Computer science Engineering ..

It is found that each thunder cloud may contain as many as 40 charged cells and a heavy lightning stroke may occur. This is known as multiple stroke. 1.2.3 Line Design Based On Lightning The severity of switching surges for voltage 400 kV and above is much more than that due to lightning voltages. All the same it is desired to protect the transmission lines against direct lightning strokes. The object of good line design is to reduce the number of outages caused by lightning. To achieve this following actions are required. (1) The incidence of stroke on to power conductor should be minimized. (ii) The effect of those strokes which are incident on the system should be minimized. To achieve (i) we know that lightning normally falls on tall objects; thus tall towers are more vulnerable to lightning than the smaller towers. In order to keep smaller tower height for a particular ground clearance, the span lengths will decrease which requires more number of towers and hence the associated accessories like insulators etc. The cost will go up very high. Therefore, a compromise has to be made so that adequate clearance is provided, at the same time keeping longer span and hence lesser number of towers. The lightning stroke injects its current into a termination impedance Z, which in this case is half the line surge impedance Zo since the current will flow in both directions as shown In Figure1.3. Therefore, the voltage surge magnitude at the striking points = (42) IZO The lightning current magnitude is rarely less than 10 kA. For typical overhead line surge impedance Zo of 300 N, the lightning surge voltage will Probably have a magnitude in excess of1500 kV. (1/2 1/2 Zo 31 Zo U-170/2 QUESTION 8 Stephanie is a wedding planner with a small home-based wedding planning business, which she runs with the help of one assistant. When she decides to expand her business and hire two more assistants, she buys two Windows 10 desktop computers in addition to the one her current assistant uses. She sets up local user accounts for each assistant on each computer, which allows her assistants to access information stored on each other's computers using unique user IDs and passwords. Which of the following Windows 10 networking models does Stephanie's business use? a. The Open Systems Interconnection model b. . The domain model C. Azure AD join d. The workgroup model 11:41 am