When running at 4000rpm with an applied voltage of 42v, a DC permanent magnet motor develops 23.1W of output power. The motor has a theoretical no-load speed of 6000rpm at an applied voltage of 42v.

What is the motor output torque at 4000rpm in N-m, What is the motors theoretical back-EMF constant, What is the motors theoretical torque constant, What is the motors theoretical stall torque, What is the motors armature resistance, What is the motors efficiency at 4000rpm when operated at 42v.

Electric Machinery

What are the advantages of using three-phase induction motor as compared to single phase induction motors?

please write it with long details and with clear written

Check whether the indicated application is best represented by an open-loop or closed loop control system model.  If you think there is some ambiguity, discuss as necessary.

compare between the diffusion and ion-implantation processes for adding dopants in VLSI .technology

Using Matlab, write code to generate Three signal components

• We will use a sum of sinusoids, all of which are sampled at 10 kHz.

• Signal 1 should contain a sum of sinusoids with frequencies at 25Hz, 40Hz and 75Hz.
• Signal 2 should contain a sum of sinusoids with frequencies at 600Hz, 730Hz, and 800Hz.
• Signal 3 should contain a sum of sinusoids with frequencies at 3500Hz, 4000Hz, and 4200Hz.

• Choose a variety of amplitudes and phase shifts for the sinusoids.
• Plot 500-points time waveform of signal 1, signal 2 and signal 3.

Type an essay about "Transmission lines theory", explain with it; transmission lines effects and their causes, then state the difference between the propagation of electromagnetic waves in such structures and the propagation in an unbounded space, like free space
Your essay should not exceed one page

علي غسان اتصالات اسيا:
1. The source in the circuit provides the circuit with electromotive force. *

Current moves from a point of high potential energy to a point of low potential

Inert gas white, glowing, or luminous with intense heat

4. Electronic equipment and transformers may also use a special electrical grade of paper. *

5. In solutions and gases, the electric current is carried by the movements of electrons. *

6. Absolute zero is the lowest temperature theoretically possible, characterized by complete absence of heat (thermal energy). *

7. A material which does not easily release electrons is called conductors. *

8. A piece of magnesium has potential energy stored in chemical form that is expended in the form of heat and light. *

9. The kinetic mechanical energy of the moving rotor of a dynamo is changed into kinetic electrical energy by electromagnetic induction. *

10. The filament of a light bulb emits intense light when heated by a current *

11. The color of the light will vary according to the resistance. *

12. Silver is an insulator. *

13. The metal chassis of many electrical devices are used to conduct current. *

14. A non-metal which conducts well is carbon. *
false or true

Question 28 (1 point)

The output of a peak detector is always

A) equal to the max value of the peak level received since the last reset pulse.

B) 70.7% of input.

C) equal to the min value of the peak level received since the last reset pulse.

D) None of the above.

Question 33 (1 point)

If an operational transconductance amplifier (OTA) is used as a nonlinear mixer and an audio signal is mixed with an RF signal, the output will be a(n) ________ signal.

A) frequency modulated (FM)

B) amplitude modulated (AM)

C) triangular wave

D) square wave

Hello, it will be a great help to get these two clarified. I am unable to locate any reference to these in the chapter. My reference material is "Electronic Devices by Floyd 10th ED Chapter 14"

Thank you.

A three phase transformer of 400kVA, 10kV/400V, Dy11 is connected to its nominal load with cosφ = 1.

a) Calculate the nominal primary and secondary line current.
b) Calculate the corresponding currents in the primary and secondary winding.

At an open circuit test, the primary line current is 0,52A with cosφ = 0,05 at nominal line voltage.
The short circuit test (at nominal current) shows 214V primary line voltage and P=1,333kW per phase.

c) Calculate the total iron losses and total copper losses of this transformer.

d) Calculate the efficiency η of this transformer.

Now the transformer will be loaded with 210kW with cosφ = 0,83 (lagging).

e) Give both the iron losses and the copper losses as a percentage of what they are nominally.

Please show process and computations with comments.

1. 414 Volt, 60 Hz, 600 hp, 0.6 pf-leading, four-pole triangle connected synchronous motor has 0.9Ω synchronous reactance. Friction; wind; core losses and armature resistance are neglected.
a) If the motor is operating under magnitude of phase current (ia) 234 Ampere and power factor of 0.6 lagging,
1. Find the input power of motor in hp (10p)
2. Find the generated voltage, EA (10p)
3. Find the torque and the maximum inducible torque in current state. (10p)
b) If EA is increased by 18% find,
1. Magnitude of new armature current (ia), (10p)
2. New power factor of motor. (10p)
(X is the last two digits of your student number × 2. For example: If student number is 20-156-120, X=54. Motor voltage is found 360+(54*2) = 468V.)
(Please use at least 4 digits after decimal point in your calculations. Otherwise, there may be problems about exact answers.)

Write a 3-4 paragraphs report about electric circuits submit it (why do we use circuits) typed please

Design a Butterworth bandpass filter with the given requirements:

10 dB stopband attenuation at 100 rad/sec and 900 rad/sec

1dB passband attenuation at 400 rad/sec and 600 rad/sec

A coaxial cable is made of two conductors, the inner one has radius a and the outer radius is b, both conductors are seperated by a dielectric material with relative permitivity ε_r  and conductivity σ , what is the conductance per unit length of this insulating material. Show all steps you followed to obtain the final expression.

Synchronous and Induction Machine Questions

Q1: How do we find induced voltage, frequency, synchronous reactance, generated voltage at pf for a synchronous generator?

Q2: How do we find slip and number of poles, speed of rotor, load torque, induced torque in a induction motor?

Q3: Based on an induction motor test(no-load, blocked-rotor test)- what are the circuit parameters and how do we draw the circuit?

Q4: For a synchronous machine, how do we draw phasor diagram?