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26211-11 Control Systems and Concepts

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

Question 1 of 30

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

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

Question 4 of 30

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

Question 5 of 30

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

Question 6 of 30

7. Emergency lighting circuits often use ________.

Question 7 of 30

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

Question 8 of 30

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

Question 9 of 30

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

Question 10 of 30

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

Question 11 of 30

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

Question 12 of 30

13. 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 13 of 30

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

Question 14 of 30

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

Question 15 of 30

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

Question 16 of 30

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

Question 17 of 30

18. A low-voltage control circuit ________.

Question 18 of 30

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

Question 19 of 30

20. What is the purpose of a shading coil?

Question 20 of 30

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

Question 21 of 30

22. Lighting contactors ________.

Question 22 of 30

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

Question 23 of 30

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

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

Question 26 of 30

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

Question 27 of 30

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

Question 28 of 30

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

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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