問題一覧
1
1. To avoid excessive wear rate the recommended limiting pressure for 6x19 rope is_____for cast steel
C. 900 psi
2
2. A helical gear having 20 teeth and pitch diameter of 5 in. Find the normal diametral pitch if helix angle is 22 degrees.
B. 4.31
3
3. A shaft has an ultimate stress of 350 Mpa and has a factor of safety of 5. The torque developed by the shaft is 3KN-m and the diameter outside is 80mm. Find the inside diameter of the shaft.
C. 69.62mm
4
4. A certain farm equipment which requires 2200 N-m torque at 500 rpm has diesel engine to operate at 1500 rpm as its prime mover. A no. 60 roller chain with total length of 60 pitches and a small sprocket of 23 teeth are to be used with operating temperature to remain constant at 45°C. Determine the number of teeth of larger sprocket.
D. 69
5
5. A chain and sprocket has 24 teeth with chain pitch of 1/2 in. If the sprocket turns at 600rpm, find the speed of chain
A. 601.72fpm
6
6. What is the polar moment of inertia of a solid shaft that has a torque of 1.5KN and a stress of 25Mpa?
B. 2.02x10-m
7
7. A 5mm steel wire is 16.4 ft long and stretches 8mm under a given load. If modulus of elasticity is 200 Gpa, find the load applied.
B. 9 KN
8
8. Experience suggest that the most economical designs are obtained for a belt speed of
A. 4000 to 4500 fpm
9
9. A wire rope that the wires and strands are twisted in the same direction
B. lang lay
10
10. Find the diameter of a steel shaft which will be used to operate a 396000 kJ/hr motor rotating at 5rps if torsional stress is 90 Mpa.
B. 2.3 in
11
11. A 70mm diameter shafting of SAE 1040 grade, cold rolled, having a yield point of 52 ksi and x%x4 inches key. Compute the minimum yield point in the key in order to transmit the torque of the shaft. The
factor of safety is 3.
A. 357 mPa
12
12. A steel wire 10m long, hanging vertically supports a tensile load of 2KN. Neglecting the weight of wire, determine the required diameter if the stress is not to exceed 140 Mpa and the total elongation is not to exceed 5mm. Assume E 200 Gpa.
A. 5 mm
13
13. The power required to shear a plate 50mm thick for 10sec is 5kw. If ultimate strength of plate materials is 420 Mpa, how wide should the plate be?
D. 95.23mm
14
14. A double thread worm gear has a lead angle of 7.25 degrees and pitch radius of 2 in. Find the pitch of the worm.
C. 1 in
15
15. A 2 inches diameter main shaft running at 600rpm is mounted by a 12 inches diameter pulley and is then connected to the shaft of driven machine mounted by a 40 inches diameter pulley by means of a belt. The belt efficiency is 90%. Find the diameter of the short shaft
C. 2.25inches
16
16. Four cylinders rolling in opposite directions has a speed ratio of A:B:C:D = 5:3:1:4. If center distance. between cylinder A and C is 70 inches, find the diameter of cylinder D.
A. 476.25 mm
17
17. A 1.5" diameter short shaft is used to transmit 44.4hp. Determine the shaft speed.
B. 8.33rps
18
18. A 19mm stud bolts is used to fastened on a 250mm diameter cylinder head of diesel engine. If there are 10 stud bolts, determine the pressure inside the cylinder if bolt stress is 50 Mpa.
B. 2888KPa
19
19. An engine of a motor vehicle with a wheel diameter of 712mm develops 50KW at 2,000rpm. The combined efficiency of the differential and transmission is 75% with an overall speed reduction of 25 is to 1. Determine the draw bar pull developed in kN..
C. 12.57
20
20. They are usually the steel or steel casting
B. carbon steel
21
21. A 900mm mean diameter flywheel has a width of 350mm, 75mm thick and density of 7100 kg/m³. Neglecting the weight of arm and hub, find the energy released if its speed changes from 280rpm to 250rpm.
D. 9.3 kJ
22
22. A 7/16" height x 3" length flat key is keyed to a 2 inches diameter shaft. Determine the torque developed in key if bearing stress allowable is 25 ksi.
A. 16,406.25 in-lb
23
23. Poisson's ratio is the ratio of
b. Lateral deformation to the longitudinal deformation
24
24. A 1.5" diameter short shaft is used to transmit 44.4hp. Determine the shaft speed.
B. 8.33rps
25
25. The stress area of UNC bolt is 5 cm³, if material used is alloy steel, determine the applied load on the bolt.
D. 10450.01 lbs
26
26. Determine the diameter of bolt needed to tightly packed the joint is bolt working strength is 90.76KN and working s stress is 82.71Mpa.
D. 2.0in
27
27 . A flange coupling having 180mm bolt circle and 19mm thick uses 8 bolts, 16mm diameter to connect two shafts. It is use to transmit 60KW at 180rpm. Determine the factor of safety in bearing if yield point in compression is 448Mpa.
C. 30.8
28
28. Determine the diameter of bolt needed to tightly packed the joint is bolt working strength is 90.76KN and working s stress is 82.71Mpa.
D. 2.0in
29
29. A double thread Acme screw driven by a motor at 400rpm raises the attached load of 900kg at a speed of 10 meters per minute. The screw has a pitch diameter 36mm. The coefficient of friction on threads is 0.15. The friction torque on the thrust bearing of the motor is taken as 20% of the total torque input.. Determine the motor power required to operate the screw.
D. 4.34 Hp
30
30. A double square thread power screw has a mean radius of 80mm and a pitch of 10mm is used to lift a load of 80KN. If friction of screw is 0.13 and collar torque is 20% of input torque, determine the input torque required.
B. 1365.40 N.m
31
31. A double square thread power screw has a root diameter of 0.55 in. The screw has a pitch of 1/60 ft. Determine the major diameter.
B. 0,750in
32
32. A flywheel has a total weight of 750 kg and the weight of arm and hub is 10% of total weight. If it has a mean diameter of 1m and (weight) width of 300mm. Determine the thickness of the flywheel if density of material is 7000 kg/m³.
B. 102
33
33. A key that allows the hub to move along the shaft but prevents the rotation of the shaft.
B. Feather key
34
34. A coupling that transmits power via the frictional forces induced by pulling the flanges toward each other
D. flanged compression coupling
35
35. A power screw consumes 6hp in raising a 2800 lb weight at the rate of 30 ft/min. Determine the efficiency of the screw.
C. 42.42
36
36. Find the horsepower required to drive a power screw lifting a load of 4000lbs. A 2 and ½ in double square thread with two thread/inch is to be used. The frictional radius of the collar is 2 inches and the coefficients of friction are 0.10 for the thread and 0.15 for the collar. The velocity of the nut is 10 ft/min.
B. 4.395HP
37
37. A rectangular key is used in pulley connection to transmit 74,000 ft-lb/sec at 1000rpm on 2 in shaft diameter. Determine the force required to remove the shaft from the hub if f= 0.4.
A. 30.18KN
38
38. Shaft A with 12 inches diameter pulley running at 250rpm is connected to shaft 8 by means of 26 inches diameter pulley. Another pulley on shaft B 16 inches diameter is connected to 10 inches diameter pulley on shaft C. Find the speed of shaft C.
A. 184.61rpm
39
39. If you use a dry grinding wheel for sharpening tool bits, dip the end of the bit in water frequently to prevent:
B. Annealing the cutting edge of the bit
40
40. The distance between similar, equally-spaced tooth surfaces in a given direction and along a given line:
b. Pitch
41
41. A cable steel has a length of 100m and stretch to 5 cm when the load is applied at both ends. If tensile stress is 50 psi, find the modulus of elasticity of the steel.
A. 100,000 psi
42
42. The total force of 125000 N is required of flange coupling that has 5 bolts has also a shearing stress of 4300 psi for bolt. Determine the required bolt diameter.
B. 1.29 in
43
43. Four cylinders rolling in opposite directions has a speed ratio of A:B:C:D = 5:3:1:4. if center distance between cylinder A and C is 70 inches, find the diameter of cylinder D.
A. 18.75in
44
44. What factor of safety is needed for a 50.75 mm diameter shaft with an ultimate strength of 50,000 psi to transmit 40,000 in-lb tourque.
B. 1.95
45
45. An engine of a motor vehicle with a wheel diameter of 712mm develops 50KW at 2,000rpm. The combined efficiency of the differential and transmission is 75% with an overall speed reduction of 25 is to 1. Determine the torque to be delivered by the clutch in N-m.
A. 239
46
46. A flywheel has a rim weight of 1000 lbs and mean radius of 2 ft. If rim width is 5 times the rim thickness and material density is 7200 kg/m³, determine the width of flywheel.
C. 286.75 mm
47
47. How many ½ inch diameter hole that can be punch in one motion of a 1/8 inch thick plate using a force of 50 tons. The ultimate shear stress is 52 ksi and factor of safety of 3.
B. 9
48
48. A flat key is to be designed for 75mm diameter shaft which will transmit 200 Hp at 350 rpm. If allowable shearing stress is 29000 psi and key width is 15mm, determine the length of key.
B. 36.02 mm
49
49. A 1.5" diameter short shaft is used to transmit 44.4hp. Determine the shaft speed.
B. 500 rpm
50
50. What modulus of elasticity in tension is required to obtain a unit deformation of 0.00105 m/m from a load producing a unit tensile stress of 44,000 psi?
D. 41,905x10psi
51
51. The shaft of a motor has a length of 20 times its diameter and has a maximum twist of 1 degrees when twisted at 2 KN-m torque. If the modulus of rigidity of the shaft is 80 Gpa, find the shaft diameter.
D. 2.6 in
52
52. If the weight of 6" diameter by 48" long SAE 1030 shafting is 174.5 kg, then what will be the weight of chromium SAE 51416 of same size?
C. 384.6 lbs
53
53. A flange coupling is to be designed, using 25mm diameter bolts at a distance of 152mm from the center of the shaft. Allowable shearing stress on the bolt is 103Mpa. If the shaft is to transmit 5,800hp at a speed of 1,200rpm, how many bolts are needed in the connection?
D. 5
54
54. A steel tie rod on bridge must be withstand a pull of 6200 lbs. Find the diameter of the rod assuming a factor of safety of 4 and ultimate stress of 66,000 psi
C. 0.691in
55
55. A 19mm stud bolts is used to fastened on a 250mm diameter cylinder head of diesel engine. If there are 10 stud bolts, determine the pressure inside the cylinder if bolt stress is 50 Mpa.
B. 2888KPa
56
56. A steel of carbon range of 0.05 to 0.03 percent is considered what type of steel?
A. Low Carbon steel
57
57. A shaft is used to transmit 200 KW at 300 rpm by means of a 200 mm diameter sprocket. Determine the force tangent to the sprocket.
D. 14308.90 lbs
58
58. An iron rod 4m long and 5.38 x10^-4 ft² in cross section stretches 1mm when a mass of 225kg is hang on it. Compute the modulus of elasticity of the iron.
D. 2.56x10^7 psi
59
59 . A 20m rod stretches to a strain of 0.001in/in. Determine the deflection of the rod.
A. 20mm
60
60. A7/16" height x 3" length flat key is keyed to a 2 inches diameter shaft. Determine the torque developed in key if bearing stress allowable is 25 ksi.
A. 16,406.25 in-lb
61
61. Two cylinders rolling in the opposite direction has a speed ratio of 3. If the diameter of driver is 10 inches, find the center distance between cylinders.
D. 20in
62
62. The cheapest and the most abundant engineering material:
C. iron cast
63
63. A pair of bevel gear having a speed ratio of 3 has a 5-pitch at 14.5 deg involute. The pitch angle of the pinion is 3 in. Find the addendum angle of the pinion. (At right angle between shafts)
A. 0.906
64
64. The ratio of band extension in a band brake is 4. If angle of contact is 260 degrees, determine the coefficient of friction.
D. 0.30
65
65. A band brake has an angle of contact of 280 degrees and is to sustain a torque of 10,000 in-lbs. The band bears against a cast iron drum of 14 in diameter. The coefficient of friction is 0.30. Find the tension at the tight side.
A. 1,857.29 lbs
66
66. A disc clutch has 6 pairs of contacting friction surfaces. The frictional radius is 2 in and the coefficient of friction is 0.30. An axial force of 100 lb acts on the clutch. The shaft speed is 400 rpm. What is the power transmitted by the clutch?
B. 2.28HP
67
67. A cone clutch has cone elements at an angle of 12". The clutch transmit 25HP at a speed of 1200rpm. The mean diameter of the conical friction section is 16 in and the coefficient of friction is 0.35. Find the axial force needed to engage the clutch.
C. 258.04 lbs
68
68. A 3-strand chain and sprocket turns at 600 rpm has a service factor of 1.4. If 14 hp/strand chain is to be used, find the torque can the chain sprocket be deliver?
A. 262.61 ft-lb
69
69. A chain and sprocket has a pitch diameter of 9.56 in and a pitch of % in.
How many teeth are there in sprocket?
D. 40
70
70 . A column supports a compressive load of 56192.66. Determine the outside diameter of column if inside diameter is 185 mm and compressive stress of 50 Mpa.
A. 0.66 in
71
71. A 2 inches diameter main shaft running at 600rpm is mounted by a 12 inches diameter pulley and is then connected to the shaft of driven machine mounted by a 40 inches diameter pulley by means of a belt. The belt efficiency is 90%. Find the diameter of the short shaft.
C. 2.25inches
72
72. An 18 teeth sprocket driving with 98 teeth sprocket at a center distance of 34 pitches. Find the chain length in pitches,
A. 131
73
73. A flange bolt coupling consists of eight steel 20mm diameter steel bolts spaced evenly around a bolt circle. 300mm in diameter. If the coupling is subjected to a torque of 15.1 KN-m, determine the maximum shearing stress in the bolts.
C. 5810 psi
74
74. Atriple thread worm gear having a diametral pitch of 5 in is use to deliver a gear. The speed ratio is 10. Find the pitch line velocity of gear if the worm rotates at 600 rpm.
D. 94.25 fpm
75
75. A double thread worm gear having a pitch of 1 in and has a linear speed of 200 fpm. The pitch diameter of worm is 4 in. Find the tangential speed of the worm.
A. 1,256.64 fpm
76
76. Kevin bought a flange coupling with bolt circle diameter of 250mm uses 10 bolts, 25mm diameter. The torque transmitted is 15 KN-m and compressive stress of bolts is 15Mpa. Determine the required flange thickness.
B. 32mm
77
77. A single worm gear has a pitch diameter of 2 in and a pitch of 1in with coefficient of friction of 0.21. The normal angle is 14.5 degrees with tangential force on gear of 1000 lbs. Find the separation force on gear and worm considering a left hand threads.
B. 271.23 lbs
78
78. A pair of bevel gear having a speed ratio of 2 has 4-pitch at 14.5° involute. The pitch diameter of pinion is. 7 in. Find the dedendum angle of the gear.
B. 2.11 deg
79
79. A class 3 pinion bevel gear is made of alloy steel hardened to 300 Brinell. The pinion runs at 850 rpm with 5in pitch diameter. Find the gear stress at factor of safety 3.
A. 35,023psi
80
80. A helical gear having 20 teeth and pitch diameter of 5 in. Find the normal diametral pitch if helix angle is 22 degrees.
B. 4.31 in
81
81. For a single Hooke's coupling, the shaft angle should not be greater than about
B. 15°
82
82. A helical gear tangential load of 200 lbs and axial load of 73 lbs. Find the helix angle.
D. 20 degrees
83
83. Atriple thread worm has pitch diameter of 3 inches. The wheel has 25 teeth and a pitch diameter of 5 inches. Material for both the worm and the wheel is of phosphor bronze. Complete the helix angle..
A. 78.69
84
84. A 70mm diameter shafting of SAE 1040 grade, cold rolled, having a yield point of 52 ksi and Xx%x4 inches key. Compute the minimum yield point in the key in order to transmit the torque of the shaft. The factor of safety is 3.
A. 3632.93 kg/cm²
85
85. Compute the working strength of 1 % in bolt which is screwed up tightly in packed joint when the allowance working stress is 90,000 kPa,
A. 11,261.66 lbs
86
86. A bearing 2.085 inches in diameter and 1.762 in long supports a journal running at 1200rpm. It operates satisfactorily with a diametral clearance of 0.0028 in and a total radial load of 1,400 lbs. At 160°F operating temperature of the oil film, the bearing modulus ZN/P was found to be 16.48. Determine the viscosity, centipoises
B. 5.23
87
87. The main bearings of an engine are 152mm diameter and 280mm long and supports a load of 4400kg midway between the bearings. Find the bearing pressure in Kpa.
C.507
88
88. The tension ratio for a belt in a pulley with a 200 angle and a frictional coefficient of 0.3 is:
A. 2.85
89
89. A pulley 610mm in diameter transmits 40KW at 500rpm. The arc of contact between the belt and pulleys is 144 degrees, the coefficient of friction between belt and pulley is 0.35 and the safe working stress of the belt is 2.1 and the safe working stress of the belt is 2.1 Mpa. What is the effective belt pull in Newton.
A. 2,505N
90
90. For a bolted connection, specification suggests that a high grade material of 13 mm bolt be tightened to an initial tension of 55,000N. What is the appropriate tightening torque?
D. 143N-m
91
91. An eye bolt is lifting 500 lbs weight. The Su=70ksi and Sy=58ksi. What is the stress area of the bolt?
C. 0.1388in
92
92. A press is used to punch 10 holes per minute of 30mm diameter hole from 25m thick plate. Determine the power needed to punch a hole if ultimate shear stress is 400 Mpa.
B. 1.96KW
93
93. The kinetic energy needed to punch a hole is 5kj. What is the maximum thickness of hole that can be punched if hole diameter is 25mm and ultimate shear stress of plate is 420 Mpa.
C. 17.41mm
94
94.A triple thread worm gear is use to drive a 25 teeth gear having a pitch of % in. Find the center distance.
B. 3.34in
95
95. A rail having a coefficient of linear expansion of 11.6 x 10^-6 m/m-°C increases its length when heated from 70 °F to 113 °F. Determine the strain.
D. 2.77x10^-4
96
96. A flywheel has a rim weight of 1000 lbs and mean radius of 2 ft. If rim width is 5 times the rim thickness and material density is 7200 kg/m³, determine the width of flywheel.
C. 286.75 mm
97
97. How many ½ inch diameter hole that can be punch in one motion of a 1/8 inch thick plate using a force of 50 tons. The ultimate shear stress is 52 ksi and factor of safety of 3.
B. 9
98
98. A flat key is to be designed for 75mm diameter shaft which will transmit 200 Hp at 350 rpm. If allowable shearing stress is 29000 psi and key width is 15mm, determine the length of key.
B. 36.02 mm
99
99. A 1.5" diameter short shaft is used to transmit 44.4hp. Determine the shaft speed.
B. 500 rpm
100
100. What modulus of elasticity in tension is required to obtain a unit deformation of 0.00105 m/m from a load producing a unit tensile stress of 44,000 psi?
D. 41,905x100psi.
THERMO
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42問 • 1年前問題一覧
1
1. To avoid excessive wear rate the recommended limiting pressure for 6x19 rope is_____for cast steel
C. 900 psi
2
2. A helical gear having 20 teeth and pitch diameter of 5 in. Find the normal diametral pitch if helix angle is 22 degrees.
B. 4.31
3
3. A shaft has an ultimate stress of 350 Mpa and has a factor of safety of 5. The torque developed by the shaft is 3KN-m and the diameter outside is 80mm. Find the inside diameter of the shaft.
C. 69.62mm
4
4. A certain farm equipment which requires 2200 N-m torque at 500 rpm has diesel engine to operate at 1500 rpm as its prime mover. A no. 60 roller chain with total length of 60 pitches and a small sprocket of 23 teeth are to be used with operating temperature to remain constant at 45°C. Determine the number of teeth of larger sprocket.
D. 69
5
5. A chain and sprocket has 24 teeth with chain pitch of 1/2 in. If the sprocket turns at 600rpm, find the speed of chain
A. 601.72fpm
6
6. What is the polar moment of inertia of a solid shaft that has a torque of 1.5KN and a stress of 25Mpa?
B. 2.02x10-m
7
7. A 5mm steel wire is 16.4 ft long and stretches 8mm under a given load. If modulus of elasticity is 200 Gpa, find the load applied.
B. 9 KN
8
8. Experience suggest that the most economical designs are obtained for a belt speed of
A. 4000 to 4500 fpm
9
9. A wire rope that the wires and strands are twisted in the same direction
B. lang lay
10
10. Find the diameter of a steel shaft which will be used to operate a 396000 kJ/hr motor rotating at 5rps if torsional stress is 90 Mpa.
B. 2.3 in
11
11. A 70mm diameter shafting of SAE 1040 grade, cold rolled, having a yield point of 52 ksi and x%x4 inches key. Compute the minimum yield point in the key in order to transmit the torque of the shaft. The
factor of safety is 3.
A. 357 mPa
12
12. A steel wire 10m long, hanging vertically supports a tensile load of 2KN. Neglecting the weight of wire, determine the required diameter if the stress is not to exceed 140 Mpa and the total elongation is not to exceed 5mm. Assume E 200 Gpa.
A. 5 mm
13
13. The power required to shear a plate 50mm thick for 10sec is 5kw. If ultimate strength of plate materials is 420 Mpa, how wide should the plate be?
D. 95.23mm
14
14. A double thread worm gear has a lead angle of 7.25 degrees and pitch radius of 2 in. Find the pitch of the worm.
C. 1 in
15
15. A 2 inches diameter main shaft running at 600rpm is mounted by a 12 inches diameter pulley and is then connected to the shaft of driven machine mounted by a 40 inches diameter pulley by means of a belt. The belt efficiency is 90%. Find the diameter of the short shaft
C. 2.25inches
16
16. Four cylinders rolling in opposite directions has a speed ratio of A:B:C:D = 5:3:1:4. If center distance. between cylinder A and C is 70 inches, find the diameter of cylinder D.
A. 476.25 mm
17
17. A 1.5" diameter short shaft is used to transmit 44.4hp. Determine the shaft speed.
B. 8.33rps
18
18. A 19mm stud bolts is used to fastened on a 250mm diameter cylinder head of diesel engine. If there are 10 stud bolts, determine the pressure inside the cylinder if bolt stress is 50 Mpa.
B. 2888KPa
19
19. An engine of a motor vehicle with a wheel diameter of 712mm develops 50KW at 2,000rpm. The combined efficiency of the differential and transmission is 75% with an overall speed reduction of 25 is to 1. Determine the draw bar pull developed in kN..
C. 12.57
20
20. They are usually the steel or steel casting
B. carbon steel
21
21. A 900mm mean diameter flywheel has a width of 350mm, 75mm thick and density of 7100 kg/m³. Neglecting the weight of arm and hub, find the energy released if its speed changes from 280rpm to 250rpm.
D. 9.3 kJ
22
22. A 7/16" height x 3" length flat key is keyed to a 2 inches diameter shaft. Determine the torque developed in key if bearing stress allowable is 25 ksi.
A. 16,406.25 in-lb
23
23. Poisson's ratio is the ratio of
b. Lateral deformation to the longitudinal deformation
24
24. A 1.5" diameter short shaft is used to transmit 44.4hp. Determine the shaft speed.
B. 8.33rps
25
25. The stress area of UNC bolt is 5 cm³, if material used is alloy steel, determine the applied load on the bolt.
D. 10450.01 lbs
26
26. Determine the diameter of bolt needed to tightly packed the joint is bolt working strength is 90.76KN and working s stress is 82.71Mpa.
D. 2.0in
27
27 . A flange coupling having 180mm bolt circle and 19mm thick uses 8 bolts, 16mm diameter to connect two shafts. It is use to transmit 60KW at 180rpm. Determine the factor of safety in bearing if yield point in compression is 448Mpa.
C. 30.8
28
28. Determine the diameter of bolt needed to tightly packed the joint is bolt working strength is 90.76KN and working s stress is 82.71Mpa.
D. 2.0in
29
29. A double thread Acme screw driven by a motor at 400rpm raises the attached load of 900kg at a speed of 10 meters per minute. The screw has a pitch diameter 36mm. The coefficient of friction on threads is 0.15. The friction torque on the thrust bearing of the motor is taken as 20% of the total torque input.. Determine the motor power required to operate the screw.
D. 4.34 Hp
30
30. A double square thread power screw has a mean radius of 80mm and a pitch of 10mm is used to lift a load of 80KN. If friction of screw is 0.13 and collar torque is 20% of input torque, determine the input torque required.
B. 1365.40 N.m
31
31. A double square thread power screw has a root diameter of 0.55 in. The screw has a pitch of 1/60 ft. Determine the major diameter.
B. 0,750in
32
32. A flywheel has a total weight of 750 kg and the weight of arm and hub is 10% of total weight. If it has a mean diameter of 1m and (weight) width of 300mm. Determine the thickness of the flywheel if density of material is 7000 kg/m³.
B. 102
33
33. A key that allows the hub to move along the shaft but prevents the rotation of the shaft.
B. Feather key
34
34. A coupling that transmits power via the frictional forces induced by pulling the flanges toward each other
D. flanged compression coupling
35
35. A power screw consumes 6hp in raising a 2800 lb weight at the rate of 30 ft/min. Determine the efficiency of the screw.
C. 42.42
36
36. Find the horsepower required to drive a power screw lifting a load of 4000lbs. A 2 and ½ in double square thread with two thread/inch is to be used. The frictional radius of the collar is 2 inches and the coefficients of friction are 0.10 for the thread and 0.15 for the collar. The velocity of the nut is 10 ft/min.
B. 4.395HP
37
37. A rectangular key is used in pulley connection to transmit 74,000 ft-lb/sec at 1000rpm on 2 in shaft diameter. Determine the force required to remove the shaft from the hub if f= 0.4.
A. 30.18KN
38
38. Shaft A with 12 inches diameter pulley running at 250rpm is connected to shaft 8 by means of 26 inches diameter pulley. Another pulley on shaft B 16 inches diameter is connected to 10 inches diameter pulley on shaft C. Find the speed of shaft C.
A. 184.61rpm
39
39. If you use a dry grinding wheel for sharpening tool bits, dip the end of the bit in water frequently to prevent:
B. Annealing the cutting edge of the bit
40
40. The distance between similar, equally-spaced tooth surfaces in a given direction and along a given line:
b. Pitch
41
41. A cable steel has a length of 100m and stretch to 5 cm when the load is applied at both ends. If tensile stress is 50 psi, find the modulus of elasticity of the steel.
A. 100,000 psi
42
42. The total force of 125000 N is required of flange coupling that has 5 bolts has also a shearing stress of 4300 psi for bolt. Determine the required bolt diameter.
B. 1.29 in
43
43. Four cylinders rolling in opposite directions has a speed ratio of A:B:C:D = 5:3:1:4. if center distance between cylinder A and C is 70 inches, find the diameter of cylinder D.
A. 18.75in
44
44. What factor of safety is needed for a 50.75 mm diameter shaft with an ultimate strength of 50,000 psi to transmit 40,000 in-lb tourque.
B. 1.95
45
45. An engine of a motor vehicle with a wheel diameter of 712mm develops 50KW at 2,000rpm. The combined efficiency of the differential and transmission is 75% with an overall speed reduction of 25 is to 1. Determine the torque to be delivered by the clutch in N-m.
A. 239
46
46. A flywheel has a rim weight of 1000 lbs and mean radius of 2 ft. If rim width is 5 times the rim thickness and material density is 7200 kg/m³, determine the width of flywheel.
C. 286.75 mm
47
47. How many ½ inch diameter hole that can be punch in one motion of a 1/8 inch thick plate using a force of 50 tons. The ultimate shear stress is 52 ksi and factor of safety of 3.
B. 9
48
48. A flat key is to be designed for 75mm diameter shaft which will transmit 200 Hp at 350 rpm. If allowable shearing stress is 29000 psi and key width is 15mm, determine the length of key.
B. 36.02 mm
49
49. A 1.5" diameter short shaft is used to transmit 44.4hp. Determine the shaft speed.
B. 500 rpm
50
50. What modulus of elasticity in tension is required to obtain a unit deformation of 0.00105 m/m from a load producing a unit tensile stress of 44,000 psi?
D. 41,905x10psi
51
51. The shaft of a motor has a length of 20 times its diameter and has a maximum twist of 1 degrees when twisted at 2 KN-m torque. If the modulus of rigidity of the shaft is 80 Gpa, find the shaft diameter.
D. 2.6 in
52
52. If the weight of 6" diameter by 48" long SAE 1030 shafting is 174.5 kg, then what will be the weight of chromium SAE 51416 of same size?
C. 384.6 lbs
53
53. A flange coupling is to be designed, using 25mm diameter bolts at a distance of 152mm from the center of the shaft. Allowable shearing stress on the bolt is 103Mpa. If the shaft is to transmit 5,800hp at a speed of 1,200rpm, how many bolts are needed in the connection?
D. 5
54
54. A steel tie rod on bridge must be withstand a pull of 6200 lbs. Find the diameter of the rod assuming a factor of safety of 4 and ultimate stress of 66,000 psi
C. 0.691in
55
55. A 19mm stud bolts is used to fastened on a 250mm diameter cylinder head of diesel engine. If there are 10 stud bolts, determine the pressure inside the cylinder if bolt stress is 50 Mpa.
B. 2888KPa
56
56. A steel of carbon range of 0.05 to 0.03 percent is considered what type of steel?
A. Low Carbon steel
57
57. A shaft is used to transmit 200 KW at 300 rpm by means of a 200 mm diameter sprocket. Determine the force tangent to the sprocket.
D. 14308.90 lbs
58
58. An iron rod 4m long and 5.38 x10^-4 ft² in cross section stretches 1mm when a mass of 225kg is hang on it. Compute the modulus of elasticity of the iron.
D. 2.56x10^7 psi
59
59 . A 20m rod stretches to a strain of 0.001in/in. Determine the deflection of the rod.
A. 20mm
60
60. A7/16" height x 3" length flat key is keyed to a 2 inches diameter shaft. Determine the torque developed in key if bearing stress allowable is 25 ksi.
A. 16,406.25 in-lb
61
61. Two cylinders rolling in the opposite direction has a speed ratio of 3. If the diameter of driver is 10 inches, find the center distance between cylinders.
D. 20in
62
62. The cheapest and the most abundant engineering material:
C. iron cast
63
63. A pair of bevel gear having a speed ratio of 3 has a 5-pitch at 14.5 deg involute. The pitch angle of the pinion is 3 in. Find the addendum angle of the pinion. (At right angle between shafts)
A. 0.906
64
64. The ratio of band extension in a band brake is 4. If angle of contact is 260 degrees, determine the coefficient of friction.
D. 0.30
65
65. A band brake has an angle of contact of 280 degrees and is to sustain a torque of 10,000 in-lbs. The band bears against a cast iron drum of 14 in diameter. The coefficient of friction is 0.30. Find the tension at the tight side.
A. 1,857.29 lbs
66
66. A disc clutch has 6 pairs of contacting friction surfaces. The frictional radius is 2 in and the coefficient of friction is 0.30. An axial force of 100 lb acts on the clutch. The shaft speed is 400 rpm. What is the power transmitted by the clutch?
B. 2.28HP
67
67. A cone clutch has cone elements at an angle of 12". The clutch transmit 25HP at a speed of 1200rpm. The mean diameter of the conical friction section is 16 in and the coefficient of friction is 0.35. Find the axial force needed to engage the clutch.
C. 258.04 lbs
68
68. A 3-strand chain and sprocket turns at 600 rpm has a service factor of 1.4. If 14 hp/strand chain is to be used, find the torque can the chain sprocket be deliver?
A. 262.61 ft-lb
69
69. A chain and sprocket has a pitch diameter of 9.56 in and a pitch of % in.
How many teeth are there in sprocket?
D. 40
70
70 . A column supports a compressive load of 56192.66. Determine the outside diameter of column if inside diameter is 185 mm and compressive stress of 50 Mpa.
A. 0.66 in
71
71. A 2 inches diameter main shaft running at 600rpm is mounted by a 12 inches diameter pulley and is then connected to the shaft of driven machine mounted by a 40 inches diameter pulley by means of a belt. The belt efficiency is 90%. Find the diameter of the short shaft.
C. 2.25inches
72
72. An 18 teeth sprocket driving with 98 teeth sprocket at a center distance of 34 pitches. Find the chain length in pitches,
A. 131
73
73. A flange bolt coupling consists of eight steel 20mm diameter steel bolts spaced evenly around a bolt circle. 300mm in diameter. If the coupling is subjected to a torque of 15.1 KN-m, determine the maximum shearing stress in the bolts.
C. 5810 psi
74
74. Atriple thread worm gear having a diametral pitch of 5 in is use to deliver a gear. The speed ratio is 10. Find the pitch line velocity of gear if the worm rotates at 600 rpm.
D. 94.25 fpm
75
75. A double thread worm gear having a pitch of 1 in and has a linear speed of 200 fpm. The pitch diameter of worm is 4 in. Find the tangential speed of the worm.
A. 1,256.64 fpm
76
76. Kevin bought a flange coupling with bolt circle diameter of 250mm uses 10 bolts, 25mm diameter. The torque transmitted is 15 KN-m and compressive stress of bolts is 15Mpa. Determine the required flange thickness.
B. 32mm
77
77. A single worm gear has a pitch diameter of 2 in and a pitch of 1in with coefficient of friction of 0.21. The normal angle is 14.5 degrees with tangential force on gear of 1000 lbs. Find the separation force on gear and worm considering a left hand threads.
B. 271.23 lbs
78
78. A pair of bevel gear having a speed ratio of 2 has 4-pitch at 14.5° involute. The pitch diameter of pinion is. 7 in. Find the dedendum angle of the gear.
B. 2.11 deg
79
79. A class 3 pinion bevel gear is made of alloy steel hardened to 300 Brinell. The pinion runs at 850 rpm with 5in pitch diameter. Find the gear stress at factor of safety 3.
A. 35,023psi
80
80. A helical gear having 20 teeth and pitch diameter of 5 in. Find the normal diametral pitch if helix angle is 22 degrees.
B. 4.31 in
81
81. For a single Hooke's coupling, the shaft angle should not be greater than about
B. 15°
82
82. A helical gear tangential load of 200 lbs and axial load of 73 lbs. Find the helix angle.
D. 20 degrees
83
83. Atriple thread worm has pitch diameter of 3 inches. The wheel has 25 teeth and a pitch diameter of 5 inches. Material for both the worm and the wheel is of phosphor bronze. Complete the helix angle..
A. 78.69
84
84. A 70mm diameter shafting of SAE 1040 grade, cold rolled, having a yield point of 52 ksi and Xx%x4 inches key. Compute the minimum yield point in the key in order to transmit the torque of the shaft. The factor of safety is 3.
A. 3632.93 kg/cm²
85
85. Compute the working strength of 1 % in bolt which is screwed up tightly in packed joint when the allowance working stress is 90,000 kPa,
A. 11,261.66 lbs
86
86. A bearing 2.085 inches in diameter and 1.762 in long supports a journal running at 1200rpm. It operates satisfactorily with a diametral clearance of 0.0028 in and a total radial load of 1,400 lbs. At 160°F operating temperature of the oil film, the bearing modulus ZN/P was found to be 16.48. Determine the viscosity, centipoises
B. 5.23
87
87. The main bearings of an engine are 152mm diameter and 280mm long and supports a load of 4400kg midway between the bearings. Find the bearing pressure in Kpa.
C.507
88
88. The tension ratio for a belt in a pulley with a 200 angle and a frictional coefficient of 0.3 is:
A. 2.85
89
89. A pulley 610mm in diameter transmits 40KW at 500rpm. The arc of contact between the belt and pulleys is 144 degrees, the coefficient of friction between belt and pulley is 0.35 and the safe working stress of the belt is 2.1 and the safe working stress of the belt is 2.1 Mpa. What is the effective belt pull in Newton.
A. 2,505N
90
90. For a bolted connection, specification suggests that a high grade material of 13 mm bolt be tightened to an initial tension of 55,000N. What is the appropriate tightening torque?
D. 143N-m
91
91. An eye bolt is lifting 500 lbs weight. The Su=70ksi and Sy=58ksi. What is the stress area of the bolt?
C. 0.1388in
92
92. A press is used to punch 10 holes per minute of 30mm diameter hole from 25m thick plate. Determine the power needed to punch a hole if ultimate shear stress is 400 Mpa.
B. 1.96KW
93
93. The kinetic energy needed to punch a hole is 5kj. What is the maximum thickness of hole that can be punched if hole diameter is 25mm and ultimate shear stress of plate is 420 Mpa.
C. 17.41mm
94
94.A triple thread worm gear is use to drive a 25 teeth gear having a pitch of % in. Find the center distance.
B. 3.34in
95
95. A rail having a coefficient of linear expansion of 11.6 x 10^-6 m/m-°C increases its length when heated from 70 °F to 113 °F. Determine the strain.
D. 2.77x10^-4
96
96. A flywheel has a rim weight of 1000 lbs and mean radius of 2 ft. If rim width is 5 times the rim thickness and material density is 7200 kg/m³, determine the width of flywheel.
C. 286.75 mm
97
97. How many ½ inch diameter hole that can be punch in one motion of a 1/8 inch thick plate using a force of 50 tons. The ultimate shear stress is 52 ksi and factor of safety of 3.
B. 9
98
98. A flat key is to be designed for 75mm diameter shaft which will transmit 200 Hp at 350 rpm. If allowable shearing stress is 29000 psi and key width is 15mm, determine the length of key.
B. 36.02 mm
99
99. A 1.5" diameter short shaft is used to transmit 44.4hp. Determine the shaft speed.
B. 500 rpm
100
100. What modulus of elasticity in tension is required to obtain a unit deformation of 0.00105 m/m from a load producing a unit tensile stress of 44,000 psi?
D. 41,905x100psi.