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.

If you use your office computer 15 hours per week, and do not unplug it when it is not in use, how much carbon dioxide is produced from the vampire energy used by the office computer in one year ? help (energyvampires)

Express your answer rounded to the nearest tenth of a pound of carbon dioxide.
lb of CO2

Stand-by Power Consumption by Type of Appliance

1)Describe briefly the different types of d.c. distributors.

2. What are the advantages of a doubly fed distributor over singly fed distributor ?

3)What is the purpose of interconnector in a d.c. ring main distributor ?

4)What are the advantages of 3-wire distribution over 2-wire distribution ?

5)8. Explain the use of rotary balancer in a 3-wire d.c. distribution system

6)What is a booster ? With a neat diagram, explain how it can be used on a feeder

AC Thevenin has an impedance of Zt = 6 + j75

What is the load impedance for MPT?

If a resistor was connected as load, what would the R value need to be for MPT?

2. Design a digital lowpass filter to meet the following specifications:
passband edge = 0:45π
stopband edge = 0:5π
Rp = 0.5 dB, As = 60 dB

a. Design a Buttterworth filter, you may use the butteworth and butter commands to implement.

b. Design Chebyshev Type 1 filter ( use the equivalent commands to above )

c. Design an Elliptic filter ( use the equivalent commands to part a ).

d. List the order of each filter and find the actual Rp and As for each filter. To find the ripple
and attenuation values you should use freqz to output the frequency response h and frequency w
values to a vector at enough points , say 1000, then use the min or max commands to find the
min or max in the passband or stopband range in the frequency response. You may need to use
commands to convert to dB.

e. Plot the magnitude response (in dB) for all three filters on one plot and plot the phase
response for all three filters on another plot ( title the graph, label axes, and use a legend to
identity the filter )

Please include Matlab code. EVEN JUST PART A HELPS

Q2. (i) Design a 2-input 1-output multiplexer, inside a hierarchical block. Explain your design. Name your block with your student number: eg “123456 multiplexer”.

(ii) Test your circuit in block form, showing the truth table from Multisim.