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Electrical Engineering
A balanced Y load having a 15+j25 Ω load impedance in each leg is connected to a three-phase, four-wire, Y-connected generator having a line voltage of 230 V. The line impedance per phase is 0.5+ j1.5 Ω . Answer the following:
a. Draw the circuit showing the given values.
b. Calculate the line voltages of the load.
c. Calculate the phase currents of the load.
d. Calculate the power consumed by the 3-phase load.
Electrical Engineering
Assume that we need an 8031 system with 64KB of program space and 192K bytes to store data in an
available NV-RAM chip having 256K bytes capacity. (a) Show the connection of the 8031 to this single
256K×8 NV-RAM chip. (b) Show how various blocks of this single chip are accessed.
Electrical Engineering
0.05 m3 of a perfect gas at 6.3 bar undergoes a reversible isothermal
process to a pressure of 1.05 bar. Calculate the heat flow to or from the
gas.
process to a pressure of 1.05 bar. Calculate the heat flow to or from the
gas.
Electrical Engineering
You are designing the windows of an aeroplane. Would you design them as squares, ovals or hexagons? Justify your answer
Electrical Engineering
circuit isolation can be achieved using
A. a NAND gate
B. a tank circuit
C. a Hartley oscillator
D. two NOT gate in series
A. a NAND gate
B. a tank circuit
C. a Hartley oscillator
D. two NOT gate in series
Electrical Engineering
silicon diode has a saturation current of 10na at 300K . Calculate the forward current if the forward drop is 0.5v . If the diode is rated for a maximum current of 5A , what is it's junction temperature at rated current if the forward drop is 0.7v
Electrical Engineering
With the aid of diagrams and sketches, discuss with relevant site locations, 16 means of power generation(station)
Electrical Engineering
QA proportional controller is used to control the temperature in a tank,
which varies from 20 0C to 100 0C. The controller is required to close the valve
on steam supply when temperature rises to 80 0C and open the steam supply
when temperature drops to 20 0C. Set point is 60 0C.
[1]. Calculate proportional band and controller output when temperature in
the tank is 50 0C.
[2]. For the above process, design an electronic controller around a single
op-amp. Controller output is 0-5 V; voltage varies linearly from 1 V to 5 V
when temperature varies from 20 0C to 100 0C. Zero corresponds to 50 %
controller output.
[3]. Draw and label the closed loop with electronic controller.
which varies from 20 0C to 100 0C. The controller is required to close the valve
on steam supply when temperature rises to 80 0C and open the steam supply
when temperature drops to 20 0C. Set point is 60 0C.
[1]. Calculate proportional band and controller output when temperature in
the tank is 50 0C.
[2]. For the above process, design an electronic controller around a single
op-amp. Controller output is 0-5 V; voltage varies linearly from 1 V to 5 V
when temperature varies from 20 0C to 100 0C. Zero corresponds to 50 %
controller output.
[3]. Draw and label the closed loop with electronic controller.
Electrical Engineering
Q.3 (a) Measurements conducted on a servomechanism show the system
response to be:
C (t) = 0.3 e60t + 1.5 e10t
, when subjected to a unit step input.
[1].Obtain the expression for the closed-loop transfer function.
[2].Determine the undamped natural frequency and damping ratio of the
system.
Q.3 (b) A Tank system having a time constant of 0.5 min and a resistance of
0.25 min /m2
is operating at steady state with an inlet flow of 2m3/min. The
flow is suddenly increased to 3m3/min. Plot the response of the tank level
(Assume area of cross section A = 2 m2).
Q.3 (c) Describe the Hardware elements of a process control system.
Differentiate the process lag and control lag with suitable example.
response to be:
C (t) = 0.3 e60t + 1.5 e10t
, when subjected to a unit step input.
[1].Obtain the expression for the closed-loop transfer function.
[2].Determine the undamped natural frequency and damping ratio of the
system.
Q.3 (b) A Tank system having a time constant of 0.5 min and a resistance of
0.25 min /m2
is operating at steady state with an inlet flow of 2m3/min. The
flow is suddenly increased to 3m3/min. Plot the response of the tank level
(Assume area of cross section A = 2 m2).
Q.3 (c) Describe the Hardware elements of a process control system.
Differentiate the process lag and control lag with suitable example.
Electrical Engineering
1kg of air enclosed in a rigid container is initially at 4.8 bar and 150 °C. The container is heated until the temperature is 200 °C. Calculate the pressure of the air finally and the heat supplied during the process
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#339914 on Dec 2023
#339914 on Dec 2023