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Engineering Drawing Iii Question Paper
Engineering Drawing Iii
Course:Bachelor Of Science In Mechanical Engineering
Institution: Kenyatta University question papers
Exam Year:2008
KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2008/2009
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN MECHANICAL AND MANUFACTURING ENGINEERING, WATER AND ENVIRONMENTAL ENGINEERING, ENERGY ENGINEERING
SET 200: ENGINEERING DRAWING III
DATE: Monday, 24th November, 2008 TIME: 2.00 p.m. – 4.00 p.m.
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INSTRUCTIONS:
Question ONE is compulsory (30 marks)
Choose any TWO from the remaining FOUR (20 marks each)
Do not spend more than 1 hr per question
Q.1 The Front and end views of a bushed bearing bracket are shown in figure Q.1 in
3rd Angle:-
a) Draw the given front views and project from it; (10 marks)
b) a sectional end view and (10 marks)
c) a sectional plan view taken from cutting planes A – A and B – B, all in first Angle orthographic projection. (10 marks)
Q.2 An isometric view of a cast – iron bracket is given in figure Q.2. Draw a detail
working drawing for it that will be used to make it in a workshop. (20 marks)
Q.3 With the aid of simple sketches explain the following, giving the application of
each in toleranced workshop drawings:-
a) i) Non – critical Dimensions (NCD) and Blanket Tolerance Note
(BTN)
ii) Critical Dimensions (CD) and Maximum Material Condition Size(MMC).(4 marks)
b) Briefly show with simple drawings how the three tolerancing methods
work with critical Dimensions.
c) List the following information for each dimension shown in figure Q 4
i) Tolerance
ii) MMC size
iii) High Limit
iv) Low Limit
v) Tolerance method(6 marks)
d) With the exception of the thread diameter, all other diameters of the shaft
in figure Q3 (c) must have a tolerance of 0.01.
With the exception of the overall length covered by BTN given below, all other length dimensions have a tolerance of 0.15 and be dimensioned from the right end of the shaft according to the datum – line principle of dimensioning. Make a neat drawing to show how the Detail – Working drawing of the shaft should be dimensioned if the Direct method of indicating limit dimensions of each diameter is used.
TOLERANCES UNLESS SHOWN OTHERWISE
PLAIN – WHOLE NUMBERS 0.5
SINGLE – DECIMAL NUMBERS 0.2
ANGLES 0.5o
Q.4 A vertical support bracket is shown in figure Q 4 in 3rd angle projection. Draw
the following views using 1st or 3rd angle projection:-
a) The given plan
b) A sectional elevation on the plane xx
c) An elevation looking in the direction of arrow A without hidden details.
d) Add a title and scale, and the dimensions necessary for drilling the four holes in the base.
e) i) Show the machining symbols on the upper and lower faces of the
bracket and inside the 58.15 mm bore.
ii) State the projection angle used.
Q.5 a) Define the following terms used in limits and fits:-
i) Tolerance
ii) Actual size
iii) Basic size
iv) Nominal size
v) Limits of size
vi) Deviation
vii) Allowance
viii) Fit
ix) Tolerance grade
x) The maximum material condition
b) Determine the fit, and allowance for the following shafts and
holes:-
i) 50 H9 d10
ii) 50 H7 k6
iii) 50 H7 p6
In each case sketch the fit. Use the British standard data sheet BS4500A: for selected 150 fits – hole basis attached.
c) Figure Q.5 © shows a layout drawing for a system of pipes in
double – line drawing.Make a schematic SINGLE – LINE drawing
of it in symbol form.
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