As a Field service team leader, What do you understand by the following:
1. Local access network
2.PABX equipment
3.Broadband
4.Access network field engineering
5.Voice over IP and PABX installation
6.CCNA
7.Rectifiers
8.Chiller Plants
9.UPS

THESE QUESTIONS ARE FROM THE SUBJECT ELECTRICAL MACHINES

1) DEFINE WARD-LEONARD SYSTEM AND HOW IT CONTROL THE SPEED OF MOTOR ,GIVE ITS ADVANTADGES AND DISADVANTADGES ??

2) WHAT IS RHEOSTAT SPEED CONTROL AND HOW IT CONTROL THE SPEED OF MOTOR , GIVE ITS ADVANTADGES AND DISADVANTADGES ??

3) WHAT IS FIELD SPEED CONTROL AND HOW IT CONTROL THE SPEED OF MOTOR , GIVE ITS ADVANTADGES AND DISADVANTADGES ?????

Implement 4-bit binary adder/subtractor using gate level. ( verilog code and test bench)

Explain various control methods for the stepper motor: Full-Step Single-Phase, Full- Step Two-Phase, and Half-Step current excitation sequences.

One of the advantages of using FACTS controllers/devices is can control the power flow during malfunction occurs in the power grid system and thus can prevent a blackout caused by grid malfunction. What is the FACTS controllers' function in such a situation? Explain and elaborate on your answer in detail.

Describe the principles and operations of distance sensor: potentiometer, linear variable differential transformer (LVDT), and optical encoder, state the advantage and disadvantage of each type of distance sensors.

A 200 km, 2.5 Gb/s communication link consists of four spans and three optical amplifiers. The transmitter power is 0 dBm and the fiber loss is 0.25 dB/km. Assume the receiver bandwidth ∆f = 0.7B and responsivity of 0.8 A/W. The operating wavelength is 1.55 µm.
a) What is the span loss? What is the optimal amplifier gain for maximum SNR?
b) If each amplifier has a 4 dB noise figure, then what is the SNR at the output of the last amplifier?
c) Whatis the receiver sensitivity (Q=6)? Will the system work as designed?

Explain what is a short and medium line model in a transmission line. And differentiate a Nominal T and Nominal pi method

Describe the principles and operations of a Solenoid and a Relay; State the difference between a solenoid and a relay; State the advantage and disadvantage of a solenoid and a relay.

Obtain an expression of wave equation of a conducting medium

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.