• 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
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 50 Hz
 25 Hz
 100 Hz
 0 Hz

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

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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
When a DC cummulative compound wound motor is loaded

 Torque decrease and speed increases.
  Torque increase and speed decrease.
 Both torque and speed decrease.
 Torque and speed both increase.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  s2.
  sf.
  f / s.
  sf / 2.

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

 48.0%.
 88.8%.
 59.2%.
 57.1%.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Larger values of air flux density is taken while designing IM for

  both.
  larger output.
  larger bore diameter.
  none.

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
↑