A 60HP, 230 V shunt motor has a shunt field resistance of 38.3 ohms and an armature resistance of 0.04 ohm. If the resistance in the starter is 0.66 ohm and the brush drop is 3 volts. What is the input current to the motor at the instant it is started?
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A 60HP, 230 V shunt motor has a shunt field resistance of 38.3 ohms and an armature resistance of 0.04 ohm. If the resistance in the starter is 0.66 ohm and the brush drop is 3 volts. What is the input current to the motor at the instant it is started?
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- A 440V 75 hp shunt motor has an armature resistance of 0.185 ohms and a field resistance of 350 ohms. The current drawn at full load is 135A. What is the back emf in volts?A 220 V shunt motor has an armature resistance of 0.4 ohm and field resistance of 140 ohm. The motor draws 6 A at 1600 rpm at no load. Calculate the speed and shaft torque if the motor draws 52 A at rated voltage.A 15-hp 440-volt compound motor has a shunt-field resistance of 293 ohms and takes 28.5 amp at rated load when it operates at 1,150 rpm. What will be the horsepower output of the motor when it's speed is 1070 rpm, under which condition it takes 34.5 amp and the flux is increased by 10 per cent?
- A 25 hp, 240 V, 1800 rpm dc shunt motor draws a full load line current of 89 A, and has an armature resistance of 0.05 Ω, and its field circuit resistance is 120Ω Calculate: to. The armature voltage that must be applied to the motor when it is running with no load at 1800 rpm. b. It powers them when the voltage calculated in a) produces an armature current of 4.2 A, at a speed of 1800 rpm....."A 50 hp, 220 V shunt motor operating at 1200 rpm draws a line current of 94 A when operating at rated conditions. A 1.8 ohm resistor inserted in series with the armature causes the speed to drop to 840 rpm. The respective field circuit resistance and armature circuit resistance are 55 ohm and 0.2 ohm. What will be the new armature current(in Amp)?"A series motor runs at 800 rev/min when the voltage is 400V and the current is 25A. The armature resistance is 0.4 ohm and the series field resistance is 0.2 ohm. Determine the resistance to be connected in series to reduce the speed to 600 rev/min with the same current.
- A 60-hp 230 V shunt motor has a shunt field resistance of 38.3 ohms and an armatureresistance of 0.04 ohm. if the resistance in the starter is 0.66 ohm, calculate the current input to the motor at the instant it is started. (Assume a 3 V brush drop)At100 volts, a shunt motor is taking 250 amperes. Shund field resistance is 20 ohms and armature resistance is 0.02 ohm. The friction and iron losses are 600 watts. What is the b.h.p output and the mechanical efficiency.Determine the value of starting resistance of the 7.5 kW, 220 V shunt motor so thatthe current will not exceed 2 times of the motors full load rating. The armature andfield resistance is 0.24 and 101 ohms respectively. The motor efficiency is 95%
- A 200-V shunt motor is taking a current of 30A. Armature resistance is 0.2 ohm and shunt field resistance is 100 ohms. Iron and friction losses amount of 500W. What is the HP output of the motor3. A 250 V, 20 kW shunt motor running at 1,500 rpm has a maximum efficiency of 85% when delivering 80% of its rated output. The resistance of the shunt field winding is 125 ohms. Determine the efficiency and speed of the motor when its draws 100 A from the mains.assume that a series motor is taking the same current with the conditions that 440v motor takes a 25 a and runs at 800 rpm the armature resistance including the resistance of the series winding is 0.77ohms calculate the speed will it run if a 1.88 resistance is connected in series with the supply voltage