135) Speed of 3-phase induction motor is controlled by 3-phase a c. voltage controller. If firing angle is decreased, then (1) speed increases & peak torque decreases (2) speed decreases & peak torque increases (3) speed increases & peak torque increases (4) speed decreases & peak torque decreases 136) A chopper fed de motor runs with discontinuous armature current at particular duty ratio. The current can be made continuous by (!) increasing duty ratio (2) increasing frequency (3) decreasing duty ratio (4) decreasing frequency
1. In alpha=60degree why g1,g3,g5 conducting for 120 degree And at alpha= 120 degree g1,g3,and g5 conducting for 90 degree?? 2. Why the conduction angle of thysistors are indicated differently? How do i understand how much extended gate pulse should i give
Bro, Look at AN waveform , as alpha =60 degrees , thyristors conduct from 60 degrees of AN waveform till AN first zero crossing , so till that point we get conduction , i.e. total 90 degrees
Prof,why you did not explain about interval 3 & 4 how Van is minus Aab/2 and minus Vac/2?? and the most crucial point i,e how you derive the expression for Vrms .. the base value in the integration and limit of integration.?? then what is the use of this video ???
this is the only video that made me understood whats the concept. thank you sir
135) Speed of 3-phase induction motor is controlled by 3-phase a c. voltage controller. If firing angle is decreased, then
(1) speed increases & peak torque decreases (2) speed decreases & peak torque increases
(3) speed increases & peak torque increases
(4) speed decreases & peak torque decreases
136) A chopper fed de motor runs with discontinuous armature current at particular duty ratio. The current can be made continuous by
(!) increasing duty ratio
(2) increasing frequency
(3) decreasing duty ratio
(4) decreasing frequency
1. In alpha=60degree why g1,g3,g5 conducting for 120 degree
And at alpha= 120 degree g1,g3,and g5 conducting for 90 degree??
2. Why the conduction angle of thysistors are indicated differently?
How do i understand how much extended gate pulse should i give
Bro, Look at AN waveform , as alpha =60 degrees , thyristors conduct from 60 degrees of AN waveform till AN first zero crossing , so till that point we get conduction , i.e. total 90 degrees
@@swathireddy52 then for a= 120, why it is not crossing zero point of v an
a means alpha
Same question 🥲
The explanation isn't for alpha = 60 degree, instead it is for alpha = 30 degree. Correct me if i am wrong.
I also think that is correct. but no finding more evidence to proof that. Can you give more evidence on this?
Can you answer this question
Prof,why you did not explain about interval 3 & 4 how Van is minus Aab/2 and minus Vac/2?? and the most crucial point i,e how you derive the expression for Vrms .. the base value in the integration and limit of integration.?? then what is the use of this video ???
bogus video totally ..
Bad explanation 🫠