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Multiple Choo questions
Question 10
Question 8
The economic dispatch problem describes:
(1) How the real power output of a controlled generating unit is selected to meet a
given load and to minimize the total operating cost
(2) How the reactive power output of a controlled generating unit is selected to meet
a given load and to minimize the total operating cost
(3) How the levels of power generation can be adjusted to maximise the total
operating cost.
(4) How power plants can be built economically. Question 7
The regulator:
(1) Supplies current to the rotor.
(2) Converts ac to dc from voltage transformer.
(3) Controls generator terminal voltages.
Multiple Choo questions
Question 10
Th goal of the equal area criteria in transient stability is to determine whether a system
is stable or not without having to completely integrate the system response. The
system will be stable after the fault if:
(1) The acceleration area is greater than 1.0 per unit.
(2) The acceleration area is greater than the deceleration area.
(3) The deceleration area is smaller than the acceleration area.
(4) The deceleration area is greater than the acceleration area.
Allow the user to input from the keyboard the desired percent overshoot
Design a PI controller and gain to yield zero steady-state error for a closed-loop step response as well as meet the percent overshoot specification
Display the compensated closed-loop step response
Test your program on and 25% overshoot
Power station A delivers 640 MVA to its consumers at a power factor of 0.766 lagging.
Power station B delivers 560 MVA to its consumers at a power factor of 0.7071 lagging.
Two three-phase generating power stations A and B work at (86.077+j18.296) kV and (131.277+j13.798) kV respectively.The two power stations are inter-connected via a transmission line with an impedance of (6.59+j16.672) Ω/phase. The phase-regulator at power station A is adjusted such as to reduce the loading at power station A by 82 MW.
Take machine A as leading machine.
Use standard formulae to the following calculations.
Determine the total active power delivered or received by Power station A (Pi) in MW
In an unbalanced, three-phase, star-delta system has a frequency of 50 Hz, and CBA phase rotation.The phase impedances
of the load are as follows:
Zab =29.41∠ 54.69°Ω ; Zbc=25.61∠-38.66° Ω ; Zca =17.8 ∠ 51.84° Ω
The emf of the source is represented by:ec(t)=221.831 𝐬𝐢𝐧 (𝛚𝐭 +(𝟓𝝅/𝟏𝟖) ) V
Calculate the phase current,( Iab, Ibc & Ica) of the load in polar form.
Calculate the active power( Pab, Pbc , Pca) in phase AB of the load in phasor form.
Determine the line current,( Ia, Ib & Ic) in polar form.
If two wattmeters are connected in lines a and b respectively of the above circuit to
measure the active power,
Determine the reading of the wattmeter,(Wa) connected in line a.
Determine the reading of the wattmeter,(Wb) connected in line b.
1) Develop an argument on the fact that Even parity (4,3) code is a linear block code whereas an Odd parity (4,3) is not based on the three basic conditions for linear block codes.
2) What is hamming distance? Write Cyclic codes of a (4,7) encoding scheme and calculate the minimum and maximum hamming distance.
3) Draw the look-up table, trellis diagram, tree diagram and state diagram for a (2,1,4) convolution encoding scheme.
waveguide is filled with air and the operating frequency is 50MHz. Find the
propagation constant, guide wavelength and cut off frequency for TE10,
TM11 and TE20 modes.
Assume a rectangular waveguide with dimensions a=2 cm and b=1cm. The
waveguide is filled with air and the operating frequency is 50MHz. Find the
propagation constant, guide wavelength and cut off frequency for TE10,
TM11 and TE20 modes
Identify the following conic and hence reduce it in its standard form:
5x2-24xy-5y2+4x+58y-59=0
#339914 on Dec 2023