INSTRUCTIONS: Solve the following problems. A. 5.97 deg, 46.19 kWC.75.9 deg, 17.

46 kw
B. 9.57 deg, 19.46 kWD.5.96 deg, 24.96 kW
1 An engine of a motor vehicle with a wheel Answer: B (9.57 deg, 19.46 kW)
dlameter of 700 mm develops 60 kW at 1800
rpm. Determine the axlal force on the clutch, In 9. Determine the power capacity of a cone with
kN. Outslde and Inslde dlameters of the clutch mean dlameter of 260 mm if the conical
are 250 mm and 220 mm, respectlvely, There elements Inclined at 8.5 degrees and axlal force
are 4 mating pairs of mating Surfaces with f = of 500 N. The rotatlonal force of dlrver Is 220
0.28. rpm and the friction is 0.25.
A 2.42 kN C. 4.42 kNN ta A. 3.52 kW C. 1.52 kW
B. 5.42 kN D. 6.42 kN B. 5.52 kW D. 2.53 kw
Answer: A (2.42 kN) Answer: D (2.53 kW)

2. The larger diameter and the face of the disk of a 10. A simple disc clutch has an outside diameter of
multiple disk clutch are 225 mm and 20 mm 220 mm and inside diameter of 110 mm. The
respectively. The load applied to the spring of friction is 0.30 and the applied load is 1300 N.
the clutch axially is 1500 N. Assuming that there Calculate the torque transmitted using uniform
are 8 palrs of friction 0.18 and turning 800 rpm. wear.
Find the power transmitted by the clutch using A. 33.37 N-m C. 37.33 N-m
uniform pressure method. B. 73.33 N-m D. 33.33 N-m
A. 14.67 kW C 13.67 kW Answer: A (33.37 N-m)
8. 15.67 kW D. 17.637 kW
Answer: C (13.67 kW) 11. The angle of contact of a band clutch is 260
degrees. The cross-section of the band is 1/16-
3. A block clutch has four wooden shoes each in x 2-in. The design stress for the band material
contacting with 80 degrees of the inside of a 13- is 8500 psi. If the drum is 15 inches in diameter
in drum. The coefficient of friction is 0.40 and and rotates at 360 psi, find the power capacity
N Une maximum contact pressure is not to exceed of the clutch if f=0.35.
40 psi. The clutch is to transmit 20 hp at 280 A. 22.36 hp C. 34.24 hp
rpm. Determine the required width of the shoes. B 36.22 hp D. 23.26 hp
A. 2.195 in C 1.295 in Answer: B (36.22 hp)
B. 1.195 in D. 2.549 in
Answer: C (1.295 in) 12. A band clutch has an angle of contact of 260
degrees on a 16-in diameter drum. The
4. An engine developing 50 HP at 1200 rpm is rotational speed of the drum is 260 rpm and the
fitted wlth a cone clutch bult Into the flywheel. clutch transmits 10 HP. The band is 1/16-in thick
The cone has a face angle of 12 degrees and and has a deslgn stress of 4800 psl. How wide
maximum dlameter of 15 in. The coefficlent of should the band be? Use f=0.35.
friction is 0.30. The normal pressure on the A. 3.21 in C. 1.26 In
clutch face is not to exceed 13 psi. Determine B 2.13 in D. 6.21 in
the face width required. Answer: C (1.26 in)
A. 2.9054 in 2.1905 in
B. 3.9054 D.1.9052 in 13. A cone clutch has cone eiements at an angle of
Answer: D (1.9052 in) 13 degrees. The clutch transmits 20 HP at speed
of 1000 rpm. The mean diameter of the conical
5. Using uniform wear, find the power capacity of a friction section is 15" and the coefficient of
single disc clutch with an outside diameter of friction is 0.20. Find the axial force needed to
1. 180 mm and inside diameter of 110 mm, engage the clutch.
rotating at 1100 rpm (f=0.30). The axlal A. 922.28 lbs C. 298.29 Ibs
operating force is 900 N. B. 982.28 lbs D. 229.98 tbs
A. 2.299 kW C. 3.399 kW Ánswer: D (229.98 lbs)
B. 4.499 kW D. 5.599 kW
'
Answer: A (2.299 kW) 14. A disc clutch has 6 pairs of contracting friction
surfaces. The frictional radius is 2.5-in and the
6. Determine the power capacity of unlform wear coefficient of frictlon is 0.28. An axial force is
cone clutch having a major diameter of 210 mm, 120 lbs acts on the clutch. The shaft speed is
length of contact of 120 mm, f = 0.28, speed of 380 rpm. What is the power transmitted by the
850 rpm and has an operating force of 600 N. clutch?
A. 3.6 kW C. 6.3 kWV A. 2 hp C. 3 hp
B. 4.6 kW D. 6.4 kw B. 1 hp D. 4 hp
Answer: C (6.3 kW) Answer: C (3 hp)
Find the cone angle of a dutch having a major 15. A clutch has an outside diameter of 9-in and
diameter of 280 mm and minor diameter of 220 inside diameter of 4-in. An axial force of 600 Ib
mm and length of contact of 260 mm. is used to hold the two parts together. If the
A. 2.66 deg C. 3.66 deg friction is 0.30, how much torque can the clutch
B. 6.62 deg D. 3.62 deg handle?
Answer: B (6.62 deg) A. 316.85 in-Ibs C. 613.85 in-Ibs
B. 816.36 In-lbs D. 231.85 in-lbs
8. Find the power capacity and the cone angle of a Answer: C (613.85 in-Ibs)
cone clutch under uniform pressure having 220
mm major diameter, 180 mm minor diameter, 16. How much torque can a cone clutch transmit if
length of contact of 120 mm, 880 rpm, f=0.65, the angle of the conical elements is 12 degrees?
and allowable pressure of 80 kPa. The mean diameter of conical sections is 180
 mm and an axial force of 500 N is applied. A. 2.8 kNN C. 3.8 kN
Consider a coefficient of friction of 0.40. B. 6.8 kN D. 8.8 kN
A. 86.6 N-m C. 68.6 N-m Answer: A ( 2.8kN)
B. 78.6 N-m D. 88.6 N-m
Answer: A (86.6 N-m) 24. A steel band has a maximum tensile stress of 60
MPa and thickness of 5 mm. If the tension in the
17. A cone clutch has an angle of 10 degrees and tight side ls kN, what width of band should be
coefficient of friction of 0.40. Compute the axial used?
force required if the capacity of the clutch is 12 A 67.62 mm C. 76.62 mm
kW and 520 rpm. The mean diameter of the B 62.67 mm D. 26.27 mm
active conical sections is 310 mm. Use uniform Answer: D (26.27 mm)
wear method.
716.2 N C. 271.6 N 25. On a brake drum the difference in tension
B. 617.2 N D. 172.6 N between the slack side and the tight side is 8
Answer: B (617.2 N) KN. If the ratlo in the band tension is 4,
determine the tension in the tight side.
18. Determine the force with which the brake shoe A. 12.67 kN C. 10.67 kN
of a diesel electric train must be pressed against B. 13.67 kN D. 14.67 KN
the wheel to absorb 220,000 ft-lb of energy in Answer: C (10.67 kN)
18 seconds if the mean velocity of wheel relative
to the brake shoe is 40 fps and the coefficient of 26. In a brake, the tension on tlght side is thrice the
friction is 0.30. slack side. If coefficlent of friction is 0.30,
A. 1810.5 Ibs C. 1018.5 Ibs determine the angle of contact of the band.
B. 8110.5 lbs D. 5810.5 Ibs A. 209.8 deg C. 109.8 deg
Answer: C (1018.5 Ibs) B. 309.8 deg D. 409.8 deg
Answer: A (209.8 deg)
19. A band brake is used to fasten to a 900 mm
drum with tight side 4 times the slack side of 27. A brake has a difference in a band tension of 5
force. The torque transmitted is 3 kN-m and a kN. The drum diameter is 1.5 meter and rotating
steel band with a maximum tensile stress of 70 at 280 rpm. Calculate the power needed to drive
MPa and 3 mm thick will be used. What should the drum.
be its width, in mm? A. 192.21 kW C. 912.12 kW
A. 24.3 mm C. 32.4 mm B. 219.91 kW D. 129.21 kW
B. 42.3 mm D. 23.4 mm Answer: B (219.91 kWN)
Answer: B (42.3 mm)
28. A machine is to punch 28 mm diameter hole
20. A band brake is installed on a drum rotating at from a 20 mm thick plate having an ultimate
260 rpm and a diameter of 880 mm. The angle shearing strength 420 MPa. A flywheel is to be
of contact is 1.5 n rad and one end of the brake designed with a mean diameter of 1.2
band is fastened to a fixed pin while the other coefficient of fluctuation of 0.12. The flywheel's
end to the brake arm 160 mm from the fixed hub and arm weighing may be taken to be four
pin. The coefficient of friction Is 0.30 and the times its thickness. Find the flywheel weight
straight brake arm is 1100 mm long and is required, in kg.
placed perpendicular to the diameter bisecting A. 263 kgs C. 362 kgs
the angle of contact. Find the minimum force, in B. 623 kgs D. 462 kgs
N applied at the end of the brake arm necessary Answer: C (362 kgs)
to stop the drum if 70 kW is being absorbed.
A. 273.1N C. 723.1 N 29. A flywheel releases 260 k of energy during
B. 172.3 N D. 271.3 N operation. It has a mean diameter of 1 m and
Answer: A (273.1 N) the speed changes from 280 rpm to 220 rpm
during punching. The weight of the arm and hub
21. A band brake has an angle of contact of 250 is 12% of the rim welght with filywheel material
degrees and is to sustain a torque of 12,000 in- of 0.020 kg/cm?, Calculate the width of the rim,
lbs. The band bears against a cast iron drum if if the thickness is 10 cm.
15-in diameter. The coemiclent of friction Is A 89.8 cm C. 98.8 cm
0.35. FInd the tenslon at the tight slde. B. 88.9 cm D. 28.9 cm
A 1019.2 lbs C. 1210.9 lbs Answer: A (89.8 cm)
B. 1021.9 lbs D. 2110.9 Ibs
Answer: B (1021.9 lbs) 30. A flywheel is designed to punch 18 holes per
22. The ratio of band tension in a band brake is 5.If minute. It is used to punch 2.5-in diameter hole
angle of contact Is 260 degrees, determine the from steel plate 2-in thick. If the ultimate
Coefficlent of friction. shearing stress of the plate Is 260 MPa, find the
A. 0.4537 C. 0.4735 power needed to punch the hole.
B. 0.3547 D. 0.5347 A. 1.256 kW C. 2.651 kw
Answer: B (0.3547) B. 6.125 kW D. 6.215 kW
Answer: A (1.256 kW)
23. A band brake has a straight brake arm of 1.8m
and is placed perpendicular to the diarneter 31. An 800 kg flywheel changes its speed from 200
bisecting the angle of contact of 270 degrees rpm to 170 rpm during punching. If the mean
which is 200 mm form the end of the slack side. dlameter of the flywheel is 650 mm, find the
If 220 N force is applied at the other end energy released by the flywheel.
downward of brake arm, determine the tension A. 5.14 kJ C. 41.5 k
at slack side, B. . 6.14 kJ D. 7.14 k
 HOME 03(MDSP PROBLEMSs

A. C. 197.6 kg
681.7 kg
B. 186.7 kg D. 987.6 kg
Answer: A (5.14 k)
Answer: B (186.7 kg)
a 3.5-in
32. Fin the pressure needed to punch diameter of flywheel,
480 kg
1.5-in thick steel plate. mean
diameter hole from a 41. A 1.30 m from 210 rpm to 230
C. 420 tons its speed
A. 240 tons welght changes Calculate the force
B. 402 tons D. 204 tons rpm during
shearing process.
shear a 28 mm thick
plate.
Answer: C (420 tons) needed to
C. S69.98 kN
A. 896.89 kN
absorb 698.98 kN
diameter flywheel has to B. 982.68 kN D.
33. A 5.50 ft mean
and maintain a coefficient Answer: D (698.98 kN)
3800 ft-b of energy
the mean speed is 90
of fluctuation of .10. If 25 mm thick
with
of the flywheel. mm wide and
find the weight
ft/sec, 42. A plate 180 be sheared. During
MPa is to
4. 151 bs
C. 252 Ibs strength of 420 mm mean
diameter
D. 115 Ibs process, a 900
B. 511 lbs the shearing
from 220 rpm to 190
Answer: A (151 lbs) flywheel changes speed of the flywheel to be
Determine the welght
rpm.
1200 kg has a radius of
34. A flywheel weighing used.
The normal operatlon speed 7291.8 kg C. 1729.8 kg
gyratlon of 1.80 m. A.
coefficlent of fluctuatlon of 0.08. 1987.2 kg D. 7819.2 kg
is 180 rpm and B.
kinetic energy released by the flywheel. Answer: C (1729.8 kg)
Find the
A. 011.5 k C. 210.5 k
D. 511.0 k process of 400 kg flywheel
B. 110.5 43. During a pinching varies
Answer: B (110.5 ki) with 1.20 m mean
diameter, the speed
Find the kinetic
170 rpm.
from 200 rpm to
has a welght of 830
35. A 50-1n diameter flywheel If
energy required.
the speed is 190 rpm. A 9.9 kJ C. 8.8 kJ
lbs. During operation, calculate
of fluctuatlon is 0.88, B. 2.2 k D. 5.5 k
the coefficient
the energyreleased by the flywheel. Answer: C (8.8 kJ)
A. 9836 Ib-ft C. 8693 Ib-ft
is 8
B. 6983 lb-ft D. 3986 Ib-ft needed to punch a hole
44. The kinetic energy that
thickness of plate
Answer: D (3986 Ib-ft) k. What is the maximum 30 mm
can be punched If
the hole diameter is
has a width is 450 MPa.
36. A 920 mm mean
diameter flywheel ultimate stress of the plate
thickness and 7200 kg/m* nd the C. 18.43 mmn
of 380 mm, 80 mm and A. 42.19 mm
Neglecting the weight of the arm B. 92.14 mm D. 19.42 mm
density. released if the
for the energy Answer: D (19.42 mm)
the hub, compute
to 240 rpm.
speed changes from 290 rpm
A. 19.45 kJ C. 45.19
45. A press is used to punch
10 holes per minute of
D. 84.19 a 25 mm thick
B. 91.54 k 28 mm diameter holes from
Answer: A (19.45 kJ) required to punch a hole,
plate. Find the power MPa.
if the ultimate shear stress is 420
to shear a plate of 60 mm C. 3.91 kW
37. The power required A. 2.91 kW
thickness for 12 sec Is 8 kw. If the ultimate B. 1.92 kW D. 3.92 kW
of the plate material is 450 MPa, how
strength Answer: B (1.92 kW)
wide should the plate be?
A. 511.3 mm C. 811.4
mm and 1.8 inches long
A bearing 2.0 inches in diameter
B. 711.3 mm D. 118.5 mm
at 1500 rpm. It operates
supports a journal running
Answer: D(118.5 mm) with a diametrical clearance of 0.00287
inch
satisfactorily
and a total radial load of 1420 lbs. At
150 deg F
of 480 kg and mean
38. A flywheel has a rim welght operating temperature of the oll flm, the bearlng
If the rim wldth is 6 times the
radlus of 480 mm. modulus ZN/P was found to be 16.50.
rim thickness and materlal denstty Is 7300 46. Determine the bearing stress
kg/m, calculate for the width of the flywheel. C. 493.3 psi
A. 394.4 psl
A. 361.7 mm C. 176.3 mm B. 493.3 psi D. 693.3 psi
B. 163.7 mm D. 761.3 mm
Answer: A (394.4 psl)
Answer: A (361.7 mm)
47. Determine the viscoslty.
of 600 kg and the
39. A flywheel has a total welght A. 3.43 4 4.33
arm and the hub is 10%
of the
weight of the B. 3.44 D. 3.34
it has a mean diameter of 1.2 m
otal weight. If Answer: C (4.33)
Determine the thickness
and width of 310 mm.
If the density of the materlal is
of the flywheel 48. A journal mm in diameter and 25 mm
bearing 55
7100 kg/m. supportsradial
a load of 1400 kg. If the
A. 56 mm C. 65 mm long
coefficlent of bearing frlctlon Is 0.12 and the
B. 46 mm D. 64 mm
journal rotates at 1000 rpm, find the horsepower
Answer: C (65 mm) loss in the bearing.
a hole Is 3.20 k A. 0.2635 hp C. 0.3625 hp
40. The energy requlred to punch B. 0.6932 hp D. 0.6362 hp
from a flywheel mean diameter of 850 mm that
2.8 to 3.5 rps during Answer: D (0.6362 hp)
slows down to rps
and hub account
punching. If the weight of arm 49. A 78 mm bearing using oil with an absolute
the rim welght, determine the rim
to 9% of
viscosity of 0.70 poise running at 520 rpm gives
welght.
 raREHOME 03(MDSP PROBLEMS1

satisfactory operation with a bearing pressure of B. 945.2 kPa D. 784.2 kPa

12 kg/cm2. The bearing clearance is 0.130 mm. Answer: C (947.2 kPa)
Find the unit pressure at which the bearing
should operate if the speed is changed at 600 58. The weight of each wheel of a motor-driven
rpm, in kg/cm2. travelling crane moving at 600 fpm is s800 Ibs.
A. 13.85 kg/cm2 C. 15.85 kg/crn2 If the coefflclent of rolling frictlon Is 0.05, find
B. 18.35 kg/cm2 D. 12.85 kg/cm2 the horsepower requlred to overcome rolllng
Answer: A (13.85 kg/cm) frlctlon.
A. 21 hp C. 41 hp
50. by 3.5-in dlameter and 4.5 8. 31 hp D. 51 hp
A shaft is supported
in long bearing that uses oilwith a viscosity of Answer: A (21 hp)
2.8 x 10reyns. The bearing has a diametral
clearance of 0.009-In. At what speed should the 59. Find the desired life of a ball bearing to support
a radlal load of 4500 if with moderate shock and
shaft rotate so that the friction power Is limited
a trust load of 2000 Ib for 20 hrs per day for 10
only to 0.95 HP.
A. 8426.6 rpm C. 6423.6 rpm yeairs.
B. 3482.6 rpm D. 5698.6 rpm A. 23000 hrs C. 63000 hrs
Answer: B (3482.6 rpm) B. 73000 hrs D. 53000 hrs
Answer: B (73000 hrs)
51. A shaft rotating at 1750 is supported by bearing
with a length of 100 mm and diameter of 65 60. Compute the force necessary to move a weight
mm. If the load is light and SAE OIL No. 20 of 6000 Ibs supported on for steel wheels of 2.5
(u=2.5 x 10reyns)is used and diametral ft diameter, assuming the coefficient of friction
clearance is 0.135 mm, compute the power loss to be 0.007.
due to friction. A. 52 Ibs C. 62 Ibs
A. 851 W C 185 W B. 72 lbs D. 42 Ibs
E. 158 W D. 581 W Answer: D (42 Ibs)
Answer: C (185 W)
A pair of meshing gear has a module of 3. The pinion has
52. A bearing, whose shaft rotates at 550 rpm, has 20 teeth and the gear has 30 teeth. Find the
a friction loss of 20 kW. The bearing load is 35 61. Pitch diameter of each gear
k and friction of 0.15. Find the bearing 62. Center distance between gear
diameter. A. 60 mm, 90 mm, 75 mm
A. 231.3 mm C. 132.3 mm B. 30 mm, 40 mm, 95 mm
B. 531.3 mm D. 451.3 mm C. 30 mm, 80 mm, 65 mm
Answer: C (132.3 mm) D. 70 mm, 20 mm, 35 mm
Answer: A (60 mm, 90 mm, 75 mm)
53. A bearing has a per unit load of 600 kPa. The
load on the bearing is 25 kN and it has a 63. A 220 mm diameter of 14. 5 degrees involute
diametral ratio of 0.0015. If the diametral gear is used to transmit 50 kW at 580 rpm. Find
clearance is 0.120 mm, find the length of the the total force transmitted on the gear.
A. 8.5 kN C. 7.5 kN
journal.
A. 520.8 mm C. 820.8 mm B. 6.5 k D. 5.5 kN
B. 987.8 mm D. 598.8 mm Answer: C (7.5 kN)
Answer: A (520.8 mm)
64. A 12-in diameter gear is used to transmit 30 kW
54. A bearing journal rotates at 480 rpm is used to at 850 rpm. Find the tangential force acting on
support a load of 60 kN. It has a diameter of 25 eacn gear
cm and length of 45 cm. Find the friction loss in A. 1.1 kN C. 3.3 kN
KW per bearing. Use f=0.13. B. 2.2 kN D. 4.4 kN
A. 45.5 kW C. 42.5 kWw Ariswer: B (2.2 kN)
B. 24.5 kW D. 65.4 kW
Answer: B (24.5 kW) 65. An internally meshing gear has a center distance
of 25-In. If the larger gear has a diameter of 55-
55. A bearing 160 mm diameter and 320 mm long in, find the diameter of the internal gear.
supports a oad of 6000 kg. If the coefficlent of 5 in C. 6 in
friction Is 0.19, find the torque requlred to rotate 8 in D. 7 in
the shaft. Answer: A (S in)
A. 498.6 N-m C. 598.6 N-m
B. 859.6 N-m D. 894.6 N-m 66. A gear has a pitch diameter of 10-in and
Answer: D (894.6 N-m) diametral pitch of 6, calculate the outside
diameter.
56. The main bearing of one cylinder steam are 150 A. 11-1/3 in C. 10-1/3 in
mm diameter by 290 mm long and support a B. 12-1/3 in D. 12-1/3 in
load of 4500 kg. Find the bearing stress. Answer: C (10-1/3 In)
A. 874.5 KPa C. 507.4 kPa
B. 594.5 kPa D. 598.5 kPa 67. A 14. 5 degful-depth gear has a tooth thickness
Answer: C (507.4 kPa) of 0.30-in, find the addendum distance.
A. 0.19099 In C. 0.29012 in
57. The main bearing of one cylinder steam are 150 B. 0.96429 in D. 0.35941 in
mm diameter by 290 mm long arnd supports a Answer: A (0.19099 in)
load of 4200 kg. Find the bearing stress.
A. 749.2 kPa C. 947.2 kPa
 prEU SP PROBLEMS|

the number
68. A 20 deg full-depth gear has a tooth thickness largest of which has 40 teeth. Find
of 0.20-in, find the addendum distance. of teeth of smaller gear.
A. 0.1373 in A. 10 teeth C. 20 teeth
C. 0.1469 in
B. 30 teeth D. 40 teeth
B. 0.1795 in D. 0.1273 in
Answer: D (0.1273 in) Answer: A (10 teeth)
diarmeter of a gear with 30
69. What is the equtlvalent dlametral pltch of a gear 79. Determine the pitch
that has a module of 3? teeth, 5 dlametralpitch.
A. 16 in C. 12 in
A. 6.5 in C. 4.5 in
B. 15 in D. 14 in
B. 8.5 in D. 3.5 in
Answer: B (8.5 in) Answer: B (15 in)
between centers of a pair of
70. A standard 20 deg full-depth spur gear has 26 80. Find the distance
has 14 teeth and the other
teeth and circular pitch of 0.785-in. Compute the gears, one of which
38 teeth. The diarmetral pitch is 8.
working depth. A. 2.35 In C.6.23 in
A. 0.439 in C.0.539 In B. 3.35 in D. 3.25 in
B. 0.985 In D. 0.549 in
Answer: D (3.25 In)
Answer: C (0.539 In)
a center
71. How many revolutlons per minute Is a spur gear 81. Flnd the circular pitch of gear having with
distance of 12 in and has 24 teeth pinion
turning if it has a module of 3 mm, 42 teeth,
56 teeth gear.
and pitch line velocity of 2600 mm/sec? C. 0.8956 in
A. 0.9425 in
A. 394 rpm C. 943 rpm
B. 0.3695 in D. 0.5698 in
B. 493 rpm D. 349 rpm Answer: A (0.9425 in)
Answer: A (394 rpm)
A machlnst made two 9 dlametral pltch spur
gears to be
72. How many revolutions per minute Is a spur gear inches with a speed
mounted at a center distance of 18
if it has 30 teeth, a circular pitch of
turning, ration of 8 to 10. Compute the following:
0.785-in and a pitch Iine velocity of 15 ft/sec?
82. Pitch diameter of each gear
A. 854.6 rpm C. 345.6 rpm 83. Number of teeth of each gear
B. 895.6 rpm D. 458.6 rpm 84. Outside diameter of each gear
Answer: D (458.6 rpm)
85. Circular pitch
Answers: (16 in, 20 in, 144 teeth, 180 teeth,
73. What is the pitch diameter of a 42 teeth spur
16.22 in, 20.22 in, 0.3491 in)
of 1.60?
gear having a circular pitch
A. 12.93 in C. 22.93 in
D. 23.19 in 86. Shaft A with 12-in pulley diameter running at
B. 21.39 in 280 rpm is connected to shaft B by means of
Answer: B (21.39 in) 30-in diameter pulley. Another pulley on shaft B,
15-in diameter is connected to 11-in diameter
involute teeth has
74. A spur gear 20 deg full-depth shaft C. Determine the speed of shaft
an outside diameter of 190
mm and module of pulley on

5.2778. Find the number of teeth. C.

A. 251.7 rpm C. 215.7 rpm
A. 43 teeth C. 34 teeth
B. 152.7 rpm D. 521.7 rpm
B. 53 teeth D. 63 teeth
Answer: B (152.7 rpm)
Answer: C (34 teeth)

has a diametral pitch of

87. A puiley has tangential velocity of 80 fpm. 1f
75. A pair of meshing gears pulley diameter is 12-in, determine the speed of
10.7140, a center distance of 2.8-in, and a
of the pulley
velocity ratio of 2. Find the number of teeth A. 52.5 rpm C. 25.5 rpm
the smaller gear.
C. 20 teeth B. 62.6 rpm D. 26.6 rpm
A. 40 teeth
B. 50 teeth D. 60 teeth Answer: C (25.5 rpm)
Answer: C (20 teeth)
88. Four cylinders roling In opposite directlons has s
involute gear has an speed ratio of A:B:C:D = 6:4:2:5. If the center
76. A 14.5 degrees full-depth
outslde dilameter of 5-1/3 In and dlametral pitch dlstance between cylinder A and C ls 74-in,
of 6. Find the number of teeth. determine the diameter of cylinder D.
C. 20 teeth A. 25.7 In C. 52.7 in
A. 30 teeth
B. 40 teeth D. 40 teetth B. 27.5 in D. 72.5 in
Answer: A (30 teeth) Answer: A (25.7 in)

77. Two parallel shafts have a center distance of 16- 89. Two cylinders roling in the same direction has a
in. One of the shafts carriesa 42-tooth, 23 speed ratio of 2.8 and center distance of 60 cm.
diametral pitch gear which drives a gear on the Determine the diameter of the larger cylinder.
other shaft at a speed of 160 rpm. How fast Is A. 37.5 in C. 73.5 In
the 42-tooth gear tuming? B. 53.7 in D. 37.5 in
A. 38.8 rpm C. 84.8 rpm Answer: C (73.5 in)
B. 73.8 rpm D. 83.8 rpm
Answer: D (83.8 rpm) 90. Two cylinders rolling in the opposite direction
has a speed ratlo of 3.5. If the dlameter of drive
78. Two parallel shafts have an angular velocity is 12-in, find the center distance between
ratio of 4 to 1 are connected by gears, the cylinders.
A. 72 in C. 37 in
 TAKEHOMT 03 (MDSP PROBLEMS

B. 27 in D. 42 in A. 93.6%% . 96.3%
Answer: B (27 in) D. 69.3%
B. 63.9%
Answer: B (63.9%)
91. An 820 mm diameter circular saw
blade is driven diametral
by 1500 rpm motor with gear speed ratio of 1.5. 102.A triple thread worm gear having
a

Find the peripheral speed of the blade. dellver a gear. The speed
pltch of 5-In Is used to lIne velocity of gear f
A. 120.8 fps C. 240.8 fps ratlo Is 8. Find the pltch
B. 140.8 fps D. 246.8 fps the worm rotates at 650 rpm.
Answer: B (140.8 fps) A. 2.8 fps C. 1.7 fpsS
B. 2.9 fps D. 1.3 fps
92. A helical gear tangential load of 220 Ibs and Answer: C (1.7 fps)
axial foad of 75 Ibs. Compute the hellx angle.
has a helx angle of 83
A. 60 deg C. 50 degg 103.A double thread worm
diameter of 5.75-in. The worm
B. 30 deg D. 70 deg deg and pltch the linear speed of the
rotates at 820 rpm. Find
Answer: D (70 deg)
Wori.
A. 151.6 fpm C. 511.6 fpm
93. A helical gear having 22 teeth and pitch B. 211.6 fpm D. 116.6 fpm
diameter of 6-in. Find the normal diametral pltch
Answer: A (151.6 fpm)
f the helix angle is 20 degrees.
A. 3.9 C. 9.3 is used to drive a 24
104.A triple thread worm gear
B. 2.9 D. 9 pitch of 0.75-in. Compute
teeth gear having a
Answer: A (3.9) the center distance
A. 2.33 in C. 3.22 in
94. An 80 HP motor, running at 460 rpm is geared D. 4.33 in
B. 3.22 in
to a pump by means of helcal gear having a Answer: B (3.22 in)
pinion diameter of 9-in. Find the tangential force
of the gear. a pitch of 1-in is
105.A double thread worm having
A. 2435.8 lbs C. 4598.8 Ibs Find the pitch
used to drive a 42 teeth gear.
B. 2984.8 lbs D. 2698.8 Ibs
diameter of the gear.
Answer: A (2435.8 lbs) A. 14.3 in C. 41.3 in
B. 13.4 in D. 13.4 in
95. A helical gear having a helix angle of 22 degrees
find the
Answer: B (13.4 in)
and presSure angle of 20 degrees,
rormal to the teeth.
pressure angle 106.A triple-thread worm, rotating at 1,200 rom,
A 16.8 deg C. 18.6 deg drives 32-teeth gear. Find the speed of the gear.
B. 29.8 deg D. 32.6 deg A. 211.5 rpm C. 113.6 rpm
Answer: C (18.6 deg) B. 411.3 rpm D. 112.5 rpm
diameter Answer: D (112.5 rpm)
96. A 30-tooth helical gear having a pitch
helix angle of 23 degrees. Find the
of 8 has a
107.A triple-thread worm gear has pitch of 0.75-in
Circular pitch in a plane normal to the teeth. and pitch diameter of 3.75-in. Find the helix
A. 0.1225 C. 0.1258
B. 0.7712 D. 0.2369 angle.
A. 97.91 deg C. 79.19 deg
Answer: B (0.7712) B. 89.97 deg D. 98.97 deg
diameter of Answer: C (79.19 deg)
97. A 20-tooth helical gear has a pitch
10-in. Find the diametral pitch of the gear.
108.A triple-thread worm gear has a helix angle of
3 C.4 82 degrees. It has a pitch of %-in. Find the
6 D. 2
pitch diameter of the worm.
Answer: D (2) C. 6.059 in
A. 5.096 in
A worm has four threads of 14.5 deg norrnal pressure B. 4.096 in D. 8.029 in
Answer: A (5.096 in)
angleand pitch diameter of 5.25-In. The gear has 56
teeth of 1.75-in pitch.
if the frlction is 109.A double-thread worm gear has a lead angle of
98. Find the efficlency of the worm
6.0 deg and pitch radus of 2.25-in. Find the
0.030.
pitch of the worm.
99. Find the center distance of the shafts C. 1/2 in
A. 90.2%, 18.2 in C. 80.2%, 17.2 in A 4 in
B. 4 in D. 1/8 in
B. 70.2%, 19.2 in D. 60.2%, 12.7 in
Answer: A (90.2%, 18.2 in) Answer: A (3/4 in)

100.A triple thread worm gear has normal pressure 110.A work rotating at 1200 rpm drives a worm
gear. The veloclty ratio is 16 to 1. A 12 HP
angle of 14.5 deg and coefficlent of friction of motor is Used to supply the worm with worm
0.20. If the worm efficlency is 78%, find the
pltch gear dlameter of 3.5-In. Find the tangential
lead angle.
87% force on the worm.
A 78% D. 58% A. 540.18 lbs C. 450.18 Ibs
B. 28%
Answer: A (78%) B. 240.18 lbs D. 590.18 Ibs
Answer: C (450.18 Ibs)
thread worm gear has a pitch of 4-in
101.A triple 111.A pair of bevel gear having a speed ratio of 2
and pitch diameter of 3-in. The nomal pressure
friction has a 4-pitch at 14.5 deg involute. The
angle is 14.5 degrees and coefficient of pitch
is Q,12. Find the worm efficlency,
 TAMEMOME 03 MDSP
PROBLEMS
diameter of plnlon Is 8-In. Find
angle of the gear. the dedendum
A. 5.2 deg rate ls 0.5 In per
C. 3.2 degg min, how long wlll It take to do
B. 2.5 deg the job?
D. 6.2 deg A. 663 min
Answer: B (2.5 C. 336 min
deg) B. 366 min D. 663 min
112.A palr of bevel Answer: C (336 min)
has a 5-pitch atgear having a speed ratio of 4
14.5 deg Involute. 121.How long wlll It take to mill a 0.5 by 3.5-in long
diameter of the The pitch
addendum angle pinion is 7-in. Find the keyway In a 4.5-in dlameter shafting with a 26-
of the pinion (at right angle tooth cutter turning at 100 rpm and 0.006-in
between shafts). feed per tooth?
A. 1.11 deg A. 14.3 sec C. 13.5 sec
C. 2.22 deg
B. 3.33 deg D. 4.44 deg B. 31.6 sec D. 56.3 sec
Answer: A (1.11 deg) Answer: C (13.5 sec)

113.The cone angle of pinion and the gear are 122.Calculate the manual cutting time in minutes of
deg and 64 24
deg, respectively, find the speed
a steel plate 4 ft x 8 ft by V2-in thick with a hand
ratio. Cutting speed of 4 to 5 mm/sec, cutting
A. 1.1 crosswise.
C. 2.2 A. 5.4 min
B. 3.3 C. 3.5 min
D.4.4 B. 6.5 min D. 4.5 min
Arswer: C (2.2)
Answer: D (4.5 min)
114.The cone angle o pinion of a pair of bevel gear 123. In an Oxygen-acetylene manual welding, to
is 32 deg while for the gear is 64 deg. If the weld a 6 ong seam in a %-in thick steel plate at
pinion turns 280 rpm, find the speed of the a consumption rate of 12 ft/ft for oxygen and
gear. 10 f for acetylene. Find the total gas
A. 741.96 rpm C. 946.26 rprn consumpton, in ft.
B. 564.96 rpm D. 174.96 rpm A. 231 ft C. 132 ft3
Answer: D (174.96 rpm) B. 132 f D. 213 ft
Answer: B (132 ft)
15.A spiral bevel pinlon wlth a left hand splral
transmlts 5 HP at 1300 rpm to a mating gear. 124.Compute the drlil penetratlon In Inch per minute
The mean dlameter of the pinBon Is 4-In. Flnd when a drill turns at 1200 rpm and the feed of
the tangental ferce at the mean radius of the 0.005-in per revolution.
gear. A. 5 inches per minutec.6 inches per minute
A. 121.2 Ibs
C. 211.2 Ibs B. 4 inches per minuteD.3 inches per minute
B. 311.2 Ibs
D. 155.2 Ibs Answer: C (6 inches per minute)
Answer: A (121.2 bs)
125.Find the time, in seconds, to saw a rectangular
116.A spiral bevel gear pinion with a left hand spiral bar 8-in wide and 1.8-in thick if the length of cut
rotates clockwise transrnits power to a matin9 is 8-in, the power hacksaw does 130 strokes per
gear with speed ratio of 3.0 to 1. Determine the minute and the feed per stroke is 0.155 mm.
pitch angle of the pinion. A. 605 sec C. 506 sec
A. 18.4 deg C. 19.2 deg B. 906 sec D. 609 sec
B. 17.4 deg D. 16.2 deg Answer: A (605 sec)
Answer: A (18.4 deg)
126.Compute the cutting speed, fpm of a work piece
117.A pair of straight tooth bevel gear connects a with 6-in diameter and running at 120 rpm.
pair of shafts at 90 deg. The velocity ratio is 2 to A. 188.5 ft/min C. 881.5 ft/mirt
1. What is the cone pitch angle of smaller gear? B. 588.5 ft/min D. 885.9 ft/min
A. 56.26 deg C. 26.56 deg Answer: A (188.5 ft/sec)
B. 46.46 deg D. 64.46 deg
Answer: C (26.56 deg)

118.A straight tooth bevel gear has a face width of ..END..

5-In and a pitch dlameter of 15-in with cone
pitch angle of 40 deg. If the torque on the gear
Is 8200 in-lb, what is the tangential force on the
gear?
A. 1931.5 lbs C. 5149.3 Ibs
B. 1391.5 Ibs D. 5946.3 Ibs
Answer: B (1391.5 Ibs)

119.A 20 deg full depth straight tooth gear has a

face width of 3.75-In and a pitch dlameter of 13-
in with cone pltch angle of 38 deg. Find the
mean diameter.
A. 10.7 in C. 20.1 in
B. 17.2 in D. 25.3 in
Answer: A (10.7 in)

120.A 7ft x 15 steel plate is to be divided into three

parts equally by cutting crosswise. If the cutting