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

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