Basic QAQC Interview Questions and answers For Quality Engineers

Instrumentation Inspection and Quality Control Questioner

QA vs QC – Difference between Quality Assurance and Quality Control

Quality Control Vs Quality Assurance- Difference Between QC and QA Opens in a new tab.

1. What is QA/QC?

QA/QC means, “Quality Assurance/Quality Control” the purpose of this (QA/QC) is to establish the sequence of requirement for the quality of material, quality of works, its inspection and records.

2. What are basic responsibilities of QA/QC personals?

To ensure execution of works and comply fully as per standard and approved specs.

3. What are the basic required documents for a QA/QC personal?

The basic required documents QA/QC personal are as following:
ITP: to conduct the Quality check (inspection/witness/surveillance) etc.
WP: standard procedure to execute the works. (Work Procedure)
P&ID: as a reference to ensure that the work is as per standard drawing.
MTC: To ensure that the material complies the PES standard specs.
PP: To ensure that the Instruments are installed as per P&ID and PP as per convenience.
IDS/ISS: To ensure that the instrument comply with the basic requirement.
RFI: To conduct the inspection of completed works. (Request for Inspection)
QR: To maintain the quality records of completed works etc.
QCO: To issue a warning in case of little violation and observation
NCR: To issue a warning in case of serious violation of standard. (Non Compliance Report)
Calibration Report: To ensure parameters are function checked as per IDS.
Hook Up: To ensure that the remote connection of pneumatic is done correctly.
Wiring Diagrams: To ensure that the wiring is done correctly.

4. What is NCR? Why does it need for a QA/QC personal?
NCR means Non‐Compliance Report, QA/QC personal has reserve the right to issue a warning if the contractor doesn’t comply or violate with the standard procedure.

5. What are the general work procedures (WP)?

The general sequence of activities will be as follows:
a) Receiving Drawing and Documents
b) Reproduction of Drawings
c) Issuing of Drawing to site
d) New‐Issuing New Revisions
e) Shredding of Drawings
f) Redlining Drawings
g) Transmittal of redlines to Client (As‐built)
h) Restricted access to the DCO
i) Work Permit prior to start the works
j) Record

6. What is redlining? Brief its color coding.

In case of any change occur to the standard approved drawing while the project is being constructed or tested the relevant drawing will be “redlined”. Following color coding shall be used for this purpose:

Red : If any addition required in the drawing.
Green : If any deletion is required from the drawing.
Blue : if any comment is added.

7. What are the difference between Inspection (Surveillance), witness and Hold point?

Inspection : Work can be execute without clients inspection and it can be Inspect some part of them if it required.
Witness : Work can be execute without client inspection and then it can be inspected upon the completion of work.
Hold Point : Work can’t be executed without client inspection.

8. What is ISO? Explain some of its standards?

ISO means International Standard Organization; some of them are as below: ISO: 9001, ISO: 9002, ISO: 9003 etc.

9. What are Zone classifications? Give a brief.

Zone classification is defining the area of hazards, they are as below;
Zone – 0: A zone in which explosions gas/air mixture is continuously present or present for extended periods, during normal operation.
Zone – 1: A zone in which explosions gas/air mixture is likely to occur in normal operation.
Zone – 2: A zone in which explosions gas/air mixture is not likely to occur in the normal operation and if it occurs, it will only exist for a short time.
Zone – 10: A zone in which explosive dust atmosphere is present continuously or for extended periods of time.
Zone – 11: A zone in which there is likelihood that explosive atmosphere may occur for short periods due to unsettled dust layers.

10. What are the standard heights to install the instruments?

A standard height to install the instruments is 1‐4 meters, but it can vary less or more as per location’s convenience.

11. What are the required documents for an inspection?

Following are the required documents for an inspection:
: RFI (Request for Inspection)
: P&ID for line inspection
: PP for location
: Wiring diagram for wiring details.
: Data Sheet for calibration and pressure test.
: Hook‐up etc. for remote tubing/air line
: QR for maintaining record.
: WP (Work Procedure) to check each and every step as per spec.
: QCO for issuing in case of little violation.
: NCR (Non Compliance Report) for issuing in case of major violation etc.

12. What are the primary elements for measuring pressure?

The primary elements for measuring pressure are:
1. Bourdon Tube
2. Diaphragm
3. Capsule
4. Bellows
5. Pressure Spring
The above are known as elastic deformation pressure elements.
1. Types of Bourdon Tubes.
1) ‘C’ Type.
2) Spiral
3) Helix
2. Diaphragm : The diaphragm is best suited for low pressure measurement
3. Capsules : Two circular diaphragm are welded together to form a pressure capsule. Material used: PHOSPHER BRONZE, NI‐SPONGE, STAINLESS STEEL
4. Bellows : Bellows is a one‐piece, collapsible, seamless metallic unit with deep folds formed from very thin walled tubing.
5. Pressure Spring : Pressure springs of helical or spiral shape are used for measuring high pressures.

13.Name the type of tests required for testing following cables:
• Medium voltage power cables – Megger test & DC High Potential test
• Catholic protection – Holiday test
• Low voltage cables – Megger test & continuity test.

14. Name some of the tests required for testing following equipment:
1. Oil type transformers – Winding test and Ratio test
2. Electrical Motors – Winding test, Resistance test, Megger test
3. Batteries – specific gravity, voltage, current
4. Circuit Breakers – Megger & Ductor test, primary current Trajection test

15. What is the NEMA rating for electrical enclosures installed in the following environments:
1. Indoor – NEMA – article – 250
2. Outdoor – 3R , 3CR4
3. Corrosive environment – 4X