topic Re: Sample Exam Solutions for Review in Certification

Sample Exam Solutions for Review

JordanG — Tue, 03 Jan 2012 17:22:11 GMT

This thread is dedicated to providing a centralized place for reviewing sample exam solutions and providing feedback. Feel free to post your solutions to any of the sample exams to receive feedback from other users in the forums. You can also go to the Certification Preparation Page to view all the official preparation resources the Certification Development team has made available online.

Re: CLD Sample Exam Comments?

ZLuo — Fri, 30 Dec 2011 10:46:28 GMT

Studens

Re: Sample Exam Solutions for Review

PHarris — Thu, 02 Aug 2012 15:26:15 GMT

Hello,

So it's a bit late really considering I have the exam first thing tomorrow, but I did my last two practice exams this week for the ATM and Sprinkler system and thought I'd pop them up to see if anyone has some last minute feedback or wise words. Both are saved for LV 8.6.

I've actually only been using LabVIEW for about 12 months and not as a full time developer, so I probably fall a bit short of the recommended experience, but the opportunity arose and I figured there's no harm in giving it a shot!

Thanks in advance for any feedback or pointers...

Re: Sample Exam Solutions for Review

Manushak — Tue, 28 Aug 2012 10:31:53 GMT

Hello all.
i preparing for CLD in september. And I would like to know about my mistakes. It will help me to solve well.

Re: Sample Exam Solutions for Review

Rodéric — Wed, 29 Aug 2012 08:00:36 GMT

Manushak

-Spell checking

-Wait 200ms => requirement: Respond to front panel controls (within 100 ms)

-Wire bends

-Timer VI: place comments inside, use error terminals, use a better icon (prettier), wire bencds

-Log file VI: FP saved as maximized... wire bends (same for Pre purge VI)

-Use type defs for UI controls

-Use tip strips for UI controls!!!

I did not check for the functional requirements.

My opinion is you really need to focus on your neatness because you'll loose points on style. You'll loose points on documentation since you did not use tip strips for UI controls, and a sub VI lacks of comments. Actual CLD takes more time than sample exams so you may need to improve your coding speed.

Re: Sample Exam Solutions for Review

Manushak — Wed, 29 Aug 2012 18:38:00 GMT

Thank you for replying

Re: Sample Exam Solutions for Review

felde — Mon, 10 Sep 2012 12:55:03 GMT

Hi everyone,

Here is my solution for the ATM simulator (I was able to finish it in less than 4 hours but I took a look at another solution before which had a complete different design).

I’m sure that this solution needs more documentation and since I used the read/write spreadsheet VI without error in/out my error - handling is not ok.

I would be glad if someone could take a look and give me a feedback

It is a translation of my German version. I hope I did not too many mistakes in translating all the ATM massages and comments

Thanks

Re: Sample Exam Solutions for Review

JÞB — Mon, 10 Sep 2012 15:45:35 GMT

Overall Very nice.

Can you link the requirements? The last I read them the app was supposed to exit if E was not pressed after the card was inserted. (I agree that your behavior is mor appropriate but if you deviated from spec you should have justified it with a comment.

Nicly commented!

Great use of a Resource Module for the File IO!

One nearly fatal flaw though. Where are the tip strips on the FP user objects? Those tip strips are your Primary means of telling the user what they are seeing and what to expect when they click.

Where is the ICON for the GUI

Two style questions for you to consider on the button and menu clusters. You allways convert to arrays anyhow when the buttons are pressed so, why did you use clusters? Boolean Array to number would have generated an integer case selectorthat could have been cast to a Ring type def [hint: use binary representation in the ring and case to really correlate the two] And, those Ring string propertiy>Strings could have populated your menus! Just a bit easier to scale IMHO AND it is a lot faster to select a case from an int than a string. (Really, try it! )

Re: Sample Exam Solutions for Review

felde — Tue, 11 Sep 2012 12:42:17 GMT

Thank you for replying,

I have the requirements only in German but you are right. It says that the application should be terminated after 10s inactivity or after pressing "Return Card".

Are tip strips really so important? In this case the menu and the message box should be enough since there are no tip strips on a real ATM.

Once I did copy&paste: Withdrawal is implemented in the event “Enter Button” and in the event “right buttons/left buttons” (fast cash) and when I changed the language I realized that it is easy to make mistakes there. Is that a major issue?

Maybe a solution with a Boolean array would be easier but with a cluster you are more flexible with the appearance of the control (including individual tip strips) and the mechanical behaviour “Latch When Released” is not working with an array.

Re: Sample Exam Solutions for Review

JÞB — Tue, 11 Sep 2012 13:17:20 GMT

@felde wrote:

Thank you for replying,

I have the requirements only in German but you are right. It says that the application should be terminated after 10s inactivity or after pressing "Return Card".

Are tip strips really so important? In this case the menu and the message box should be enough since there are no tip strips on a real ATM.

Once I did copy&paste: Withdrawal is implemented in the event “Enter Button” and in the event “right buttons/left buttons” (fast cash) and when I changed the language I realized that it is easy to make mistakes there. Is that a major issue?

Maybe a solution with a Boolean array would be easier but with a cluster you are more flexible with the appearance of the control (including individual tip strips) and the mechanical behaviour “Latch When Released” is not working with an array.

Tip Strips really are that important! Lack of them will be a deduction on the exam. So will failing to organize the solution as a project (I understand the new CLD format actually provides a starting point project file so as long as you know how to use LabVIEWs project explorer you won't have to wonder about how to save)

I can accept your rationale for using clusters vs arrays. I just asked because I saw the cluster to array primitaves and it tweeked my "is this a Rube-Goldberg construct?" button.

Re: Sample Exam Solutions for Review

Manushak — Tue, 11 Sep 2012 14:59:07 GMT

Hello all
I have solution for "sprinkler controller".
I would be glad if someone could take a look and give me a feedback.
I want to write more comments, but my english is poor and there are many mistakes in my texts. Do you know, can i have any translater with me in time of exam. Or can i use online translators. It will help my very much.

Re: Sample Exam Solutions for Review

JÞB — Tue, 11 Sep 2012 18:17:37 GMT

@Manushak wrote:

Hello all
I have solution for "sprinkler controller".
I would be glad if someone could take a look and give me a feedback.
I want to write more comments, but my english is poor and there are many mistakes in my texts. Do you know, can i have any translater with me in time of exam. Or can i use online translators. It will help my very much.

Overall a C- job Some things you did well. Please excuse me for only pointing out the flaws as my time is limited.

You have some bad habits that you need to break;

Icons. They need to convey information to the next maintainer of your code. Is that a flame under a teakettle? Like GUIs the color usage in icons should avoid garashness and help aid clairity. Your file read vi icon uses a glyph I would associate with a error dialog.
Use a project
Tip Strips on every object the user can see on the GUI!
Timing- you have failed to meet spec on preserving the elapsed time if rain occurs durring the servicing of a zone. You need an elapsed timer with a pause feature.
Wire bends. Enough said?

Re: Sample Exam Solutions for Review

StevenHowell — Tue, 11 Sep 2012 21:54:03 GMT

Good afternoon,

I am taking the CLD exam tomorrow morning and wanted to submit my sample exam for review. I was able to finish it in just about 4 hours.

Here is my solution, please provide feedback.

Thanks.

Steven

Re: Sample Exam Solutions for Review

Manushak — Wed, 12 Sep 2012 08:03:16 GMT

Thank you for replying.
To know about flaws of my work more important for me in this time. I will give more attantion to them.
About timing: In requirements I couldn't understand, that when raining, time will be paused, and then will be continued.

Re: Sample Exam Solutions for Review

Manushak — Fri, 28 Sep 2012 08:51:15 GMT

Hello all. I have got CLD (85 %).

Thanks all of you for helping with yours remarks and advises.

Re: Sample Exam Solutions for Review

JÞB — Fri, 28 Sep 2012 13:08:53 GMT

@Manushak wrote:

Hello all. I have got CLD (85 %).

Thanks all of you for helping with yours remarks and advises.

CONGRATULATIONS!

Re: Sample Exam Solutions for Review

HelenC — Sun, 02 Dec 2012 16:13:59 GMT

Hi,

I have my CLD exam on Friday 7th Dec and have spent this afternoon doing the Boiler sample exam.

I would be greatful for any feedback.

The file is LV2012.

Thanks,

Helen

Review my sprinkler code please

winterishere8 — Fri, 18 Jan 2013 20:07:12 GMT

All

Could you kindly review my sprinkler code ? I've attached 2 versions. One in LabVIEW 2012 and one in 2011. Each folder should have the PDF document if you need it. Please provide feedbacks 🙂

Thank you very much.

P.S: I need to say that I didn't use time as a constraint on this exam. I wanted to get it all right first and then work on my timing. Thanks again !!

Re: Review my sprinkler code please

ThiCop — Wed, 30 Jan 2013 20:21:54 GMT

Hello,

I did a quick browse through your code.

Here are the things I found at first sight.

Some unnecessary bent wires.
Some constants lack a label. (eg. Enable/Disable command for the Enable Disable VI)
Also the Stop state constant lacks labeling.

Choice for design pattern is not explained.

You should only use "Default if unwired" if you're working with an event structure and even then it is sometimes advised to use a clearly visible constant.W
If you have a disable/enable VI, then please use it for all disabling/enabling. (eg. start button does not use this subVI, the cluster does)

Some clusters on the front panel are missing description and tip strip.

Controls and indicators in subVI's do not seem to have descriptions (or tip strips). They should at least have a description.

One good tip would be to run the VI analyzer on your main and your subVI.
This will directly show certain style/documentation issues.

Re: Review my sprinkler code please

winterishere8 — Wed, 30 Jan 2013 20:46:55 GMT

Thank you so much Thierry ! Your feedback is appreciated.

I know, documentation is one of my sore points and I need to improve.

Do you have any inputs on the functionality and style ?