• 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
Motors for fans and pumps are selected in the rpm range

  1440 to 2880.
  375 to 500.
  720 to 920.
  500 to 720.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The condition for maximum running torque is

 0.707 lagging
 zero
 R = S.X
 0.5 lagging
 unity

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The rotor speed of an induction motor is given by

None of these
  Ns = 120f / p × ( 1 - s ).
  Ns = 120f /p × ( 1 - r).
  Nr = 120f / p × (1-s).

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 increase by 5 %.
 remain unchanged.
 depend on other factors.
 reduce by 5 %.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  crawling.
  cogging.
  relative speed.
  air gap.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V
 V²
 f²
 f

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
↑