Consider a residential network that connects to the internet with a DSL link that has a download rate of 4 Mb/s. Assume that there are three UDP flows sharing the link and the remote hosts are sending at rates of 1 Mb/s, 2 Mb/s and 3 Mb/s. Assume that the ISP router has a link buffer that can hold 300 packets (assume all packets have the same length).

a) For each flow, what fraction of the packets it sends are discarded?

b) For each flow, about how many packets does it have in the queue.

c) Now, suppose the queue at the ISP router is replaced by three queues that can each hold 100 packets and that the queues are scheduled using weighted-fair queueing, where the weights are all 0.33. In this case, what fraction of packets are discarded from each flow?

d) How many packets does each flow have in the queue?

e) Now, suppose the weights are 0.2 for the first flow, 0.6 for the second and 0.2 for the third. In this case, what fraction of packets are discarded from each flow?

f) How many packets does each flow have in the queue?

Distinguish between a Shunt, a Series, a Separately Excited, and a Compound DC Motor.

Explain the High Voltage Generator with using 'Fly Back Transformer'.

Explain DC motor control methods and the advantage/disadvantage of each method.

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Explain the operation of a Stepper motor; State the advantage and disadvantage of a Stepper motor; State the difference between a stepper motor and a DC motor.

In a buck converter, consider all components to be ideal. Let v0 = Vo be held constant at 5 V by controlling the switch duty ratio d. Calculate the minimum inductance L required to keep the converter operation in a continuous-conduction mode under all conditions if input voltage Vin ranges from 10 to 40V, and output P0 ≥ 5W and fs = 50kHz.

Given β=200, VBE=0.7V, and VT=0.025V as shown in Figure 3. Calculate the voltage gain vo/vi.

Explain the digital integrated-circuit design process and how it is applied to micro architectures, available design methods and tools?

Describe the principles and operations of proximity sensors: Inductive, Capacitive, and Photoelectric. State the advantage and disadvantage of each type of proximity sensors.

Design a Moore sequential circuit that has an input X and an output Y. The circuit detects the following sequence: 100 Your answer should include state diagram and state table. Hint. X= 0 1 0 1 0 0 0 1 1 1 0 0 1 0 1 Y= 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0

Describe the principles and operations of movement sensors: Doppler-Effect Velocity sensor and Spring-Mass Accelerometor; State the advantage and disadvantage of each type of movement sensors.

Compare the MOSFET, JFET , and BJT and identify the reasons these devices behave differently. What are the MOSFET vs. JFET vs. BJT pros and cons?

Q/ Draw the flow diagram of Stop-and-Wait protocol in the following scenario

• Frame 0 is sent, and acknowledged.
• Frame 1 is sent, but the acknowledgment is lost.
• Frame 1 is resent and acknowledged.
• Frame 0 is sent, but lost.
• Frame 0 is resent, and acknowledged.

Please consider FIRST 6 Character from your name and LAST 2 digits of your students ID. Calculate the checksum for the above text. The text needs to be divided into 2-byte (16-bit) words. Also check that the data is reached without any alteration using your checksum.

[ the text is MajedA08]

The expression below relates with the necessity of estimating the energy need in one country. Describe each component contains in the following expression. Explain the importance of estimating the future energy need.
M = M_Oe^at