MD Terms 1 PDF Past Paper

ELEMENTS MULTIPLE CHOICE 1. This radial distance in a gear is measured between the addendum and dedendum circle, and is the sum of the addendum and the dedendum? How do you call this distance? a. Addendum c. Working depth b. Who...

ELEMENTS MULTIPLE CHOICE 1. This radial distance in a gear is measured between the addendum and dedendum circle, and is the sum of the addendum and the dedendum? How do you call this distance? a. Addendum c. Working depth b. Whole depth d. Space width ANS: B PTS: 1 2. This minimum distance is measured between the non-driving side of a tooth and the adjacent side of the mating tooth. It is the amount by which the width of a tooth space exceeds the thickness of the engaging tooth measured on the pitch circle. What is this distance? a. Circular pitch c. Backlash b. Whole depth d. Space width ANS: C PTS: 1 3. How do you call the diameter of the imaginary cylinder that bounds the crest of an external thread and the roots of an internal thread? a. Mean diameter c. Minor diameter b. Stress diameter d. Major diameter ANS: D PTS: 1 4. How do you call the circle on a gear that corresponds to the contact surface of the friction wheel? a. Addendum circle c. Pitch circle b. Root circle d. Base circle ANS: C PTS: 1 5. What is the largest roller chain size that can be used for power transmission at a sprocket speed of 1000 rpm? a. RC 35 c. RC 80 b. RC 50 d. RC 60 ANS: D PTS: 1 6. These are gears with teeth formed on conical surfaces and are used mostly for transmitting motion between intersecting shafts. How do you call these gears? a. Spur gears c. Helical gears b. Bevel gears d. Worm gearings ANS: B PTS: 1 7. For an American Standard Screw Threads, what does 6-32 UNC designate? a. Size 6, 32 threads per inch, coarse thread c. 6 inches basic diameter, 32 threads per inch, coarse thread b. Size 6, 32 threads per inch, fine thread d. 32 inches basic diameter, 6 threads per inch, coarse thread ANS: A PTS: 1 8. In gearing, this is the ratio of the arc of action to the circular pitch. a. Speed ratio c. Contact ratio b. Arc ratio d. Gear ratio ANS: C PTS: 1 1  9. This are gears used to connect shafts that are non-intersecting and non-parallel. They are a cross between spriral bevel gears and worm gears. a. Helical gears c. Planetary gears b. Hypoid gears d. Bevel gears ANS: B PTS: 1 10. AFBMA is an acronym for an association involved in what machine elements? a. Ball and roller bearings c. Flat belts and other belt types b. Journal bearings d. Any type of gears ANS: A PTS: 1 11. It is a machine member that supports another part that rotates, slides, or oscillates in or on it. a. Pulley c. Bearing b. Key d. Shaft ANS: C PTS: 1 12. It is a bearing that permits constrained relative motion of rigid parts; lubricant is generally inserted or supplied between the mating surfaces to reduce friction and wear, and to carry away the heat generated. a. Sliding Contact Bearing c. Thrust Bearing b. Rolling Contact Bearing d. Journal Bearing ANS: A PTS: 1 13. A bearing where surfaces are non-conformed and motion is primarily rolling; it composed of rolling elements interposed between an outer ring and inner ring. a. Conformal surfaces bearing c. Rolling-element bearing b. Sliding-element bearing d. Non-conformal surfaces bearing ANS: C PTS: 1 14. In a straight bevel gear, how do you call the angle between an element on the pitch cone and an element on the face cone? a. Face angle c. Addendum angle b. Pitch angle d. Dedendum angle ANS: C PTS: 1 15. It is a Grashof four-bar mechanism in which the shortest link is the frame or fixed link and the other two cranks completely rotate with their axes. How do you call this Grashof four-bar mechanism? a. Drag-link mechanism c. Triple-rocker mechanism b. Double-rocker mechanism d. Crank-rocker mechanism ANS: A PTS: 1 16. “For a planar four-bar linkage, the sum of the shortest and longest lengths cannot be greater than the sum of the remaining two link lengths if there is to be a continuous relative rotation between two members.” How do you call the preceding statement? a. Grubler’s Law c. Grashof’s Law b. Coriolli’s Law d. Freudentein’s Law ANS: C PTS: 1 17. Which of the following is not true for an instant center or centro of planar linkages? a. Centro is a point common to two bodies c. Centro is a point in one body about which having the same velocity in each. another body actually turns. b. Centro is a point in one body about which d. Centro is a point in one body about which another body does not rotate. another body tends to turn. ANS: B PTS: 1 2 18. An element assembled into a tapped hole is a. key c. screw b. nut d. worm gear ANS: C PTS: 1 19. In kinematics, the occurrence of linear and rotational motion simultaneously is known as a. mechanism c. corioli’s b. rotakinetics d. Grashof’s ANS: C PTS: 1 20. The ratio of the number of teeth to the pitch diameter is a. circular pitch c. diametral pitch b. mechanical advantage d. Lewi’s form factor ANS: C PTS: 1 21. The radial distance between the bottomland and the pitch circle is a. clearance c. addendum b. dedendum d. working depth ANS: B PTS: 1 22. Is largely used for low strength applications such as elevator ropes not used to hoisting and for stationary guy ropes a. steel rope c. nylon rope b. cast steel rope d. iron wire rope ANS: D PTS: 1 23. In actual machines a. Mechanical advantage is unity c. Mechanical advantage is less than velocity ratio b. Mechanical advantage is less than unity d. Mechanical advantage is equal to velocity ratio ANS: C PTS: 1 24. Used for permanent fits, are similar to involute splines except that the pressure angle is 14.50 a. separation load c. spline shaft b. stub serrations d. involute serrations ANS: D PTS: 1 25. A gear that has an advantage of smoother engagement, quietness of operation, greater strength and higher permission speeds a. zerol bevel gear c. hypoid bevel gear b. straight bevel gear d. spiral bevel gear ANS: D PTS: 1 3 26. The amount of which the width of a tooth space exceeds the thickness of engaging tooth is known as a. tooth space c. backlash b. circular pitch d. flank ANS: C PTS: 1 27. Tooth breakage on gear is usually ______. a. a tensile fatigue c. a crack b. a contact stress d. none of these ANS: A PTS: 1 28. Is the angle through which the gear turns form the time given pair of teeth are in contact at the pitch point until they pass out the mesh a. angle of contact c. position angle b. angle of approach d. angle of recess ANS: D PTS: 1 29. Which of the following quick return mechanism is most widely used in most of the slotters a. Whitworth mechanism c. Slotter disc mechanism b. Hydraulic mechanism d. Slotter link and gear mechanism ANS: A PTS: 1 30. The axial distance between specified reference on the internal and external taper thread members a. pitch c. standoff b. load d. helix distance ANS: C PTS: 1 31. The relation between two mating parts with reference to ease the assembly is called a. allowance c. tolerance b. clearance d. fits ANS: D PTS: 1 32. In a duplex reciprocating pump: a. the slide valve for the one cylinder is c. each slide valve is controlled by its own controlled in the piston of the other cylinder piston rod b. both slide valves operate simultaneously d. one slide valve operates the other slide valve ANS: A PTS: 1 33. Heating above the transformation range, usually 1300F to 1350F, and cooling slowly to soften the metal and increase in machining. a. Annealing b. Hardening c. Normalizing d. Tempering ANS: A PTS: 1 4 34. Reheating to a temperature below the transformation range, followed by any desired rate of cooling to attain the desired properties of the metal. a. Annealing b. Hardening c. Normalizing d. Tempering ANS: D PTS: 1 35. Heating to some 100F above the transformation range with subsequent cooling to below that range in still air at room temperature to produce uniform structure of the metal. a. Annealing b. Hardening c. Normalizing d. Tempering ANS: D PTS: 1 36. Process of forming a metal parts by the use of a powerful pressure from a hammer or press to obtain the desired shape, after the metal has been heated to its plastic range. a. Rolling b. Forging c. Turning d. Casting ANS: B PTS: 1 37. Ability of metal to be deformed considering without rupture. a. Ductility b. Plasticity c. Malleability d. Elasticity ANS: D PTS: 1 38. The operation of cooling a heated piece of work rapidly by dipping it in water, brine or oil. a. Quenching b. Tempering c. Normalizing d. Annealing ANS: A PTS: 1 39. The process of heating a piece of steel to a temperature within or above critical range and cooling rapidly. a. Normalizing b. Hardening c. Annealing d. Tempering ANS: B PTS: 1 40. The moment of inertial of a rectangle whose base is b and height h about its base is: a. (bh^3)/12 b. (bh^3)/3 c. bh/36 d. bh/24 ANS: A PTS: 1 41. A stainless steel is obtained by the use of the following alloying element. a. Chromium b. Tungsten c. Carbon d. Phenol ANS: A PTS: 1 42. An alloy of copper and zinc a. Chromium b. Brass c. Cast Iron d. Aluminum ANS: B PTS: 1 5 43. It is a hardening treatment whereby a cast material is being heated to a very high temperature then suddenly subjected to rapid cooling to improve hardenability or wear resistance is called: a. normalizing b. tempering c. annealing d. quenching ANS: D PTS: 1 44. Unit deformation is also called a. Torsion b. Strain c. Stresss d. Sprain ANS: B PTS: 1 45. Machine used for testing of very thin steel or surface layers. a. Charpy b. Izod c. Description d. Rockwell ANS: D PTS: 1 46. Corrosion of iron or iron-based alloys: a. Rusting b. Crazing c. Chalking d. Fritting ANS: A PTS: 1 47. Change in length per unit length is: a. Strain b. Stress c. Deformation d. Tensile Strength ANS: A PTS: 1 48. The maximum stress which is reached during tensile testing. a. stress b. elasticity c. strain d. tensile strength ANS: D PTS: 1 49. Most abundant engineering material: a. Steel b. Babbitts c. Aluminum d. Cast Iron ANS: D PTS: 1 50. Machine used in testing steel generally strike the speciman from 220 to 265 ft – lb. a. Izod Test b. Charpy Test c. White Iron d. Malleable Iron ANS: C PTS: 1 51. Ability of a metal to resist being crushed. a. fatigue strength b. Bending strength c. Torsional strength d. Compressive Strength ANS: D PTS: 1 6 52. Ferrous metals contain a relatively large amount of: a. Manganese b. Carbon c. Sulfur d. Phosphorus ANS: B PTS: 1 53. A flange coupling is: a. Used for collinear shaft b. Used for non-collinear shaft c. Rigid coupling d. Flexible flange ANS: A PTS: 1 54. Ability of metal to stand loads without breaking down. a. Strain b. Stress c. Elasticity d. Strength ANS: D PTS: 1 55. An alloy of tin, copper and a traced amount of phosphorous. a. Chromium b. Bronze c. Brass d. Aluminum ANS: B PTS: 1 56. This material is the most popular alloy spring steel for conditions involving higher stresses than can be used with the high-carbon steels and for use where fatigue resistance and long endurance are needed; this is also good for shock and impact loads. a. Chrome silicon b. Chrome vanadium c. hard-drawn wire d. Oil-tempered wire ANS: B PTS: 1 7