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Electrician Practice Test: AC & DC Drives
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Electrician Practice Test: AC & DC Drives
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25 Questions

1. What is electric drive?
2. Which control system is used for Eddy current drives?
3. What is the disadvantage of DC drive?
4. Which is the correct sequence operation of key button in BOP of AC drive to change the direction of rotation?
5. Why are AC drives are better suited for high speed operation?
6. How the constant torque can be obtained from armature and field-controlled drives?
7. Why it is necessary to keep V/F ratio constant in a drive?
8. What is IGBT in VF drive?
9. What is the function of VSI drives?
10. What is the purpose of PROG / DATA button in BOP of AC drive?
11. Which is proportional to the torque in DC motor?
12. What is the main use of AC drive?
13. Which is the application of single quadrant loads operating in first quadrant in drives?
14. What is the purpose of JOG key in control panel of DC drive?
15. How the base speed of DC shunt motor can be increased by using DC drive?
16. What is the function of Field Supply Unit (FSU) in DC drive?
17. What is the purpose of LCD on basic operator panel in DC drive?
18. What is the advantage of AC drive compared to DC drive?
19. Which is the classification of drive according to dynamics and transients?
20. What is the name of the component marked as X’ in the block diagram of AC drive?
21. Which control system consumes very low power for motion control in AC and DC motors?
22. Which device controls the speed of AC motor in AC drive?
23. What is the reason of using shielded cable power for connecting low level signal circuits in DC drives?
24. Which type of machine in industries is provided with multi motor electric drive?
25. What is the function of power controller in drive circuits?