how a chain lap joint is made (4 marks)
c) Explain why most aluminium structures are riveted or screwed unlike steel structures which are welded (4 marks)
d) Briefly describe any three factors you would consider when choosing a machine tool for a machining process (6 marks)
Question 3
a) Specify the type of drilling machine suitable for the following operations and explain the design features which makes each of the machines suitable:
i. Several holes to be drilled at different locations on a large workpiece (3 marks)
ii. Mass productions in related operations such as holes of different sizes such as holes of different sizes, reaming or counter-boring on a single part (3 marks)
b) A 30 mm diameter high speed steel is used to drill a hole in a cast iron block 100 mm thick. Determine the machining time if the cutting sped is 20 meters per minute and the feed is 0.3 mm/rev. (4 marks).
c) Give at least three advantages of brazing compared to welding (3 marks)
d) With the help of neat diagrams describe the three types of flames that can be obtained in oxy-acetylene welding. Name at least one metal each flame is suitable for welding (7 marks)
Question 4
a) What is the fundamental difference between a shaper and a planer? State four safety precautions that should be observed when using the shaping machine. (5 marks)
b) Explain the functions of the following lathe accessories used in mounting and holding workpiece (6 marks)
i. Fixed steady
ii. Surface plate
iii. Mandrel
c) With aid of a neat diagram explain the principle of operation of the Auto collimator in measurement of angular dimensions (5 marks)
d) State any four objectives of work safety (4 marks)
Question 5
a) Briefly describe the two main types of chips produced when cutting a metal citing conditions that promote their production (6 marks)
b) State and briefly explain any three desirable properties of a cutting fluid (6 marks)
c) State any four factors that should be considered when selecting a grinding wheel (2 marks)
d) Name the three types of taps and their use in the tapping process (6 marks)
KIMATHI UNIVERSITY COLLEGE OF TECHNOLOGY
SUPPLEMENTARY EXAMINATIONS 2009/2010
FIRST YEAR EXAMINATIONS FOR THE DEGREE OF BACHELOR OF SCIENCE IN MECHATRONIC ENGINEERING
EMT 2103 WORKSHOP PROCESSES AND PRACTICE II
DATE: 17TH MAY, 2010 TIME. 2.00-4.00 PM
INSTRUCTIONS
3. The paper has FIVE questions.
4. Attempt QUESTION 1 and any OTHER TWO questions.
QUESTION 1
a) State the functions of the following electrode coating constituents (4 marks)
(i) Iron oxide
(ii) Sodium oxide
(iii) Graphite
(iv) Vanadium
b) Name four factors that affect the weldability of a material (4 marks).
c) Briefly describe four operations that can be carried out in a drilling machine (4 marks)
d) State three advantages of shell moulding over sand moulding (3 marks)
e) What is the fundamental difference between a shaper and a planning machine? State four safety precautions observed when using a shaper. (5 marks)
f) What is recrystallisation temperature? State three objectives of mechanical working of metals. (4 marks)
g) Briefly describe any three factors you would consider when choosing a machine tool for a machining process (6 marks)
Question 2
e) Specify the type of drilling machine suitable for the following operations and explain the design features which makes each of the machines suitable:
iii. Several holes to be drilled at different locations on a large workpiece (3 marks)
iv. Mass productions in related operations such as holes of different sizes such as holes of different sizes, reaming or counter-boring on a single part (3 marks)
f) A 30 mm diameter high speed steel is used to drill a hole in a cast iron block 100 mm thick. Determine the machining time if the cutting sped is 20 meters per minute and the feed is 0.3 mm/rev. (4 marks).
g) Give at least three advantages of brazing compared to welding (3 marks)
h) With the help of neat diagrams describe the three types of flames that can be obtained in oxy-acetylene welding. Name at least one metal each flame is suitable for welding (7 marks)
Question 3
a) Name the two types of twist drills. Briefly explain three design factors that would be considered when choosing a material for a twist drill (5 marks)
b) State the effects of the following mistakes when sharpening a twist drill (3 marks)
(i) Non-centred chisel edge
(ii) Flat drill point
(iii)Different lip angles
c) With the aid of neat diagrams, describe the following extrusion processes. (6 marks)
(i) Direct extrusion
(ii) Indirect extrusion
d) What is mechanical working of metals? (1 mark)
(i) State three objectives of mechanical working of metals. (3 marks)
(ii) State any four advantages of hot working of metals (2 marks)
Question 4
a) State any three advantages of casting manufacturing processes (3 marks)
b) Briefly describe the following foundry hand tools stating their use. (6 marks)
(i) Riddle
(ii) Rammer
(iii) Vent wire
c) Briefly describe the following cast defects stating their causes (6 marks)
i. Mould shift
ii. Hot tear
iii. Blow hole
d) With the aid of a neat diagram, show the main parts of a sand mould. Give the use of each of the parts labelled. (5 marks)
Question 5
a) Describe any three solid-state welding processes. (6 marks)
b) Briefly discuss any four non-destructive tests used to test welded joints (6 marks)
c) Explain why most aluminium structures are riveted or screwed unlike steel structures which are welded (4 marks)
d) With the help of a neat diagram, describe the process of submerged arc welding (4 marks)

Eme 2102: Workshop Practice 1 Question Paper

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