Mechanical Engineering question and answers for July 21, 2023
- Q what safety precautions should be taken when using atorch inside or near a building
- Q While looking at the results of an oil pressure test: TechnicianAsays that higher than normal readings can be caused by using oilthat is too thin. Technician Bsays that higher than...
- Q Name and briefly describe at least two approaches toplanarization. Indicate which is evolving as the preferredapproach.
- Q A mixer operating at steady state has two inlets and oneoutlet.- At inlet 1, superheated water vapor at 2 bar and 200°C flowswith an average velocity of 1m/s- At inlet...
- Q What is the process for reversing a DC motor?
- Q What is a stepper motor and give some examples of where astepper motor may be utilized.
- Q Transformers are very efficient devices with efficiencies oftypical distribution and power transformers approaching 96 to ashigh as 99 percent. List three causes that can reduce transformerefficiencies
- Q Suppose a vertical pipe is to be used as part of a system tomanually cycle nutrients upward from the floor of a lake. (Manylakes do this naturally, some do not....
- Q a) Discuss the effect that crushing (out of roundness) causedby poor handling will have on the performance properties ofcasing.b) Explain the following Special Cementing Problems and howthese problems can be...
- Q Temperature has a relatively unusual effect on rubber. Assumethat the rubber band is governed mainly by entropic elasticity,what do you expect about a stretched rubber band when heated?Why?
- Q The percentage of hardwood concentration in raw pulp, the vatpressure, and the cooking time of the pulp are being investigatedfor their effects on the strength of paper. Three levels ofhardwood...
- Q List the differences between deformation by twinning anddeformation by slip in terms of (a) mechanism, (b)condition of occurrence and (c)consequences. Any reasonable answer is accepted.Limit your answer to 25 words...
- Q If a velocity profile of a boundary layer is u= a+by+cy^2,please calculate the value of a, b and c, using the boundaryconditions.Please show all steps. I am trying to understand...
- Q Can someone explain how the heated concrete snow melting systemworks? mainly I need the formula used to express how the heat ofthe concrete melts the snow. Thank you
- Q If the temperature inside a room is 25°C and the temperatureoutside is ?10°C:a. What is the maximum relative humidity that can beaccommodated inside the room before the window fogs over?...
- Q A steel shaft is to be manufactured either as a solidcircular bar or as a circular tube. The shaft is required totransmit a torque of 1200 N_m without exceeding an...
- Q A gaseous mixture consists of 75 percent methane and 25 percentethane by mass. 28,000 m3 of this mixture is trapped ina geological formation as natural gas at 150°C and 14...
- Q mechanical vibrationConsider a single cylinder engine such as the one shown herewhere r is the radius of crank (5.0 cm), l is the lengthof the connecting rod (16 cm), Mp...
- Q 8. A Piper Cherokee is flying at 4000 ft standard altitude at105 mph. The wing has a rectangular planform (shape) with a span of30 ft and a chord of 5.33...
- Q Consider a high-speed subsonic wind tunnel. The conditions inthe large-diameter section upstream of the test section are V = 228mph and T = 540°R. At the test section, the temperature...
- Q Assume that we wish to design a Mach 10 hypersonic wind tunnelusing air as the test medium. We want the static pressure andtemperature in the test stream to be that...
- Q On October 3, 1967, test pilot William “Pete†Knight flew theX-15 hypersonic research vehicle to a world’s speed record for anairplane; he achieved Mach 6.7 at an altitude of 102,100...
- Q Water vapor enters a turbine operating at steady state at 480°C,90 bar, with a velocity of 247 m/s, and expands adiabatically tothe exit, where it is saturated vapor at 12...
- Q 14. Sacrificial anodes are bolted inside the_____ of a heatexchanger15. Sacrificial anodes minimize______ within a heatexchanger17. The two factors that determine the choice of toolsand equipment for a specific heat...
- Q Describe direct, first, second, and third order controlsystem.
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