• HOME
  • QUIZ
  • CONTACT US
EXAMIANS
  • COMPUTER
  • CURRENT AFFAIRS
  • ENGINEERING
    • Chemical Engineering
    • Civil Engineering
    • Computer Engineering
    • Electrical Engineering
    • Mechanical Engineering
  • ENGLISH GRAMMAR
  • GK
  • GUJARATI MCQ

Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 zero
 1470 rpm
 30 rpm
 1500 rpm

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

  Delta side lags by -30°.
 Star side leads by 30°.
 Delta side leads by 30°.
 Star side lags by -30°.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Oil impregnated paper.
  Vacuum.
  Mica.
  Glass.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 2, 3, 4
 2, 3, 4
 1, 2, 5
 1, 3, 5

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  of low resistivity.
  easy to cast owing to its low melting point and is easily available.
  lighter in weight.
  cheaper in cost.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 in parallel
 either of these depending on the design of the motor
 through inductive coupling
 in series

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electrical Machines

DOWNLOAD APP

  • APPLE
    from app store
  • ANDROID
    from play store

SEARCH

LOGIN HERE


  • GOOGLE

FIND US

  • 1.70K
    FOLLOW US
  • EXAMIANSSTUDY FOR YOUR DREAMS.
  • SUPPORT :SUPPORT EMAIL ACCOUNT : examians@yahoo.com

OTHER WEBSITES

  • GUJARATI MCQ
  • ACCOUNTIANS

QUICK LINKS

  • HOME
  • QUIZ
  • PRIVACY POLICY
  • DISCLAIMER
  • TERMS & CONDITIONS
  • CONTACT US
↑