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Engineering

A slip and fall prevention component should have which of the following elements?

A. Employee footwear program

B. Review and approval of walkways

C. A policy statement

D. All of the above

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Engineering

What do you mean by searching?

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Engineering

Intrinsic semiconduction is a property of a pure material. (True, False)

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Engineering

Consider a process in which a carbon-based fuel is combusted in the presence of 70% excess oxygen (assume that all of the oxygen present come from an air feel stream). Based on the information given above, which of the following statements are true? Select all that apply.

a. Exactly 70% of the oxygen presence in the process is not consumed.

b. 70% of the fuel in the process undergoes complete combustion.

c. At least 41% of the oxygen present in the grocers is not consumed

d. There is 70% more air present in the process that would be necessary for the complete combustion of all the fuel

e. There is 70% more oxygen present in the process that would be necessary for the complete combustion of all of the fuel

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Ashlee Patterson

Engineering

An insulated rigid tank contains 5 kg of a saturated liquid-vapor mixture of water at a. Initially, three-quarters of the mass is in the liquid phase. An electric resistor placed in the tank is connected to a 110-V source, and a current of 8 A flows through the resistor when the switch is turned on. (a) Determine how much time it will take to vaporize all the water in the tank, and (b) show the process on a T-v diagram with respect to the saturation lines.

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Engineering

A 5Kw solar system may produce enough energy to power your home. a) - True b) - False

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Engineering

Which of the following is NOT a part of a program block?

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Engineering

Gas at a temperature of 250°C with a convective coefficient 75 W/m2·K flows through a packed bed of aluminum (2024) spheres that is used as a thermal energy storage system. If the initial temperature of the spheres is 25°C and the diameter of each sphere is 75-mm, find the time, in seconds, required to for a sphere to reach 85% of the maximum possible thermal energy as well as the surface temperature and the centerline temperature at this time, both in °C. Evaluate the properties of the aluminum (2024) at 500 K.

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Engineering

1. A spur gear made of bronze drives a mid steel pinion with angular velocity ratio of 13 / 2 : 1. Thepressure angle is 14 1/2°. It transmits 5 kW at 1800 r. p. m. of pinion. Considering only strength, design the smallest diameter gears and find also necessary face width. The number of teeth should not be less than 15 teeth on either gear. The elastic strength of bronze may be taken as 84 MPa and of steel as 105 MPa. Lewis factor for 14 1/2° pressure angle may be taken as y = 0.6840.124 - No. of teeth.

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Engineering

Describe harmful effect associated with extraction of Aluminum, Gold and Copper. Discuss each individually.

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Engineering

A resistor, inductor and capacitor are connected in series, each with effective (rms) voltage of 65 V, 140 V and 80 V, respectively. If the resistor is rated at 24 W, what is the average power dissipated in the circuit

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Engineering

What does it mean to wire solar cells in parallel vs. wiring them in series? I always get these switched around.

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Engineering

28. List the 3 basic parts of a lamp?

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Engineering

Heating of Oil by Air. A flow of 2200 lbm/h of hydrocarbon oil at 100°F enters a heat exchanger, where it is heated to 150°F by hot air. The hot air enters at 300°F and is to leave at 200°F. Calculate the total lb mol air/h needed. The mean heat capacity of the oil is 0.45 btu/lbm · °F.

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Johanna Dickerson

Engineering

Determine the percent error in using the ideal gas model to determine the specific volume of (a) water vapor at 4000 lbf/in. 2, 10008F. (b) water vapor at 5 lbf/in. 2, 2508F. (c) ammonia at 40 lbf/in. 2, 608F. (d) air at 1 atm, 5608R. (e) Refrigerant 134a at 300 lbf/in. 2, 1808F.

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