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1. Why is DFIG not considered for motoring applications for speed range from zero to rated speed?
2. Equation relates stator voltage, rotor voltage, and torque. Use a spreadsheet program to develop a macro to plot a family of curves in relation to the input parameters.
Assume the following machine parameters Rs = 0.598 Ω, Rr= 0.271 Ω, Lls = 3 mH, Llr = 1.2 mH, Vs = 220 V, Vr = 10 V, p = 4, and ωe = 377 rad/s. 11.5 Study the article by Da Silva et al.19 Propose a modern and contemporary circuit and control techniques to achieve a similar system performance for a DFIG wind- or hydro-based energy system
A proton is placed in an electric field of intensity 700 N/C. What is magnitude and direction (towards or away from the field) of the acceleration of this proton because of this field? The charge on a proton is +1.6 x 10-19 C and the mass of a prot..
A person stands on a bathroom scale in a motionless elevator. Calculate the acceleration of the elevator
question a 0.900-v potential difference is maintained across a 1.50-m length of tungsten wire that has a
Two objects (m1 = 2.15 kg and m2 = 4.30 kg) sit on a horizontal, frictionless surface and are pushed together with a compressed spring between them. How much energy was stored in the spring
A large storage tank is filled to a height 81 cm. The tank is punctured with a small hole at a heiht of 38 cm from the bottom of the tank. How far from the tank will the stream land
q1. the sound level measured in a room by a person watching a movie in a home theatre system varies from 66 db during a
An oil drop carries one excess electron and weighs 9.2 10-15 N. What electric field strength is necessary to suspend drop so it is motionless.
The beaker is filled with 20 degrees C water to a level 50cm above the hole, and it is continually topped off to it maintain that level. What is the volume flow rate through the tube?
The diameter of the moon is 3.78x10^6 m. It subtends an angle of 0.00982 radians at the surface of the Earth. How far is the Moon from the Earth
A projectile is launched with an initial speed of 40.0 m/s at an angle of 30.0° above the horizontal. What is the straight-line distance from where the projectile was launched to where it hits its target
Two packages at UPS start sliding down the 40 degree ramp. Determine how long does it take package A to reach the bottom
A circular hole is punched out of a circular disc such that the diameter of the circular hole is a radius of the disc.If the diameter of the disc is 10cm,find the centre of gravity of the remainder.
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