• 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, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 60 Hz
 50 Hz
 40 HZ
 25 Hz

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Counter emf of a DC motor

 exceeds supply voltage
 aids applied voltage.
 regulates its armature voltage.
 helps in energy conversion.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The heat transfer by convection in a transformer least depends on

 surface area.
 air velocity.
 temperature difference.
  color of the paint.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
_____________ types of induction motor are widely used.

  Squirrel cage IM.
  Slip ring IM.
  Single phase IM.
  Three phase IM.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 150 V.
 300 V.
  223.V.
 200 V.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

  compensating winding and commutating poles.
 shifting the brush axis from GNA to MNA.
 fixing the brush axis inline with the pole axis.
 increasing field excitation.

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
↑