Answer / qureshi majid ahmed

The dc motors are not much used in the industrry because we
need every time the commutator to convert internally
generated AC voltage into dc voltage.For large scale
industries we can not accomodate commutator in this range.So
even having robust characteristics,they are not preffered
for large machines

Answer / siva shankar

Presently AC supplly is going on thats y... if we keep the DC motor there we need some rectifiers

Answer / naeem anwar

mostly, industry uses an induction motors for constant
speed as required for your jobs just like paper mills,
variation in speed cause paper broken etc.
secondly, vfd(variable frequency drive )are made mostly to
control different parameters of AC motors.

Answer / apoorv

dc motors are not used because of commutation problems , and dc supply has to be given which require rectifiers at generating end and commutators cannot efficently convert ac generated vtg inside dc machine into output dc vtg.

Answer / yash sharma

if you are richy rich you can afford DC motor.simple

I want to know how to calculate the size of electricity cable in building?

0 Answers   DR Engineering Services,

How to distinguish whether MCB is DC or AC looking at it physically

0 Answers  

What will be the excat cable specification in Sq MM...please find the details below.... Induction Motor HP:55 Amps:70(starting Amps),45(Running Amps). Volts:415

1 Answers  

Dear sir,how should i set the relay in star delta starter..say ex i am having 4ohp motor,,wht should be the relay setting...?

4 Answers  

Following test should be conducted to find out relative polarity of transformenr terminals A no load test B back to back test C phasing out test D none of above

0 Answers  

What is the rate of WCT on the Electrical Contracts comprising of DG Sets and Civil Works in Delhi ?

0 Answers   MES Military Engineer Services,

How to test the vector group of a Yd11 transformer? what are the relations to be checked between various vectors to confirm this vector group?

0 Answers  

Why A.C. capacity given in Ton. Ex. - 1.5 Ton

4 Answers   Samsung, UltraTech,

why full load voltage is less than no load voltage?

4 Answers  

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,

Why we apply only reduced voltage to the alternator while conducting slip test ? also the current increases to a larger value with reduced voltage itself Why ?

1 Answers  

How the unidirectional torque produced in dc motor

2 Answers   CGL, Sail,