Engineering, 22.03.2021 21:30 pinkpearl2022

Two identical 4 in. major-diameter power screws (single-thread) with modified square threads are used to raise and lower an 70 ton sluice gate on a dam. Quality of construction and maintenance (including lubrication) are good, resulting in an estimated friction coefficient of only 0.1 for the screws. The thrust collars for the power screws have a mean diameter of 5.50 in and an effective friction coefficient of 0.24. Assuming that, because of gate friction, each screw must provide a lifting force of 36.4 tons, what power is required to drive each screw when the gate is being raised at the rate of 3 ft/min

Answers: 2

Show answers

Other questions on the subject: Engineering

Engineering, 04.07.2019 12:10, Ryantimes2

On a average work day more than work place firs are reorted

Answers: 1

continue

Engineering, 04.07.2019 19:10, ndaha

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?

Answers: 2

continue

Engineering, 04.07.2019 19:10, thawkins79

Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj

Answers: 2

continue

Engineering, 04.07.2019 19:20, natalie2sheffield

Acompressor compresses a gas, a pump compresses a liquid. for a given pressure ratio, why does it take more work to compress a gas in a compressor than a liquid in a pump? a)- for a given pressure ratio the average specific volume for a gas is much higher than the average specific volume for a liquid. b)- there is no difference. the only difference is the amount of heat generated (not work) c)- for a given pressure ratio the average volurge for a gas is much higher than the average volume for a liquid. d)-there is no difference

Answers: 3

continue

You know the right answer?

Two identical 4 in. major-diameter power screws (single-thread) with modified square threads are use...