Engineering (Science & Mathematics) - January 2007

A certain paint mixture of mass 135 kg contains 20% solids suspended in water. How many kilograms of water must be allowed to evaporate in order to raise the concentration of solids to 25%?

2007-01-10 23:11:42 · 1 answers · asked by edison c d 4

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Will a 50Hz Meter give false readings for currrent, voltage and watts on a 60Hz supply?

I have a UK combination meter to measure Voltage, Current and Wattage. It is 230V 50Hz appliance used to test household appliances. I'm using it to test Computer equipment power usage.

I need to measure the three metrics on a 230V 60Hz supply. I want to know if the meter will return an inaccurate reading for any of these. I think the Voltage will be fine but not so sure about the current!
Thanks

2007-01-10 23:10:56 · 3 answers · asked by jmac01 1

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what is a simple way to detect EMI?

2007-01-10 23:09:49 · 1 answers · asked by majell d 1

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Bluetooth Technology!?

Hi friends! I need info about this for my paper presentation work. Please help me with valid points and latest striking facts or related news about this.

2007-01-10 22:41:50 · 4 answers · asked by Anonymous

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Using a 4-20mA (or 0-20mA) generator, is there a way to generate a 0-10VDC signal?

I have a multimeter that can generate a 4-20mA signal. There is supposed to be a way to make 0-10VDC attaching a resistor somehow, but not sure.

2007-01-10 22:17:44 · 1 answers · asked by Mesax 3

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Why dont overhead power cables have rubber/plastic cover so that if they fall they cant cause serious injury?

There have been severe storms in my country Kenya and power lines have fallen and caused a lot of injuries, some fatal to pedestrians, motorists and others.I am sure if power lines were covered with rubber sheathing or some other apopropriatde material, there would be less likelihood of electrocution, serious injury, fire or property damage. I am a lay person in these matters so I am talking from what I have seen.Thanks in advance.

2007-01-10 21:42:59 · 4 answers · asked by tweety 1

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what do the coin sensors on fruit machines or any other coin operated devices actually read about the coin to?

determine whether its genuine or not.

2007-01-10 21:23:27 · 9 answers · asked by Anonymous

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Can KT after placement affect it?

2007-01-10 20:59:05 · 1 answers · asked by archie 1

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which engineering line does it deals with study of electromagnetic spectrum(radiowaves,microwaves,uv rays)?

2007-01-10 20:58:38 · 4 answers · asked by ridleyjopling 5

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CAN ANYONE ALSO SUGGEST A NICE THESIS FOR ME!! its for civil engineering pls!! THANK YOU?

2007-01-10 20:49:34 · 4 answers · asked by marzdoree 1

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explain about electrical conductivity?

details about it

2007-01-10 19:21:45 · 2 answers · asked by Anonymous

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What are steam tunnels for?

2007-01-10 18:38:56 · 3 answers · asked by HMX 1

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what is voltage drop in a circuit?

2007-01-10 17:50:55 · 2 answers · asked by Princess Jasmine 2

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what percent of grade is the steepest paved road?

2007-01-10 17:37:44 · 6 answers · asked by c411 1

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if glass is a fluid, can it flow??

i recently bought a VERY old house and one of the windows has a patch where it looks melted. i know glass is a fluid because of its structure. But is it possible that it was weaker in this area and flowed over a long period of time or was it just made that way?

2007-01-10 17:24:05 · 12 answers · asked by Anonymous

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In electronics , how come that i cannot see any negative Amperes(current) in any specs.?

2007-01-10 15:59:32 · 4 answers · asked by guro 4

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what are possible solutions on how to make a paper tower using only two sheets of 8.5x11 inch paper.?

2007-01-10 15:30:54 · 3 answers · asked by spyster2777 1

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What is the meaning/definition of 0 dBV?

2007-01-10 14:44:30 · 3 answers · asked by Anonymous

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What are ways you can drop and egg and have it not break?

It can have a parachute not bigger than a foot (no limit on string length), the protective area around the egg can stick out no more than one inch, and it cannot be boiled.

2007-01-10 14:23:37 · 13 answers · asked by Anonymous

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If g(x)=b, where b is a positive constant, describe how the graphs of y=(h)(x) and y=(h-g)(x) will differ.?

2007-01-10 13:57:39 · 1 answers · asked by nadia 2

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If I need to lower the Rotation speed of a DC motor, but can't change the voltage what is the eaisest way?

I am trying to help my brother with a project for school, he has a disco ball like object hooked up to a DC motor. The motor is spinning it, but it spinning it to fast. It has to be run from a 1.5v D battery, so I can't lower the ammount of voltage at the source. what components could I use to slow the motor down? Also we can't use a different motor.

P.S. I'm good with electronics components so I have no problem using resistors etc...

2007-01-10 13:43:27 · 11 answers · asked by Anonymous

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