A mixer operating at steady state has two inlets and one outlet.

- At inlet 1, superheated water vapor at 2 bar and 200°C flows with an average velocity of 1m/s

- At inlet 2, saturated water with a quality of x = 0.5 at 2 bar flows with an average velocity of 1m/s

- At the outlet, saturated water with a quality of x = 0.7 flows through a pipe 5 cm in diameter.

a) Calculate the mass flow rate through the outlet pipe.

b) Calculate the rate of heat loss to the surrounding from the mixer.

What is the process for reversing a DC motor?

What is a stepper motor and give some examples of where a stepper motor may be utilized.

Transformers are very efficient devices with efficiencies of typical distribution and power transformers approaching 96 to as high as 99 percent. List three causes that can reduce transformer efficiencies

Suppose a vertical pipe is to be used as part of a system to manually cycle nutrients upward from the floor of a lake. (Many lakes do this naturally, some do not. Green Lake, near Syracuse, NY, is one such lake.) A pump is to be installed on the lake floor at the base of the pipe. The base of the pipe will have a diameter of 9 cm. The nozzle of the pipe at the top will have a diameter of 4 cm. The lake is 59 m deep at the installation point. (Ignore any viscosity.)

f.)Write an equation that expresses the heat current H of conduction through the ice as a function of the thickness h of the ice sheet (of area A) already formed. Assume the air temperature is a constant -10 ?C, and that the temperature of the bottom of the ice sheet is 0 ?C.

(g) (1 point) Since H = dQ dt , use your answer to (f) to express the amount of heat dQ conducted through the ice sheet in time dt.

(i) (2 points) Express the amount of heat dQ that must be removed from the water at the bottom of the ice sheet to freeze the mass dm you found in (g).

(j) (2 points) Based on (g) and (i), set the expressions for dQ equal to each other to obtain a differential equation relating the heat that must be removed to freeze a new layer to the heat conducted through the ice sheet.

(k) (2 points) Separate variables, and integrate to find the thickness h of the ice sheet as a function of time t. (Note that h = 0 when t = 0

Temperature has a relatively unusual effect on rubber. Assume that the rubber band is governed mainly by entropic elasticity, what do you expect about a stretched rubber band when heated? Why?

The percentage of hardwood concentration in raw pulp, the vat pressure, and the cooking time of the pulp are being investigated for their effects on the strength of paper. Three levels of hardwood concentration, three levels of pressure, and two cooking times are selected. A factorial experiment with two replicates is conducted, and the following data are obtained:

(a) Analyze the data and draw conclusions. Use ? = 0.05.

(b) Prepare appropriate residual plots and comment on the model’s adequacy.

(c) Under what set of conditions would you run the process? Why?

List the differences between deformation by twinning and deformation by slip in terms of (a) mechanism, (b) condition of occurrence and (c) consequences. Any reasonable answer is accepted. Limit your answer to 25 words for each difference.

If a velocity profile of a boundary layer is u= a+by+cy^2, please calculate the value of a, b and c, using the boundary conditions.

Please show all steps. I am trying to understand the process. Thank you (:

Can someone explain how the heated concrete snow melting system works? mainly I need the formula used to express how the heat of the concrete melts the snow. Thank you

If the temperature inside a room is 25°C and the temperature outside is ?10°C:

a. What is the maximum relative humidity that can be accommodated inside the room before the window fogs over? (Assume the inside of the window is not insulated from the outside temperature).

b. If it is a double-pane window such that the inside of the window is perfectly insulated from the outside, what will the maximum relative humidity be?

A steel shaft is to be manufactured either as a solid circular bar or as a circular tube. The shaft is required to transmit a torque of 1200 N_m without exceeding an allowable shear stress of 40 MPa nor an allowable rate of twist of0.75°/m. (The shear modulus of elasticity of the steel is 78 GPa.).

Determine the required outer diameter do of the solid shaft [58.8 mm]

Determine the required diameter d2of the hollow shaft if thethickness t of the shaft is specified as one-tenth of the outer diameter. [67.7 mm]

Determine the ratio of diameters (that is, the ratio d2/d0) and the ratio ofweights of the hollow and solid shafts. [1.14, 0.47]

A gaseous mixture consists of 75 percent methane and 25 percent ethane by mass. 28,000 m³ of this mixture is trapped in a geological formation as natural gas at 150°C and 14 MPa. This natural gas is pumped 2000 m to the surface. At the surface, the gas pressure is 140 kPa and its temperature is 90°C. Using Kay’s rule and the enthalpy-departure charts, calculate the work required to pump this gas.

mechanical vibration

Consider a single cylinder engine such as the one shown here where r is the radius of crank (5.0 cm), l is the length of the connecting rod (16 cm), M_p is the effective mass of piston (1.5 kg), M is total mass of engine (75 kg), w is the engine speed (24p rad/s), k is the spring constant (220 KN/m), and z is the damping ratio (0.02). Assume that the crank and the remaining portion of the connecting-rod mass, which is considered concentrated at the crankpin, is balanced so that its center of gravity is at the axis of rotation O; determine

Equation of motion for the system

Exciting force of the engine and plot it for 30 seconds using 600 equal time intervals.

Absolute maximum steady-state amplitude of the engine

Plot the steady state time responses for the displacement and velocity of the engine for 30 seconds using 600 equal time intervals.

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