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26211-11 Control Systems and Concepts

1. Lighting contactors ________.

Question 1 of 30

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

Question 2 of 30

3. 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 3 of 30

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

Question 4 of 30

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

Question 5 of 30

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

Question 6 of 30

7. Emergency lighting circuits often use ________.

Question 7 of 30

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

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

Question 10 of 30

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

Question 11 of 30

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

Question 12 of 30

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

Question 13 of 30

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

Question 14 of 30

15. A low-voltage control circuit ________.

Question 15 of 30

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

Question 16 of 30

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

Question 17 of 30

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

Question 18 of 30

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

Question 19 of 30

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

Question 20 of 30

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

Question 21 of 30

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

Question 22 of 30

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

Question 23 of 30

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

Question 24 of 30

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

Question 25 of 30

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

Question 26 of 30

27. What is the purpose of a shading coil?

Question 27 of 30

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

Question 28 of 30

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

Question 29 of 30

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

Question 30 of 30


 

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