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VIP > MD - BELTS, SPROCKETS, BOLTS AND SCREW > Flashcards

MD - BELTS, SPROCKETS, BOLTS AND SCREW Flashcards

1
Q

Find the horsepower required to drive a power screw lifting a load of
4000 Ibs. A 2 and 1/2 inches double square thread with two threads/in. is to be used. The frictional radius of the collar is 2 inches and the coefficients of friction are 0.1 for the threads and 0.15 for the collar.
The velocity of the nut is 10 ft/min.
A. 5.382 HP
C. 3.683 HP
B. 4.395 HP
D. 6.472 HP

A

B. 4.395 HP

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2
Q

A single square thread power screw is to raise a load of 70 KN. The screw has a major diameter of 36 mm and a pitch of 6 mm. The coefficient of thread friction and collar friction are 0.13 and 0.10 respectively. If the collar mean diameter is 90 mm and the screw turns at 60 rpm, find the combined efficiency of screw and collar,
A. 13.438%
C. 14.526%
B.15.530%
D. 12.526%

A

D. 12.526%

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3
Q

Determine the diameter of the stud bolt that are required to fasten down the cylinder head of a 203 mm x 304 mm gas engine. There are ten bolts on the block. The explosion pressure is 31 kg/sq cm and studs are made of ordinary bolts material SAE 1020. How deep should the bolt be drilled?
* 38.1 mm
* 40.2 mm
* 37.3 mm
* 35.5 mm

A
  • 38.1 mm
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4
Q

A single-threaded trapezoidal metric thread has a pitch of 4 mm and a mean diameter of 18 mm. It is used as a translation screw in conjunction with a collar having an outside diameter of 37 mm and an inside diameter of 27 mm. Find the required torque in N-m to raise a load of 400 kg if the coefficient of friction is 0.3 for both thread and collar.
A.34.6 N-m
B.32.6 N-m
C.39.1 N-m
D.38.5 N-m

A

B.32.6 N-m

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5
Q

A safety valve spring having 9 and 1/2 coils has the ends squared and ground. The outside diameter of the coil is 115 mm and the wire is 13 mm. It has a free length of 203 mm. Determine the length of the wire to which this spring must be initially compressed to hold a boller pressure of 1.38 Ma on the valve seat of 32 mm diameter. Modulus ofrigidity is taken as G = 80 GN/m?.
A. 172 mm
C. 192 mm
B. 179 mm
D. 158 mm

A

A. 172 mm

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6
Q

An ammonia compressor is driven by a 20 kW motor. The compressor and the motor RPM are 360 and 1750, respectively. The small sheave has a pitch diameter of 152.4 mm. If the belt to be used is standard C-120 (L=122.9 in.), determine the center distance between sheaves A.709 mm
C. 806 mm
B. 865 mm
D. 686 mm

A

C. 806 mm

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7
Q

An air compressor is driven by a 7.5 HP electric motor with a speed of1750 rpm with standard A-60 V- belts of length 61.3 in. The pitch diameter of the small sheave is 110 mm and the larger sheave is 200 mm. Service factor is 1.2. Determine the arc of contact.

173.92 degrees
183.56 degrees
169.87 degrees
212.65 degrees

A

169.87 degrees

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8
Q

A pulley 610 mm in diameter transmits 40 kW at 500 RPM. The arc of contact between the belt and pulley is0.35 and the safe working stress in Newton
of the belt is 2.1 MPa. Find the tangential force at the rim of the pulley
2,406 N
B. 4,321 N
* 2,505 N
* 3.321 N

A

2,505 N

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9
Q

A pulley 610 mm in diameter transmits 40 kW at 500 RPM. The arc of contact between the belt and pulley 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.
2,505 N
B. 3,931 N
* 4,528 N
* 2,823 N

A

2505 N

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10
Q

A certain farm equipment which requires 2200 Newton mater torque at
500 RPM has a diesel engine to operate at 1500 RPM as its prime mover. A No. 60 roller chain with a total length of 60 pitches and a small sprocket with 23 teeth are to be used with an operating temperature to remain constant at 45 degree C. Determine the no. of teeth of the larger sprocket.
A.70
B.79
C. 68
D. 69

A

D. 69

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11
Q

A 4 inches diameter shaft is driven at 3600 pm by a 400 Hip motor. The shaft drives a 48 inches diameter chain sprocket having an output efficiency of 85%. The output force of the driving sprocket and the output of the driven sprocket are:
* 200 lb and 250 hp
* 261.8 lb and 300 hp
* 291.66 lb and 340 hp
* none of the above

A

291.66 lb and 340 hp

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12
Q

A cylinder head of a steam engine is held on by 16 bolts. The effective diameter of the cylinder is 40 cm and the steam pressure is 9 kg/cm?.
Assuming that the bolts are not initially stressed, find the diameter of each of the bolts if the tensile stress is not to exceed 250 kg/cm?.
A. 18.97 mm
C. 97.18 mm
B. 81.97 mm
D. 81.79 mm

A

A. 18.97 mm

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13
Q

An eyebolt is lifting a block weighing 580 lbs. The eyebolt is of SAE C1040 material with Su=68 ki and Sy=65 ki, what is the stress area (in inches square of the bolt if it is under the unified coarse series thread?
A. 0.1271 in?
C. 0.1371 in?
B. 0.1471 in?
D. 0.1571 in?

A

B. 0.1471 in?

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14
Q

Compute the diameter of a set screw required to transmit 8 HP at a shaft speed of 850 rpm. The shaft diameter is 2-in.
A. 0.4331 in
C. 0.5113 in
B. 0.5331 in
D. 0.4332 in

A
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15
Q

What is the friction horsepower acting on a collar loaded with 600 kg weight? The collar has an outside radius of 110 mm and 80 mm inside is 160 rpm.radius. The coefficient of friction of the collar is 0.2. Assume the speec
* 3.5 hp
* 4.5 hp
* 1.5 hp
* 2.5 hp

A
  • 3.5 hp
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16
Q

What is the working stress of a 40 mm diameter bolt which is screwec up tightly in a packed joint when the working strength is 12 tons?
* 32358 psi
* 35328 psi
* 32258 psi
* 52328 psi

A
  • 32358 psi
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17
Q

A triple thread screw has a lead of 25 mm. Find the number of thread per inch.
A.B.0.348 thread per inch
C.3.048 thread per inch
B.0.483 thread per inch
D. 3.480 thread per inch

A

C.3.048 thread per inch

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18
Q

A square thread screw has an efficiency of 70% when friction of thread is 0.10 and collar friction is negligible. Find the lead angle, in deg.
A. 14.3 deg
C. 15.3 deg
B. 16.3 deg
D. 12.3 deg

A

A. 14.3 deg

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19
Q

A square thread power screw has a pitch diameter of 1.8 and lead of 1-in. Neglecting collar friction, compute the coefficient of friction for the threads if the screw efficiency is 65%.
A. 0.90803
C. 0.80903
B.0.09083
D. 0.30980

A

B.0.09083

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20
Q

A cylinder head of a steam engine is held on by 16 bolts. The effective diameter of the cylinder is 40 cm and the steam pressure is 9 ka/cm.
Assuming that the bolts are not initially stressed, find the diameter of each of the bolts if the tensile stress is not to exceed 250 kg/cm?.
A. 19.87 mm
C. 17.98 mm
B. 18.97 mm
D. 17.87 mm

A

B. 18.97 mm

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21
Q

An eyebolt is lifting a block weighing 580 lbs. The eyebolt is of SAE (1040 material with Su=68 ki and Sy=65 ksl, what is the stress area (ir inches square) of the bolt if it is under the unified coarse series thread?
* 0.1271 in?
C. 0.1371 in?
* 0.1471 in?
D. 0.1571 in?

A
  • 0.1471 in?
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22
Q

Compute the diameter of a set screw required to transmit 8 HP at shaft speed of 850 pm. The shaft diameter is 2-In.
A. 0.3315 in
C. 0.1335 in
B. 0.1553 in
D. 0.5331 in

A

D. 0.5331 in

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23
Q

What is the friction horsepower acting on a collar loaded with 600 kg weight? The collar has an outside radius of 110 mm and 80 mm inside radius. The coefficient of friction of the collar is 0.2. Assume the speec is 160 rpm.
A. 5.2 hp
B. 2.3 hp
2.4 hp
2.5 hp

A

0.198 HP

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24
Q

What is the working stress of a 40 mm diameter bolt which is screwed up tightly in a packed joint when the working strength is 12 tons?
A. 22538 psi
C. 32258 psi
B.22853 psi
D. 58223 ps

A

32258 psi

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25
Q

A triple thread screw has a lead of 25 mm. Find the number of thread per inch.
* 3.048 thread per inch
* 4.038 thread per inch
* 5.048 thread per inch
* 6.0384 thread per inch

A

3.048 thread per inch

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26
Q

A square thread screw has an efficiency of 70% when friction of thread is 0.10 and collar friction is negligible. Find the lead angle, in deg.
A. 15.3 deg
C. 13.4 deg
B. 14.3 deg
D. 12.3 deg

A

B. 14.3 deg

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27
Q

A square thread power screw has pitch diameter of 1.8 and lead of 1-in.Neglecting collar friction, compute the coefficient of friction for threads if the screw efficiency is 65%.
A. 0.90803
C. 0.80903
B.0.09083
D. 0.30890

A

B.0.09083

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28
Q

A power screw requires 5 HP to raise 3000 lbs load at a rate of 35 ft/min. Find the efficiency of the screw.
A.63.64%
C. 46.36%
B.64.63%
D. 36.46%

A

A.63.64%

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29
Q

The root diameter of a double square thread power screw is 0.60-in.The screw has a pitch of 0.3-in. Determine the major diameter.
A. 0.10 in
C. 0.20 in
B. 0.80 in
D. 0.90 in

A

D. 0.90 in

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30
Q

A double square thread power screw has a mean radius of 90 mm and pitch of 12 mm is used to lift a load of 90 kN. If the friction of screw is 0.14 and collar torque is 25% of input torque, find the input torque required.
* 1585.2 N-m
C. 1858.2 N-m
* 1582.2 N-m
D. 1285.2 N-m

A
  • 1582.2 N-m
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31
Q

An acme thread power screw that has a mean diameter of 28 mm and pitch of 6 mm is used to lift a load of 800 kg. If the friction on thread is 0.95, compute the torque needed to turn the screw.
A. 0.1236 kN-m
B.
C. 0.1326 kN-m
0.1623 kN-m
D. 0.1263 kN-m

A

0.1236 kN-m

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32
Q

A single square thread power screw has a lead of 7 mm and mean diameter of 35 mm. If it is used to lift a load of 30 kN and coefficient of friction of thread is 0.18, find the torque required to turn the screw.
* 0.1924 kN-m
* 0.1249 kN-m
* 0.1492 kN-m
* 0.1294 kN-m

A

0.1294 kN-m

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33
Q

The total torque required to turn the power screw is 55 N-m. If the linear speed of screw is 8 f/min and lead of 9 mm, determine the horsepower input of the power screw.

3 hp
2 hp
* 4 hp
* 5 hp

A

2 hp

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34
Q

The cylinder head of ammonia compressor core gasket are of 90 cm? and flange pressure of 100 kg/cm?. Find the torque applied on the bolt ifithe nominal diameter of bolt used is 3/5-in and there are 6 bolts.
A. 793 in-Ibs
C. 739 in-Ibs
B. 397 in-Ibs
D. 973 in-Ibs

A

B. 397 in-Ibs

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35
Q

A 14 cm x 18 cm air compressor has 6 bolts on cylinder head with yield stress of 450 MPa. If the bolt stress area is 0,14 in?, calculate the maximum pressure inside the cylinder.
A. 341.3 psi
C. 134.3 psi
B. 431.3 psi
D. 143.3 psi

A

D. 143.3 psi

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36
Q

Determine the diameter of the bolt required to tightly pack a joint if the working strength of the bolt is 95 kN and working stress is 85 MPa.
A. 1.06 in
C. 2.06 in
B. 3.06 in
D. 4.06 in

A

C. 2.06 in

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37
Q

Compute the working strength of 1.50-in bolt which is screwed up tightly in packed joint when the allowed working stress is 14,000 psi.
A. 12075 Ibs
C. 12750 Ibs
B. 12570 Ibs
D. 12057 Ibs

A

12075 Ibs

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38
Q

The stress area of UNC bolt is 0.75 in?, if the material used is carbon steel, find the applied load on the bolt.
* 2533.11 Ibs
C. 3325.11 lbs
* 3252.11 Ibs
D. 5233.11 Ibs

A

C. 3325.11 lbs

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39
Q

Determine the permissible working stress of UNC boits that has a stress are of 0.60 in?, if the material used is alloy steel.
* 12985.98 psi
C. 12115.98 psi
* 12981.11 psi
D. 12895.98 psi

A

C. 12115.98 psi

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40
Q

A pulley has an effective belt pull of 4 kN and an angle of belt contact of160 deg. The working stress of belt is 1.8 MPa. Find the thickness of belt to be used if the width is 320 mm and coefficient of friction is 0.30.
A. 21.2 mm
C. 22.2 mm
B. 12.2 mm
D. 11.2 mm

A

B. 12.2 mm

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41
Q

A compressor is driven by 25 kW motor by means of V-belt. The service factor for moderate shock load of 1.30 and the adjusted horsepower capacity of V-belt are 5 hp. Determine the number of belts required.
A. 8 belts
C. 7 belts
B. 6 belts
D. 9 belts

A

D. 9 belts

42
Q

A 3/8-in flat belt is 12-in wide and is used in 28-in diameter pulley rotating at 700 rpm. The specific weight of beit is 0.038 Ib/in?. The angle of contact is 160 deg. If coefficient of friction is 0.32 and stress is 380 psi, how much power can it deliver?
A. 113.4 hp
C. 112.4 hp
B. 112.3 hp
D. 114.3 hp

A

D. 114.3 hp

43
Q

Determine the belt length of an open belt to connect the 8 cm and 14 cm diameter pulley at a center distance of 50 cm.
A. 136.98 cm
C. 198.36 cm
B. 163.98 cm
D. 189.36 cm

A

A. 136.98 cm

44
Q

Find the angle of contact on the small pulley for a belt drive with center distance of 75-in. If pulley diameters are 9-in and 8-in, respectively.
* 137.12 deg
C. 173.12 deg
* 127.12 deg
D. 147.12 deg

A

C. 173.12 deg

45
Q

A nylon-core flat belt has an elastomer envelop 200 mm wide and transmits 70 kw at a belt speed of 30 m/s. The belt is used in a crossec configuration to connect a 280 mm diameter driving pulley to a 910 mi diameter driven pulley at a shaft spacing of 5 cm. Calculate the belt length and the angles of wrap.A.12.94m, 169.6 deg
C.94.11 m, 613.9
B.14.94 m, 391.6 deg
D. 11.94 m, 193.6 deg

A
45
Q

Compute the belt tensions based on a coefficient of friction of 0.35
A. 1.03 KN, 3.36 kN
C. 2.03 KN, 4.36 kN
B.3.03 kN, 4.46 kN
D. 4.03 kN, 5.46 kN

A
46
Q

A pulley 615 mm in diameter transmits 40 kW at 630 pm. The arc of contact between the belt and pulley is 140 deg, the coefficient of frictior between the belt and pulley is 0.30, and the safe working stress of the belt is 2.0 belt is 2.0 MPa. Calculate:A.The effective belt pull
2. The width of the belt used if its thickness is 7 mm.
* ,7.91 kN, 721 mm
C. 1.97 kN, 271 mm
* 8.91 kN, 127 mm
D. 9.91 kN, 712 mm

A

C. 1.97 kN, 271 mm

46
Q

The width of the belt used if its thickness is 7 mm.
* ,7.91 kN, 721 mm
C. 1.97 kN, 271 mm
* 8.91 kN, 127 mm
D. 9.91 kN, 712 mm

A

C. 1.97 kN, 271 mm

47
Q

A pulley has a belt pull of 3.0 kN. If 30 HP motor is used to drive the pulley, compute the belt speed, in ft/s.
A54.2 ft/sec
C. 52.4 ft/sec
B. 24.5 ft/sec
D. 42.5 ft/sec

A

B. 24.5 ft/sec

48
Q

A pulley has an effective belt pull of 4 kN and an angle of belt contact of160 deg. The working stress of the belt is 2.1 MPa. Find the thickness o the belt to be used if the width is 400 mm and the coefficient of frictior is 0.30.
7.39 mm
9.39 mm
* 8.39 mm
* 6.39 mm

A
49
Q

A pulley 580 mm in diameter transmits 60 kW at 650 pm by means o belt. Determine the effective belt pull.
* 3.0396 kN
C. 4.0396 kN
* 5.0396 KN
D. 6.0396 K

A
  • 3.0396 kN
50
Q

A belt connected pulleys has 12 cm diameter and 35 cm diameter. If the center distance is 60 cm, find the angle of contact of the smaller pulley.
A. 168 deg
C. 178 deg
B. 158 deg
D. 138 deg

A

B. 158 deg

51
Q

The torque transmitted in a belt connected 310 mm diameter pulley is 5 kiN-m. Find the power driving the pulley if belt speed is 25 m/s.
A. 608.5 kW
* C. 706.52 kW
B. 806.5 kW
D. 708.5 kW

A

B. 806.5 kW

52
Q

A 10 cm pulley turning at 650 rpm is driving a 24 cm pulley by means of belt. If the total belt slip is 6%, find the speed of the driving gear.
* 352.8 rom
C. 523.8 rpm
* 852.3 rom
D. 253.8 rpm

A

D. 253.8 rpm

53
Q

Determine the belt length of an open belt to connect the 5 cm and 10 cm diameter pulley at a center distance of 75 cm.
A. 471.3 cm
C. 174.3 cm
B. 714.3 cm
D. 417.3 cm

A
54
Q

Find the angle of contact on the small pulley for a bet drive with center distance of 73-In if pulley diameters are 7-in and 14-in, respectively.
A. 174 deg
C. 471 deg
B. 274 deg
D. 374 deg

A

A. 174 deg

55
Q

A 3-strand chain and sprocket turns 650 pm and has a service factor of
1.5. If 15 HP/strand chain is to be used, find the torque that the chain and sprocket can deliver.
* 242.4 ft-Ibs C. 422.4 ft-Ibs.
* 424.4 ft-Ibs D. 444.4 ft-Ibs

A

242.4 ft-Ibs

56
Q

A pump operates on ahead of 35 m, delivering 80 L/S of water at 80% efficiency. The pump is driven by a diesel engine by means of a chain and sprocket with a service factor of 1.4. If the horsepower per strand is 28, find the approximate number of strands needed.
A.4
B.3
C.2
D.1

A

D.1

57
Q

A certain farm equipment which requires 2500 N-m torque at 600 pmhas diesel engine to operate at 1600 pm as its prime mover. A No.60
roller chain with total length of 60 pitches and small sprocket of 24 teeth are to be used with operating temperature to remain constant at 40 deg C. Determine the number of teeth of larger sprocket.
A. 46 teeth
C. 56 teeth
B. 64 teeth
D. 76 teeth

A

B. 64 teeth

58
Q

A driving sprocket with 12 teeth drives another sprocket with 48 teeth by means of a chain having a pitch of ¾-in. If chain length is 75-in, find the center distance between sprockets.
A.25.89 in
C. 52.89 in
B. 35.89 in
D. 62.89 in

A

A.25.89 in

58
Q

A sprocket with 9.0-in diameter and pitch of 74-in drives another sprocket at standard center distance of 50 pitches. Find the diameter of larger sprocket.
A. 23 in
C. 33 in
B. 43 in
D. 53 in

A

C. 33 in

59
Q

A 20-teeth sprocket driving a 100 teeth sprocket a center distance of 38 pitches. Find the chain length, in pitches.

A.240.26 pitches
C. 340.26 pitches
B. 440.26 pitches
D. 140.26 pitches

A

D. 140.26 pitches

60
Q

A fan requires at least 6HO to deliver 19000 CFM of air running at 350 rpm. For a service factor of 1.20, find the designed horsepower of the
B.2.7 hp
C. 7.2 hp
A.4.7 hp
D. 7.4 hp

A

C. 7.2 hp

61
Q

À chain and sprocket has a pitch diameter of 30-in and width 90 teesavailable. Find the pitch of the chain.
A. 1.0469 in
C. 1.4069 in
B. 2.4069 in
D. 2.0469 in

A

A. 1.0469 in

62
Q

A chain and sprocket has a pitch diameter of 9.56-in and pitch of v-in.How many teeth are there in the sprocket?
A. 50 teeth
B. 40 teeth
C.60 teeth
D. 30 teeth

A
63
Q

A chain and sprocket has 24 teeth with chain pitch of ¾-in. If the sprocket turns 620 pm, find the speed of the chain.
* 15.5 ft/sec
* 13.5 ft/sec
* 14.5 ft/sec
* 12 ft/sec

A

15.5 ft/sec

64
Q

A chain and sprocket has 20 teeth with chain pitch of ¾¾-in. Find the pitch diameter of sprocket.
* 5.79 in
* 6.79 in
* 4.79 in
* 7.79 in

A
  • 4.79 in
65
Q

A flange coupling with bolt circle diameter of 260 mm uses 8 bolts, 25 mm diameter. The torque transmitted is 18 kN-m and compressive stress of boit is 18 MPa. Calculate the required flange thickness.
A. 38.46 mm
B.46.38 mm
C. 83.46 mm
D. 46.46 mm

A

A. 38.46 mm

66
Q

The total force of 130 KN is required for the flange coupling that has ad bolts and a shearing stress of 38 MPa for the bolt. Compute the required bolt diameter.
* 26.94 mm
* 56.94 mm
* 94.26 mm
* 46.94 mm

A

26.94 mm

67
Q

A turbine is connected to a generated by means of a Range coupling that has a bolt circle diameter of 520 mm. The generator Output is 50 MW, 3600 rpm and 85% efficiency. If there are 18 bolts, determine the force acting on each bolt.
* 34.33 kN
* 33.34 KN
* 43.33 kN
* 42.33 kN

A
  • 33.34 KN
68
Q

If the weight of 6” diameter by 48” long SAE 1030 shafting is 174.5 kg.A.then what will be the weight of chromium SAE 51416 of same size?
305.79 lbs
426.70 Ibs
* 347.96 Ibs
* 465.89 Ibs

A
68
Q

A 50 inches diameter diamond saw blade is mounted on a pulley driven
Steel shaft, requiring a blade peripheral linear speed of 150 it/sec. Mane drive is 125 hp at 1,200 rpm, with 6 inches diameter pulley, Determine the shaft rpm to attain blade peripheral speed required.
B.716.2 rpm
C. 539.10 грт
A. 635.3 rpm
D. 687.55 rpm

A

D. 687.55 rpm

69
Q

A 100 mm diameter solid shaft is to be replaced with a hollow shaft equally strong (torsion) and made of the same material. The outside diameter of the hollow shaft is to be 27 mm. What should be the inside diameter? The allowable shearing stress is 41.4 MPa?
* 107.42 mm
* 105.82 mm
* 291.53 mm
* 109.60 mm

A
  • 107.42 mm
70
Q

A steel shaft operates at 188 rad/s and must handle 2 kW of power. The shearing stress is not to exceed 40 MN/m?. Calculate the minimum shaft diameter based on pure torsion.
* 9 mm
* 11 mm
* 13 mm
* 15 mm

A
  • 11 mm
71
Q

A round steel shaft transmits 373 watts at 1800 rpm. The torsional deflection is not to exceed 1 deg in a length equal to 20 diameters. Finc the shaft diameter.
* 6.53 mm
* 8.72 mm
* 12.84 mm
* 18.16 mm

A
  • 6.53 mm
72
Q

What factor of safety is needed for a 2 in. diameter shaft with ar ultimate strength of 50,000 psi to transmit 40,000 in-Ib torque.A.2.25
C. 2.14
B.
1.95
D. 2.62

A

B.1.95

73
Q

A tubular shaft, having an inner diameter of 30 mm and an outer diameter of 42 mm, is to be used to transmit 90 kW of power.Determine the frequency of rotation of the shaft so that the shear stress cannot exceed 50 MPa.
* 26.6 Hz
* 20.6 Hz
* 97.5 Hz
* 66.5 Hz

A

26.6 Hz

74
Q

Two circular shafts, one hollow and one solid, are made of the same material and have diameters as follows: hollow shaft inside diameter is one-half of the external diameter. The external diameter is equal to the diameter of the solid shaft. What is the ratio of the twisting moment of the hollow shaft to that of the solid shaft?
C. 9/16
A. 1/4
D. 15/16
B. 1/2

A

D. 15/16

75
Q

Determine the thickness of a hollow shaft having an outside diameter of100 mm If it is subjected to a maximum torque of 5,403.58 N-m without exceeding a shearing stress of 60 MPa or a twist of 0.5 degree permeter length of shaft. G = 83,000 Mpa.
C. 16.8 mm
A. 15 mm
D. 14.2 mm
B. 86 mm

A

A. 15 mm

76
Q

A hollow shaft with outside diameter of 14 cm, and wall thickness of 0,8 cm. transmits 200 kW at 500 pm. What must be the angular defiectior of the shaft if the length is 5 meters? The material of the shaft is C414C steel.

21.24 rad
21.71 rad
L. 30.80 rad
D. 17.37 rad

A
77
Q

A 1 % in. by 7/8 in. key is to be designed for a 12.7 cm shaft which win transmit power of 150 kW at 360 pm. If the allowable shear stress for the key is 920 kg/cm and the allowable compressive stress is 1300 kg/cmt, determine the length of key to be used
2.41 cm
6. 4,42 cm
2.73 cm
D. 4.79 cm

A

4,42 cm

78
Q

A pulley is keyed to a 2 and 1/2 inches diameter shaft by a 7/16 in x 3 in. flat key. The shaft rotates at 50 pm. The allowable shearing Stress for the key is 22 ksi. The allowable compressive stress for the key, hub and Shaft are 66 ksl. 59 ki and 72 ksi, respectively, Determine the maximum torque the pulley can safety deliver.
48398.4 in-Ib
C. 51562.5 in-Ib
54140.6 In-lD
D. 67495.2 in-ib

A

D. 67495.2 in-ib

79
Q

A rectangular key was used in a pulley connected to a line shaft with a power of 8 KW at a speed of 1200 pm. If the shearing stress of the Shaft and key are 30 M/mm” and 240 M/mm’, respectively. What is the diameter of the shaft?

22.2 mm
21.7 mm
* 25.8 mm
* 30.2mm

A

22.2 mm

80
Q

A line shaft with a power of 150 kW at a speed of 1200 pm, had a rectangular key used in its pulley connection. Consider the shearing stress of the shaft to be 40 N/mm and the key to be 200 N/mm, determine the shaft diameter
i
66.62 mm
53.31 mm
* 40.82 mm
* 44.94 mm

A

53.31 mm

81
Q

A cylinder having an internal diameter of 20 in and an external diameter of 36 in is subjected to an internal pressure of 10,000 psi and an external pressure of 2,500 psi. Determine the hoop stress at the inner surface of the cylinder.

24,705.16psi
19,028.52psi
* 13,142.86 psi
* 11,696.43 psi

A
  • 11,696.43 psi
82
Q

A thin walled cylindrical pressure vessel is subjected to internal pressure which varies from 750 ka to 3550 ka continuously. The diameter of the shell is 150 cm. Find the required thickness of the cylinder wall based on yield point of 480 MPa net endurance limit of 205 MPa an a factor of safety of 2.5.
21.2 mm
22.21 mm
* 23.83 mm
* 20.72 mm

A

23.83 mm

83
Q

A compression ring is to be used at the junction of a conical head and shell. Determine the required area of the compression ring if the pressure is 50 psi and the stress is 13750 psi. Assume efficiency of the joint is 80%.
0.00715 d
C. 0.00721 d°
B. 0.00482 g
D. 0.00682 d2

A

0.00715 d

84
Q

A cylindrical vessel measuring (2 ft x5 ft) holds a gas at 2’he plate witng stainless steel 0QT 12000, determine the thickness d feoint as 85%. 250) a design factor of 1.4 yield. Assume efficiency of welded joint as
0.549 in
0.455 In
* 1.2 in
* 0.3 in

A
85
Q

A spherical shell of 1.8 m of outside diameter and 1.725 m inside at a pressure of 10.4 MPa. Compute the stress in the shell.
124.8 MPA
119.6 MPa
* 96.48 MPa
* 88.46 Mpa

A

119.6 MPa

86
Q

A thin hollow sphere of radius 10” and thickness 0.1” is subjected to an internal pressure of 100 sig. The maximum normal stress on al element of the sphere Is:

5,000psi
7,070psl
6. 14,140psi
2,500psi

A

5,000psi

87
Q

Pressurized water at 1.37 Ma is stored in a steel cylindrical tank 1.4 meters in diameter. If the allowable tangential stress is 8.5 MPa, find the required wall thickness of the tank.

123.6 mm
130.5 mm
6. 112.9 mm
D. 135.1 mm

A

. 112.9 mm

88
Q

The collar of the capstan has an outside diameter of 8 in and an inside diameter of 6 in. the total load supports is 2000 lb. If the coefficient of friction is 0.1,what is the collar friction torque.

705 in-lb
c. 1012 in-l
802 in-Ib
D. 972 in-Ib

A

705 in-lb

89
Q

A disc clutch has 6 pairs of containing friction surfaces. The frictional radius is 2-In and the coefficient of friction is 0.3. An axial force of 100 lb acts on the clutch. The shaft speed is 400 rpm. How much horsepower can the clutch transmit?

2.28 hp
C. 5.2 hp
3.12 hp
D. 4.51 hp

A

2.28 hp

90
Q

A cone clutch has an angle of 10 degrees and a coefficient of friction of
0.42. Find the axial force required if the capacity of the clutch Is 7.46 kW at 500 pm. The mean diameter of the active conical section is 300 mm.
i
0.40332 kN
0.3928 kN
* 0.2453 kN
* 0.2384 Kn

A

0.3928 kN

91
Q

A pulley 610 mm in diameter transmits 40 kW at 500 RPM. The arc of contact between the belt and pulley 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

2,505 N
C. 4,528 N
3,931 N
D. 2,823 N

A
92
Q

An engine of a motor vehicle with a wheel dlameter of 712 mm
develops 50 kW at 2,000 rpm. The combined efficiency of the differential and transmission is 75 % with an overall speed reduction oi 25 is to 1. Determine the torque to be delivered by the clutch in fem.
239 -m
359 N-m
C. 432 N-m
U. 471 N-m

A

239 -m

93
Q

An engine of a motor vehicle with a wheel diameter of 712 mi
develops 50 kW at 2,000 pm. The combined efficiency of the differential and transmission is 75% with an overall speed reduction al km/hr.
25 is to 1. Determine the speed reduction of travel of the vehicle in km/h

10.74
11.69
12.58
13.80

A

10.74

94
Q

multiple disc clutch of 10 steel disc and 9 bronze disc. The effective outside and inside diameters are 20.32 cm and 15.24 cm, respectively.
If the axial force of 450 Newton is applied and the shaft turns at 120C
0.27. rpm, find the horsepower capacity. Assume a coefficient of friction of
39.566 hp
40.482 hp
С. 37.458 Кр
D. 35.659 hp

A

39.566 hp

95
Q

An engine develops 40 kW at 1200 pm, with a single plate clutch witt two pairs of friction surfaces transmitting the power.
Consider the
coefficient of friction to be 0.30 and mean diameter of disc to be 20C mm, determine the axial force required to engage the clutch and transmit the power.
4.832 kN
5.305 kN
* 3.693 kN
* 6.922 kN

A

5.305 kN

96
Q

In a shearing machine the energy is 29,264 ft-lb, the ultimate shearing stress of the steel plate is 40,000psi, the plate thickness is 1 inch the length of the plate which can be sheared is:

7055 in
C. 12.75
10.55 in
D. 17.56

A

D. 17.56

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