#Garrard zero 100 will not stay on full
The approximate average no load steady state speed when this motor is connected to 400 V, 50 Hz supply isġ11.I f a three phase slip ring induction motor is fed from the rotor side with starter winding short circuited, then frequency of the current flowing in the short circuited starter isġ12.In an induction motor, if air gap is increased, thenġ13.An induction motor having full load torque of 60 Nm when delta-connected develops a starting torque of 120 Nm. If starter losses are 1 Kw and friction and windage losses total 2 kW, then efficiency of the motor isġ10.The rotor of a three phase, 5 kW, 400 V, 50 Hz, slip ring induction motor is wound for 6 poles while its starter is wound for 4 poles. Which of the following will be the value or slip of the motor if it develops same torque theoretically while operating at 110 percent of its normal voltage?ġ09.The power input to a 415 V, 50 Hz, 6 pole, 3-phase induction motor running at 975 rpm is 40 kW. Learn More: Why 25kV is used in Railway Traction Systemġ08.A 3-phase induction motor has a full-load slip of 3 percent at normal voltage.
#Garrard zero 100 will not stay on series
Neglecting starter impedance, for developing maximum torque, the external resistance to be connected in series with each rotor phase will be a) for core loss and windage and friction lossĬ)for copper loss and windage and friction lossĪnswer: for core loss and windage and friction lossġ06.If rotor power output of 3-phase induction motor is 15 kW, then rotor copper losses at a slip of 4% will beġ07.A 6-pole, 3-phase,60 Hz induction motor runs at 1000 rpm developing maximum torque.a) relative velocity between starter field and rotor conductorĪnswer: relative velocity between starter field and rotor conductorġ04.The shunt resistance circuit component obtained by no-load test of an induction motor is representation ofĬ)core loss and windage and friction lossĪnswer: core loss and windage and friction lossġ05.During no-load test, an induction motor draws power.If rotor is driven by an external means at 1000 rpm opposite to then direction of starter field, the frequency of voltage across a slip-rings will beġ03.Emf induced in the rotor of a 3-phase induction motor is proportional to the b) parasitic torque and noise but increases starting torqueĬ)noise but increases pull-out torque and parasitic torqueĭ)parasitic torque, noise pull-out torque and starting torqueĪnswer: parasitic torque, noise pull-out torque and starting torqueġ02.A 6-pole,50Hz wound rotor induction motor when supplied at the rated voltage and frequency with slip-ring open-circuited, developed a voltage of 100 V between any two rings.a) parasitic torque and noise but increases pull-out torque.101.In a 3-phase squirrel cage induction motor, skewing of rotor slots reduces