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Compare and contrast the principles of operation of a dc tachometer and an ac tachometer (both permanent-magnet and induction types). What are the advantages and disadvantages of these two types of tachometers?
The volume flow Q varies with gravity g, weir width b into the paper, and upstream water height H above the weir crest. If it is known that Q is proportional to b, use the pi theorem to find a unique functional relationship Q(g, b, H )
In an experiment, the temperature of a hot gas stream is to be measured by a thermocouple with a spherical junction. Due to the nature of this experiment, the response time of the thermocouple to register 99% of the initial temperature difference ..
Two cargo trains each leave their respective stations at 1:00 p.m. and approach each other, one traveling west at 10 miles per hour and the other on separate tracks traveling east at 15 miles per hour. The stations are 100 miles apart. Find the time ..
Three kg of gas in a piston–cylinder assembly undergo a process during which the relationship between pressure and specific volume is py 0.5 5 constant. The process begins with p 1 5 250 kPa and V 1 5 1.5 m 3 and ends with p 2 5 100 kPa. Determine th..
An air conditioner maintains the temperature of a dwelling at 72 degrees Fahrenheit when it is 96 degrees Fahrenheit outside. If heat is transferred through the walls and ceiling at 35,000 BTU/hr. a) What is the minimum power required to run the Air..
a reverse osmosis unit for purifying dilute salt solution has 900000 hollow fibers that permit water and reject salt.
consider a wind turbine with a 90-m blade span subjected to 25-kmh steady winds. if the combined turbine-generator
a gas is contained in a vertical fractionless- cylinder device. the piston has a mass of 4 kg and cross sectional area
a construction crew lifts about 560 lb of material serveral times during the day from a flatbed truck to a 32 foot
Water as a saturated vapor at a temperature of 300 °C undergoes the path of a linear change in of pressure with respect to volume until the final pressure is 6500 kPa and the final temperature is 600 °C. Show the process on a P-v diagram. Find the ..
Due to global climate change scientist predict the earth’s atmospheric temperature will increase as much as 8°F in the next 100 years. Estimate the overall energy increase [kJ] in the atmosphere this temperature rise will cause. Consider the thicknes..
A fluid is flowing in a pipe, the pressure drop is 12 psi per 1000 ft. We now double the flow rate, keeping other parameters constant. What is the pressure drop if the new Reynolds’ number is a) 10 and b) 108?
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