Monday, 27 March 2017

Interview Questions Answers Related To Valves: -

Questions related to valves: -

  1. What is the function of valves?

Answer: -
  1. Isolation.
  2. Regulation.
  3. Non-Return.
  4. Special purpose.
  1. How the valves are classified based on their function?


A. Isolation.

  1. Gate valve.
  2. Ball valve
  3. Plug valve.
  4. Piston valve.
  5. Diaphragm Valve.
  6. Butterfly valve.
  7. Pinch valve.

B. Regulation

  1. Globe valve.
  2. Needle valve.
  3. Butterfly valve.
  4. Diaphragm valve.
  5. Piston valve.
  6. Pinch valve.

C. Non- Return

  1. Check valve.

D. Special purpose

  1. Multi- Port valve.
  2. Flush Bottom valve.
  3. Float valve.
  4. Foot valve.
  5. Line blind valve.
  6. Knife Gate valve.

  1. How the valves are classified based on its method of operation?

Answer: -

Valves are classified based on its method of operation as: -

  1. Self- operated valves.
  2. Operated valves.

  1. Name the Self – operated & operated valves?


Mainly the check valves are self-operated and all other valve types comes under operated valves.

  1. How the valves are classified based on end connection?

Answer: -

Valves are classified based on end connection as: -
  1. Screwed ends.
  2. Socket ends.
  3. Flanged ends.
  4. Butt weld ends.
  5. Wafer type ends.
  6. Buttress ends.
End connection means arrangement of attachment of the valve with the equipment or the piping.

  1. What are the types of check valves?

Answer: -

Check valves are divided into two types based on check mechanism as: -
  1. Lift check valve.
  2. Swing check valve.

  1. What do you mean by special purpose valves?


Valves that perform duties other than the two-way isolation, control and check are called special Purpose valves.

  1. What are Glandless piston valves? Where these are used?


Glandless piston valves are regulating valves used in steam services.

Friday, 24 March 2017

What Books Recommended to Study for CWI Test?

What Books Do I Need to Study for CWI Test? 

I would suggest the "Welding Inspector's Handbook" available from American Welding Society AWS. If you take the American Welding Society Certified Welding Inspector Training seminar, you will be given a stack of books to study.

If you don't take the CWI Training seminar, Buy the following books:

  • Welding Inspection Technology and Workbook
  • AWS A2.4 Welding and NDT Symbols
  • AWS A3.0 Terms and Definitions
To pass the CWI Exam, you will need to get 72% marks from Each Part.
Go to the AWS American Welding Society website, they have downloadable versions of Part B, and other aids.  Click Here to Downloads Free AWS CWI Books from American Welding Society online bookstore
There is lots of welding symbols questions, maybe 16. So know those cold. Lots of questions on welding processed, too.
You will have to know how to use a micrometer and dial caliper
Calculate cross sectional area of a round and rectangular piece.
Calculate ultimate tensile strength, elongation, and reduction in area using both US customary units as well as metric conversions.
The hard part will be to identify various weld discontinuities using plastic weld replicas and measure weld sizes, undercut, etc.
You will be provided with a "welding standard" that is a compilation of AWS D1.1, ASME Section IX, and a little API thrown in for good measure. The trick is to read the specification without allowing your day to day experience influence your decision on accepting or rejecting welds.  Use only the criteria listed in the specification.
I understand it used to be harder, with much more math. The one week immediately preceding the tests is invaluable. They really drum it into your head.
The AWS CWI Training Seminar is definitely worth it. And then the one week class AWS CWI gives right before the test is excellent.
There are three parts of tests involved, and they have to be completed in 2 hours each part. The first part is (Part A) General Knowledge and is 150 questions closed book.
The second part is Part B, The Part B is practical test. Part B is the accumulate welding standard GTAW referral. This is where most candidates who miss the test mess up. Part of the reason is the samples are pretty beat up and may confuse candidates. With the good preparation it will go well. Another part is if you have so many years of experience in inspecting, it may well work against you. As GTAW mentions, accept or reject based on the supplied test only. Some of the porosity is unbelievably huge, but depending on the criteria is acceptable.
The third is Part C, The Part C is your Code section. I tested with API 1104 (Welding of Pipelines and Related Facilities) and it sounds like you will be also. Both Part B and Part C is open book, so memorization of formulae won't be an issue.

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Monday, 20 March 2017

Q:- Solidification Cracking Occurs:

1. In the HAZ  
2. In the Parent Metal  
3. Use low Hydrogen Electrodes  
4. All of the Above 

Tuesday, 14 March 2017

Q:- When welding on construction site which type of power source would be considered to be the most unsafe:

1. 110Volt main machine  
2. 440Volt main machine  
3. Diesel engine driven welding generator process  
4. All welding hav the same safety factors

Monday, 6 March 2017

Q: - Would you consider using a 5mm electrode for vertical up root runs in a 6G (HL045) fixed position pipe?

1. Yes ,it is compatability  
2. Yes but this would depend upon the welder skill  
3. No,it is not the most suitable electrode coating type  
4. No, the electrode should have been smaller in diameter