Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Explain why nichrome and not copper is used as heating element whereas manganin is used as standard resistance?
For heating elements, primary requirements are high melting point, high electrical resistance and low thermal expansion. Last two requirements help in reducing thermal fatique because of repeated heating and cooling. Heating elements must be designed in a way as to allow unhindered expansion and contractions for instance, in the form of a coil of wire. Nichrome (80% nickel & 20% chromium) has all above, mentioned requirements and can be used up to 1300°C. So, nichrome and not copper is used as heating element. Additionally melting point of copper is 1083°C, which is less than nichrome.
For resistor applications, primary requirements are uniform resistivity, small temperature coefficient of resistance, stable resistance and low thermo electric potential with respect to copper. A small α minimizes erron in measurement because of variations in ambient temperature. α is defined as α = 1/R= dR/dT where R is resistance of the alloy at temperature T. For Manganin alloy (87% copper and 13% manganese) α is only 20 x 10-6/K as against 4000x10-5/K for pure copper. Therefore manganin is used as standard resistance.
Explain ten methods of preparation of cycloalkanes from straight and branched alkanes
I put an unknown solid acid into a base solution. How do I find the equivalents of base consumed?
A solid substance with a mass of 200g is at its melting temperature in a calorimeter. While the substance changes from a solid to a liquid at the same temperature, the 400-gram mas
perkin ring closure reaction of melonic ester with C2H5O-Na+
The total number of electrons present in all the p-orbitals of bromine are: (1) Five (2) Eighteen (3) Seventeen (4) Thirty five Ans: Seve
Q. Show the applications in Bioinorganic chemistry? Bioinorganic chemistry or the study of the role of metal ions in biological cycles is mainly the study of some typical metal
what are the differences between positive and negative mesomeric effect
what are the chemical properties of p-block elements?
#sulphuric acid can be made with concentration of 99%.however for diferent industrial requirement ,62% h2so4 is used which has density of 1.55 g/ml.calculate the molarity,molality
pplications of radiotracers in analytical mathods
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd