• 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 transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 9/16.
 16/9.
 4/3.
 3/4.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

 0.5 mg of KOH / gm.
  0.3 mg of KOH / gm.
  1 mg of KOH / gm.
 2 mg of KOH / gm.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

  12.
 4.
 3.
 7.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 less than 6 V
 zero
 6 V
 more than 6 V

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
During hunting of a synchronous motor

  damper bar develops torque.
  negative phase sequence currents are generated.
  field excitation increases.
  harmonic are developed in the armature circuit.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Which of the following statement is correct, if short circuit ratio is high?

 Good voltage regulation
None of these
 Low short circuit current
 High voltage regulation

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
↑