i-ii-iii-iv-For synchronous machines :-Explain briefly the methods of starting the synchronous motors?State the conditions for a satisfactory parallel operation of synchronous generators?Discuss will there be a torque developed by unexcited synchronous motor if the rotor iscylindrical type or salient pole type ?Draw the phasor diagram for both cylindrical type and salient pole type synchronous generators?

Question i: Methods of Starting Synchronous MotorsSynchronous motors cannot start by themselves…

Answered: i- ii- iii- iv- For synchronous…

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter35: Harmonics 916

Section: Chapter Questions

Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...

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Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and 1800 rpm. Each winding has an armature resistance of 0.05Q and a synchronous reactance of 0.6Q. Draw the phasor diagram with values, show torque angle and determine the induced voltage for the condition of rated load.
3
A three-phase, 1 MVA, 2.3 kV, 60 Hz, star-connected, salient pole synchronous generator has the d- and q-axis synchronous reactances are 1.1 and 0.8 Q respectively. Its armature has a resistance of 0.15 §. The machine is operating at full load at a power factor of 0.8 lagging. Determine the excitation voltage Ę and draw the generator phasor diagram using actual values.
Please answer and show the solution completely.
Single phase induction motor performance characteristics 6. Explain double revolving field theory.
hele Ish 0.05 50 A To R 30 A
Question #3 An eight-pole, 25-kW, 120-V DC generator has a duplex lap wound armature which has 64 coils with 16 turns per coil. Its rated speed is 2400 r/min. a. How much flux per pole is required to produce the rated voltage in this generator at no-load conditions? b. What is the current per path in the armature of this generator at the rated load? c. What is the induced torque in this machine at the rated load? d. How many brushes must this motor have? How wide must each one be? e. If the resistance of this winding is 0.011 Q per turn, what is the armature resistance RA of this machine?
L-1). How would it be possible to reverse the direction of rotation of a 3-phase synchronous motor? a) reverse the polarity of the DC field excitation b) interchanging any two of the incoming supply lines c) interchanging all three of the supply lines d) none of the above L-2). The amortisseur winding of a 3-phase, synchronous motor is the.....a) squirrel-cage winding on the rotor used to start the motor b) wire wound winding on the rotor to be connected to the external DC supply by way of slip rings and brushes c) either "a" or "b" d) neither "a" nor "b" L-3). Is it ok to have the DC voltage supply connected to the rotor of a 3-phase synchronous motor while starting? a) yes b) no
An eight-pole, 25-kW, 120-V DC generator has a duplex lap-wound armature, which has 64 coils with 16 turns per coil. Its rated speed is 2400 r/min. (a) How much flux per pole is required to produce the rated voltage in this generator at no-load conditions? (b) What is the current per path in the armature of this generator at the rated load? (c) What is the induced torque in this machine at the rated load? |(d) How many brushes must this motor have? How wide must each one be? (e) If the resistance of this winding is 0.011 2 per turn, what is the armature resistance R of this machine?
What are typical applications of synchronous motors?
Please answer question 2
A 3 phase 10 kVA, 400 V star connected, 4 pole synchronous generator has a synchronous reactance per phase of 2 Ohms. The armature resistance is neglected. Define: a) the rotational speed of the generator to produce an output frequency of 60 Hz b) generator voltage regulation at full load and a load factor of 0.8 lagging.

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