Air Liquide Interview Questions and Answers for Freshers

Normal maths ,time and work questions

Q1. Instrument transformer, current transformer, power flow questions and basic electrical
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Q1. Toll and Technical
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Written aptitude test was taken. Difficulty level was moderate. Negative marking was there.

Q1. Draw the Oxygen atomic structure
Ans. 
Oxygen has 8 protons, 8 neutrons, and 8 electrons arranged in its atomic structure.
• Oxygen has an atomic number of 8, which means it has 8 protons.

• The atomic mass of Oxygen is approximately 16, so it has 8 neutrons.

• Oxygen has 8 electrons distributed in 2 electron shells, with 2 in the first shell and 6 in the second shell.
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Q2. Tell about specific density?
Ans. 
Specific density is the ratio of the density of a substance to the density of a reference substance.
• Specific density is a dimensionless quantity.

• It is calculated by dividing the density of the substance by the density of the reference substance.

• Common reference substances for specific density include water and air.

• Specific density is used in various fields such as engineering, physics, and chemistry.
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Q1. Types of cryogenic valves .
Ans. 
Cryogenic valves control the flow of fluids at extremely low temperatures, essential in various applications like LNG and superconductors.
• 1. Globe Valves: Used for precise flow control; suitable for cryogenic applications.

• 2. Ball Valves: Provide quick shut-off; often used in LNG systems.

• 3. Gate Valves: Ideal for on/off control; less common in cryogenic applications.

• 4. Check Valves: Prevent backflow; essential in cryoge...read more
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Q2. Types of transmitter.
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Transmitters convert physical signals into standardized output for measurement and control in various applications.
• 1. Pressure Transmitters: Measure pressure in liquids and gases (e.g., piezoresistive transmitters).

• 2. Temperature Transmitters: Convert temperature readings into standardized signals (e.g., RTD transmitters).

• 3. Level Transmitters: Measure the level of liquids or solids (e.g., ultrasonic level transmitters...read more
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Q3. Types of Analyser
Ans. 
Analyzers are instruments used to measure and analyze physical or chemical properties in various applications.
• Gas analyzers: Measure the concentration of gases (e.g., CO2 analyzers).

• Liquid analyzers: Assess properties of liquids (e.g., pH meters).

• Spectrometers: Analyze light spectra to identify materials (e.g., UV-Vis spectrometers).

• Mass spectrometers: Determine mass-to-charge ratios of ions (e.g., used in chemical ana...read more
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