N2 Electrical Trade Theory: Module 7 – Alternating current machines
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Question 1 of 29
1. Question
Q1 – How is the phase in split-phase motors split?
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Question 2 of 29
2. Question
Q2 – Is a single-phase induction motor self-starting? Give a reason for your answer.
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Question 3 of 29
3. Question
Q3 – What is the main difference between a capacitor start induction-run and a capacitor-start capacitor-run single-phase induction motor?
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Question 4 of 29
4. Question
Q4 – AC machines can be classified under two main categories. Name them.
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Question 5 of 29
5. Question
Q5 – Name THREE main types of single-phase motors.
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Question 6 of 29
6. Question
Q6 – What is done to enable a single-phase induction motor to start?
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Question 7 of 29
7. Question
Q7 – Give a brief description of the construction and operating principles of a split- phase AC induction motor. Use a diagram to help you.
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Question 8 of 29
8. Question
Q8 – What is the advantage of leaving a capacitor in the circuit of the auxiliary winding of a single-phase induction motor while it is running?
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Question 9 of 29
9. Question
Q9 – What are capacitors used for with single -phase induction motors?
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Question 10 of 29
10. Question
Q10 – Give THREE applications of the shaded pole motor.
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Question 11 of 29
11. Question
Q11 – What is meant by a universal motor and why is it named as such?
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Question 12 of 29
12. Question
Q12 – What is the purpose of the centrifugal switch often found in split-phase motors?
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Question 13 of 29
13. Question
Q13 – Capacitor-start induction-run motors are used for loads of higher inertia where frequent starting is required. Name THREE such applications,
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Question 14 of 29
14. Question
Q14 – With the aid of neat sketches, show how the direction of rotation of a single- phase split-phase motor may be reversed.
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Question 15 of 29
15. Question
Q15 – To ensure that the motor you want to use is in a good condition, there are two basic inspections (tests) that must be done. Name the TWO tests.
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Question 16 of 29
16. Question
Q16 – Name Two visual electrical as well as mechanical inspections of a single- phase motor.
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Question 17 of 29
17. Question
Q17 – Discuss the TWO main parts of the electrical inspection of an AC motor.
a) The continuity resistance test
b) Insulation resistance test
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Question 18 of 29
18. Question
Q18 – With the aid of sketches, explain the difference between a wound rotor and a squirrel cage rotor of an induction motor.
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Question 19 of 29
19. Question
Q19 – Name the TWO main parts of a three-phase induction motor.
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Question 20 of 29
20. Question
Q20 – Explain that you understand by the rotor of an AC motor.
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Question 21 of 29
21. Question
Q21 – Explain how the energy is transferred from the stator to the rotor in an induction motor.
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Question 22 of 29
22. Question
Q22 – Explain what you understand by the term slip
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Question 23 of 29
23. Question
Q23 – Give THREE advantages of three-phase motors compared to single-phase motors.
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Question 24 of 29
24. Question
Q24 – With the aid of sketches, show how the direction of rotation of a three-phase induction motor may be reversed.
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Question 25 of 29
25. Question
Q25 – Can the rotor of an induction motor reach synchronous speed? Give an explanation for your answer.
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Question 26 of 29
26. Question
Q26 – Show the external connections on the terminal block of a three-phase induction motor when it is:
a) Delta connected.
b) Star connected.
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Question 27 of 29
27. Question
Q27 – Briefly describe the principle of operation of a three-phase induction motor.
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Question 28 of 29
28. Question
Q28 – Explain how you would conduct an insulation resistance test between the windings on the stator of a three-phase induction motor. The appropriate test values must be given.
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Question 29 of 29
29. Question
Q29 – Name THREE applications of three-phase induction motors.
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