• Size of DC circuit breaker increases as the voltage level increases. •AC arcs current reduces to zero in each cycle (2 times) If the circuit breaker contacts are opened at time when the current passed through zero and dielectric strength of the medium is build up rapidly so that arc cannot strike again then arc can be extinguished successfully. AC RMS and DC current equal to the average, there is no need to use any restructuring. However, the large current size, to the current transformer secondary current heat who can not be used due to transformer can not be used on DC circuits. Release long delay if the overload is the use of electromagnetic type (hydraulic type, that is, oil cup), then the delayed release characteristics to change, the minimum operating -140% bigger, so current to 110% the whole

• Size of DC circuit breaker increases as the voltage level increases. •AC arcs current reduces to zero in each cycle (2 times) If the circuit breaker contacts are opened at time when the current passed through zero and dielectric strength of the medium is build up rapidly so that arc cannot strike again then arc can be extinguished successfully. AC RMS and DC current equal to the average, there is no need to use any restructuring. However, the large current size, to the current transformer secondary current heat who can not be used due to transformer can not be used on DC circuits. Release long delay if the overload is the use of electromagnetic type (hydraulic type, that is, oil cup), then the delayed release characteristics to change, the minimum operating -140% bigger, so current to 110% the whole

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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A materials engineer wants to study the effects of two different processes for sintering copper (aprocess by which copper powder coalesces into a solid but porous copper) on two different typesof copper powders. From each type of copper powder, she randomly selects two samples andthen randomly assigns one of the two sintering processes to each sample by the flip of a coin.The response of interest measured is the porosity of the resulting copper. Explain what type ofstudy this is and why.
The level of a tank located on the roof of a building is measured if it is below a minimum level, water begins to be pumped from a cistern located in the basement of said building, as long as the tank contains water above a minimum level. In case the latter does not occur, the liquid must be taken from the urban supply network. The two bombs with which account, they must alternate their operation in order to reduce their wear (one cycle one, one cycle the other). The rooftop tank fills to a higher level. In addition, there must be a button to enable system operation and an emergency stop. You must indicate: (stairs diagram) a) Description of the problem solution b) Make a descriptive diagram of the solution c) Make the ladder diagram and explain its operation
Coding problems: HW5_2 A thin square metal plate has uniform temperature of E1 4T, = E, + E2 + T, + T6 degrees on two opposite edges, a temperature of E2 on one edge, 4T, = E, + T1 + T3 + T5 and E3 on the final edge. Equations can be written for the 4T3 = E1 + E3 +T2+ T4 temperatures, Ti, at 6 uniformly spaced interior nodes. Solve for the 4T4 = E1 + E3 + T3 + T5 node temperatures when E1=80, E2=120 and E3=60. 4T5 = E1 + T2 + T4 + T6 Present the results in a complete sentence using fprintf 4T, = E1 + E2 + T, + T5
1) The stress intensity factor K at a crack is given by K = Co na where o is the far-field stress, a is the crack length, and C is a parameter that depends on the geometry of the specimen and crack. For the case of the edge crack shown in the figure, C is given by: 0.857+0.265 9, 0.266(1-) + (1-9" C = %3D 3/2 Write a script file that will print out a table of values with the ratio a/b in the first column and the corresponding parameter C in the second column. let a/b range between O and 0.95 with increments of 0.05.
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thermostat, which will turn the heat on when the room temperature drops h degrees below its set point, Ts, and cuts heat off at a temperature h degrees higher than Ts . The system heats at a constant rate Q (thermal units per time unit), and the volume of the room is V, so, if the room were perfectly insulated, the heating system would raise the temperature of the room at the rate KVQ (degrees per time unit), where K is a constant of proportionality giving the change in temperature per thermal unit per unit volume. However, there is a heat loss to the outside that is proportional to the difference in temperature between the room and the outside. Using the modified Euler method, write a FORTRAN program to simulate this system, if the room temperature at time is T(t), T(0) = To, and the outside temperature, Tout' is given by: Case (1) : Tout is constant < Ts Case (2) : Tout = A sin(wt + 4)| , %3D reflecting daily cycles. A is temperature range, 2n/w is the period of a cycle, and o is the…
QI/ using System vesource- allo Gation graph with given Parameters number of Processes = 4 (R,Pı, P3, Py) num ber of Resoures number of instance for each resource i 2 : 5 ( R, R2, R3, Ry, Rs) %3D Build two Scenarios one with a deadlock and another with a cycle but no dead lock
7. Consider the air-conditioning requirements for a large home. The interior of the house is warmed by waste heat from lighting and electrical appliances, by heat leaking in from the outdoors, and by heat generated by the people in the home. An air-conditioner must be able to remove all this thermal energy in order to keep the inside temperature form rising. Suppose that each lightbulb generates 100 J/s and appliances emit 500 J/s each. Suppose also that heat leaks in from the outside at a rate of 3000 J/s. 1. Write a MATLAB code using the above measurements to determine the total amount of heat generated in J/s based of a large house with 20 lightbulbs and 4 appliances with heat leaking in from the outside. 2. One particular air conditioning unit can cool down a house with heat values generated at 2000 J/s or less. Write a MATLAB code to determine how many of these air conditioning units are needed to keep the home at a constant temperature using the same information as part a. (Hint:…
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Consider an ATM system that allows to: authenticate a user via a valid card and a valid PIN re-enter a PIN twice in case of incorrect PIN inquire balance withdrawn a valid amount of cash print a receipt transfer balance to other account Draw a transition system and enlist set of states S, set of actions A and set of transitions T.
5. Convert the nfa defined by 8(qo, a) = {qo,q1} 8(q1,b) = {q1,q2} %3D %3D 8(q2, a) = {q2} %3D 8(q1, A) = {q1,q2} %3D with initial state qo and final state q2 into an equivalent dfa.