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Questions and Answers
What type of spring material is characterized by being hard drawn with an 80% reduction and made of high-grade steel?
What type of spring material is characterized by being hard drawn with an 80% reduction and made of high-grade steel?
Which spring material is recognized for its good quality in handling impact loads and moderately high temperatures?
Which spring material is recognized for its good quality in handling impact loads and moderately high temperatures?
What is the name for the type of coil spring that is formed into a circular helical coil?
What is the name for the type of coil spring that is formed into a circular helical coil?
Which spring is defined as a thin flat strip wound into a plane spiral, usually secured at one end?
Which spring is defined as a thin flat strip wound into a plane spiral, usually secured at one end?
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What is the term used to describe the ratio of the length of a column to the radius of gyration of its cross-section?
What is the term used to describe the ratio of the length of a column to the radius of gyration of its cross-section?
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How is a screw described that needs positive torque to lower a load?
How is a screw described that needs positive torque to lower a load?
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What is another name for the Kennedy key in mechanical applications?
What is another name for the Kennedy key in mechanical applications?
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What device is primarily used for accurately measuring speed?
What device is primarily used for accurately measuring speed?
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What is the primary function of Avogadro’s law in an applied context?
What is the primary function of Avogadro’s law in an applied context?
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Which type of fastener is specifically a bolt with a nut threaded onto it?
Which type of fastener is specifically a bolt with a nut threaded onto it?
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Which type of bolt is characterized by having a square or ribbed portion below the head?
Which type of bolt is characterized by having a square or ribbed portion below the head?
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What is the capacity of a material to absorb energy when deformed elastically and then increase this energy upon unloading?
What is the capacity of a material to absorb energy when deformed elastically and then increase this energy upon unloading?
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What is the typical application of brazing in metalworking?
What is the typical application of brazing in metalworking?
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What term refers to the strain energy per unit volume needed to stress a material from an unloaded state to the yielding point?
What term refers to the strain energy per unit volume needed to stress a material from an unloaded state to the yielding point?
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What is the recommended initial tension for rubber belts in mechanical applications?
What is the recommended initial tension for rubber belts in mechanical applications?
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Which property describes the ability of a material to absorb energy up to the point of fracture?
Which property describes the ability of a material to absorb energy up to the point of fracture?
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What is the typical normal stress relieving temperature range for cast iron?
What is the typical normal stress relieving temperature range for cast iron?
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Which of these mechanisms consists of two chain sprockets connected by a roller chain?
Which of these mechanisms consists of two chain sprockets connected by a roller chain?
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What is another term for the Maximum-Shear-Stress Theory in predicting material failure?
What is another term for the Maximum-Shear-Stress Theory in predicting material failure?
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This failure prediction theory states that a part under any load combination will fail when maximum shear stress exceeds a critical value. What is this theory called?
This failure prediction theory states that a part under any load combination will fail when maximum shear stress exceeds a critical value. What is this theory called?
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Which material, developed commercially in the late 1940s, is known for its corrosion resistance and high strength?
Which material, developed commercially in the late 1940s, is known for its corrosion resistance and high strength?
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Which theory in cyclic and impact loading indicates that damage is proportional to the number of cycles at any stress level?
Which theory in cyclic and impact loading indicates that damage is proportional to the number of cycles at any stress level?
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What is the lubrication type that prevents metal-to-metal contact by using a thick film of lubricant, supported by fluid mechanics?
What is the lubrication type that prevents metal-to-metal contact by using a thick film of lubricant, supported by fluid mechanics?
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What is the term for the speed at which a rotating shaft becomes dynamically unstable?
What is the term for the speed at which a rotating shaft becomes dynamically unstable?
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Study Notes
Machine Design/Shop Practice - IBONG TIRIRIT (MDSP 2)
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Problem 1: Select a deep-groove ball bearing for a radial load of 800 lb and a thrust load of 700 lb at 1800 rpm, with 8 hours/day service, not continuous, for 18,250 hours. Determine the design life (in million revolutions) with no more than 10% failure.
- Options: 1791 mr, 1971 mr, 1197 mr, 1917 mr
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Problem 2: Ultimate shear strength of steel plates is 42,000 psi. Find the force needed to punch a 0.75-inch diameter hole in a 0.625-inch thick plate.
- Options: 61,850 lb, 65,810 lb, 61,580 lb, 60,185 lb
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Problem 3: Find the pressure to punch a 1-inch square hole in a 0.5-inch thick steel plate.
- Options: 20.67 tons, 26.76 tons, 26.67 tons, 26.67 tons
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Problem 4: Find the length of a square key for a 4-inch diameter shaft transmitting 1000 hp at 1000 rpm. Allowable shear stress is 15 ksi, compressive stress is 30 ksi.
- Options: 2.1 inches, 2.8 inches, 3.2 inches, 4.2 inches
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Problem 5: A flange coupling transmits 15,000 in-lb between two 2.5" diameter shafts. How many 0.5" diameter bolts in a 6" diameter bolt circle are required if the shear stress in each bolt is limited to 3000 psi?
- Options: 9 bolts, 7 bolts, 6 bolts, 8 bolts
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Problem 6: Calculate the radius of gyration for a wheel with an outside diameter of 1 meter and an inside diameter of 0.75 meter. Neglect arms and hub.
- Options: 0.5125 m, 0.6125 m, 0.3125 m
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Problem 7: Find the polar section modulus of a solid 101.6 mm diameter shaft.
- Options: 209.5 cm³, 209.5 cm², 205.9 cm³, 205.9 cm²
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Problem 8: Angular deformation of a solid shaft should not exceed 1º in 1.8 m. Allowable shearing stress is 83 MPa, with G = 77 x 10⁶ kPa. Find the diameter of the shaft.
- Options: 222.34 mm, 234.22 mm, 23.42 cm, 24.22 cm
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Problem 9: Find the modulus of elasticity (in tension) required to obtain a unit deformation of 0.00105 from a load producing a unit tensile stress of 3163.27 kg/cm².
- Options: 40 x 10⁶ psi, 43 x 10⁶ psi, 45 x 10⁶ psi, 46 x 10⁶ psi
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Problems 10 and 11 are duplicates asking for the force required to punch a 0.75" diameter hole in a 0.625" thick plate, using 42,000 psi shear strength.
- Options for both: 61,850 lb, 65,810 lb, 61,580 lb, 60,185 lb.
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Problem 12: Determine the tensile stress area of an American Standard Screw Threads 6-32 UNC with a basic major diameter of 0.1380 inch.
- Options: 9.085 x 10⁻³ in², 9.085 x 10⁻² in², 9.085 x 10⁻⁴ in², 9.085 x 10⁻⁵ in²
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Problem 13: Find the diameter of a line shaft transmitting 200 hp at 900 rpm.
- Options: 2.18 inches, 2.28 inches, 3.18 inches, 3.28 inches
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Problem 17: Determine the horsepower lost when a collar is loaded with 2000 lb, rotates at 50 rpm, and has a coefficient of friction of 0.15. The outside diameter of the collar is 4 inches and the inside diameter is 2 inches.
- Options: 0.7314 Hp, 0.3714 Hp, 0.4713 Hp, 0.4371 Hp
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Problem 19: Find the bursting pressure of a hemispherical steel shell with a 100-inch diameter and 0.0635-m thick steel plate, with 70% joint efficiency and 60,000 psi tensile strength.
- Options: 4020 psi, 4200 psi, 2400 psi, 2040 psi
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Many other problems concerning machine design and shop practice calculations are presented
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Description
Test your knowledge in machine design with this quiz focusing on key problems related to bearings, shear strength, and punching force calculations. Each question presents a real-world scenario, requiring you to apply theoretical principles to practical situations. Challenge yourself and see how well you understand the concepts in this essential field.
