• 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

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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The armature shaft must be able to withstand

 any unbalanced magnetic pull on the armature core.
 bending moment due to weight of the armature.
All of these
 twisting strains due to transmission of torque.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie in the inter polar gaps.
 lie under south pole.
 there is no hard and fast rule for this.
 lie under north pole.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  an integral multiple of number of rotor slots.
  either (B) or (C).
  equal to number of rotor slots.
  unequal to number of rotor slots and skewed in shape.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 57.1%.
 48.0%.
 59.2%.
 88.8%.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In DC machine yoke offers

 flux path completion
 both A and B
 produce working flux
 mechanical protection to the machine

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
↑