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- The nameplate speed of a 25-Hz inductionmotor is 720 r/min. If the speed at no load is 745r/min, calculatea. The slip.b. The percent regulation.At no load, a 250V shunt motor runs at 1000 rpm and draws 8A. Armature and field resistances are 0.20 ohm and 250 ohms, respectively. If the motor draws a current of 50A, its speed will beA 220V dc shunt motor takes 4A at no load and runs at 700 rpm. Ra = 0.60 ohm and Rsh = 110 ohms. What is the efficiency of the motor when the motor input is 8800 W? a. 81.67% b. 80.2% c. 82.05% d. 79.44%
- Write the solution neatly. A 230 V d.c. shunt motor, having an armature resistance of 0.05 ohm and a fieldresistance of 75 ohms, draws a line current of 7 A while running light at 1120 rpm. Determine the motor efficiency when the line current at a given load is 46 A. Answer % = 83.92 %Appliances in home that use DC motor and briefly explain why it works as reverse DC generatorThe efficiency of 100 kW, 600V, 3 phase synchronous motor is 90%. When the pf is 0.9 leading, what is the armature current?
- 10.a. An auxiliary motor is driving a synchronous alternator to determine its efficiency. When the test is madewithout field excitation, the data sheet shows the motor input to be 65 kw and the motor losses to be 30kw. The friction and windage losses of the alternator areA. 30 kw.B. 35 kw.C. 65 kw.D. 95 kw.10.b. In a d-c machine, which one of the following losses is a no-load loss?A. Ventilating lossB. Stray-load lossC. I²R lossD. Core lossA 220V shunt motor draws 64A and runs at 500 rpm. Ra = 0.25 ohm, Rsh = 55 ohms. Determine the speed of the motor when a resistor of 20 ohms is inserted in the shunt field circuit and the load torque remains the same.In a 50kVA star connected 440 V, Three phase, 60Hz alternator, the effective armature resistance is 0.25 ohm per phase, what is the percentage regulation on full load?
- Determine the minimum current for conductors required to connect a motor that has a full-load current of 46 A.A 220v shunt generator has an armature resistance of 0.02 ohm and a shunt resistance of 44 ohms. At rated load, the driving engine develops 62.25 hp. If the iron and friction losses amount to 1600w. What is the electrical efficiency?A 10 Hp 220 V shunt motor takes a current of 3A when running light. Calculate the maximum efficiency as the motor when delivering full loadoutput if the armature and field resistances are 0.5 ohm and 250 ohmsrespectively.