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Engineering

How does the thermal efficiency of an ideal cycle, in general, compare to that of a Carnot cycle operating between the same temperature limits?

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Engineering

What effect does friction have on a flexible system?

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Engineering

Engine oil (unused) flows at 1.81 x 10^-3 kg/s inside a 1-cm diameter tube that is heated electrically at a rate of 76 W/m. At a particular location where flow and heat transfer are fully developed, the wall temperature is 370K. Determine:

a. The oil mean temperature.

b. The centerline temperature.

c. The axial gradient of the mean temperature.

d. The heat transfer coefficient.

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Engineering

At a certain elevation, the pilot of a balloon has a mass of 120 lb and a weight of 119 lbf. What is the local acceleration of gravity, in ft/s2, at that elevation? If the balloon drifts to another elevation where g = 32.05 ft/s2, what is her weight, in lbf, and mass, in lb?

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Lilliana Barrett

Engineering

The total energy of a system remains unchanged during a cycle. a) - True b) - False

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Engineering

An adiabatic heat exchanger is to cool ethylene glycol (cp = 2.56 kJ/kg ºC) flowing at a rate of 2 kg/s from 80 to 40 ºC by liquid water that enters at 20 ºC and leaves at 55 ºC. Determine:

(a) the rate of heat transfer between the water and the ethylene glycol and

(b) the rate of entropy generation in the heat exchanger

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Engineering

Technician A says some coolant recovery systems are pressurized. Technician B says the coolant recovery system is used to keep air in the system. Who is right?

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Engineering

Water initially a saturated liquid at 150°C is contained within a piston-cylinder assembly. The water undergoes a process to the corresponding saturated vapor state, during which the piston moves freely in the cylinder. There is no heat transfer with the surroundings. If the change of state is brought about by the action of a paddle wheel, determine the net work per unit mass, in KJ/Kg, and the amount of entropy produced per unit mass in KJ/Kg*K.

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Engineering

Bridge A is the longest suspension bridge in a Country. Bridge B is 5555 feet shortershorter than Bridge A. If the length of Bridge A is m feet, express the length of Bridge B as an algebraic expression in m. Write an expression representing the length of Bridge B in terms of m.

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Engineering

A copper alloy cylinder 1.17 m long with a diameter of 32.39 mm is subjected to a tensile stress of 1,302 psi along its length. Assuming this applied stress is purely elastic calculate the diameter, in mm, of the cylinder under this load. For copper, the elastic modulus is 1,206,172 psi and the Poisson's ratio is 0.42.

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Engineering

In a piece of aluminum you want to make a pocket (milling of cavities), an end mill tool of 6 mm in diameter and 4 cutting sides will be used, the height of the cutting sides of the tool is 25 mm. The feed that will be taken per tooth will be 0.00003 meters / tooth, and a linear feed rate of 2.4 mm / second. Calculate the cutting speed in mts / min.

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Engineering

The bars of the truss each have a cross-sectional area of 1.25 in2. If the maximum average normal stress in any bar is not to exceed 20 ksi, determine the maximum magnitude P of the loads that can be applied to the truss.

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Engineering

Suppose you want to design a medical centrifuge to subject samples to normal accelerations of 1000 g's. (a) If the distance from the center of the centrifuge to the sample is 300 mm, what speed of rotation in rpm is necessary? (b) If you want the centrifuge to reach its design rpm in 1 min, what constant angular acceleration is necessary?

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Carissa Mendoza

Engineering

What is Not considered as metric system? a. Length b. Mass c. Time d. Volume e. Temperature

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Engineering

To operate a vehicle in Florida, you must

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