Which of the following more closely expresses the work done by a forklift to raise a load (100kg) vertically upwards (2m) from a starting position in 2sec? Assume: negligible losses (friction, leakage, etc.) associated with the process. C 200 J 1962 J C 981 J
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- The following are five different types of machoines 1. Pulley block 2. Lever 3. Worm and wheel 4. Incline plane 5. Screw Jack Discuss the operation of these machines. The discussion should include velocity ratio, mechanical advantage and efficiencyThe following are five different types of machines 1. Pulley block 2. Lever 3. Worm and wheel 4. Incline plane 5. Screw Jack Discuss the operation of these machines. The discussion should include velocity ratio, mechanical advantage and efficiency(10) The lead screw of a lathe has a 2.0-in Acme thread, 2½TPI. To drive the tool carriage, this screw must exert an axial force of 600lb. The thrust is carried on the collar 4½-in outside diameter & 2¼- in in inside diameter. The lead screw revolves 30rpm. Determine: (a) the efficiency of the screw & the collar, assuming ft = 0.15 & fc = 0.10 ; (b) the power to drive the screw.
- Given the following data, determine the number of trucks that would be required per shift to haul iron ores from the open pit to the milling plant. Hauling time per shift = 6 hours Truck Capacity = 35 MT rear dump truck Production rate per shift- 18,900 MT Total cycle time = 5.53 min. Assume efficiency of 50 productive minute per hour8.. An air blower is to deliver 40,000 ft3 /min. Two U-tube gages measure suction and discharge pressures. The suction gage reads a negative 2′′ of water. The discharge gage, located 3 ft above the point to which the suction gage is attached, reads +3′′ of water. The discharge and suction ducts are of equal diameter. What size motor should be used to drive the blower if the overall efficiency is 68% (γ = 0.0750 lb/ft3 for air)? indicate free body diagramWhat does it mean when we say that a lever operates at a mechanical disadvantage, and what benefits does such a lever system provide?
- discuss the power train of a four-wheel tractor and power tillers. Discusshow power is transmitted from the engine to the wheel of the tractor.The from-to chart below indicates the number of loads moved per 8-hr day (above the slash) and the distances in ft (below the slash) between departments in a particular factory. Fork lift trucks are used to transport the materials. They move at an average speed = 275 ft>min (loaded) and 350 ft/min (empty). Load handling time (loading plus unloading) per delivery is 1.5 min and anticipated traffic factor = 0.9. Availability = 95% and worker efficiency = 110%. Determine the number of trucks required under each of the following assumptions: (a) the trucks never travel empty; and (b) the trucks travel empty a distance equal to their loaded distance.Q1: Explain the significant role of Power and Free Conveyor Systems in modern manufacturing facilities. In your opinion, how the mode of control of power industrial trucks helps to handle the materials in different ways.
- Homework 6 -Problem I – As for the symbols of the work and haet, when is the work positive and when is the work negative? And when is the heat positive and when is the heat negative? 20 Homework 6 -Problem II - A volume of compressed air storage tank is 0.3m3, and the air pressure P1 in the tank is 1MP.. When a part of compressed air is used, the pressure P2 of the air in the tank decreases to 0.9 MPa. Set the room temperature at 20 ° C, calculate the mass of original air ml and the mass of residual air m2. Air gas constant Rg = 287.1 J/ (kg - K)). 21a.) A four-stroke reciprocating engine have a 2000 indicated horsepower. What would be the indicated mean effective pressure (lb/in^2) if the length of the stroke is 0.5 foot, and the area of the piston head is 28.27in^2. The engine runs at 2700rpm with 12 cylinders. b.) What would be the Friction Horsepower of the Engine in (a.) if its BMEP is 150 lb/in^2.By using a flat friction clutch, at 730 rpm with 30kW power a rotating electric motor will drive a work machine. Electric motor and work machine mass moments of inertia are 2.5 kgm2 and 10 kgm2, respectively. Work machine with a resistance of 380 Nm It has (load) moment. While the engine is rotating at 730 rpm, the work machine is loaded in 10 seconds Is this electric motor sufficient since it is requested to be activated? If not enough, become enough how do you get it?