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WW ' ﬂay/mea/rugtes Test 2 Novern'oer 20, 2000 _ .. BE 38! Ni [p- O , 3.3!! .‘i’ Fall 2000 i . t - ‘ -
l. A 10 HIE-440 V, 60 Hz, 4—pole, 3-phase induction-motor is designed to run at a slip of0,03 at full load. The rotational loss is 4% of the output power. Calculate the
following under full load conditions: (a) Nmpg‘ (b) Pd (c) P“ (d) PRC}. and (e) Tenn. . A 3-phase. 60 Hz. 4-pole, Y-connected induction inotor has 72 slots and carries a double layer winding. Each coil has 4 turns and is full pitch. If the ﬂux per pole is
0.015 weber, ﬁnd the induced voltage per phase in the stator winding. . . The input to the ROTOR ofa 2200 v, 3-phase, 60 Hz, 12-poie induction motor is
- 242,00Q_watts and the rotor current per phase is 375 A. If the resistance of the rotor is 0.0175 ohm-per phase, what is the Speed and the horsepower output of the motor if
the ROTAHONAL LOSSES ARE NEGLECTED. I A 4-pole, 3-phase, wound rotor induction motor has R. = 02 ohm and X, = 2‘ohn1' per
phase. NEGLECTING'STATOR IMPEDANCE, determine the value of the per
phase external resistance needed in the rotor circuit suc that the rotor develops the same torque at s = 0.2 as at s = 0.05. Assume a Sin-gig}: p or ode vs. s with a slope of I'ldﬂﬂx . i! . Show-n 11?.an is. n nirrtnit fr)!- g'tgﬁinn n ”Lu-amen :uAum-:nn "3:3:- _ _. run—um- _m-—v-evu n...- a} What is the name of this starting method?
‘0) Draw the complete circuit showing the supply lines and the motor connections.
c) Describe the sequence of events involved in the starting process. Thrce— phase
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