• 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
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
  0.54.
 0.7.
  1.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

All of these
 They are not hard as copper brush
 They are self lubricating in nature
 In case of any sparking they will be less damaged than copper brushes

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 over load.
 high filed circuit resistance.
 all of these.
 zero or very low voltage supply.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 1440, 1500.
 60, 1440.
 50, 1500.
  60, 1500.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 2 .1 Ω
 1.8 9 Ω
 3.1 Ω
 1.79 Ω

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
↑