Question
Download Solution PDFWhich of the following is true, considering the rotor of a three-phase induction motor in the blocked state?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
The slip of an induction motor is given by:
\(s={N_s-N_r\over N_s}\)
where, Ns = Synchronous speed
Nr = Rotor speed
Explanation
The rotor frequency of a 3ϕ induction motor is given by:
\(f_r=sf_s\)
When the rotor of a three-phase induction motor is in the blocked state (not rotating), the rotor speed, i.e. Nr = 0
\(s={N_s-0\over N_s}\)
s = 1
The rotor induced frequency is:
\(f_r=1\times f_s\)
\(f_r=f_s\)
Supply frequency = Rotor frequency
Last updated on May 29, 2025
-> MPPGCL Junior Engineer result PDF has been released at the offiical website.
-> The MPPGCL Junior Engineer Exam Date has been announced.
-> The MPPGCL Junior Engineer Notification was released for 284 vacancies.
-> Candidates can apply online from 23rd December 2024 to 24th January 2025.
-> The selection process includes a Computer Based Test and Document Verification.
-> Candidates can check the MPPGCL JE Previous Year Papers which helps to understand the difficulty level of the exam.