Unit –
2, AC Motor Control CircuitsSubject: Control of Electrical Machines Scheme: M
NOTE : 1. The highlighted Questions are asked more than two times in the Board Exam
2. These Questions are collected from Board Examination Question Papers
2/3
marks questions
1. List any three starters for AC motor.
2. What is the need for timer relay in star – delta starter?
3. Write the principle of dynamic braking and how it is applied for 3 phase induction motor?
4. What is the motor current at starting and during the acceleration?
5. What are the types of speed controller of AC motor?
6. Write the types of timer use in automatic star – delta starter.
7. Mention the HP upto which the DOL starter can be used.
8. Which motor can be started by secondary frequency acceleration starter?
9. Name the starter used for slip ring induction motor
10. Draw the control circuit of DOL starter.
11. Compare the semi – automatic and automatic star – delta starter.
12. Draw the control circuit of automatic auto transformer starter in open circuit transition.
13. What is open circuit transition?
14. Mention any two precautions to be taken for reversing control of AC motor.
10
marks questions
1. Draw and explain the control circuit of automatic 3 step rotor resistance starter for wound induction motor
2. Explain automatic transformer starter (open circuit transition) with neat diagram.
3. Draw and explain the winding for 2 speed control of induction motor.
4. Explain dynamic braking of induction motor with neat sketch.
5. With a control circuit, explain the working of semi-automatic star delta starter.
6. With a control circuit, explain the operation of dynamic braking applied to three phase cage induction motor.
7. Draw and explain the control circuit of automatic rotor resistance starter for three phase slip ring induction motor.
8. Explain DOL starter with neat sketch,
9. Explain the operation of secondary frequency acceleration starter with neat control circuit.
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