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1) a) I placed several aluminum pie plates on top of the large metal sphere of the van de Graaff machine and then turned it on. After a few seconds the pie plates flew off. Explain why. Focus on physics involved.
b) When I placed packing peanuts in a pie plate they also flew off. Why? Can this be explained by the same physical mechanism as question a)? Explain.
c) A second smaller metal sphere was positioned nearby the van de Graaff machine. This sphere was grounded. Did this small sphere become charged? How and why? What was the interaction between the two spheres (attractive or repulsive)? Explain.
An 8-pole, 3-phase alternator is coupled to a prime mover running at 750 r.p.m. It supplies an induction motor, which has a full load speed of 950 r.p.m. Find the number of poles.
Design the datapath that will add the value in register A to the value in any of the registers R0 through R3 and store the result back into any of the registers R0 through R3. The inputs to the datapath should be two-bit control signals src and de..
A PCM-TDM system multiplexes 32 voice band channels each with a bandwidth of 0-4kHz. Each sample is encoded with an 8-bit PCM code. UPNRZ encoding is used.
Assessment on Electricity and Circuit Theory, What part of a cable are insulators and conductors? Describe, in terms of charged particles, why some objects are electrically attracted to each other, while others repel each other?
What is the maximum value of voltage that is considered a valid logic 0 at bit D0 of the 8088's data bus Assume that the output is sinking 2mA
Given: Si is doped with boron atoms; concentration of boron atoms is 1014 cm-3. Find: carrier concentration in Si at T = 300 K. (Hint: use Principle of Space Charge Neutrality) Find: Ei - position of Fermi level in intrinsic Si at T..
A telecommunication system has a link bandwidth of 10 MHZ, signal propagation of 3.5 x 10^8 m/s, transmitting as 1500 frames per minute, with 15000 bits per frame, over a distance of 100 km. What is the bandwidth-delay product?
A germanium wafer is doped with phosphurus Nd=10^15 cm^-3. Find the electrons and holes densities and the Fermi level at room temperature.
Describe how an ideal inductor reacts to steady state DC and why. State the equation for finding the instanteneous current in an inductor during the transient period. Explain each part
A 3-phase squirrel cage motor has maximum torque equal to twicefull load torque. r2 =0.3 ohms and x2 =3ohms. Determine the ratio of starting torque to full loadtorque, if it is started by (a) Direct on line starter(b) star delta starter
A computer has 16-bit instructions and 64 registers. Suppose it is required to have at least 14 instructions designed to have 2 operands from registers (e.g., add, $1, $3 puts the sum of $1 and $3 into $1.
in december 2007 what at the time was the largest in north america a solar voltaic power plant was activated at nellis
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