Explain counter or back e.m.f. in d.c. motor and state its importance.
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Design a microcomputer system using a uP 8086 10 Mhz. This system must have a Coprocessor 8087, a parallel connector, a serial connector, ADC and DAC connector for data conversion, a 16 byte seven segment display, a 64-key matrix keyboard, a USB connector thru a DMA for high speed data transfer. A special connector to connect a printer. The system must have an interrupt controller to handle all the I/O interface. The main memory size will be 1 Mbyte.
Show all the diagrams needed to construct your design including all the I/O interface and devices connected, show a memory map and the type of memory you will need for you design including the configuration and decoding system. You must include the programming needed for set up the complete system. Use pseudo code for each driver and program each of the interface needed.
In: Electrical Engineering
Question 5
The following test data was captured from a 15hp, 4-pole, 400V,
Design A, Induction motor. The star-connected machine has a rated
current of 50A.
No-Load Test
VT = 400V
f = 50Hz
IA = 12A
Pin = 650W
IB = 12.1A
IC = 12.05A
16
DC Test
V = 15V
I = 50A
Locked Rotor Test
VT = 35V
f = 15Hz
IA = 50.1A
Pin = 1850W
IB = 49.5A
IC = 48.75A
5.1
Calculate the parameters of the equivalent circuit.
(7)
5.2
Draw and label the equivalent circuit and include the calculated
values of the respective circuit parameters.
(3)
5.3
Find the slip at the pull-out torque. Calculate the pull-out
torque.
(5)
[15]
In: Electrical Engineering
Using vhdl in a FSM , how could you write code to delay a state change for one hour? For example, you have a fan running in the 'on' state , but after 1 hour you would like that fan to switch back to the 'off' state. What is the best way going about doing this?
In: Electrical Engineering
write the code in MATLAB with comments and show the inputs and results of the code for the question below.
Write an .m file in MATLAB, that records audio (you can record your own voice for 20 seconds that was recorded using your phone), then take Fourier transform of the signal (probably FFT).
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From the solar constant and the average distance between the sun and the earth, estimate (a) the total power emitted by the sun, in megawatts, and (b) the mass loss of the sun, in tons per day
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Write a description of RCDs used in homes – include their ratings, the number of RCDs required, how to identify them in the power board, variations, related standards, how often they are performance tested. Add relevant the technical specifications of the manufactures.
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Can resistor be measured in live circuit and what will happen? Will the reading be accurate?
In: Electrical Engineering
Question 4 (20pts) The equation of a circle can be represented parametrically as
?? = sin (??)
?? = cos (??)
where ?? varies from 0 to 2*pi. Create a Simulink® model to parametrically graph a circle using the ???? graph block found in the sink library. To model cosine, you will need to modify the Sin block.
Take a screenshot that includes
• Simulink model
• Answer
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Design an Moore FSM for an 8-interval stoplight system where the red light is ON (yellow and green lights are OFF) for 4 intervals, then yellow light is ON (red and green lights are OFF) for 1 interval and then green light is ON (red and yellow lights are OFF) for 3 intervals. After the green light has been ON for three intervals, we go back to the red light being ON for 4 intervals. Use binary encoding for states and use JK FFs for storing the state. You have report the state machine (using 8 states), state table, Boolean expression and a gate-level diagram (FFs + combinational logic).
In: Electrical Engineering
A servomechanism has an open loop transfer function of
G(s) = 10 / s (1+0.5s) (1+0.1s)
Draw the Bode plot and determine the phase and gain margin. A networks having the transfer function (1+0.23s)/(1+0.023s) is now introduced in tandem. Determine the new gain and phase margins. Comment upon the improvement in system response caused by the network
In: Electrical Engineering
how to write coding in matlab using gauss elimination method for equation
10a + 50b + 20c + 10d = 100
5a + 15b + 75c - 25d=200
25a -15c - 5d = 300
10a + 20b - 30c + 100d = 400
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|
Q5 |
A 3-phase, 60 Hz, 500 V, delta connected motor develops mechanical output of 250 H.P., the power factor being 0·7 lagging (without capacitors) and motor efficiency 88%. A bank of series capacitors is connected in delta across the supply terminals. Two similar capacitors connected in series exist in each phase. Each of these capacitors is rated at 250 V, 800 µF. What is the new power factor of the motor after connecting the capacitor bank, also find out saving in the KVAR absorbed from power supply after improving power factor? |
Figure1(Feeder comes from this side)
In: Electrical Engineering
In: Electrical Engineering
Use the sine wave and scope in the Simulink library (MATLAB) to generate and observe the following waves:
a. ?1 (?) = sin ??
b. ?2 (?) = cos ??
c. ?2 (?) = 0.5 cos ??
d. ?3 (?) = cos (?? − ?) ? = 1 ???/s
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