Electrical Engineering : Polyphase Induction Motors QUESTIONS AND ANSWERS :: part3 : 1 to 5
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
1.In case of 3-phase induction motors, plugging means |
| pulling the motor directly on line without a starter |
| locking of rotor due to harmonics |
| starting the motor on load which is more than the rated load |
| interchanging two supply phases for quick stopping |
2.In a three-phase induction motor |
| power factor at starting is high as compared to that while running |
| power factor at starting is low as compared to that while running |
| power factor at starting in the same as that while running |
| power factor at starting is low as compared to that while running |
3.Blocked rotor test on induction motors is used to find out |
| leakage reactance |
| power factor on short circuit |
| short-circuit current under rated voltage |
| all of the above |
4.A 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6 poles. The slip of the machine will be |
| 0.01 |
| 0.02 |
| 0.03 |
| 0.04 |
5.The torque of a rotor in an induction motor under running condition is maximum |
| at the unit value of slip |
| at the zero value of slip |
| at the value of the slip which makes rotor reactance per phase equal to the resistance per phase |
| at the value of the slip which makes the rotor reactance half of the rotor |
More Polyphase Induction Motors QUESTIONS AND ANSWERS available in next pages
-
Health is the greatest gift, contentment is the greatest wealth -Buddha
- TNTET 2021 - Practice
- SSC CGL 2021 - Practice
- TNPSC Group 2A 2021 - Practice
- IIT JEE
- IIT JEE Q&A
- TNPSC Answer Keys
- TNPSC Group 2 Syllabus
-
TNPSC Q&A
- Online Tests - TNPSC
- Online Tests - GK
- IBPS 2020-2021
- Online Tests - Bank
- Online Tests - RRB NTPC
- Online Tests - UGC NET
- Online Tests - TANCET
- Online Aptitude Test
-
Engineering
-
Programming
-
Basic Science
-
Quiz
- Plus Two Question Papers
- SSLC Question Bank
-
Aptitude Tests
-
Logical Reasoning
-
General Knowledge-Hindi
-
Indian History MCQ
-
Indian Geography MCQ
-
Indian Civics MCQ
-
Indian Economics MCQ
-
CTET Biology MCQ
-
CTET Chemistry MCQ
-
CTET Physics Solved MCQ
-
Arithmetic Tests
- Press Release
- FAQ
- Coaching Centres
- TNPSC Group 1 Syllabus
-
TNPSC Group IV Syllabus
- TRB 2017 in English PDF
- TRB 2017 in Tamil PDF
- TET
- TNTET
Innovation distinguishes between a leader and a follower.-Steve Jobs
