Choose the correct answer/s.a) Which of the given losses is directly proportional to the square of speed?1. Windage Loss, 2. Eddy's current Loss, 3. Both Windage and eddy's current loss, 4. Hysteresisloss and brush loss.....b) Maximum power will be developed when back emf is1. Equals to supply voltage, 2. Half to supply voltage, 3. Doubles to supply voltage, 4. Alloptions are correctc) No-load saturation characteristics are plotted between1. No-load voltage and field current, 2. No-load voltage and armature current, 3. Short circuitcurrent and field current, 4. Short circuit current and armature currentd) The current flowing in the conductors of a DC motor is .....1. D.C, 2. A.C, 3. D.C as well as A.C, 4. Transientse) The speed of a DC shunt motor is required to be more than Full Load speed. This ispossible by1. Increasing the armature current, 2. Decreasing the armature current, 3. Increasing theexcitation current, 4. Reducing the field's currentf) A simple method of increasing the voltage of a DC generator is to .....1. decrease the air gap flux density, 2. increase the speed of rotation, 3. decrease the speedof rotation, 4. increase the length of the armatureg) The direction of rotation of a DC shunt motor is reversed by1. reversing armature connections, 2. interchanging the armature or field connection, 3.adding resistance to the field circuit, 4. reversing supply connectionsh) If the current in the armature of the DC series motor is reduced by 5%, the torque ofthe motor will become .....1. 50% of the previous value, 2. (25%) of the previous value, 3. (90.25) % of the previousvalue, 4. (125%) of the previous valuei) Fleming's left-hand rule applies to.....1. DC generator, 2. DC motor, 3. alternator, 4. transformerj) The field control of a DC shunt motor gives ..... drive.****.1. constant torque, 2. constant kW, 3. constant speed, 4. variable load speedk) Which of the following motor has a high starting torque?1.Synchronous motor, 2. DC shunts motor, 3. All options are incorrect, 4. DC series motor1) Poles of d.c machines are often laminated to reduce ....1. eddy current loss, 2. iron weight, 3. armature reaction, 4. hysteresis lossm) When the number of poles and number of armature conductors is fixed in the D.Cgenerator then which winding will give higher emf?1. Wave Winding, 2. Lap Winding, 3. Either Lap or Wave Winding, 4. Depend upon theconductorn) The efficiency of the DC motor at maximum power is .....1. 90%, 2. 100%, 3. Around 80%, 4. Less than 50%o) If the supply polarity to the armature terminal of a separately excited d.c.motor isreversed, the motor will run under... condition.1 dynamic braking, 2. regenerative braking, 3. plugging, 4. normal motoring

Answered: Image /qna-images/answer/34083ef1-4695-4a24-be6f-a2f052dee3be.jpg

Choose the correct answer/s. a) Which of the given losses is directly proportional to the square of speed? 1. Windage Loss, 2. Eddy's current Loss, 3. Both Windage and eddy's current loss, 4. Hysteresis loss and brush loss SLLL b) Maximum power will be developed when back emf is 1. Equals to supply voltage, 2. Half to supply voltage, 3. Doubles to supply voltage, 4. All options are correct c) No-load saturation characteristics are plotted between 1. No-load voltage and field current, 2. No-load voltage and armature current, 3. Short circuit current and field current, 4. Short circuit current and armature current tor ic

Choose the correct answer/s. a) Which of the given losses is directly proportional to the square of speed? 1. Windage Loss, 2. Eddy's current Loss, 3. Both Windage and eddy's current loss, 4. Hysteresis loss and brush loss SLLL b) Maximum power will be developed when back emf is 1. Equals to supply voltage, 2. Half to supply voltage, 3. Doubles to supply voltage, 4. All options are correct c) No-load saturation characteristics are plotted between 1. No-load voltage and field current, 2. No-load voltage and armature current, 3. Short circuit current and field current, 4. Short circuit current and armature current tor ic

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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