The starting torque of a 25-hp 720-rpm synchronous motor is 150 per cent of its rated torque. Calculate the starting torque in pound-feet,
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- On the nameplate of a star-ring induction motor: 75 kW, 16 A, 380V, 1430 rpm. It is written coso-0.82 and f-50 Hz. If the ratio between Tipping (Maximum torque) and Rated torque of the motor is 2.2, find the overturn slip (Slip where the maximum torque occurs).A 50HP, 440V, three-phase, 60-Hz squirrel cage induction motor is operating at full-load with 0.8 lagging power factor. The full-load effieciency is 85% and the percentage slip is 5%. Determine the full-load torque of the motor.3. The slip-ring rotor resistance and standstill reactance per phase of a 3300 V, 24-pole, 50 Hz, 3-phase star-connected induction motor are 0.02 ohm and 0.3 ohm respectively. Calculate the (a) speed at maximum torque (b) ratio of full load torque to maximum torque if the full load speed is 246 rpm
- A four-pole, three-phase induction motor drives a turbine load. At a certain operatingpoint the machine has 4 percent slip and 87 percent efficiency. The motor drives aturbine with torque–speed characteristic given by TL = 20 + 0.006ω2,where TL is theload torque at the shaft. Determine:(1) the torque at the motor-turbine shaft.(2) the total power delivered to the turbine.(3) the total power consumed by the motor.An 8-pole, 50 Hz induction motor has a full load slip of 2.5 percent and amaximum torque of twice the full-load torque. At what value of slip does themaximum torque occur?In a 4-pole, 50 Hz single-phase Induction motor, the power absorbed by the forward and backward field rotor equivalent resistances are 200 W and 21W respectively at a motor speed of 1440 rpm. The mechanical losses totals 20W. Compute the shaft torque at the above speed.
- A 4-pole, 3-phase, 50Hz induction motor has a voltage between slip-rings on open circuit of 520V. The star connected rotor has a standstill reactance and resistance of 2.0 and 0.4 Ω per phase respectively. Determine: (a) The full-load torque if full load speed is 1,425 rpm(b) The ratio of starting torque to full-load torque(c) The additional rotor resistance required to give maximum torque at standstill.The starting current of a 3-phase squirrel-cage induction motor with 60 kW, 380 V, 120 A, 2900 rpm, coso = 0.78 written on the plate is 10 times the rated (full load) current and the overturning torque is 2 times the rated torque. It is known that the starting moment is 1.5 times the rated torque. If a voltage higher than 20% of the nominal value is applied to the motor, find the overturning torque (M2d) (torque) of the motor. Find the efficiency (u(full load)) and the reactive power drawn from the mains (Q(full load)) for the motor operating at rated load and nominal voltage.M2d=u(full load)=Q(full load)=A75 hp, 3-phase, 6-pole, 60 Hz induction motor delivers full load torque at 5% slip. If the load torque is increased by 15% as allowed by the service factor on the nameplate, determine the new speed and horsepower delivered
- 6. A 15 HP, 4 pole, 220 volts three phase star connected, 1725 rpm induction motor has the following parameters: R1 = 0.15 Ω, R2 = 0.18 Ω, X1 = 0.31 Ω and X2 = 0.31 Ω, friction and windage loss = 240 watts. Determine (i) Slip at maximum torque and maximum torque in synchronous torque (ii) slip at maximum power and maximum power (iii) starting torque and starting current.A 10Hp, 550V, 60Hz, 3-phase induction motor has a starting torque of160% of full load torque and a starting current of 425% of full loadcurrent. If the motor is used on a 440V, 60Hz system, what will be thestarting torque expressed in percent of its full load value?An 18 kW, 4 Pole 50 Hz, three phase induction motor has friction and windage losses as 2.5 % of the output power. The full- load slip is 4%. Compute for full- load the rotor copper losses, the shaft torque and developed torque.