Q/ A 4-pole, 400V, 3-phase, 50Hz induction motor runs at 1440 r.p.m. at 0.8 p.f. lag and delivers an output of 10.8KW. The stator loss is 1060W and friction, windage etc. losses are 300W. Calculate: (i) Slip. (ii) rotor copper loss. (iii) rotor frequency. (iv) line current.
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Q/ A 4-pole, 400V, 3-phase, 50Hz induction motor runs at 1440 r.p.m. at 0.8 p.f. lag and delivers an output of 10.8KW. The stator loss is 1060W and friction, windage etc. losses are 300W. Calculate:
(i) Slip.
(ii) rotor copper loss.
(iii) rotor frequency.
(iv) line current.
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- 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.What is the difference between transformer and 3ph asynchronous motor...A balanced three phase induction motor has an efficiency of 0.85 when its output is 44.76 kW. At this load both the stator copper loss and the rotor copper loss are equal to the core losses. The mechanical losses are one-fourth of the no-load loss. Calculate the slip. [4.94%] (AMIE Sec. B Elect. Machines (E-3) Winter 1991)
- The resistance and reactance per phase of the rotor of a 3-phase induction motor are 0.6 ohm and 5 ohms respectively. The induction motor has a star-connected rotor and when the stator is connected to a supply of normal voltage, the induced e.m.f. between the slip rings at standstill is 80 V. Calculate the current in each phase and the power factor at starting when (i) the slip-rings are shorted, (ii) slip-rings are connected to a star-connected resistance of 4 ohm per phase.8. A 3-phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is ............ (i) 20 W (iii) 500 W (ii) 980 W (iv) 200 WWhat 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.
- B) fill in the blanks: that of rotor MMF. 1)In a 3-phase synchronous motor the speed of stator MMF is ......... 2)The synchronous reactance of the synchronous machine is....... 3) When two transformers are operating in parallel, they will share the load as under...... 4)A synchronous motor is operating on no-load at unity power factor. If the field current is increased, power factor will become..A three-phase, 4-pole, 1,500 rpm alternating having a double layer-windings with 18 turns per coil. The slots per pole per phase are 10 and the coil span is 22 slots. The spread phase is 60 degrees and the flux per pole is 0.0625 Weber. If the armature windings are wye connected. a) Determine the generated voltage per phase and the line to line voltages. b) If the alternator is delivering a three - phase load of 1,200KW at 0.8 lagging power factor what is the line current of the alternatorWhat is use of solenoid coil in the pressure to converter? a. To produce magnetic field in the LVDT b. To change the LVDT output c. To bring back the pivoted beam normal position d. To produce linear displacement in bellows