Mechanical Engineering

Solution Library


Give the Inlet and Outlet Valves for Controlling a Compressor

Question A compressor has one degree of freedom more than a pump because the fluid is compressible instead of incompressible. So for a pump we can use one independent variable and set up a feedback control loop using any of the following dependent variables: flow rate (either outlet or inlet, they ... Read More

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Calculate the Pressure and Velocities in the Flow System

Question Consider the flow system shown in the diagram and following additional information. The following are known values: all pipe segment lengths, the friction factors for all fittings, the pressure in the vapor space of D-10 1 and the pressure in the vapor space of D-102. Also known is the dia ... Read More

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Multiple Choice Questions Applied Statistics

Question (1) Which is not a name for process variables which affect one or more output variables?A. Manipulated VariablesB. Disturbance VariablesC. Input VariableD. Controlled Variables(2) The number of process variables that can be controlled independently is known as theA. Model degrees of freedo ... Read More

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Effect of Material Change in Storage Tank

Question Liquid levels in the storage tank are frequently determined by measuring the pressure at the bottom of the tank. In one such tank the material stored in the tank was changed and an overflow resulted. Why?Summary The question belongs to Mechanical Engineering and it is about material chang ... Read More

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Temperature Control of a Reactor

Question An operator was told to control the temperature of the reactor at 60°C. The operator set the set point of the temperature controller at 60. The scale actually indicated 0-100% of the temperature range of 0-200°C. This caused a runaway reaction which over pressurized the vessel. Liq ... Read More

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Proper Fail-Safe Action Valve in a Heat Exchanger

Question Specify the proper fail-safe action for the valves in the following services. Please explain your reasons. A flammable solvent is heated by steam in a heat exchanger. The valve manipulates the flow of the steam to the exchanger. _____________Summary The question belongs to Mechanical Eng ... Read More

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Fail Safe Action Valve for Reactor Vessel

Question Specify the proper fail-safe action for the valves in the following services. Please explain your reasons.A valve manipulates the flow rate of reactant to a reactor vessel. The reaction is exothermic.____________________________.Summary The question belongs to Mechanical Engineering and i ... Read More

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Fail Safe Action Valve for Reactor Vessel where reaction is Endothermic

Question Specify the proper fail-safe action for the valves in the following services. Please explain your reasons.A valve manipulates the flow rate of reactant to a reactor vessel. The reaction is endothermic._____________________________________. Summary The question belongs to Mechanical Engin ... Read More

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Fail Safe Action Valve Controlling Natural Gas

Question Specify the proper fail-safe action for the valves in the following services. Please explain your reasons.A valve manipulates the flow of natural gas (combustible) to a furnace. Another valve manipulates the flow of combustion air to the same furnace._____________________________________. ... Read More

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Calculate the Flow rate of Hydrocarbon Stream

Question Calculate the flow rate in gpm of a hydrocarbon stream (specific gravity equal to 0.65) though a 3-inch equal percentage valve that is 40% open based on stem position for the Cv given in Table 1 and the installed pressure drop in table 2. Summary The question belongs to Mechanical En ... Read More

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Locate the Fail Safe Valve in the Design

Question In the following figure, ethylbenzene flows at 1000 gpm and 445°F. The frictional pressure drop between point 1 and 2 is 13psi.(a) Please recommend a proper location for the control valve(b) Please calculate the pressure drop across the control valve.  Summary The question belon ... Read More

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Control of Ethanol Production for Motor Oil Manufacture

Question Grains, such as com and sorghum are used to produce ethanol for use in motor oil. A process for producing ethanol from grains is shown in the following figure. Crushed grains, water and enzymes are added to the enzyme reactor and heated to approximately 140°F and held at this temperatu ... Read More

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