# All Questions

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### How much do I need to trickle my faucet in cold weather (as a function of x,y,z)?

I am told that, in cold weather, I should let my faucet trickle a little to prevent pipes from freezing, especially if some portion of my above-ground pipes are likely to get cold. Are there any rules ...
0answers
4 views

### How do I reduce the mains spike in a switched mode PSU?

I have a switched-mode PSU for a gaming laptop. It has a bad habit of burning out the switches on mains extension panels when I turn it on (two in the last four days). The turn-on surge is always ...
0answers
8 views

### Increase in internal energy and temperature

A banquet hall (150 m3) is to be used for a formal dinner for 20 persons. Each person occupies 0.075 m3 of space and has an average heat transfer rate of 500 kJ/hr. If the AC system fails, determine ...
1answer
12 views

### Why is the thin-walled cylinder more likely to experience failure along its axis than along its hoop/circumference?

I was watching the YouTube video: https://www.youtube.com/watch?reload=9&v=Ja03J1RQ3Hw to understand the concepts of hoop/circumferential stress and axial/longitudinal stress in thin-walled ...
0answers
15 views

### On servo loops bandwidth and tracking

Referring to article https://www.controldesign.com/articles/2018/servo-terminology-makes-a-difference/ I was unable to understand how loop gain influences the noise rejection and tracking. Taking ...
0answers
10 views

### Best PID autotuning algorithm/library for simple heater problem

It's the 21st century, anything is possible. Except for PID autotuning for a simple problem, heating/cooling system - make robust and ready to use solution. I've found only one library for PID ...
0answers
9 views

### How do I model the ELEGOO robot car?

This is the robot car in question. The car is made up of the following sub-systems: DC motor driver subsystem, where the input is the PWM signal from a microcontroller (for example), and the output ...
1answer
20 views

### Drum-brake self-adjusters

I was reading about Automotive Brakes (Chapter 52, Automotive Mechanics by William H Crouse, Donald L Anglin, 10th edition). And in a section about drum-brake self-adjusters, it is said that the ...
0answers
15 views

### How can the spinning arms of a dishwasher be leakproof?

Recently I was wondering, how it is possible, that the spinning arms of i.e. a dishwasher or a high pressure cleaner can form a leakproof connection from the fixed watersupply to the nozzle on the ...
2answers
41 views

### Why aircraft refrigeration uses a centrifugal compressor in place of reciprocating compressor?

Why aircraft refrigeration uses a centrifugal compressor in place of reciprocating compressor and a gas turbine in place of reciprocating expander?
0answers
26 views

### Vertical Distance Measurement Sensor between Railway Bogie and Track

Need to find a Displacement Sensor with following details: I need to place a displacement sensor that continuously measures vertical gap between a railway carriage and the track. That is, a beam is ...
0answers
59 views

### What is the amount of force that will cause failure?

What is the amount of force required to cause the beam to deflect, shear or otherwise fail? The force would be generated by a hydraulic piston. Let's call those units PSI. The piston will be mounted ...
1answer
26 views

### What is the difference between requirements and design specifications?

Working while employed at large companies, I was at times confused as to what was considered to be a requirement and how a specification differs from it. Upon reading more about it, I have discovered ...
0answers
18 views

### Is it allowed to have conflicting design requirements? [closed]

Is it ok to have conflicting design requirements?
0answers
9 views

1answer
34 views

### Maximum hole size in brickwork before a lintel is required

Holes are made in brickwork walls for all kinds of reasons including gas flues, to route cabling and to fit windows. At some point that hole gets large enough that a lintel is required to support the ...
1answer
37 views

### Bending stiffness of composite shaft

What is the method to compute the effective bending stiffness "EI" of a composite structure, in this case a shaft (as seen below). The shaft is hollow with outer radius $r_{o}$, inner radius ...
2answers
45 views

### Probability of structural failure

In structural engineering we have to accept the fact that you can never be exactly sure how much load a structural member can resist, that the load carrying capability of an element is not one exact ...
1answer
28 views

### Determine the bandwidth of a closed loop system [closed]

The unity feedback system with loop transfer function is given as $G_c(s)G(s) = \dfrac{50}{s(s+40)}$. Determine the bandwidth of the closed loop system. options 6.4 rad/sec 3.2 rad/sec 12.8 rad/sec 1....
0answers
5 views

### Heat-generating surface not exactly overlapping with TEC cold plate - loss estimate

I have to cool an optical element (drawn as the black rectangle in the figure shown below) using a TEC, with the cold plate drawn in gray in the figure below, including screw holes). 95 percent of the ...
0answers
21 views

### Roll Forming Process

The roller for our application is in contact with the aluminium extrusion as shown in figure 1, highlighted by the black box. Considering the in-homogeneous deformation, when there is no friction ...
0answers
26 views

### How do I combine multiple asynchronous motors? [closed]

Im not an engineer or even studying so thanks for the help and understanding. If I have a lot of motors all with different power & rpm how do I combine the power of all of it and drive a motor ( ...
0answers
33 views

### what is the name of this wheel found in toys which rotates freely?

I have tried doing search by image on few popular Internet search engines but could not get it. (sorry, it picked up lot of dust and a bit ugly to see). I want to know the name of such wheel and where ...
1answer
16 views

### Stress Concentration: Hole in infinite thin plate loaded in biaxial tension vs biaxial compression

Is there a difference in the stress concentration of a hole in an infinite thin plate loaded in biaxial tension vs biaxial compression? I ask because in numerous books (one of them in the screenshot ...
0answers
18 views

### Are there any manufacturers of thin sheets of ferromagnetic materials?

Are there any manufacturers of thin sheets of ferromagnetic materials? The sheets only need to be up to around 60 mm * 200 mm, and field strength up to around 3mT. This is to build a transducer, so as ...
0answers
13 views

### How to trace a square with a reuleaux triangle

I am trying to trace a square (with rounded corners) using a reuleaux triangle and a single (circular rotation) motor. I've seen many animations (example) of this but do not understand how to make it. ...
0answers
16 views

### Calculating kWh two-phase alternating network 3 wires

I want to do a project to measure electrical consumption but I have the following question: How to calculate kWh consumed in a 3-wire biphasic network? Example: I have the following chains on the ...

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