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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- I need the answer quicklyQ2) An energymeter is designed to make 100 revolutions of disc for one-unit energy. Calculate the number of revolutions made by it when connected to load carrying 20 A at 230 V and 0.4 p.f. for two hours. If it actually makes 360 revolutions, find the percentage error? Comment?A 255 V, DC lathe machine, (not a 2 pole machine) has armature resistance and series resistance are 0.150 and 1702 respectively. The motor has 25mWb flux per pole. The ratio of pole to parallel paths is unity. The product of this ratio and number of turns in armature section is 1000. When it runs light, it has a speed of 1200 rpm. If it runs at maximum load, it takes a current of 70A. (1) Which machine is this one, shunt or series ? Is machine lap wound or wave wound? (3) Calculate the no load back EMF. (4) Calculate the no load armature current. (5) Calculate the no load shunt current. (6) Calculate the current drawn by the machine. Calculate the variable losses on load. (8) Calculate the armature power when it runs light. (9) Calculate the stray losses when it runs light. (10) Calculate the full load armature current. (11) (12) (13) Calculate the full load back EMF. Calculate the Variable losses on maximum possible load. Calculate the armature power on maximum load. (14) Calculate…
- Select the correct answer for each of the following statements Book Source: Electricity 3 | 10th Edition ISBN-13:9781111646738 ISBN:1111646732 Authors:Jeffrey J. KeljikQuestion#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)?Iron losses in a DC machines are independent of variations in: * voltage and current speed and current current voltage speed load speed and voltage
- 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 linear machine has the following parameters: The battery voltage, V = 120 V, The internal resistance of the battery R = 0.4 02, The length of the bar is1 meter, and the magnetic flux density B = 0.5 T (out of the page). What is the no load steady-state speed of the bar at starting? 1=0 R www O a. Speed VSS = 240 m/s to the right O b. Speed Vs = 240 m/s to the left O c. Speed Vss = 48 m/s to the right O d. None e. Speed Vss = 48 m/s to the left B 1a 3phase,4-pole,24slots alternator has its armature oil shot pitch by one slot. its pitch factor will be? Subject: Electrical machine 2
- : The force that generates a flow of electricity is sometimes called Pressure O Conductor O Velocity E. Most circuit are protected by Fuses Source D Load . In the flow of electrons moves steadily in one direction. O Direct current O Alternating currentPLEASE DO EVERYTHING IN TYPEWRITTEN FOR UPVOTES. NO UPVOTE IF YOU DIDN'T FOLLOW MY INSTRUCTION. THANK YOUQUESTION FIVE Figure 5 shows the cross section of Direct Current, mostly referred to as DC Machine. 1 2 NBA D 7 N S 3 5 8 Frame Figure 2 Cross Section of a DC machine Label All the numbered parts and define one of their respective function in the format as illustrated: Label 8: Frame Function: It completes a path of minimal reluctance to the magnetic field.