• 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 starting resistance of DC motor is generally

 Infinitely large.
  Low.
 1000 ohms.
 around 500 ohms.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Flux density under leading pole tips in case of generator will

None of these
 decrease
 either increase or decrease
 increase

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The use of double squirrel cage winding on the rotor provides

  a large starting torque.
 low noise.
 reduced starting torque.
 higher efficiency.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

All of these
 to avoid over heating.
 to avoid locking of the armature.
 to achieve a stronger magnetic field.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

 4 X 1012 Ω - cm at 27°C and 0.4 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 2166.67V, 230 rpm.
 541.67V, 200 rpm.
 2166.67V, 270 rpm.
 541.67V, 250 rpm.

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
↑