• 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 commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.512.
  0.573.
 0.649.
 0.443.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 Ia2
 I/Ia2
 1/Ia
 Ia

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Drop in speed from no load to full load is very high in

 Cummulative compound motor with interpoles.
 Series motor with interpoles.
  Series motor without interpoles.
 Shunt motor with interpoles.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Satisfactory commutation of DC machine requires

 brushes should smoothly run in the holders.
All of these
 brushes should be of proper grade and size.
 smooth, concentric commutator properly undercut.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 230 V
 some what less than 230 V
 not possible
 some what more than 230 V

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 350 V.
 400 V.
 480 V.
 420 V.

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
↑