Answer / ahamay

AC current is generated by Rotating a coil in the path of magnetic flux. Any circular motion can be expressed in trigonometric values. Form factor depends on the sine of angle and always constitute 1.11 ((Imax X 2) / 3.14)

Answer / pradeep

The rating of the generators are increased above 33kv.So the rotor size increased.This rotor does not rotating easily

What is short circuit analysis of electrical networks?What are the procedures to be followed for its calculation?

2 Answers   DLF,

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how to calculate kvar in Akiva

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What do you mean by ratio correction factor of instrument transformer?

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Which device of PlC does share load between DG sets when DG are running in perallel?

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Whether earthmat designning is done only for sub station or it can be done for multy residential complexes also? What is the size, type & arrangement of the earth grid to be done?

1 Answers  

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1. alternator has full load regulation of 4% when pf of the load is 0.8 lag, 1500 rpm. full load regulation of 1400 rpm for 0.8lag will be ________ ?? 2. torque angle of a sync m/c operating from a constt voltage bus is usually defined as space angle between _______ . 3. method most effective in finding out no load losses in large DC shunt motoris ______ . 4. current carrying capacity of fuse material depends on ______ . 5. coil has res. 10 ohm, inductance 1H. what wil be current after 0.1sec after switching on to a 500V DC SUPPL ? ? 6. effect of phase lag compensation on servo systems ___________ . 7. rotor of a dc machine is usually supported upon ______ . 8. DC motor is preferred to AC motor in which application ?? 9. 3 nos of 10:1 Xmer are connected in Star-Delta to supply a load at 230V.the supply voltage must be ______ . 10. voltage source produces max current in which circuit. 11. cal. power, if current and voltage are out of phase by 90 degree. 12. suitable length of Xmission line of power at 66 KV. 13. Which of the theorm helps in simple computation when the load across a ckt is varying ?? 14. what is the adopted line length for power Xmission of power by cables ??

5 Answers   TATA,

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what is meant by excitation current & armature current ? where its produce & how we can calculate ?

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In EDO ACBs what is a purpose of closing coil and motor, what is the operation of these devices are they inetconnected. means if we give supply to motor and by BCS we charge Closing coil,what exact is operation is and how it charge a spring of ACB. Sir if anybody has an wiring diagram please send me the link to operate and EDO breaker.

0 Answers   PCE,

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as we know that N=120f/P speed of an im can be controled only through changing no if poles, can we control by changing the frequncy????

7 Answers   JSW,

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we have 1000 litre water tank,it located at 25m hight from ground level,the water level on 10m below from ground level.for fill the tank within 1 hour,how much of motor rating(HP) want to select?

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If we need4× 50mm sq cable but it's not available so we can pull 4×25mm sq 2cables

0 Answers   ABC,

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If i am running of spindle at 2000rpm ,but How to spindle stop at the second I am resetting the machine in CNC machines

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