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26211-11 Control Systems and Concepts

1. On magnetic contactors, which contacts are said to be normally open (N.O.)?

Question 1 of 30

2. A low-voltage control circuit ________.

Question 2 of 30

3. Which of the following can provide motor overload protection but have the disadvantage of being nonrenewable?

Question 3 of 30

4. A diamond is a widely recognized symbol used for denoting ________.

Question 4 of 30

5. An opto-isolate solid state relay is activated by ________.

Question 5 of 30

6. The most likely application of a contactor is a ________.

Question 6 of 30

7. Which of the following is a probable cause of a relay failing to drop out?

Question 7 of 30

8. Lighting contactors ________.

Question 8 of 30

9. A motor overload relay consists of a current-sensing unit and a mechanism activated by the sensing unit that ________.

Question 9 of 30

10. Low-voltage remote control switching relays use ________.

Question 10 of 30

11. Remote control wiring shall be installed in accordance with ________.

Question 11 of 30

12. The operating coil is designed to operate the relay at what percentage of rated voltage?

Question 12 of 30

13. Increasing the armature spring force will result in ________.

Question 13 of 30

14. Solid-state relays normally have control voltages of ________.

Question 14 of 30

15. What is the purpose of a shading coil?

Question 15 of 30

16. The overload relays in machines associated with continuous processing typically activate a(n) ________.

Question 16 of 30

17. Contacts that are together when the relay is de-energized are said to be ________.

Question 17 of 30

18. If contactor action is dependant on current flow, the contactor is described as ________.

Question 18 of 30

19. Melting alloy and bimetallic overload relays are designed to ________.

Question 19 of 30

20. Emergency lighting circuits often use ________.

Question 20 of 30

21. Which of the following has the advantage of being resistant to shock and vibration and is commonly used for the I/O track of a programmable controller?

Question 21 of 30

22. The two classifications of overload relays are thermal and ________.

Question 22 of 30

23. The location of all lighting fixtures is shown on the ________.

Question 23 of 30

24. In a magnetic N.O. contactor, the circuit is closed when ________.

Question 24 of 30

25. The low voltage panel enclosure should be installed ________.

Question 25 of 30

26. What is one major advantage of bimetallic overload relays?

Question 26 of 30

27. Mechanically held contacts will be found in the contactors used in ________.

Question 27 of 30

28. Power to operate low-voltage switching systems is supplied by ________.

Question 28 of 30

29. Which of the following symbols is normally used to indicate a separate pilot light?

Question 29 of 30

30. If low-voltage and high-voltage cables must be placed in parallel runs, they should be separated by at least ________.

Question 30 of 30


 

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