PCBL Chemical Limited Interview Questions, Process, and Tips

Q1. Equipment Maintenance Team Managing work
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Q2. Vehicle and tunnel machine related
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Q1. How pumps work?
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Pumps are devices that use mechanical action to move fluids from one place to another.
• Pumps work by creating a pressure difference to push fluids through a system.

• They typically consist of an inlet, an outlet, and an impeller or rotor.

• The impeller rotates, creating centrifugal force that pushes the fluid outwards.

• Positive displacement pumps use reciprocating or rotary motion to move fluid in discrete volumes.

• Examples o...read more
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Q2. Draw Stress Strain graph
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A stress-strain graph shows the relationship between stress and strain in a material.
• The graph typically has stress on the y-axis and strain on the x-axis.

• It starts with a linear elastic region where stress is directly proportional to strain.

• Beyond the elastic limit, the material enters the plastic region where permanent deformation occurs.

• The graph may show a yield point, ultimate tensile strength, and fracture point.

• ...read more
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30 MIN OF BASIC APTITUDE TEST

Q1. GO WITH SOME RESEARCH OF PRODUCT
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Q1. Generator protection
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Q2. Transformer maintenance
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Q1. What is carbon black
Ans. 
Carbon black is a fine powder made from incomplete combustion of hydrocarbons.
• It is used as a reinforcing filler in rubber products.

• It is also used as a black pigment in inks, paints, and plastics.

• Carbon black is produced by burning petroleum oil or natural gas.

• It is a common ingredient in tires, conveyor belts, and other industrial rubber products.
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Q2. What is Air preheater
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Air preheater is a device used to heat the air before it enters the combustion chamber of a boiler.
• It improves the efficiency of the boiler by recovering waste heat from the flue gas.

• It reduces fuel consumption and emissions.

• There are two types of air preheaters: recuperative and regenerative.

• Recuperative air preheaters use a heat exchanger to transfer heat from the flue gas to the incoming air.

• Regenerative air preheat...read more
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Q1. Process of carbon black
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Carbon black is a fine black powder used as a pigment and reinforcing agent in rubber and plastic products.
• Carbon black is produced by incomplete combustion of heavy petroleum products.

• It is used in tires, ink, paint, and various other products for its coloring and reinforcing properties.

• The process involves burning hydrocarbons in a limited air supply to produce carbon black particles.

• The particles are then collected ...read more
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Q2. Previous plant related questions
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Q3. Soda ash process
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