A 4-pole induction motor supplied from 50 Hz line has a 5% slip while supplying 10 kW power to a load. What is the rotor speed, wm? What is the torque, t, produced by the motor? If the load reduces to 5 kW, what will be the new rotor sip, Snew and the new torque, new, produced by the motor? (approximately)
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- What are the various losses in an induction motor? On what factors do they depend? IV. V. List the different types of stray load losses in an induction motor.The concepts a 3 phase squirrel-cage induction motors (SCIM). 3 phase motors are widely used in the industry. they require little maintenance, having no brush gear or centrifugal switch, are robust and relatively inexpensive.The efficiency of 3-ph induction motor. at (Is=4.5A, T=13 N.m, N=1333 rpm, Pph=864 watt ) is
- 200 +21. If maximum torque of an induction motor is kg-m at a slip of 12%, the torque at 6% slip would be...... kg-m. 1 (a) 100 (b) 160 (c) 50 (d) 40 B, 1993)Choose True (V) or false( x) for the following : 4) Reluctance is a measure of "opposition" the magnetic circuit offers to the flux. 5) The rated output power (transformer rating) can be used to determine the turns ratio of the transformer. 6) With the increase in speed of a series DC motor, Both back emf as well as line current increase. 7) When an induction motor is stationary, the stator and rotor windings form the equivalent of a transformer. 8) Increasing the load current for DC Self-excited generator Shunt-Wound Generator will increase the terminal voltage. 9) In lap windings there are as many paths in parallel and used to produce high current, low voltage output. 10) In 3-pahse induction motor, if the rotor speed increases, the rate at which the rotating magnetic field cuts the rotor bars is increasing.A three-phase induction motor has: n-1500 rpm, nm-1440 rpm, the input power of the motor is Pin = 37.5 kW, if the no-load losses (i.e. stator core losses Pscl & core losses Pa) are equal 1.5 kW. Then the rotor core losses is: 1.44 [kW] 1.50 [kW] 3.56 [kW] 4.56 [kW]
- • Q5/ in a DC motor. List and describe the types of losses that occurA value of magnetizing current in a 3-phase induction motor * gives power factor smaller .. larger smaller. .poor large . better O large...poor OAn induction motor having full load torque of 60 Nm when delta-connected develops a starting torque of 120 Nm. For the same supply voltage, if motor is changed to star -connection, then starting torque developed will be Nm.
- a) The figure below shows the per-phase equivalent circuit of a two- pole three-phase induction motor operating at 50 Hz. The voltage (E1) across the magnetizing inductance is 210 V, and the slip (s) is 0.05. What is the developed torque produced by the motor ? 0.04 0 j0.22 0 j0.22 0 0.05 V j6.28 NE E1a) The figure below shows the per-phase equivalent circuit of a two- pole three-phase induction motor operating at 50 Hz. The voltage (E1) across the magnetizing inductance is 210 V, and the slip (s) is 0.05. What is the developed torque produced by the motor ? 0.04 n j0.22 0 j0.22 0 j6.28 N E1 0.05 0Two identical 2,000 kW alternator operates in parallel. The governor of the first machine is such that the frequency drops uniformly from 50 Hz at no-load to 48 Hz at full-load. The corresponding uniform speed drop of the second machine is 50 Hz to 47.5 Hz. What is the maximum load that can be delivered without overloading either machine?