• 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
Iron losses in a DC machine are independent of variation in

 speed.
  load.
  speed and voltage.
  voltage.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be doubled.
  It will becomes four times.
  It will be halved.
 It will remain the same.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 6 Ω
 1.9 Ω
 5.7 Ω
 2.2 Ω

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 50Hz.
 100Hz.
 200Hz.
 150Hz.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The condition for maximum running torque is

 0.707 lagging
 zero
 0.5 lagging
 unity
 R = S.X

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 both 1 and 2.
 no torque.
 damping torqe.
 eddy current torque.

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
↑