MECH 220 Final, Fall 2010

AMERICAN UNIVERSITY OF BEIRUT FACULTY OF ENGINEERING & ARCHITECTURE Inst. Charbel Seif FALL 2005-2006 MECH320: Introduction to Engineering CAD Final Exam CLOSED BOOK / OPEN MIND 60 Minutes January 24, 2006 Please sign and date this front sheet PRIOR to working on this test. I, the undersigned, and in the process of taking this test, pledge that I (1) will conduct myself in a professional manner (2) will not communicate with other examinees regarding the subject-matter of this test while this test is in progress and will ONLY communicate with the teacher administering this test. (3) will use only what is handed to me with the exception of a calculator & pens (4) acknowledge that I am familiar with FEA’s “Rules and Regulations on Disciplinary Action” and understand that in case of policy violation, that I, myself, will be responsible for the consequences of my actions. STUDENT NAME ____________________________ STUDENT ID ____________________________ STUDENT SIGNATURE ____________________________ DATE ____________________________ 1 ALL QUESTIONS ARE GRADED EQUALLY; ONE (1) POINT EACH. VERSION A 1. What is the version of your question sheet? a- A b- B DRAWING FORMAT: 2. Which of the following international regulatory bodies does NOT specify standard drawing formats? a- ANSI b- DIN c- JIS d- ISO e- None of the above 3. Which of the following does NOT describe a drawing or its intended use? a- a drawing is a formatted document b- a drawing specifies the required attributes of a part to be manufactured c- a drawing is a collection of data that reflects the design intent of the designer d- a drawing should stand on its own as far as completeness is concerned e- none of the above 4. Which of the following is NOT a geometric attribute? a- Dimension b- Flatness c- Squareness d- Tolerance e- None of the above 5. The following callout “Obey tolerance block for dimensional tolerances unless otherwise specified. “ was placed on the drawing in the miscellaneous notes callout. This is the proper location for this callout. a (TRUE) b (FALSE) 6. Where on a drawing format should a callout such as “Apply Chromate coating Class II prior to painting black (color chip xxx-xx) polyurethane (Dow Chemical p/n xxxxx)” be placed? a- Main Block b- Revision Block c- Miscellaneous Notes d- None of the above DIMENSIONING AND TOLERANCING 7. Which of the following documents govern basic American mechanical drawing formats as well as specifying proper dimensioning and tolerancing? a- ASTM Publication Y15.4 b- ANSI Publication Y14.5 c- ISO 9001 d- ISO 14001 e- None of the above 2 8. The following tolerance limits are placed on a nominal dimension so that the tolerancing scheme meets “Unilateral Dimensioning”: 1.00” +/- 0.001” a (TRUE) b (FALSE) 9. The following dimensions are all equivalent: 16 ½” 16.50” 1’ 4 1/2” 1.650 E+01 in. a (TRUE) b (FALSE) 10. Considering the ‘anatomy of a dimension’, the arrow marked with an asterisk dimensions points to the ‘dimension line’. a (TRUE) b (FALSE) 11. The following is a shape & size dimension for a counterbore: a (TRUE) b (FALSE) 12. On a drawing, the dimensional tolerance should be set by the: a. design engineer b. drafter c. fabricating shop d. none of the above e. any of the above 13. If a dimension value appears on a drawing without tolerances, then this dimension obeys the general tolerance scheme. For a dimension value that appears on a drawing as 1.27” and if the title block’s tolerance specifies that: 0.X” = +/-0.1” 0.XX” = +/-0.02” 0.XXX” = +/-0.003” Then the dimension is allowed to vary between a low of 1.25” and high of 1.29”. a (TRUE) b (FALSE) 14. The acceptable drawing symbol for representing a countersunk hole is a (TRUE) b (FALSE) 3 16. This is a proper method to dimension a circle. a (TRUE) b (FALSE) 17. Given the choice between the two views shown: front view (marked ‘a’) and the side view (marked ‘b’) which of the two views is the better choice to place the vertical dimensions? a. front view b. side view c. either view 18. When using parallel dimensioning each dimension stands alone, not relying on any other dimension for reference. a (TRUE) b (FALSE) 19. This view shows a proper use of a leader in a drawing. a (TRUE) b (FALSE) 20. The main disadvantage of ordinate dimensioning is potential crowding around fine features. a (TRUE) b (FALSE) VIEWS 21. The SECTION VIEW shown opposite is an honest representation of the part when using the straight plane shown on top view. a (TRUE) b (FALSE) 4 22. The section view shown opposite is an honest representation of the part when using the offset plane shown on top view. a (TRUE) b (FALSE) 23. Shown is a proper offset plane to create a section view. a (TRUE) b (FALSE) 24. It is perfectly proper to use a partial broken-out section view in a drawing. a (TRUE) b (FALSE) 25. The following cross hatch represents steel materials. a. (TRUE) b (FALSE) DRAWING SYMBOLS: THREADED FASTNERS 26. On threaded fasteners, the pitch represents the number of threads per inch. a (TRUE) b (FALSE) 27. A bolt passes through clearance hole in one piece and screws into a tapped hole in the other. The head (an integral part of the screw) draws the parts together as the screw enters the tapped hole 5 a (TRUE) b (FALSE) 28. This sketch shows a hex head as viewed ‘across the flats’. a (TRUE) b (FALSE) 6