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Seeing a grayscale detailed image of an insect, what is main feature that allows recognition of electron vs. optical microscopy? Comparing emitted Auger electrons (AES, Auger electron spectroscopy) with X-rays (EDX / EDS, energy-dispersive X-ray spectroscopy), what is the difference in the analysed sample volume (i.e. volume of the sample from which the signal comes)?
If this alternator is to generate 60-Hz voltages, find the new synchronous speed, and calculate the new terminal voltage for the same field current.
Nitrobenzene is fed to the reactor as a vapor, with three times the stoichiometric quantity of hydrogen. The conversion of the nitrobenzene, to all products, is 96%, and the selectivity for aniline is 95%.
A three-phase, wye-connected, 2300-V, four pole, 1000-kVA, 60-Hz synchronous machine has a synchronous reactance Xs = 5 Ω, a field resistance Rf = 10 Ω, and an approximately linear magnetization characteristic (Ef versus If ) with a slope Kag = 200 Ω..
The molar specific heat of many materials at low temperatures is found to obey the Debye law C_v = A[T/theta]^3 where A is a constant equal to 1.94 x 10^3 Jmol^-1K^-1 and with the Debye temperature theta taking different values for different mater..
The diameter of the impeller is 3 m and the impeller is installed 1,35 m abobe the bottom of the 2o ft tank. If the temperature is 30 C and the impeller is rotated at 30 r/min, what will be the power consumption ? Find the Reynolds number.
What is the minimum pressure that we must have at the exit of the compressor in order to achieve liquefaction?
On the basis of the general solubility rules given in Table 4.1, predict which of the following substances are likely to be soluble in water.
For the numerical values I = 10 A,N = 500 turns, g = 5 mm, a = 20 mm, b = 2 mm, and l = 40 mm, find the magnitude of the force. Assume infinite permeability of the core and neglect leakage.
Nitrogen is compressed adiabatically in a closed system from initial pressure P1 = 1 bar, T1 = 5 °C to P2 = 5 bar. Due to irreversibilities there is an entropy generation equal to 4.5 J/mol K. Calculate the temperature at the end of the comp..
A single-phase, two-winding, 10-kVA, 440:110- V, 60-Hz transformer is to be connected as an autotransformer to supply a load at 550 V from a 440-V supply.
The precooler uses cold vapor from the separator as the cooling medium; this vapor leaves the precooler at 20 °C (stream). Perform the energy and entropy balances on the basis of 1 kg/s of liquid nitrogen produced.
If the generated emfs are 200 and 210 V, respectively, determine the load voltage and the armature current of each machine.
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