10 kW, 6-pole, 50 Hz, 3- phase induction motor has linear torque-slip characteristicsbetween zero torque and maximum torque. The slip at which maximum torque of 520 Nmoccurs is 0.2. For mechanical losses of 600 W, find the speed at which motor would run whiledelivering rated shaft power.

A 40 kW, 3-phse slip ring induction motor of negligible stator impedance runs at a speed0.96 times synchronous speed at rated torque. The slip at maximum torque is 4 times the fullload value. If the rotor resistance of the motor is is increased by 5 times, determine,(i) The speed, power output and rotor ohmic losses at rated torque(ii) The speed corresponding to maximum torque.Neglect mechanical losses.

A 3-phase, 1.5 kW, 415 V, 2-pole, 50 Hz, 2910 rpm induction motor delivers rated output power to a load. If the rotational loss is 150 W, determine the air-gap power.

A three-phase, 220 V, 50 Hz, induction motor has 6 poles. What is the synchronous speed and the rotor speed of this induction motor when the slip is 0.03?Question 3Answera.Ns = Nr = 1500 rpmb.Ns=1500 rpm and Nr=1455 rpmc.Ns=1000 rpm and Nr=970 rpmd.Ns=1500 rpm and Nr=1000 rpm

A 400 V, 5- Hz, 3-phase delta connected, 6-pole induction motor has following standstillleakage impedances per phase referred to stator:z1 = 1.2 + 2.1j ohm , Z2 =1.32 + 2.2j ohm.Neglecting magnetizing impedance, determine(a) gross output power at a slip of 0.04,(b) thechange in line current when the stator terminals are switched from star to delta at a slip of0.4,(c) the resistance to be added in each rotor phase to obtain a starting torque of 350 Nm

A 50 hp, 240 V, 4 poles, 60 Hz, Delta connected, three phase induction motor, ifR 1 =0,4 ohm, R’ 2 =0,6 ohm, X 1 =1,0 ohm, X’ 2 =1,0 ohm, n s =1800 and n=1710.Find the following quantities:a) I 1 =I’ 2 =?b) t=?c) I st =?d) t st =?e) t max =?f) S max =?g) Sketch thetorque-speedcharacteristic