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26211-11 Control Systems and Concepts

1. A low-voltage control circuit ________.

Question 1 of 30

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

Question 2 of 30

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

Question 3 of 30

4. 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 4 of 30

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

Question 5 of 30

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

Question 6 of 30

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

Question 7 of 30

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

Question 8 of 30

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

Question 9 of 30

10. What is the purpose of a shading coil?

Question 10 of 30

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

Question 11 of 30

12. Lighting contactors ________.

Question 12 of 30

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

Question 13 of 30

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

Question 14 of 30

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

Question 15 of 30

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

Question 16 of 30

17. Emergency lighting circuits often use ________.

Question 17 of 30

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

Question 18 of 30

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

Question 19 of 30

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

Question 20 of 30

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

Question 21 of 30

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

Question 22 of 30

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

Question 23 of 30

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

Question 24 of 30

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

Question 25 of 30

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

Question 26 of 30

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

Question 27 of 30

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

Question 28 of 30

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

Question 29 of 30

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

Question 30 of 30


 

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