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// A Texbook on POWER SYSTEM ENGINEERING
// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
// DHANPAT RAI & Co.
// SECOND EDITION
// PART IV : UTILIZATION AND TRACTION
// CHAPTER 1: INDUSTRIAL APPLICATIONS OF ELECTRIC MOTORS
// EXAMPLE : 1.20 :
// Page number 702
clear ; clc ; close ; // Clear the work space and console
funcprot(0)
// Given data
V = 500.0 // Shunt motor voltage(V)
load = 400.0 // Hoist load(kg)
speed = 2.5 // Hoist raised speed(m/sec)
n_motor = 0.85 // Efficiency of motor
n_hoist = 0.75 // Efficiency of hoist
// Calculations
P_output = load*speed*9.81 // Power output from motor(W)
P_input = P_output/(n_motor*n_hoist) // Motor input(W)
I = P_input/V // Current drawn from supply(A)
output_G = load*speed*9.81*n_motor*n_hoist // Generator output(W)
R = V**2/output_G // Resistance required in the armature circuit for rheostatic braking(ohm)
// Results
disp("PART IV - EXAMPLE : 1.20 : SOLUTION :-")
printf("\nCurrent drawn by the motor from supply = %.1f A", I)
printf("\nResistance required in the armature circuit for rheostatic braking, R = %.f ohm", R)
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