The speed of fan is reduced by joining a variable resistance in series. If D.C. is used to move the fan, then

Options :
  1. the power used is same as on full speed of fan
  2. the more power is used than at the full speed of fan
  3. less power is used but efficiency of fan decreases
  4. less power is used and efficiency of fan is increased

Answer and Explanation :-

Answer: Option 3


Sorry there is no explanation for this answer. Please help others by posting your response below

How do you rate this queston?  Very Easy  Easy  Average  Above Average  Tough

Previous Question : A choke coil has

Next Question : Choke coil is used to control

Click here for online test on Electrostatics


 (Getemail alerts when others member replies)

More questions and answers on Indian History :-

Y por que el sol es tan mal amigodel caminante en el desierto?Y por que el sol es tan simpaticoen el jardin del hospital?And why is the sun such a bad companionto the traveler in the desert?And why is the sun so congenial in the hospital garden?
-Pablo Neruda