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Electric Motor Control

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter51: Electric And Electronic Braking

Section: Chapter Questions

Problem 1SQ

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In plugging type of braking system of DC motor, the current in the series and shunt fields must not be reversed" True False

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Q1 • The D.C shunt generators consist of two parts, • The conditions for voltage build-up in D.C shunt generator are • The • Can be controlled the speed of de shunt motor, by changing ------- at constant and- and --- must be constant throughout the test of no load D.C shunt generator. -----------
The speed regulation of DC series motor is lesser than the DC shunt motor True False
N1. Weakening of the magnetic field of a DC shunt motor, by adding resistance in series with the field, could result in an overspeed condition. a) true b) false N2. A shunt field relay is designed to_________.a) shut down power to the shunt field circuit of a DC motor if the voltage gets to high b) increase the resistance of the shunt field circuit during an overload condition c) disconnect the armature from the power supply if the current in the shunt field circuit gets to high d) none of the above N3- 18,650 watts equals_________ horsepower. a) 9 b) 17 c) 25 d) none of the above
In a variable reluctance motor, if the salient poles are 15° apart and the rotor poles are 20° apart, the step angle is ____ degrees.
B-Discuss the purposes of damper bars in synchronous machines? Q4: A- For synchronous machines :- i- Explain what are the advantages of star connection over delta connection for stator windings of synchronous generator? ii- State the advantages of parallel operation of synchronous generators? iii- Define synchronous condenser?
6 Multiple Choice 10 points Use the measured characteristics given in the figure. From the curves shown, this is 220V Start 160V Start 190V Start, DC series motor DC shunt motor DC separately excited motor DC series generator 160V Start 220V Start 190V Start
Please answer Question 5-4 ONLY!
a capacitor for a capacitor-start copacitor-run motor is connected in _____ with the windings to provide a continuous leading current in the start windings.
A -1). Which of the following single-phase split-phase motors has the better starting torque? a) resistance-start induction-run b) capacitor-start induction-run c) both "a" and "b" have the starting torque d) neither "a" nor "b" A-2). Single-phase split-phase motors using an electrolytic capacitor in the start winding circuit should not be cycled more than about__________ time per hour. a) 8 b) 12 c) 24 d) none of the above A-3). When replacing the capacitor in a capacitor-start induction-run motor, one must be sure to replace the bad capacitor with __________ . ti a) a smaller one b) one of the same size c) a larger one d) none of the above
1) Does the excitation affect the synchronous motor speed? 2) Does the excitation affect the power factor ?How? 3) Define following with one sentence each: Under-excitation : Over-excitation :
Short answer please please please please...
Three phase induction motor Leakage Reactance five times Resistance for stator and rotor and impedance for stator and rotor is equal. Slip at full load is 0.02 .calculate the resistance that added for starting current equal three times full load current, Calculate starting torque in this case. if the slip ring is short circuited calculate the ratio of starting current in two cases ..no. of poles is 4 and frequency is 50 Hz

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