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Engineering

Dude

A researcher wants to determine if lead levels are different between the top of a glass of water and the bottom of a glass of water. Many samples of water are taken. From half, the lead level at the top is measured and from half, the lead level at the bottom is measured. Would this be a valid matched pair test?

a. No, as the lead levels cannot be accurately measured

b. No, as the measurements of top and bottom should be from the same glass

c. Yes, as long as there are an equal number of glasses in each group

d. Yes, as long as they are all from the same faucet

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Engineering

Allyson Massey

What do you do when there's a child in front of you?

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Engineering

Guest

A square isothermal chip is of width w = 5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated; the front surface is exposed to the flow of a coolant at T[infinity] = 15°C. From reliability considerations, the chip temperature must not exceed T = 85°C. f the coolant is air and the corresponding convection 200 W/m2 K, what is the maximum coefficient is h allowable chip power? If the coolant is a dielectric liquid for which h 3000 W/m2 K, what is the maxi - mum allowable power?

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Engineering

Mike Reese

Part of a good computer posture is to sit up straight with feet flat on the floor t or f

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Engineering

Gator

Plutonium isotopes undergo decay, producing heat. Plutonium isotope 239 (Pu-239) has 1.9 watts per kilogram [W/kg] of decay heat. How much heat, in units of calories [cal], will 1.25 moles [mol] of Pu-239 release after decaying for three hours [h]

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Engineering

Gabriel Downs

A 20 mm 3 20 mm silicon chip is mounted such thatthe edges are flush in a substrate. The substrate provides anunheated starting length of 20 mm that acts as turbulator. Airflow at 25°C (1 atm) with a velocity of 25 m/s is used to coolthe upper surface of the chip. If the maximum surface temperature of the chip cannot exceed 75°C, determine the maximumallowable power dissipation on the chip surface.

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Engineering

Sherlock

Describe the anodising process, with diagrams.

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Engineering

Tucker Horne

An 120 volt electric motor that draws 5 amps of current operates a winch that lifts a 100 kg. a distance of 300 cm. in 5 seconds.

Find work done by the winch, input power, output power, and efficiency of this system

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Engineering

Tara

Define the difference between yield stress and proof stress

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Engineering

Cecelia Bartlett

The maximum stress in a section of a circular tube subject to a torque is τmax = 22 MPa. If the inner diameter is Di = 3.75 cm and the outer diameter is Do = 5.5 cm, what is the torque on the section? Express your answer with appropriate units to three significant figures. View Available Hint (s)

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Engineering

Jesus Kane

Problem 2 (a) A sinusoid with a frequency of 2Hz is applied to a sampler/zero-order hold combination. The sampling rate is 10Hz. List all the frequencies present in the output that are less than 50Hz. (b) Repeat part (a) if the input sinusoid has a frequency of 8 Hz.

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Engineering

Mckay

What are the three broad classes of wiring methods?

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Engineering

Jaslyn

What is the four things all computer have in common

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Engineering

Mariam

If a licensed engineer is convicted of a crime that was substantially related to the practice of engineering, the board may take additional disciplinary action by:

a) Imposing a 3-year suspension of the license

b) Mandating a prison sentence

c) Revoking the license

d) All of the above

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Engineering

Deandre Vargas

Why are dynamic heads greater than static heads?

1. Because static suction lifts are limited in vertical lift

2. Because the friction losses are always greater than the

static heads

3. Because they are measured on the discharge side of the

pump

4. Because they include the static heads plus the friction

losses in the suction and discharge pipes

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