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A 230V DC shunt motor has an armature resistance of 0.05 ohms. When connected to a 230V direct current supply it develops a back emf of 225V at 1200rpm.a) Calculate the armature currentb) Calculate the armature current at startc) The motor is now used as a generator. Calculate the speed of the machine if the armature current is 80A and there is a 230V at the motor's terminals. Assume a constant flux.
Calculate the critical clearing angle and plot the swing curve for the machine - What is the power angle at the end of the 10 cycles?
A 20V voltmeter with a sensitivity of 10,000 ohms / volt rating and a 5A ammeter are used to measure the power being dissipated in a dc circuit. The voltmeter reads 13V and the ammeter 2.1A.
A laser (wavelength fo = 633 nm) is generating a Gaussian beam with 0.1 mm beam waist (2wo). (1) Find the beam's divergence angle and depth of focus (2) What will be its diameter when it reaches Moon
Ted Williams hits a baseball with an initial velocity of 120 miles per hour (176 ft/s) at an angle of f = 35 degrees to the horizontal. The ball is struck 3 feet above home plate. You watch as the ball goes over the outfield wall 420 feet away
Do either or both of the reasons you gave in part (a) above also apply to a point to point voice link using frequency modulation? c. Which parameter of an FM transmission determines whether it is wideband or narrow band?
In the presentation, the presenter, Mr. Rob Tucker discussed three types of disturbance mitigation responses or measures. List the three mitigation types and give a short definition of each of the mitigation type.
Explain the term 'multiplexing' in general and describe why it is particularly important in the transmission of PAM signals and describe the main factors upon which the maximum data rate over a channel depends.
If the concentration of free electrons is 10^29 electrons per cubic meter and if they are uniformly dispersed throught the wire, then what is the average velocity of an electron ?
Discuss how energy is stored in capacitors and inductors. Are the equations linear or non-linear How do you know? Discuss the concept of duality and why it applies to many fundament engineering concepts.
A voltage v(t) = 359.3 cos(wt) is applied to a load consisting of a 10 resistor in parallel with a capacitive reactance XC = 25. Calculate The instantaneous power absorbed by the resistor The instantaneous power absorbed by the capacitor
Suppose a data array has 30 numbers sorted from low to high already, where no two numbers are equal. We need to search whether any of the two randomly given key numbers, key1 and key2 is in the array. If yes, then find out the position index(es) f..
Calculate the required thickness [in x-direction] of a silicon wafer in nm to create an 0.2 eV energy difference between the two lowest Enx energy states, use mn*= 0.3 x mo with mo = 9.11x10-31 kg. Assume the y and z-direction infinitely long.
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