Consider the classical power system where one generator is connected to the infinite bus through two transmission lines. We want to study the transient stability for a fault on one of the two lines. The generator parameters are as follows: Pm = 1, H = 4, KD = 5, x'd = 0.25, E' =1.4. The transmission line where the fault occurs has a line reactance of 0.6 pu. The other transmission line that remains in service has a line reactance of 0.75 pu.a) Suppose the fault occurs at the middle of the line. Write out the swing equations for the pre-fault,fault-on and post-fault systems.

MATLAB ONLY:

Write a user defined method MaxPath()

Find the maximum path sum in matrix. The maximum path is sum of all section from first to last
row where you can move only down or at a angle to left or right. You can start from any section
in first row of given matrix of P*Q.
Input: mat [] [] = 10 10 2 0 20 4
1 0 0 30 2 5
0 10 4 0 2 0
1 0 2 20 0 4
Output: 74
The maximum sum path is 20-30-4-20.
Input: mat [] [] = 1

Design a second-order band-pass filter using resistors and capacitors for a microphone for a hearing aid, which allows signals in the range of 1 to 16 kHz to pass through. For the component values that you chose, at what frequency is the transfer function at a maximum?

Briefly explain the difference between input bias current and input offset current and the ideal, practical values for both currents.

A semiconductor diode, the forward and reverse characteristics of which can be considered ideal, is used in a half-wave rectifier circuit supplying a resistive load of 1000Ω. If the r.m.s. value of the sinusoidal supply voltage is 230 V determine: (a) the peak diode current; (b) the mean diode current; (c) the r.m.s. diode current; (d) the power dissipated in the load

The following test data apply to a 110 kVA, 2300 V three-phase four-pole 60 Hz induction motor.

No load test at rated voltage and frequency: Load current = 8.1 A, Three-phase power = 3025 W

Blocked-rotor test at rated current and 15 Hz: Line voltage = 268 V, Three-phase power = 10.2 kW

Stator resistance between line terminals = 2.34 Ω.

Compute the stator current and power factor, kW output, and efficiency when this motor is operating at rated voltage and frequency with a slip of 2.8 percent.

Can measurement noise affect the DAC resolution estimate? Please explain with a simple example.

Almost all FM radio stations transmit digital FM signal. Explain how the fully analog FM has been converted to fully digital FM.

Analyze the following Verilog code and write down its output as pictured in the code.

module blocking;

reg [0:7] A, B;

initial begin: init1

A = last decimal digit of your ID;

#1 A = A + 1; // blocking procedural assignment

B = A + 1;

$display("Output 1: A= %b B= %b", A, B );

A = last decimal digit of your ID;

#1 A <= A + 1;

B <= A + 1;

#1 $display ("Output 2: A= %b B= %b", A, B );

end

endmodule

As an Electrical Engineer, you have been asked to design a receiver that detects a particular sequence of bits transmitted from a remote transmitter. Your system is a MEALY machine that has an input ‘w’ and an output ‘z’ that produces z=1 when the previous two values of w are 00 or 11 otherwise it should give z=0. Please note that there would be only 3 states. Draw the corresponding state diagram and state table.

Question 4

a) Explain the operation of a CMOS transmission gate, illustrating the component symbol, MOS transistor circuit and function table. [3 marks]

b) Draw the XNOR (F = (A.B + A.B) logic circuit implemented using

CMOS transistor-based logic.

CMOS transmission gates.

Compare the transistor count for each implementation. [4 marks]

c) Draw and label a CMOS transmission gate circuit for a 4-to-1 multiplexer, using the following signal names:

sel(1:0) input data path select signal

muxIn(3:0) 4 x 1-bit input data signals

muxOut 1-bit output data signal

Illustrate the state of all circuit nodes for the following input signal states: sel = “10”, muxIn = “0101”. [5 marks]

23 hp, dc shunt motor is running at 1000 rpm when the armature voltage is 600 V. The armature resistance of the motor is 0.8 ohm, and the field resistance is 900 ohm. The efficiency of the motor at full load is 92 %.

a) Calculate the value of the resistance of the dynamic braking at full load. The armature current should be limited to 150% of the rated value.

b) If the motor operated in regenerative braking at a speed of 1100 rpm, calculate the line current.

c) Design a circuit for countercurrent braking (by reversing supply voltage) so that the line current will not exceed 120% of the rated value.

Q14 Describe a maintenance plan for: a) Vacuum, and b) SF6 breakers • Cover the two types separately. • Be specific and do not list generic information (some research may be required). • List any special precautions during maintenance. • 10 + 5 = 15 marks.

Consider an NPN BJT with the following parameters. Beta = 85, Cmu = 1 pF, Co = .5 pF, and Cpi = 6 pF. With IC = 70 mA, r0 = 50 Ohms. RLOAD = 50 Ohms and RSIG = 1K. The available power supply is +12V DC. All coupling caps are 1 uF. Design an amplifier circuit using this transistor with a gain of -50. Calculate the upper and lower 3 dB points of your design. There is a 10% bonus for showing that your circuits works properly in simulation.