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- If your pass mark is 90% or more this proves that you already have a good knowledge relating to Proportional Hydraulics. However, if you feel that you need a refresher including hands on experience, we recommend that you attend the “Stage 2 Proportional Hydraulics Course” (3 Days) at the NFPC, especially if 3 years have passed since your last Proportional Hydraulics Course.
- If your test mark is less than 90%, we recommend that you attend the “Stage 2 Proportional Hydraulics Course” (3 Days) here at the NFPC
- Less than 45% we would recommend attending the Stage 1 “Introduction to Proportional Hydraulics” 1 Day Course here at the NFPC
- This test contains questions of various weightings based on their importance
- You have 20 minutes to complete this test
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Question 1 of 64
1. Question
A pressure compensated flow control valve:-
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Question 2 of 64
2. Question
How is the spool rating of a conventional proportional valve defined?
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Question 3 of 64
3. Question
Why are these types of devices termed “proportional” hydraulics?
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Question 4 of 64
4. Question
What is the oil temperature usually specified when defining valve spool rating?
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Question 5 of 64
5. Question
What does the acronym “OBE” mean?
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Question 6 of 64
6. Question
A 2 stage relief valve must have the following to work properly
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Question 7 of 64
7. Question
What is the term used for a proportional valve operated by a changing current input without feedback?
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Question 8 of 64
8. Question
The information printed on a proportional valve states that it is a 24Vdc system. Does this mean?
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Question 9 of 64
9. Question
What does the abbreviation “PWM” stand for?
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Question 10 of 64
10. Question
The ISO 4406 Cleanliness level is
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Question 11 of 64
11. Question
What does the abbreviation “LVDT” stand for?
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Question 12 of 64
12. Question
What is the term used for a proportional valve that has an LVDT fitted?
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Question 13 of 64
13. Question
In proportional control systems, what do we mean when we use a “Dither” signal?
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Question 14 of 64
14. Question
What does the term “Command Value” mean?
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Question 15 of 64
15. Question
What is the meaning of the term “Deadband Compensation”?
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Question 16 of 64
16. Question
What can a Servo proportional direction control valve do?
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Question 17 of 64
17. Question
In a proportional valve control unit, what does the function called “Ramp” do?
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Question 18 of 64
18. Question
What is an alternative term used instead of the term “Gain”?
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Question 19 of 64
19. Question
When testing a proportional control circuit output to a solenoid coil, what would be best to look for?
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Question 20 of 64
20. Question
If a proportional direction control valve is used to control a system, where the load is not constant what else should be fitted in the system to allow the valve to work properly?
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Question 21 of 64
21. Question
Which of the following statements is false
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Question 22 of 64
22. Question
Which of the following devices need the cleanest oil supply?
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Question 23 of 64
23. Question
A direct proportional pressure relief valve is capable of the following:-
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Question 24 of 64
24. Question
When fitted with a Proportional valve a Counterbalance valve should ideally :-
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Question 25 of 64
25. Question
Proportional DCV Solenoids have the following:-
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Question 26 of 64
26. Question
Proportional DCV solenoids have brass areas on the armature stem:-
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Question 27 of 64
27. Question
A Proportional DCV spool is shaped:-
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Question 28 of 64
28. Question
What does the term “sensitivity” mean to proportional control systems?
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Question 29 of 64
29. Question
Which adjustment do we make to create steady deceleration on motor speed until it stops?
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Question 30 of 64
30. Question
The “repeatability” of a proportional control system refers to its:-
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Question 31 of 64
31. Question
When referring to a proportional relief valve which statement is false
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Question 32 of 64
32. Question
What does the “Linearity Error” of a proportional device refer to?
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Question 33 of 64
33. Question
What does the simplified symbol mean?
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Question 34 of 64
34. Question
What does this symbol mean when used on a proportional valve?
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Question 35 of 64
35. Question
When referring to proportional hydraulic valves, what is meant by the term “Asymmetric”?
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Question 36 of 64
36. Question
A piston pump will do the following when a proportional relief valve raises the system pressure
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Question 37 of 64
37. Question
Which of the following is true when talking about a direct operated Proportional Relief valve
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Question 38 of 64
38. Question
When using a two-stage proportional direction control valve without position monitoring built-in, what type of pilot valves are used?
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Question 39 of 64
39. Question
When using a symmetric proportional DCV to control the movement of a cylinder, why is retract velocity lower than extension velocity?
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Question 40 of 64
40. Question
What does the acronym “PID” stand for?
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Question 41 of 64
41. Question
what type of valve is shown here?
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Question 42 of 64
42. Question
What type of valve is shown here?
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Question 43 of 64
43. Question
When connecting a valve driver module, how is the command device supplied?
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Question 44 of 64
44. Question
The control wires connecting a proportional system should be as follows:-
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Question 45 of 64
45. Question
Single Proportional DCV’s can be made to work as flow controllers with twice as much flow:-
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Question 46 of 64
46. Question
The design of DIN Form A connectors on a Cetop 3 proportional valve has the following:
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Question 47 of 64
47. Question
The frequency of dither imposed on a spool is measured in:-
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Question 48 of 64
48. Question
Dither frequency is usually between:-
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Question 49 of 64
49. Question
The command signal entering an Amplifier is usually:-
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Question 50 of 64
50. Question
Inductance is the ability of:-
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Question 51 of 64
51. Question
Increasing the setting of the I-Min will:-
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Question 52 of 64
52. Question
Regarding Proportional valves, which of the following statements is false:-
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Question 53 of 64
53. Question
Looking at the symbol, which of the following is missing?
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Question 54 of 64
54. Question
Regarding Servo Proportional valves, which of the following is False
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Question 55 of 64
55. Question
Some proportional valves have a bleed screw on the solenoid:-
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Question 56 of 64
56. Question
Pulse Width Modulation is a method to:-
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Question 57 of 64
57. Question
Which of the following statements is true:-
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Question 58 of 64
58. Question
Regarding the pressure limit of a Direct Acting Proportional pressure relief valve:-
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Question 59 of 64
59. Question
Plug top amplifiers are defined as:-
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Question 60 of 64
60. Question
A LVDT sensor fitted onto a Proportional DCV:-
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Question 61 of 64
61. Question
Proportional DCV’s are best controlled with which type of command input?
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Question 62 of 64
62. Question
A hydraulic pump is used in hydraulic system to do what?
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Question 63 of 64
63. Question
Identify the device from the symbol shown
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Question 64 of 64
64. Question
When oil flows through a restrictor what is seen to occur?
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