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What are the advantages and disadvantages of pneumatic actuators in comparison with electric motors in process control applications? A pneumatic rack-and-pinion actuator is an on/off device that is used as a rotary valve actuator. A piston or diaphragm in the actuator is moved by allowing compressed air into the valve chamber. This rectilinear motion is converted into rotary motion through a rack-and-pinion device in the actuator. Single-acting types with springs return and double-acting types are commercially available. Using a sketch, explain the operation of a piston-type single-acting rack-and-pinion actuator with a spring-restrained piston. Could the force rating, sensitivity, and robustness of the device be improved by using two pistons and racks coupled with the same pinion? Explain.
a 12 kn force is exerted on a rocker arm. the moment of inertia i of the crosssectionnbspwith respect to the
Design a heat sink that will dissipate as much heat as possible - if it is assumed that the base plate is kept at a constant temperature of 380K - Advantages and disadvantages of using CFD as opposed to other methods for this project.
Even when the system supports blocking semaphores, starvation might happen to the low-priority threads. Describe the sequence of events that causes starvation.
Rigid steel tank with a volume of 1 m3 contains 2 kg of H2O initially at 400 kPa. Determine the initial temperature of the H2O
The lighting requirements of an industrial facility are being met by 700 40-W standard fluorescent lamps. The lamps are close to completing their service life and are to be replaced by their 34-W high-efficiency counterparts that operate on the exist..
the nozzle shown discharges a sheet of water through a 180 degree arc. the water speed is 15 ms and the jet thickness
a steam power plant operates on a rankine cycle between pressure limits of 0.08 bar and 80 bar. the heat added by
The operating speed ranges from 1200 rpm (idle) to 5000 rpm (red line). Choose the remaining parameters so that the whirling amplitude is never more than 1 mm.
Methane burns with 90% of theoretical air to form an equilibrium mixture of CO2, CO, H2O(g), H2, and N2 at 1000 K, 1 atm. Determine the composition of the equilibrium mixture, per kmol of mixture.
Determine the flow coefficient and stage loading factor at the mean radius and the reaction at the hub, radius 0.31 m, at the design speed of 8000 rev/min, given that stage is to have a free-vortex swirl at this speed. You may assume that losses a..
Determine the uniform tube wall surface temperature for these conditions. 0.050 kg/s. If a particular drying process requires approximately 1 kg/s of air at 75°C,
Determine the transfer functions from input voltage to angular velocity and from load torque to angular velocity for a PM DC motor rigidly connected to an inertial load. Assume resistance and inductance parameters Ra , La let the armature constant be..
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