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Efficiency of DC Machines (in Hindi)
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In this course we will discuss about efficiency of dc machines

Manish Shakya
I AM A SELF- STARTER WITH STRONG INTER PERSONAL SKILLS.I SEEK NEW CHALLENGES AND TRY TO THINK OUT OF THE BOX WHILE LOOKING FOR CREATIVE SOLU

U
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1. DC MACHINES

2. EFFICIENCY OF DC MACHINES By- MANISH KUMAR SHAKYA

3. ABOUT ME B.TECH WITH ELECTRICAL AND ELECTRONICS FROM KIET,GHAZIABAD IN 2012 CLEARED GATE,SBI AND IBPS BY- MANISH KUMAR SHAKYA FOLLOW ON- https://unacademy.com/user/ manishshakya-4406

4. TARGET AUDIENCE B.tech students of electrical branch Students who are preparing for gate Students who are preparing for engineering services examination Students who are preparing for various psu's Students who are preparing for RRB JE exam

5. COURSE OVERVIEW INTRODUCTION OF DC MACHINES TORQUE EQUATION EFFICIENCY OF DC MACHINES ARMATURE REACTION SPEED CONTROL OF DC MACHINES

6. EFFICIENCy oF GENERATOR MOTOR OUTPUT PoNER OUTPUT PoWER+ Loss Es GENERA ToR 8D MoTOR- VI

7. 11: OUTPUT powER = CONSTANT Losses Nai- BRUSH CoNTA CT Loss es BD Ve = OUTPUT VOLTAGE t. LOAD CORRENT IN THE BACK To BACK TEST CIRcuIt As SHowN IN FiGURE MACHINE ALs a MOTOR DRINING MACHINE 'B HicH s A GENERATOR, THE PowlER TAKEN-ROM THE 250V SOURCE ls IN DIFFERENT PART OF Loss ES ONLy. CURRENTS CIRCUIT ARe Aso GlveN IN THE fiGURE. AssUme BRUSH DROP Is 2V fOR EACH MACHINE.

8. IHPUT CURRENT 2.4 A 2A 50A HOA 2 0.3 0 (a) WHAT s THE ErFICIENcy 0F THE MOTOR (I) 85-42% 2) 5.80 84.84% 107, (D WHAT s THE EFFICIENcy Of THE GENERATOR (a) 81.63% (c) 90,25 % OF THe GENERA TOR? (b) 85.43% (d) 92-46%

9. SoL-(a) TNPUT CURRENT-50-40-10A TO TAL PowER INPUT fROM THE SUPPLy 250 x Io 2500W INPUT Poul ER TO ARMATURE CIRCUIT-250 X 10=256 o w TOTAL ARMATURE LosseS (50)xo3 2 x So +(xos2x4o =1410W TOTAL MECHANICAL Loss= 2500-1410-10 qoWATTS =545 /MACHINE MOTOR EFFICIENcy = l-Losses INPUT 250 (5ot2) 1-1815-85-42% 13000 HENCE OPTION (A) is CoYYect.

10. GENERATOR EfficIENCY OUT PU OUTPUT Loss es 10000 11 05 = = 85.43 .. OPTION (8) 1s CORRECT

11. THANK YOU