Q18 The synchronous motor is made self-starting by providing a special winding on the rotor poles, known as damper winding or squirrel cage winding. AC supply given to the stator produces a rotating magnetic field which causes the rotor to rotate.
I appreciate your keen observation Kapil. This question was not deliberately gone into the depth of direct axis and quadrature axis reactance. We are not considering the effect of V²/2 * (Xd-Xq)/(Xd*Xq) *sin2δ here so if we put δ=90 which gives sin90 nearly to 1 so does we get maximum power. I hope you understood it.
@@ElectricalEngineeringMCQs you have to keep this in consideration because you have explained that synchronous motor has Salient pole rotor which is partially correct because it also has cylinderical rotor which is used in thermal power plant. Coming back to maximum power quadrature axis reactance can't be ignored in salient pole rotor. It can be ignored in cylinderical rotor which you have neglected in very first question.
@@kapilmatoria3894 Indeed, I will consider this in next sessions so to have better clarity. I appreciate your kind explanation. Moreover, you may have observed that salient pole synchronous machines are more stable than the cylindrical rotor because Xd the direct axis reactance is lower than Xq (quadrature axis reactance) hence rotor remains more stable(in elect. power supply), compare to round rotor where Xd=Xq. Even maximum power transfer(Pm) occurs at a torque angle delta less than 90 degrees. Yet for high speed elect. power generators, round rotor are used, as are the more stable mechanical point of view. I have considered some of these points and came up with this conclusion, and considering the mcqs which I have explained from the synchronous chapter are the questions which have been generally asked in the examination. I hope you understood the same Kapil. Stay tuned.
I appreciate your keen observation salman and thank you for your kind correction. The explained curve has been blurred out to avoid confusion and corrected figure will be uploaded in the pdf as well. Stay tuned and DO share.
Sir what is the power developed by a synchronous motor.... According to u if we put 0 degree as torque angle in thr फार्मूला v*eb/xs **sin§ if we put del is equal to 0 then the power developed is 0 M i right sir or not??
How's 90 degree... Torque angle is the angle between rotor and stator. while no load the angle between this two is 0... Bcoz they are coincide each other... Dont confused its very simple to think
Thank you for your response Satyam I will crosscheck and rectify if any and same will be updated in the PDF as well DO Share this session with your friends.
Q18 The synchronous motor is made self-starting by providing a special winding on the rotor poles, known as damper winding or squirrel cage winding. AC supply given to the stator produces a rotating magnetic field which causes the rotor to rotate.
Superb sir,thank you for your efforts for us.
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Sir in case of question 14 there are 2 options of 90 degrees...and aisa exam me bhi hota hai to ham konsa select kare...?
I will cover the same question with detailed answer for more clarity.
Bahth hii zaberdast sir ..I improved alot from ur lectures ..Salam from pakistan
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In question 23 if excitation get cutoff it will run as reluctant motor if generated electromagnetic torque is more than load torque...
Non salient pole is also known as cylindrical rotor type of synchronou motor
Smooth cylinderical rotor
Sir continuous video
Super sir
Stay tuned Sathish and DO share.
Questions no 12 synchronous motor run at unity pf
Q1
Ans:-Two types of rotor are used in synchronous motor
Power developed is maximum when load angle is 45 .. P = EV/Xd * sinδ + V²/2 * (Xd-Xq)/(Xd*Xq) *sin2δ
I appreciate your keen observation Kapil. This question was not deliberately gone into the depth of direct axis and quadrature axis reactance. We are not considering the effect of V²/2 * (Xd-Xq)/(Xd*Xq) *sin2δ here so if we put δ=90 which gives sin90 nearly to 1 so does we get maximum power. I hope you understood it.
@@ElectricalEngineeringMCQs you have to keep this in consideration because you have explained that synchronous motor has Salient pole rotor which is partially correct because it also has cylinderical rotor which is used in thermal power plant.
Coming back to maximum power quadrature axis reactance can't be ignored in salient pole rotor. It can be ignored in cylinderical rotor which you have neglected in very first question.
@@kapilmatoria3894 Indeed, I will consider this in next sessions so to have better clarity. I appreciate your kind explanation. Moreover, you may have observed that salient pole synchronous machines are more stable than the cylindrical rotor because Xd the direct axis reactance is lower than Xq (quadrature axis reactance) hence rotor remains more stable(in elect. power supply), compare to round rotor where Xd=Xq. Even maximum power transfer(Pm) occurs at a torque angle delta less than 90 degrees. Yet for high speed elect. power generators, round rotor are used, as are the more stable mechanical point of view. I have considered some of these points and came up with this conclusion, and considering the mcqs which I have explained from the synchronous chapter are the questions which have been generally asked in the examination. I hope you understood the same Kapil. Stay tuned.
In question 28 synchronous motor operating power factor .8 leading ..
Superb
West Bengal PSC JE ka session kara doo sir
Great….
Please provide mcqs on power quality issues for MPSC MES MAINS exam.
sir synchronous motor most stable unity power factor pe hogi. na ki leading pe..que,12
Sir questions 17 ja answer to aapne field current bataya tha, ye load angle kaise ho gaya
Thanks
Please make vedios of measurement and include numerical also
Sure.
Sir questions no. 22 ka supply voltage change bhi to ho Sakta hai explain plz
Yes but for a fixed operating speed the most significant is to change the Frequency.
Sir haryana jee ka paper hai 1 sept ko pls sir electrical jee k jitne b important questions ho pls 1 video bna do sir 1 sept se pehle pls
Nice
Hllo sir please request ukssc je. Upcl PTCUL je paper solution electrical engineering
Good job sir
I like very nice
Thank you sanket. Do share and stay tuned.
Sir questions no. 15 ka answer achhi tarah explain kar dijiye
Sure, Manish I will consider this in my next session.
Sir have you cross check the Q. No 18
there is a mistake in Ques.18- damper windings on rotor poles should be the answer.
Thank you Vibha for your kind response i will crosscheck the same soon.
Yes sir ans of que no 18 will be damper winding on rotor poles
Sir please make video on important numericals for rrb je level from machine and Power system
Sure. Stay tuned for more sessions.
Sir v curve Apne galat banaya hai x axis field current hoga tab na excitation change karne pe armature current ayega mean ia depends on If
I appreciate your keen observation salman and thank you for your kind correction. The explained curve has been blurred out to avoid confusion and corrected figure will be uploaded in the pdf as well. Stay tuned and DO share.
6:52
nice
Sr lag.tealugulo bolo chapadi
18 ka A hoga
Question 18 answer may be option A.
I'll cross check usman. Kindly Stay tuned.
Thanx Sir..
Sir what is the power developed by a synchronous motor....
According to u if we put 0 degree as torque angle in thr फार्मूला v*eb/xs **sin§ if we put del is equal to 0 then the power developed is 0
M i right sir or not??
Correct. Sin 90 Degree equals to 1 and so the power developed will be maximum.
Ok thnx sir
Database mcq bi hona chahiye
Sir,
Kindly share synchronous motor pdf
what is the difference between Field and Armature?
Winding which produces main flux called field winding where winding carrying current( Load or source current) called armature winding
Hi sir
sir theori class suru kare jaldi
Bhai pls volume loud karo
i m having CONFUSION IN QUESTION NO " 13"
I THINK CORRECT ANSWER IS "90 DEGREE"
How's 90 degree... Torque angle is the angle between rotor and stator. while no load the angle between this two is 0... Bcoz they are coincide each other... Dont confused its very simple to think
Q 18 answer may be option 1
D is right
how answer is D
Answer a is ryt
Answer bhi likh diya kro na ,
Sir, please share the pdf of this video if u have.. Very urgent for me.
PDF has been uploaded on the telegram. Kindly DO Download Rakesh and Share it with your friends.
@@ElectricalEngineeringMCQs Okay Sure Sir..
Thankzz For the Reply
Damper winding Kia hai💥💥💥
Damper winding helps to start synchronous motor as a Induction motor in its initial run.
Sir iska pdf de dijiye
Sir 18 ka a hona chahiye
Thank you for your response Satyam I will crosscheck and rectify if any and same will be updated in the PDF as well DO Share this session with your friends.
Sir I have a all subject's pdf plz sir
Sure Karuna I will upload them on the telegram channel .
Thank you so much sir 🙏
Sir apdcl ke liya JE ka paper solve digiaa..... It's so important.... 🙏🙏🙏
Sure. I have taken your request Kindly Stay tuned I will try to upload the same shortly.
sir pdf
Copy of V K mehta objective questions..
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Sir Help me Electrical MCQ ??
Sure kindly elaborate your concern.
33 vala nhi samjh me aya
I will consider the same question soon Satyam. Kindly DO Share this session with your friends.
प्रशन पढ भी नही पाते है बहुत जलदी करते हो
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