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Engineering

What is the expected as-cooled microstructure of a eutectoid steel that experiences the following cooling path: (1) Cooled instantly from 800oC to 630oC (2) Held at 630oC for 10 seconds (3) Cooled to 400oC and held for 200 seconds (4) Quenched to room temperature.

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Engineering

Refrigerant 134a is compressed with no heat transfer in a piston-cylinder assembly from 30 lbf/in. 2, 20F to 160 lbf/in. 2 The mass of refrigerant is 0.04 lb. For the refrigerant as the system, W 0.56 Btu. Kinetic and potential energy effects are negligible. Determine the final temperature, in F

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Engineering

List 3 types of heat exchangers, and classify them?

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Engineering

A cast-iron pipe 2.0 ft in diameter and 200 ft long joins two water (60°F) reservoirs. The upper reservoir has a water-surface elevation of 155 ft, and the lower on has a water-surface elevation of 45 ft. The pipe exits from the side of the upper reservoir at an elevation of 120 ft and enters the lower reservoir at an elevation of 25 ft. There are two wide-open gate valves in the pipe.

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Blaine Mitchell

Engineering

What is the importance of stairs and post of the house?

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Engineering

An airplane is flying in a straight line with a velocity of 200 mi/h and an acceleration of 3 mi/h2. If the propeller has a diameter of 6 ft and is rotating at an angular rate of 120 rad/s, determine the magnitudes of velocity and acceleration of a particle located on the tip of the propeller.

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Engineering

How does a 2.5 MW wind turbine costing $ 4 million compare to a 5-kw wind turbine $3 / W? a) Same $/w b) Smaller $/w c) Larger $/w

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Engineering

Determine if each of the following statements is true or false:

1. Larger atoms are better nucleophiles due to polarizability.

2. The identity of the nucleophile affects the rate of an SN1 reaction.

3. SN2 reactions proceed via frontside attack.

4. Bimolecular reactions tend to be stereoselective.

5. SN2 reactions invert all stereocenters in a haloalkane.

6. Cl-, OH-, and H - are good all leaving groups.

7. Good bases tend to be good nucleophiles

8. Branching adjacent to a reacting carbon slows SN2 reactions due to steric hindrance.

9. SN1 reactions are slowed by hyperconjugation of the carbocation intermediate.

10. The rate determining step for SN1 reactions is the same as the rate determining step for E1 reactions.

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Engineering

A 3 m aluminum pole is kept at a residential site for construction

purposes at 25°C. At night, the temperature of the surroundings drops

to 2°C. What is the final length of the aluminum pole? Given the thermal

coefficient of aluminum als 23 10 °C

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Engineering

A wheel is used to turn a valve stem on a water valve. If the wheel radius is 1 door and the axle radius is. 5 inches, what is the mechanical advantage of the wheel and axle?

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Engineering

Which of the following is an easy way to remember the modified "X" tire rotation?

A. Nondrive wheels straight, cross the drive wheels

B. Drive wheels straight, cross the nondrive wheels

C. Drive wheels crossed, nondrive wheels straight

D. Drive wheels crossed, nondrive wheels crossed

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Jaliyah Hoffman

Engineering

12. In a rear-wheel drive (RWD) system, the rear axle

the vehicle.

A. pushes

Bruns

C. pulls

D. leads

Mark for review (Will be highlighted on the review page)

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Engineering

A certain battery has terminals labeled a and b. The battery voltage is vab = 12 V. a) To increase the chemical energy stored in the battery by 900J, how much charge must move through the battery? b) Should electrons move from a to b or from b to a?

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Catherine Fernandez

Engineering

Fluorescent troffers are a type of _ lighting fixture

a surface-mounted

b. recessed

c. suspended

d. track-mounted

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Engineering

For a DC coupled amplifier with a single high frequency pole, the phase of the gain approaches 90 degrees at frequencies well above the upper corner frequency. True or false?

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