LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
69 views
in General by (110k points)
closed by
During blocked rotor test on an induction motor, the power is drawn mainly for 
1. Core loss
2. Copper loss
3. Windage and frictionless
4. both (a) and (b)

1 Answer

0 votes
by (59.9k points)
selected by
 
Best answer
Correct Answer - Option 2 : Copper loss

Blocked rotor test or short circuit test:

  • It is used to find out series branch parameters (R01­ and X01) of equivalent circuit parameters when referred to the primary side (stator) and the full load copper losses (I2R).
  • By applying rated voltage under a blocked rotor test, the motor will take very high short circuit current which is equivalent to 5 to 8 times of the full load current.
  • We need to apply reduced voltage initially and increase the voltage up to the current drawn by the motor reaches the rated current.


Note:

no-load test or open circuit test is used to find the shunt branch parameters of the equivalent circuit and the constant losses. We can separate these constant losses into iron losses and mechanical losses.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...