Lab Analyst Interview Questions and Answers

GC separates and analyzes volatile compounds, while NMR detects the magnetic properties of atomic nuclei.

• GC uses a sample injection port, a column, and a detector to separate and analyze volatile compounds based on their boiling points and affinity for the column material.

• NMR uses a strong magnetic field and radio waves to detect the magnetic properties of atomic nuclei, providing information about the chemical structure and composition of a sample.

• GC is commonly used in the ...read more

I would consult with colleagues, review any available documentation, and conduct tests to identify the contents before discarding them.

• Consult with colleagues to see if anyone recognizes the contents

• Review any available documentation or records that may provide clues

• Conduct tests or analysis to identify the contents before discarding

• If unsure, consult with a supervisor or manager for guidance

Bitumen is extracted from oil sands through mining or in-situ methods. It has two types - natural and petroleum bitumen.

• Bitumen is extracted from oil sands through mining or in-situ methods

• Natural bitumen is found in oil sands and is a thick, sticky form of petroleum

• Petroleum bitumen is a residue from the distillation of crude oil

• Petroleum bitumen is further classified into paving grade, industrial grade, and oxidized bitumen

Potentiometer is a device used to measure potential difference by comparing it with a known voltage.

• Potentiometer works on the principle of balancing the unknown voltage with a known voltage.

• It consists of a long resistive wire with a sliding contact called a wiper.

• The wiper is moved along the wire to find the point where the potential difference is zero.

• Potentiometers are used in various applications such as volume control in audio systems and as a variable resistor in elect...read more

A lubricity machine measures the friction and wear properties of lubricants.

• The machine applies a load to a test specimen while it is in contact with the lubricant being tested.

• The test specimen is typically a metal ball or pin.

• The machine measures the force required to move the test specimen and calculates the coefficient of friction.

• The machine can also measure the wear scar diameter on the test specimen after the test is complete.

• Lubricity machines are commonly used in the...read more

Principle of testing involves following standardized procedures to ensure accurate and reliable results.

• Testing should be based on established protocols and standards

• Proper controls should be in place to ensure accuracy

• Results should be reproducible and consistent

• Quality assurance measures should be implemented to maintain reliability

• Examples: following ASTM standards for material testing, using control samples in medical testing