Ultimate Engineering Study Guide - Questions & Answers

In a rectangular channel of 12 m wide, water flows at a rate of 150 m3/s. At the end of the channel there is a horizontal concrete apron which is also 12 m wide. On the apron, the water depth is 3m. Determine:
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A manometer that is filled with water (rho=1000 kg/m3) is connected to an air duct to measure the pressure inside the duct.The atmospheric pressure is 100 kPa. The difference in the manometer level is 10 mm. Determine the absolute pressure in the duct.
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With a 70-99% diameter reduction in a peripheral artery, the waveform characteristics around the stenosis would include
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To circulate air through the duct, a 60-W fan is used. The fan needs to raise the pressure of air by 50 Pa to maintain the flow. The fan is located in a horizontal flow section of the duct whose diameter is 30 cm at both inlet and the outlet. Determine the highest possible average flow velocity in the duct
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During the engineering design phase any previously unproven components should be further developed to the point where:
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During the recovery stage of heat treatment of a cold-worked material, the original, dislocation-free microstructure of the material prior to deformation is recovered. Group of answer choices True False
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A branch circuit is supplying a single hermetic refrigerant motor-compressor for an air conditioning unit. The hermetic refrigerant motor-compressor rated-load current is 18 amperes. If a 30-ampere fuse will not start the motor-compressor, the maximum rating of the branch-circuit short-circuit and ground-fault protective device may be increased to ___.
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What is the old Division and Section and the new Division and Level number for the exterior sanitary sewer system
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Technician A says engine vacuum is normally measured in inches of mercury (in. Hg). Technician B says a pressure gauge that is labeled psig will read 14.7 psi at sea level. Who is correct
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A round reinforcing bar constructed from cold-rolled steel and 320 mm long is required to support a tensile load of 65 kN. Determine the minimum cross-sectional area if the stress cannot exceed 240 MPa or elongate more than 0.42 mm.
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In addition to a proper air void system and strength level, a concrete mixture must contain durable _______________________ in order to perform adequately in a freeze-thaw service environment. A. Aggregates B. Fibers C. Reinforcing steel D. Honeycombing
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Wiring components are considered accessible when (1) access can be gained without damaging the structure or finish of the building or (2) they are ____.
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Resonance is a powerful phenomenon that engineers need to take into account when designing structures. In 2000, the Millennium Bridge in London began to wobble on its opening day, as the pedestrians began to synchronize their steps, first on accident, then on purpose to keep their balance as the bridge began to sway back and forth. In history, a number of bridge collapses have been attributed to resonance. Tall buildings are prone to the dangerous effects of resonance caused by earthquakes and the wind. Research and report on other bridge collapses or near collapses that have been caused by the effects of resonance. Required:How do modern engineers design bridges to prevent these disasters?
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b) Ammonia at a pressure of 40 lbf/in.2 has a specific internal energy of 308.75 Btu/lb. Determine the specific volume at the state, in ft3/lb.
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Technician A says that micrometers used in conjunction with a small hole gauge can be used to obtain a valve guide to valve stem measurement. Technician B says that dial indicators are sometimes used to measure valve guide to valve stem clearance. Who is correct
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An AC adapter for a telephone answering machine uses a transformer to reduce the line voltage of 120 V to a voltage of 6.00 V. The RMS current delivered to the answering machine is 670 mA. If the primary (input) coil of the transformer has 480 turns, then how many turns are there on the secondary (output) coil
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An equal-tangent crest vertical curve is designed for 50 mi/h. The initial grade is 3.6% and the final grade is negative. What is the elevation difference between the PVC and the high point of the curve
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The nozzle of a supersonic wind tunnel has an exit-to-throat area ratio of 6.79. When the tunnel is running, a Pitot tube mounted in the test section measures 1.448 atm. What is the reservoir pressure for the tunnel?
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x[n] is a sampled signal from a sinusoid signal xt=sin(t) with a period T= 18 seconds. The interval in time between samples is Tsample= 10 seconds/sample, what the value of x[2]?
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Two technicians are discussing torsion bars. Technician A says that many torsion bars are adjustable to allow for ride height adjustment. Technician B says that torsion bars are usually marked left and right and should not be switched side to side. Which technician is correct
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If a(n) ____ control switch is connected to the base, the depletion layer at one PN junction will _____ through the transistor.
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A centrifugal pump having an impeller diameter of 1 m is to be constructed so that it will supply a head rise of 240 m at a flowrate of 4.2 m3/s of water when operating at a speed of 1200 rpm. To study the characteristics of this pump, a 1/5 scale, geometrically similar model operated at the same speed is to be tested in the laboratory. Determine (a) the required model discharge and (b) head rise. Assume that both model and prototype operate with the same efficiency (and therefore the same flow coefficient).
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Identify three traditional building materials. Group of answer choices a. High strength plastics b. Stone c. Reinforced concrete d. Wood e. Green technologies f. Masonry (brick)
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Gaseous combustion products with the molar analysis of 15% CO2, 25% H2O, 60% N2 enter an engines exhaust pipe at 11008F, 1 atm and are cooled as they pass through the pipe, to 1258F, 1 atm. Determine the heat transfer at steady state, in Btu per lb of entering mixture.
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