Ultimate Engineering Study Guide - Questions & Answers

______________________________ provides a waterproof surface to enhance corrosion resistance of reinforcing bars. A. Welded wire B. Epoxy coating C. Stainless steel D. Zinc coating
1 Answer
A(n) __________ drain is a waste pipe that does not connect directly to the drainage system but discharges into a floor drain or floor sink directly connected to the drainage system.
1 Answer
For industrial machinery, straight exposed vertical risers of intermediate metal conduit with threaded couplings are permitted if supported at the top and bottom no more than ___ feet apart.
1 Answer
A wing model is tested in a subsonic wind tunnel at standard sea-level conditions with a velocity of 100 m/s. The wing area and chord are 1.5 m2 and 0.45 m respectively. The moment about the c. g. when the lift is zero is found to be -12.4 N. m. When the model is pitched to another AOA, the lift and moment about the c. g. are measured to be 3675 N and 20.67 N. m., respectively. Calculate the value of the moment coefficient about the aerodynamic center (acmC) and the location of the aerodynamic center with respect to c. g..
1 Answer
Technician A says crankshafts in high performance engines are generally cast iron. Technician B says crankshafts in high performance engines may be forged iron. Who is correct
1 Answer
For some metal alloy, a true stress of 345 MPa (50040 psi) produces a plastic true strain of 0.02. How much will a specimen of this material elongate when a true stress of 418 MPa (60630 psi) is applied if the original length is 500 mm (19.69 in.)
1 Answer
Pier and post foundations with beams or girders must have at least a ____ inch bearing on the foundation.
1 Answer
) A 0.3m-wide panel is made of a metal sheet with toughness (KIC) 50 MPa.m1/2 and yield strength 420 MPa. Calculate the maximum permissible crack size in a single-edge-cracked panel subjected to a uniform tensile stress of 140 MPa (i.e., Single-edge notched tension specimen). (b) Does the situation satisfy the small scale yielding condition
1 Answer
A concrete pipe main for a large neighborhood of a major US city provides potable water to about a million people. a) Compute the volume flow rate (discharge) of water transported in the pipe when the head loss between points separated by L=3350 m is 6 m. The pipe has a diameter D=2.3 m and a roughness height of 5 mm. You may use either the Direct Solution or the Iterative Solution. In the latter case, use the Moody chart provided with these pages. Which regime is the flow in? b) Compute Manning's n, Chezy C and Darcy-Weisbach's f. c) Calculate also the input power to the pump requi
1 Answer
A four-lane highway (two lanes in each direction) has a northbound capacity of 1000 veh/hr/lane. There are 1334 vehicles per hour going in the northbound direction. An incident on the highway closes both northbound lanes (i.e., flow is 0 veh/hr) for 10 minutes. After these 10 minutes, one lane of the northbound direction is then cleared and operates at full single-lane capacity for another 20 minutes, after which, the second lane is reopened and full two-lane capacity is restored. Assuming D/D/1 queuing, determine the following:a. time until queue dissipation (after the start of the incident)b. total vehicle delayc. average delay per vehicled. longest queue lengthe. longest delay of any vehicle (assuming FIFO)f. graph of this queuing situation
1 Answer
A continuous voltage signal is to be converted into its digital counterpart using an analog digital- converter (ADC). The maximum voltage range is /-115V. Calculate the minimum number of bits required to reach a resolution of:
1 Answer
Determine the cycle time for a single-engine scraper rated at 21 cy heaped that is used to haul material from a pit to a fill 900 ft away under severe conditions. The average haul speed will be 14 mph and the average return speed will be 20 mph. Assume, at an average speed of 5 mph, that 200 ft is required both to accelerate and decelerate. The operating efficiency will be equal to a 50-min hour. It will take 0.80 min to load this scraper.
1 Answer
Technician A says torsion bars are used in pickup trucks and SUVs because they can be mounted low. Technician B says one end of the bar is attached to the vehicle frame, and the other end is attached to the steering knuckle. Who is correct
1 Answer
determine the shear stress at the wall surface, if the fluid is air at 1 atm and at a temperature of 20
1 Answer
When making an airborne VOR check, what is the maximum allowable tolerance between the two indicators of a dual VOR system (units independent of each other except the antenna)
1 Answer
2. Determine the mass of air in a 2 cubic meter tank if the air is at room temperature, 20 degrees C, and the absolute pressure within the tank is 200 kPa (abs).
1 Answer
A combined cycle power plant has a net power output of 214 MW. Air enters the compressor of the Brayton cycle at 100 kPa and 37oC. The pressure ratio is 18, the turbine inlet temperature is 1620 K and the gases leaving the turbine are used to heat the steam of the Rankine cycle to 600oC and 6 MPa. The combustion gas leaves the heat exchanger (HRSG) at 420 K and the condenser pressure is 10 kPa. The isentropic efficiency of the compressor is 91%, the gas turbine isentropic efficiency is 93%, the steam turbine isentropic efficiency is 92% and the pump efficiency is 65%. The condenser sub-cools the water by 10oC (10oC less than the saturation temperature). Using variable specific heat analysis, determine: a. Rate of heat input in the combustion chamber, Qin in kW. b. Rate of heat transfer in the HRSG, in kW. c. Power input to the pump, in kW. d. Power input to the compressor, in kW. e. Net power output from the Brayton cycle, in kW. f. Net power output from the Rankine cycle, in kW. g. Overall efficiency.
1 Answer
A turbojet engine is in an airplane flying at 430 km/h . The mass flow rate of air entering the compressor is 13.5 kg/s and the mass flow rate of fuel is 0.13 kg/s. The effective velocity of the air entering the inlet is equal to the airplane's velocity, and the exhaust velocity (relative to the airplane) is 530 m/s . What is the thrust of the engine
1 Answer
Within the last month, the raw material price and consumable price combined has increased by 5.5%. If the throughput was 5 parts/hour, estimate the future throughput that has to take place in order to maintain a constant production cost. Consider the yield of this production is 90%. It is known that materials contained in each product weigh 2.5kg, materials (including consumables) cost is $100/kg, All equipment cost is $750,000 to be written off in 5 years with an average machine utilization of 45% over 24 hr/day, tooling cost is $200, the overhead rate (including labor) is $250/hr, energy cost is $25/hr, space and administration cost is $120/hr, and information (R&D, royalties, licenses) is $35/hr.
1 Answer
What is the difference between a local convection heat transfer coefficient and an average coefficient
1 Answer
The additive that allows a hydraulic fluid to flow more freely at low temperatures is known as a(n) ______ depressant.
1 Answer
Suppose that a wing component on an aircraft is fabricated from an aluminum alloy that has a plane strain fracture toughness of 27 MPa (24.57 ksi). It has been determined that fracture results at a stress of 108 MPa (15660 psi) when the maximum internal crack length is 9.4 mm (0.3701 in.). For this same component and alloy, compute the stress level at which fracture will occur for a critical internal crack length of 5.8 mm (0.2283 in.).
1 Answer
One benefit for using self-consolidating concrete is __________________________________. A. Lower plastic shrinkage cracking B. Reduced tensile creep C. Its ability to be placed in congested spaces D. A low viscosity achieved using high water contents and superplasticizers
1 Answer
It is desired that the impedance at resonance be one-fifth the impedance at 10 kHz . What value of R should be used to obtain this result
1 Answer