Certain farm equipment which requires 2200 Newton-meter torque at 500 rpm has a diesel engine to operate at 1500 rpm as its prime mover. A number 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 number of strands if the horsepower rating per strand is 25.95 hp. Use a service factor of 1.4. a) 1 strand b) 3 strands c) 7 strands d) 9 strands

Certain farm equipment which requires 2200 Newton-meter torque at 500 rpm has a diesel engine to operate at 1500 rpm as its prime mover. A number 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 number of strands if the horsepower rating per strand is 25.95 hp. Use a service factor of 1.4. a) 1 strand b) 3 strands c) 7 strands d) 9 strands

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.70P: Solve Sample Problem 7.16 if the contact pressure under the polisher varies parabolically from p0 at...

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Certain farm equipment which requires 2200 Newton-meter torque at 500 rpm has a diesel engine to operate at 1500 rpm as its prime mover. A number 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 number of strands if the horsepower rating per strand is 25.95 hp. Use a service factor of 1.4.
A belt is to transmit 50 kW power to a machine. The sheave is 10 inches in diameter and turns at 1200 rpm, while the larger sheave turns at 500 rpm. Determine the design HP if a service factor of 1.35 and a correction factor of 0.85.
A 5 hp motor with a speed of 900 rpm is used to drive an industrial fan with a velocity of 5.72m/s. The center distance between the sprockets is 1.5 times the diameter of driven sprocket andis equal to 630 mm. Determine the length of chain in pitches. Use RC 40 chain and service factorof 1.3.
Design a typical rigid flange coupling for connecting a motor and a centrifugal pump shafts. The coupling needs to transmit 15 KW at 1000 rpm. The allowable shear stresses of the shaft, key and bolt materials are 60 MPa, 50 MPa and 25 MPa respectively. The shear modulus of the shaft material may be taken as 84GPa. The angle of twist of the shaft should be limited to 1 degree in 20 times the shaft diameter. Note: show complete solution
A belt drive is used to transmit power from an electric motor to a compressor for a refrigerated truck. The compressor must still operate when the truck is parked and the engine is not running. The 50-hp electric motor is rated at 150+X rpm (where value of X = 50), and the motor sheave diameter is 5+d1 in. (where value of d1 = 5). The compressor sheave has 8+d2 in (where value of d2 = 5) diameter. The center distance of the drive is 15 in. Determine the appropriate industrial V belt size, the length of belt, operating speed of compressor and belt speed.
A 3-strand chain and sprocket turns 650 rpm 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. (Ans. 242.4 ft-lbs)
A 6-in-wide polyamide F-1 flat belt is used to connect a 4-in-diameter pulley to drive a larger pulley with an angular velocity ratio of 3. The center-to-center distance is 8 ft. The angular speed of the small pulley is 1850 rev/min as it delivers 2 hp. The service is such that a service factor Ks of 1.25 is appropriate. (a) Find Fc, Fi, F1a, and F2. (b) Find Ha, nfs, and belt length. (c) Find the dip.
The preliminary design of a large shaft connecting a motor with agenerator requires the use of a hollow shaft with inside and outside diameters4 in. and 6 in., respectively. Taking a safety factor of 2.5 andknowing that the shear resistance is 14 ksi, determine the maximumtorque that can be transmitted by the shaft as designed
8. Design a clamp coupling for transmitting 25 kW at 300 rpm. Allowable shear stresses in shaft and key are 50 MPa and 45 MPa, respectively. The number of bolts joining the two halves of muff is 4. The permissible tensile stress in the bolt is 70 MPa and the permissible crushing stress in the key is 90 MPa. The coeffi cient of friction between the muff of the CI and the shaft of steel is 0.20.
1. A pulley 580 mm in diameter transmits 60 kW at 650 1pm by means of belt. Determine the effective belt pull.2. 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 18 m, respectively.
Question 2 A load of 1.8 kN is hoisted by means of a rope on a lifting machine with a rotational frequency of 40 revolutions per min, and a drum whose diameter is 600 mm. Calculate the following: a) The power required for the load. b) Efficiency of the lifting machine, if an electric motor of 8kW is required to drive the lifting machine.
A bushed pin type flexible coupling is used to transmit 10 kW power at 720 rpm. The design torque is 150% of rated torque. The keys have square cross-section. The permissible stresses are: For shaft and key material, τ = 66.67 N/mm2, σc = 200 N/mm2; For pin material, τ = 35 N/mm2, σt = 133 N/mm2; For flange material τ = 16.67 N/mm2. The permissible bearing pressure for rubber bushes is 1 N/mm2. The number of bushes is 4. Design the bushed pin flexible coupling.