Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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A three-phase induction motor used for a commercial application in Oman 50HZ runs at 584 rpm at no load and at 546 rpm at full load.
a) How many poles do this motor have?
b) What is the percentage slip at full load?
c) The frequency of the rotor currents when slip is 7 %
d) The frequency of the rotor currents at standstill.
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- A 3-phase, 60 Hz induction motor has 2 poles. If the slip is 2% at a certain load, determine the synchronous speed and the speed of the rotor and the frequency of the induced e.m.f.’s in the rotorarrow_forward22. A) Why is the power factor of a lightly loaded 3-phase squirrel-cage induction motor very low? a) most of the power supplied to the motor at light loads is magnetization or inductive power b) most of the power supplied to the motor at light loads is resistive power c) most of the power supplied to the motor at light loads is capacitive power d) none of the above B) What happens to the power factor as load is increased on the motor? a) the power factor increases b) the power factor deceases c) remains the samearrow_forwardA certain 60Hz, four-pole split-phase induction motor spins at 1760rpm when running with no torque load. Find its slip at no load. A. 1800rpm C. 1150rpmB. 90rpm D. 40rpmarrow_forward
- A three-phase induction motor used for a commercial application in Oman runs at 580 rpm at no load and at 552 rpm at full load. a) How many poles do this motor have? b) What is the percentage slip at full load? c) The frequency of the rotor currents when slip is 5 % d) The frequency of the rotor currents at standstill. a) b) c) d)arrow_forwardDiscuss the behaviour of an induction motor when it is rotating at synchronous speed.arrow_forwardA 6-pole, 3-phase, 50 Hz induction motor develops a maximum torque of 30 Nm at 960 r.p.m. Determine the torque exerted by the motor at 5% slip. The rotor resistance per phase is 0.6ohm.arrow_forward
- 22. A) Why is the power factor of a lightly loaded 3-phase squirrel-cage induction motor very low? a) most of the power supplied to the motor at light loads is magnetization or inductive power b) most of the power supplied to the motor at light loads is resistive power c) most of the power supplied to the motor at light loads is capacitive power d) none of the above B) What happens to the power factor as load is increased on the motor? a) the power factor increases b) the power factor deceases c) remains the samearrow_forwardA 3-phase, 60 Hz induction motor has two poles. If the slip is 2% at a certain load, determine the synchronous speed, the speed of the rotor and the frequency of the induced e.m.f.'s in the rotor.arrow_forward3. A 440V 60-hp six pole 60 hz A connected induction motor has the following parameters R1=0.048 R2= 0.035 Xm= 9.50 X1= 0.33 0 X2= 0.37 0 Pcore= 600W PF&W= 350W Use the Thevenin's Equivalent circuit concept to find: (a)Vth and Zth seen by the rotor circuit (b)The slip at which maximum torque occurs (c) the value of Max/pullout Torques (d) The starting torque.arrow_forward
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