• 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
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 25 ppm.
 20 ppm.
 45 ppm.
  35 ppm.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 remains constant.
 increases with increase in the load torque.
 decreases with decrease in the load torque.
 decreases with increase in the load torque.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The overall power factor of an on load transformer

 is always lagging.
 is always unity.
 is always leading.
  depends on the power factor of the load.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
An unexcited single phase synchronous motor is

 reluctance motor.
 repulsion motor.
  universal motor.
 AC series motor.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.5 ohm.
 50 ohm.
  0.1 ohm.
 100 ohm.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 67.5%
 78.5%
 72.5%
 82.5%

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
↑