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Engineering

Lydia Rosario

A 25-W compact fluorescent lightbulb (CFL) produces the light equivalent of a 100-W incandescent bulb. The population of North America is estimated to be about 305 million. Estimate the amount of coal needed to light one 100-W incandescent lightbulb for each person for one year and the amount of coal that would be saved if each incandescent bulb were replaced with a CFL. Assume the coal has a NHV of 28.5 MJ · kg-1 and the power plants are 33% efficient.

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Engineering

Bruno Medina

Technician A says that gear lube and bearing grease cannot be substituted due to the different housing and seal designs each lubricant demands in a vehicle. Technician B says that gear lube is thicker than bearing grease. Who is correct?

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Engineering

Marco Beasley

What is the power of a motor that is supplied 460 volts at 4.6 amps and the horsepower is 5hp?

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Engineering

Johnson

The purifier is a device in a) - The air separation plant b) - steam power plant c) - - fuel cell d) - refrigerator

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Engineering

Marques Fletcher

Five kg of water is contained in a piston-cylinder assembly, initially at 5 bar and 300°C. The water is slowly heated at constant pressure to a final state. The heat transfer for the process is 3560 kJ and kinetic and potential energy effects are negligible.

Determine the final volume, in m3, and the work for the process, in kJ.

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Engineering

Malia Middleton

A 1'x1' square concrete pile is embedded 20 feet in clay with an undrained shear strength of 2,800 psf. Based on the LaTeX: / alphaα-method and LaTeX: / alphaα-values of Terzaghi et al. (1996), what is the ultimate shaft friction, Qs in pounds? Use pa=2,000 psf.

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Engineering

Payten Stanton

What are the characteristics of carbon fibre?

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Engineering

Gael Reilly

Write the equation for the output voltage as a function of the input voltage (sketch a circuit defining your variables). The maximum current coming out/into the op-amp output (terminal 6) is approximately 20 mA. Plot the output voltage derived from your model as a function of the input voltage (for the input sinusoidal, the range of the input voltage is [0.1V, 0.9V]).

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Engineering

Davis Hodge

Select the correct answer from each drop down menu.

What does Hooke's Law explain?

If the external force is larger than the

(1.) size

(2.) volume

(3.) elastic limit

of material, it may result in permanent deformation in the shape and size of the object. This characteristic is known as the

(4.) material behavior

(5.) elastic behavior

(6.) plastic behavior

of an object.

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Engineering

Sydnee

As the porosity of a refractory ceramic brick increases:

(A) strength decreases, chemical resistance decreases, and thermal insulation increases

(B) strength increases, chemical resistance increases, and thermal insulation decreases

(C) strength decreases, chemical resistance increases, and thermal insulation decreases

(D) strength increases, chemical resistance increases, and thermal insulation increases

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Engineering

Kaylen Villarreal

What is EL Niño?

A. When the Eastern Pacific Ocean is coon than normal and causes climate changes.

B. When the Eastern Pacific Ocean is warmer than normal and causes more storms.

C. When the Atlantic Ocean is colder than normal and no weather changes.

D. When the Atlantic Ocean is warmer than normal and causes drought.

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Engineering

Maximus

A bar having a length of 5 in. and cross-sectional area of 0.7 i n. 2 is subjected to an axial force of 8000 lb. If the bar stretches 0.002 in., determine the modulus of elasticity of the material. The material has linear elastic behavior.

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Engineering

Zion Lopez

How does a car batteray NOT die?

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Engineering

Bridgett

9. A beginning service technician earns $400 per week. How much should the technician spend on vehicle payment?

a. $400 per month

b. $500 per month

c. $800 per month

d. $1000 per month

10. Which activity does not allow a person to perform any work while at the shop?

a. Cooperative education program

b. Apprenticeship program

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Engineering

Ingrid Hines

A tank with a volume of 8 m3 containing 4 m3 of 20% (by volume) NaOH solution is to be purged by adding pure water at a rate of 3 m3/h. The solution leaves the tank at a rate of 2 m3/h. When the tank is full, the solution leave the tank at the same inlet flow of 3 m3/h. Assume perfect mixing. Specific gravity of pure NaOH is 1.22. Determine the time necessary to purge 95% of the NaOH by mass from the tank.

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