Explain briefly the driving procedure of the following
system using suitable diagrams.
i. Electrostatic system
ii. Pneumatic system
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The controlled full wave rectifier is connected to the grid. The rms grid voltage is 230 Volt at 50 Hz. 24 Volt battery will be charged with 15A. An inductor, which is series connected to the battery, is used to limit the current ripple. Only The second harmonics of the output voltage is taken into account. The inductor R/L ratio is 50. The current ripple is allowed to be 4 amp peak to peak. Determine the firing angle and R for the circuit, for this design. Write the mat equations and Show the solution with detail.
a) alfa=? ( in rad ) b) R=?
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Where are the Galilean Beam Expander and Keplerian Beam Expander used? Give at least two examples of each and elaborate on their uses.
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Define the limitations in the operation conditions of a p-n junction.
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a) How to measure current with an oscilloscope? Describe by drawing a figure. b) Describe how the shape on the screen will be if volts of Vx= 10.sin (wt) are applied to the horizontal input of the oscilloscope Vx= 10.sin (2wt) and vertical input Vy= 10.sin (2wt). the name is this course introduction to electronic
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Suppose the velocity of an electric vehicle increases linearly,
becomes constant for some
time and then decreases linearly. Sketch this profile and show the
region(s) where the
vehicle’s tractive force is negative. Give reason. (08)
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For (8) questions only, choose the correct answer
1. The variations in pressure and temperature generally have only a
small effect on liquid
density.
o True
o False
2. Ratio between the density of the fluid to the density of the
standard fluid is
o Specific weight
o Specific volume
o Specific gravity
3. The viscosity of liquids increases with the increase of
temperature while the viscosity of gases
decreases with the temperature increase.
o True
o False
4. − − − − − is used to measure small differences in gas
pressures.
o Piezometer tube.
o Differential manometer
o Inclined-tube manometer
o U-tube manometer
5. The pressure of fluid at rest is independent of pressure
direction as long as there are no
shearing stresses present.
o True
o False
6. In − − − − − flow, the velocity at a given point may differ from
other points along the
streamline but do not change with time.
o Uniform
o Non-uniform
o Steady
o Non-steady
7. When the application requires a great amount of
power, pneumatic system is used.
o True
o False
8. − − − − − lies along the median line of the body which divides
the shape into two equal
parts.
o Center of pressure (Cp)
o Centroid (C)
o Center of gravity (CG)
9. In laminar flow, each particle of the fluid follows a smooth
path, usually at low velocities,
which never interferes with one another.
o True
o False
10. − − − − − is a control valve that reduces the input pressure of
a fluid to a desired value
keeping the operating pressure constant.
o Relieve valve
o Regulator valve
o Check valve
o Shut off valve
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Consider Wein bridge oscillator. If R1 = 3R2 and C2 = 4C1, find
the expression for cutoff
frequency. What will be the value of β and the required gain?
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What role does introduction Play in a research Proposal?elucidate.( Subject:Techincal report writing)
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An ideal long-base Si p-n diode has Na = 1017 cm-3, Nd = 7x1016 cm-3 and a cross-sectional area of 10-3 cm2. (i) If τn = τp = 1 µs, calculate the current flowing through the junction under an applied bias of 0.4V. Repeat your calculation for a temperature of 500 K. (ii) Sketch the thermal equilibrium band edge diagram of the p-n junction for both temperatures
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A 400 V dc shunt motor has a rated armature current of 76 A at a speed of 1000 rpm. The armature resistance of the motor is 0.4ohm, the field resistance is 100 ohm, and the rotational losses are 0.9 kW. The load of the motor is bidirectional. Calculate the following:
(a) No-load speed of the motor.
(b) Motor speed, where the armature current is 60 A during regenerative braking.
(c) Developed torque during regenerative braking.
(d) Back electromotive force, ea during regenerative braking.
(e) Power delivered by the source under normal motor operation.
(f) Terminal current under regenerative braking.
(g) Generated power during regenerative braking.
h) Total losses under regenerative braking.
(i) Power delivered to the source under regenerative braking.
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Explain the similarities and differences between convolution of discrete signals and convolution of continuous signals
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What does it mean to use an open collector? What role does the "pull-up" resistor play?
Say device "A" wanted to send a "1" on the wire, what would device A need to drive? What would the other devices be driving when they weren't trying to use the bus?
Say device "A" wanted to send a "0" on the wire. What would device A need to drive? What would the other devices be driving when they weren't trying to use the bus? i. ii. iii.
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Compare the brushed motor (DC motor) and a brushless motor (Induction Motor) in FIVE aspects.
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-What is the importance of determining the characteristics (Zin, Zo, AV, Ai) of the voltage amplifier (BJT) ?
- What is the importance of using the capacitors (CB, CC, and CE) in voltage amplifiers (BJT) ?
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