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

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