# Questions posted in Engineering

Asked By ella51

Engineering

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Engineering

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Engineering

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Engineering

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## Which of the following is equivalent to (5) Superscript seven-thirds? 5–4 54 RootIndex 7 StartRoot 5 cubed EndRoot RootIndex 3 StartRoot 5 Superscript 7 Baseline EndRoot

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Engineering

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## x+y=24 2x-y=-6

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Engineering

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## Which part of the overall part production has the largest cost by percentage?

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Engineering

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## What are the two functions of tires?

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Engineering

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## A bar of steel has the minimum properties Se = 40 kpsi, Sy = 60 kpsi, and Sut = 80 kpsi. The bar is subjected to a steady torsional stress of 15 kpsi and an alternating bending stress of 25 kpsi. Find the factor of safety guarding against a static failure, and either the factor of safety guarding against a fatigue failure or the expected life of the part. For the fatigue analysis use:

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Engineering

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## Consider a household that uses 23.8 kw-hour of electricity per day on average. (kw-hours is a measure of energy that will be discussed in detail in a later chapter. at this point we want to establish estimations.) most of that electricity is supplied by fossil fuels. to reduce their carbon footprint, the household wants to install solar panels, which receive on average 336 w/m2 from the sun each day. if the solar panels are 19.0% efficient (fraction of solar energy converted into useable electrical energy), what area of solar panels is needed to power the household

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Engineering

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## Class Period The first electricity producing wind turbine was invented in what year?* 5 points O 1776 O 1808 O 1888 1978 The BLADES

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Engineering

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## Which of the following are TRUE concerning rectifier circuits? Select all that apply. a. The output of an ideal full wave rectifier is zero volts only when the input is zero volts. b. Half-wave rectifier circuits need a minimum of 4 diodes to operate. c. In an ideal full wave bridge rectifier, half of the diodes are in the ON state and half of the diodes are in the OFF state at any given time the input voltage is not zero. d. The output of an ideal half wave rectifier is zero volts only when the input is zero volts. …

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Engineering

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## _____is audio that has been changed into patterns of numbers that can't be heard. A. Digital audio B. Analog audio C. Reel-to-reel audio tape A record Please select the best answer from the choices provided

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Engineering

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## A grade 5, 1-in. UNF bolt has rolled threads and is used to clamp two rigid members together so that kc = 4kb . In keeping with the fatigue treatment of ductile members given in Chapter 8, assume that the material has an idealized stress–strain curve, with a "square corner" at the yield strength (not the proof strength). There is a force tending to separate the members that fluctuates rapidly between 0 and 20,000 lb. The construction and pre- cision of manufacture are such that there is a possibility of slight bolt bending. Two val- ues of initial tension are …

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Engineering

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## A primary runway is being designed for a new airport to serve airport approach category B. As part of this work it is required to design two con- secutive vertical curves (a crest vertical curve followed by a sag vertical curve) to be located midway along the length of the runway. The design should satisfy all the grade and minimum length requirements. If conditions are such that the crest vertical curve connect grades of +.5% and +1.5%, determine all the properties of both curves that will be necessary to set out the curves. The elevation and station of the point …

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Engineering

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## A linear traverse begins on a point with known coordinates of (1678.37, 22765.22) and ends on a point with known coordinates (2067.77, 21342.12). The traverse has 6 legs and a total distance of 3,656.75? The coordinates are given in feet and (north, east) form. What will the sum of the final, balanced, departures be? a. +389.40 b.-389.40 c. +1423.10 d. -1423.10

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Engineering

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## Last casing: 7 5/8” 29.7 lb/ft ID 6.975” set and cemented at 8000 ft. The hole is vertical to this point. FIT Pressure: 2330 psi for 7 5/8" casing string Bit size: 6.5” Drill pipe: 5” 19.5 lb/ft ID 4.276” X-95 Premium Class BHA: 600 ft of 6” X 2” Drill collars 85.4 lb/ft Derrick is strung with 12 lines Traveling block weight: 20,000 lbs. Top Drive Weight: 35,000 lbs Triplex pump. 6.5” liners, 11 inch stroke. 95% efficiency Pump Rate: 100 strokes/minute Mud Weight: 9.8 ppg SG of Cuttings: 2.6 Washout: 0% The hole is at a 20 degree …

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Engineering

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## An unpeened helical compression spring made of oil tempered steel wire of diameter 0.15-in and mean coil diameter of 0.825-in. If the spring is preloaded with a compressive force of 5lb, determine the maximum compressive load the spring can carry if fatigue is to be estimated using Goodman criterion and Zimmerli data.

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Engineering

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## Plumbers, pipefitters, and steamfitters may be involved in a variety of maintenance and operations work, including: (Select all that apply.) maintaining septic systems. replacing oxygen pipes in hospitals. replacing faulty wiring. repairing cooling and heating systems in high-rise buildings.

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Engineering

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## A water treatment plant processes 30,000 cubic meters of water each day. A square rapid-mix tank with vertical baffles and flat impeller blades will be used. The design detention time and velocity gradient are 30 seconds and 900 s-1 Determine the power input, if the temperature of the water is 20°C. µ = 1 x 10-3 kg/m•s. 1kW = 1000 J/s, 1J = 1N•m = 1 kg•m2/s2. Note: you can use the equation in its current version.

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Engineering

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## Problem 1. SAE 50 oil flows at a mass flowrate of 0.007 kg/s through a 1-cm I.D. tube that is 1.5 m long. The wall temperature is at 300 K and the inlet oil temperature is 377 K. Calculate: (1) The average heat transfer coefficient, (2) the oil temperature at the outlet, and (3) the convective heat loss from the oil.

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Engineering

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## In a particular application involving fluid flow at a rate m` through a circular tube of length L and diameter D, the surface heat flux is known to have a sinusoidal variation with x, which is of the form q″s(x) = q″ₛ,ₘ sin(πx/L). The maximum flux, q″ₛ,ₘ, is a known constant, and the fluid enters the tube at a known temperature, Tₘ,ᵢ. Assuming the convection coefficient to be constant, how do the mean temperature of the fluid and the surface temperature vary with x? i.e. determine the equation for Tₘ(x) and Tₛ(x).

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Engineering

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## Design a PD controller to decrease the peak time by 1 2 from the peak time of the uncompensated system from question 1e while keeping the %OS the same. Find the following values to 5 significant digits. Ensure there are no rounding errors by storing variables. I. The new desired dominant pole location of the closed-loop system to achieve this time r

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Engineering

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## Solar energy stored in large bodies of water, called solar pounds, is being used to generate electricity. If such a solar power plant has an efficiency of 4 percent and a net power output of 350 kW, determine the average value of the required solar energy collection rate, in Btu/h.

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Engineering

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## As you discovered in lab last week, the advantage of CMOS logic is that no drain current flows through the MOSFETs when the output is either high or low. Because the CMOS logic family is based on the inverter, the logic functions of NOT, NAND, and NOR

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Engineering

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## An 18-in.-long titanium alloy rod is subjected to a tensile load of 24,000 lb. If the allowable tensile stress is 60 ksi and the allowable total elongation is not to exceed 0.05 in., compute the required rod diameter. Assume the proportional limit to be 120 ksi.

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Engineering

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## An inventor claims to have developed a food freezer that at steady state requires a power input of 0.25 kW to extract energy by heat transfer at a rate of 3000 J/s from freezer contents at 270 K. Investigate this claim for an ambient temperature of 293 K.

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Engineering

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## A window weighing 40 N was accidentally made 10 mm narrower than its frame. The coefficient of static friction between the window and the frame is 0.2. Compute the amount of force P that must be applied at the lower corner to keep the window from lowering.

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Engineering

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## You are comparing distillation column designs at 1 atm and 3 atm total pressure for a particular separation. You have the same feed in both cases, and the feed is a saturated liquid in both cases. The product specifications do not change, and the same reflux ratio is used in both cases. Compared to the design at 3 atm, the design at 1 atm will have: (Select one)a) more stages, fewer stages, the same number of stagesb) a larger diameter, a smaller diameter, the same diameterc) a higher reboiler temperature, a lower reboiler temp, the same reboiler temp

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Engineering

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## Consider an air compressor used in gas turbine engine. The compressor is being tested in laboratory facility. Air enters the compressor at the ambientpressure (1 bar) and temperature at a density of 1.2 kg/m3, with an average velocity of 1m/sthroughthe inlet area of 0.8m2. Air leaves the compressor at a pressure of 6 bar(absolute),with a density of 3.6kg/m3, through an exit area of 0.2m2. Calculate:a)the averageair velocity at the exit, and b)the magnitude and direction of the force required to keep the compressor fixed in its position.

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Engineering

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