Ultimate Engineering Study Guide - Questions & Answers

Air enters a converging nozzle/diverging nozzle at a Mach number of 0.2. The inlet cross sectional area is 6 cm^2. Air flows isentropically through the duct. Assuming choked flow at the throat, what is the cross sectional area of the throat, in cm^2?
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16. Which of the following is the BEST indicator of the actual amount of water vapor in the air? a. Air temperature b. Saturation vapor pressure c. Relative humidity d. Dew point temperature e. Mixing ratio
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A horizontal curve on a two-lane highway (12-ft lanes) has PC at station 123 80 and PT at station 129 + 00. The central angle is 35 degrees, the superelevation is 0.08 and 20.6 feet is cleared (for sight distance) from the inside edge of the innermost lane. Required:Determine a maximum safe speed (assuming current design standards to the nearest 5 mi/hr.
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Calculate the maximum torsional shear stress that would develop in a solid circular shaft, having a diameter of 1.25 in, if it is transmitting 125 hp while rotating at 525 rpm. (5 pts)
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What is the total rated capacity (MW) for this wind farm if it has 22 industrial-scale wind turbines each with a rated power-generation capacity of 3.45 MW
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Water is the working fluid in a Rankine cycle. Superheated vapor enters the turbine at 10 MPa, 480 C, and the condenser pressure is 6 kPa. The turbine and pump have isentropic efficiencies of 80 and 70%, respectively. Determine for the cycle (a) the heat transfer to the working fluid passing through the steam generator, in kJ per kg of steam flowing.
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Transformer open circuit (OC) and short circuit (SC) tests allow us to calculate certain equivalent circuit values. Which parameters are calculated from the OC test and which are from the SC test?
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An air conditioner removes heat steadily from a house at a rate of 850 kJ/min while drawing electric power at a rate of 10 kW. Determine: (a) the COP of this air conditioner. (b) the rate of heat transfer (kJ/min) to the outside air.
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In order to create an interior space, an architect must design a distance between two supports called ________.
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Which architect helped the city of Chicago rebuild after the fire and is known for using the idea that a building's function should influence its design
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a. Find and list 3 references regarding a synchronous machine. Then, in your own words, state the operation of a 3 phase synchronous machine. b. Compare and contrast the behaviors of synchronous and asynchronous machines. Specifically mention how torque is obtained from the stator
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Technician A says that a voltage drop test of the charging circuit should only be performed when current is flowing through the circuit. Technician B says to connect the leads of a voltmeter to the positive and negative terminals of the battery to measure the voltage drop of the charging system. Who is right
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Mass transit options are generally more accessible to occupants of a building in an urban setting, and green roofs mitigate stormwater and reduce heat island effect of buildings. Which LEED rating system category addresses mass transit, stormwater mitigation, and hear islands?
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Sedimentation tanks in a rapid sand filtration plant must be designed to achieve a minimum hydraulic residence time of 3 hours and a maximum hydraulic loading rate of 750 gal day-1 ft-2. For a water production rate of 500,000 gallons per day, determine the dimensions of the sedimentation tanks. There should be a minimum of two tanks in parallel for reliability. Use a rectangular tank configuration with a width equal to approximately one tenth of the length.
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Technician A says that all battery connections should be inspected for corrosion. Technician B says that battery cables should be checked for corrosion and replaced as needed. Who is right
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_______________ is a term applied to the horizontal direction that air takes in relationship to the downward flow of water in a cooling tower.
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echnician A says that electronic conductance testing can determine CCA, state-of-charge, and voltage of the battery. Technician B says that electronic conductance testing can determine if there is a bad cell, requiring battery replacement. Who is right
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A stream of refrigerant-134a at 1 MPa and 20 C is mixed with another stream at 1 MPa and 80 C. If the mass flow rate of the cold stream is 10 kg/min and the hot stream is 11 kg/min, determine the temperature and the quality of the exit stream. You only need to report the quality here in the quiz, but be sure to identify the temperature in your supporting calculations. Report the quality to two decimal digits, for example 0.32, or 0.86.
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Water flows in a trapezoidal channel where the bottom width is 6 m and has side slopes of 2:1 (H:V). The channel lining has an estimated Manning n of 0.045 m, and the slope of the channel is 1.5%. When the flowrate is 80 m3/s, the depth of flow at a gaging station is 5 m. Classify the water-surface profile, state whether the depth increases or decreases in the downstream direction, and calculate the slope of the water surface at the gaging station.
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A highway reconstruction project is being undertaken to reduce crash rates. the reconstruction project involves a major realignment of the highway such that a 60mi/h design speed is attained. at one point on the highway, a 720 ft equal-tangent crest vertical curve exists. measurements show that at 3+40 stations from the PVC, the vertical curve offset is 3.5 ft. assess the adequacy of this existing curve in light of the reconstruction design speed of 60 mi/h and if the existing curve is inadequate,compute a satisfactory curve length.
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An analog signal with a bandwidth of 36MHz is sampled at a frequency (fs) of 72,000,000 samples per second during the ADC (analog-to-digital conversion) process. What is the outcome of the received signal after the DAC (digital-to-analog conversion) process
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A 150-mm-dimaeter and 0.5-mm-thick silicon wafer needs to be cooled uniformly and rapidly from 100oC to 30oC during the manufacturing process. The cooling is achieved by blowing 25oC nitrogen gas on both sides of the wafer. What is the maximum convective heat transfer coefficient that can be used without causing non-negligible temperature non-uniformity across the thickness of the silicon wafer during the cooling process
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A semi-circular viewing window is located in the side wall of a tank of water. The bottom of the window is 2 m below the surface. The radius, r, of the window is 0.5 m. Calculate the total resultant force.
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Technician A says that an electronic suspension can use a driver input such as soft, normal, hard. Technician B says that most electronically controlled suspension systems use a separate electronic control module. Which technician is correct
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