Question 102 - (a) As an approximation, let v = Zc / 137 where v is the radial velocity for 1 s electron of an element, c is the speed of light, Z is the atomic number. For gold with Z = 79, find the radial velocity of its 1 s electron, in term of c and percentage of the speed of light. (b) As an approximation, let A x A = 1 - Z x Z / 18769 where A is the ratio of the relativistic and non-relativistic Bohr radius. Find the value of A.
1 2172what is a speed of rotor when we give supply to stator of 50hz and as well as rotor of 60hz of an induction motor?????
1202A 400KVA Transformer has 400Hz frequency.if frequency is changed to 50Hz,then what will be the new KVA rating?
ABC,
2 2672THERMODYNAMIC - EXAMPLE 10.1 : The water is superheated steam at 440 degree Celsius and 17.32 megapascals. Estimate the enthalpy of the steam above. From the steam table for water at 440 degree Celsius, enthalpy of steam, h at 18 megapascals is 3103.7 kilojoules per kilogram and at 16 megapascal is 3062.8 kilojoules per kilogram. Assume that h = mP + c where P is pressure; m and c are constants at fixed temperature with small differences in P.
1 1571THERMODYNAMIC - EXAMPLE 10.2 : A cylinder with a movable piston contains 0.1 mole of a monoatomic ideal gas. The piston moves through state a, b and c. The heat Q, changes from state c to a is + 685 J. The work W, changes from state c to a is - 120 J. The work, W performed from state a to b then to c is 75 J. By using the first law of thermodynamic, U = Q + W where U is the internal energy : (a) Determine the change in internal energy between states a and c. (b) Is heat added or removed from the gas when the gas is taken along the path abc? (c) Calculate the heat added or removed when the gas is taken along the path abc?
1 1709THERMODYNAMIC - EXAMPLE 10.3 : According to Raoult's law, the pressure when vapor is completely condensed, P = x(1) P(1) + x(2) P(2) ... + x(n) P(n) when x(1), x(2) ... x(n) are the mole fractions of component 1, 2 ... n and P(1), P(2) ... P(n) are the vapor pressures of component 1, 2 ... n. A vapor at 74 degree Celsius containing 70 mole % water and 30 mole % ethanol is to be completely condensed. At the temperature of 74 degree Celsius vapor pressure is 0.38 atm for water and 0.97 atm for ethanol. What is the minimum pressure the compressor must be operated?
1 1503CHEMICAL ENERGY BALANCE - EXAMPLE 11.1 : Please match the term A - E with the stated definition i - v. Terms : A. Yield. B. Selectivity. C. Relative saturation. D. Molal saturation. E. Absolute saturation. Definitions : i. (moles of desired product formed) / (moles that would have been formed if there were no side reactions and the limiting reactant has reacted completely); ii. (moles of desired product formed) / (moles of undesired product formed); iii. (relative humidity 40 % means partial pressure of water vapour equals 4 / 10 of the vapour pressure of water at the system temperature); iv. (moles of vapour) / (moles of vapour dry gas); v. (mass of vapour) / (mass of dry gas).
1 1434how many sqft or cft of work done by a mason per day in all works such as brick,block,concrete,shuttering carpenter,reinforcement fabricator,painter,door window carpenter.....everything thank you
1467
Explain RAID and mirroring?
I AM APPERING FOR RRB EXAM FOR SECTION ENGINEER I REQUEST U TO PLZ FORWORD THE PAPER PATTERN AND EVEN PREVIOUS QUESTION PAPER to stamil230@gmail.com
Electrical Engineering
please send me latest Aptitude Test paper
What is the conductivity of perfect dielectric?
Jspl question paper for freshers requirements chemical engineering diploma
How to Know that veriation acceptable in CPWD Work Of 1:6 Cement Mortor Received Lab test report.
Why collector is always reverse-biased w.r.t base?
We will import machihery. how we will take input
Why in 6 KV XLPE cable termination kit used and why not in 380 V xlpe cable same is not used
Which is the largest hydropower station in the world?
Generator,motor and alternator Working principal Please explain easily
What is an instrumentation amplifier?
What is the purpose of increasing the pressure on the F.O. system of the engine?
How do you determine the size of transformer radiators in a transformer?