• 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
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 3000 rpm
 1000 rpm
 750 rpm
 1500 rpm

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T ∝ √P.
 T is independent of P.
 T ∝ P.
 T2 ∝ P3.

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

 59.2%.
 88.8%.
 57.1%.
 48.0%.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 starters
 field winding
 commutator
 armature winding

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  50 Hz.
  25 Hz.
  16.67 Hz.
  60 Hz.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
When maximum starting torque is obtained, rotor power is

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
↑