A 90 percent efficient electric motor operating an elevator lifts a 10-ton load through a height of 60 ft. Calculate the energy required by the motor to do so.
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- Question#2 A linear machine has the following characteristics: B = 0.5 T into page I = 0.5 m R= 0.25 Q Vg = 120V a. If this bar has a load of 20 N attached to it opposite to the direction of motion, what is the steady-state speed of the bar? b. If the bar runs off into a region where the flux density falls to 0.45 T, what happens to the bar? What is its final steady-state speed? c. Suppose VB is now decreased to 100 V with everything else remaining as in part (b). What is the new steady-state speed of the bar? d. From the results for parts (b) and (c), what are two methods of controlling the speed of a linear machine (or a real de motor)?An electron synchrotron of 6 x 109eV, electrons march through the machine in a roughly circular path 240 meters long. It is normal to have around 1011 electrons circulating in this path during an acceleration cycle. The speed of electrons is practically that of light. What is the current?a 3phase,4-pole,24slots alternator has its armature oil shot pitch by one slot. its pitch factor will be? Subject: Electrical machine 2
- You are working as an electrician in a large steel manufacturing plant, and you are in the process of doing preventive maintenance on a large DC generator. You have megged both the series and shunt field windings and found that each has over 10 M to ground. Your ohmmeter, however, indicates a resistance of 1.5 across terminals S1andS2. The ohmmeter indicates a resistance of 225 between terminals F1andF2. Are these readings normal for this type machine, or is there a likely problem? Explain your answer.2. Describe the principle of electromagnetic induction and its importance in electrical engineering. please answer in typing format for like please don't use Al answerAn iron ring one meter mean circumference is made from an iron rod of round cros section 10 sq.cm. It is wound for 200 turns. What current would be necessary to produce a flux of 1.0 mWb? Relative permeability of iron is 500..
- I want to know what temperature the cylinder will have inside. It's a heat transfer problem. current: 31 A voltage 42V Induction coil measurement: It has 1/8” OD and 0.03” wall thickness and will wrap around the cylinder and will have the same height as the cylinder.A DC generator feeds a load of current 20 A and voltage 220 V. Calculate the electrical motive force generated in the armature if it is known that the resistance of the armature is 0.02 Ω and the resistance of the field is 0.01Ω.The voltage induced in a generator is 110 V when the armature rotates at 1100 r/min. What will the voltage be if the speed is increased to 1200 r/min? A generator operating at 1850 r/min develops a voltage of 130 V. What must be the speed of the generator for a voltage of 120 V?
- P KN Refer to the figure. d₁ 0.9 m Force P is 60 kN and each force Q is 125 kN. Q KN Add your answer Integer, decimal, or E notation allowed Q KN The diameter d₁ = 30 mm and diameter d₂ = 50 mm. B d₂ 1.2 m What is the normal stress in rod AB in MPa? Round to the nearest integer and enter the magnitude only. C GiA freight elevator weighing 5000kg is to be lifted 20 meters in 3 minutes. Calculate the horsepower of the motor required to do the job. A magnetic circuit has a flux of .75 Webers. The magnetic force (Fm) applied to the circuit is 550 Amp-turns. What is the reluctance (Rm) of the magnetic circuit? A magnetic circuit with a reluctance (Rm) of 1500 AT/Wb has a flux of 430 mWb. What is the force magnetic (Fm) of this circuit? Hint: Rm = Fm/fluxA P KN Refer to the figure. d₁ 0.9 m Force P is 60 kN and each force Q is 125 kN. Q KN B Add your answer Integer, decimal, or E notation allowed Q KN The diameter d₁ = 30 mm and diameter d₂ = 50 mm. d₂ 1.2 m What is the normal stress in rod BC in MPa? Round to the nearest integer and enter the magnitude only. C