• 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
What is the phase difference between two windings of A.C servomotor ?

 60°.
 120°.
 30°.
 90°.

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

 3.1 Ω
 1.79 Ω
 1.8 9 Ω
 2 .1 Ω

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The field system of an alternator is usually excited

  110 / 220 V AC.
  3 - Φ, 50 Hz and 400 V.
  250 / 250 V DC.
  230 V AC.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 infinite value
 any of the above
 maximum
 zero

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 460 V
 65 V
 230 V
 115 V

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Remains unchanged.
  Decreases.
 Oscillates around the rated speed.
 Increases.

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
↑