4) A synchronous machine has its field winding on the rotor and polyphaser armature winding on the stator. When running under steady state conditions, its air gap field is b) Rotating at synchronous speed Ns with respect C) Rotating at double the Ns with respect to rotor a) Stationary with respect to stator to stator d) Stationary with respect to rotor e) Rotating at ns in the direction of rotor rotation f) answer b,d,e g)answer c,d,e 5) An electric machine is considered as synchronous machine only if a) Stator flux, rotor speed, stator current frequency have invariant relationship during machine operation c) All of the above b) The rotor speed is equal to stator produced flux speed d) Stator current frequency is equal to rotating flux frequency 6) The losses in a synchronous machine a) Mechanical loss b) All of theses c) stray loss d) Iron loss e) Copper loss 7) A three-phase, 250 hp, 2300 V, 60 Hz, Y-connected non salient rotor synchronous motor has asynchronous reartance of 11 ohms per phase. When it draws 165.8 kw, the power angle is 15electrical degrees. Neglect ahmic losses, power factor is a) 0.8 lagging b) None of these c) 0.77 lagging d) 0.77 leading

4) A synchronous machine has its field winding on the rotor and polyphaser armature winding on the stator. When running under steady state conditions, its air gap field is b) Rotating at synchronous speed Ns with respect C) Rotating at double the Ns with respect to rotor a) Stationary with respect to stator to stator d) Stationary with respect to rotor e) Rotating at ns in the direction of rotor rotation f) answer b,d,e g)answer c,d,e 5) An electric machine is considered as synchronous machine only if a) Stator flux, rotor speed, stator current frequency have invariant relationship during machine operation c) All of the above b) The rotor speed is equal to stator produced flux speed d) Stator current frequency is equal to rotating flux frequency 6) The losses in a synchronous machine a) Mechanical loss b) All of theses c) stray loss d) Iron loss e) Copper loss 7) A three-phase, 250 hp, 2300 V, 60 Hz, Y-connected non salient rotor synchronous motor has asynchronous reartance of 11 ohms per phase. When it draws 165.8 kw, the power angle is 15electrical degrees. Neglect ahmic losses, power factor is a) 0.8 lagging b) None of these c) 0.77 lagging d) 0.77 leading

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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