Sanmar Group Mechanical Graduate Engineer Trainee Interview Questions and Answers

Domain based questions and basic aptitude question

Q1. About distillation column, basic questions ,cooling tower concept.
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Q2. Difference between CSTR and PFR, Pumps ,Heat Exchanger.
Ans. 
CSTR and PFR are types of reactors, pumps are used to move fluids, heat exchangers transfer heat between fluids.
• CSTR (Continuous Stirred Tank Reactor) has a constant volume and operates under steady-state conditions.

• PFR (Plug Flow Reactor) has a varying volume and operates under unsteady-state conditions.

• Pumps are mechanical devices used to move fluids from one place to another, like centrifugal pumps or positive displ...read more
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Q3. What is cracking
Ans. 
Cracking is a process in which complex hydrocarbon molecules are broken down into simpler molecules.
• Cracking is a refining process used to convert large hydrocarbon molecules into smaller, more valuable ones.

• It is done by breaking the carbon-carbon bonds in the molecules.

• Examples include catalytic cracking and steam cracking.
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Q4. What is Reforming
Ans. 
Reforming is a process used in the petroleum industry to convert low-octane naphtha into high-octane gasoline.
• Reforming involves rearranging the molecular structure of hydrocarbons to increase their octane rating.

• It is typically done using a catalyst at high temperatures and pressures.

• The process can also produce hydrogen gas as a byproduct.

• Reforming is an important step in the production of gasoline and other fuels in...read more
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Q5. What is range and approach of cooling tower
Ans. 
The range of a cooling tower refers to the maximum distance at which it can effectively cool air, while the approach is the temperature difference between the cooled water and the entering air.
• Range of a cooling tower is typically around 5-20 degrees Fahrenheit

• Approach of a cooling tower is usually around 8-15 degrees Fahrenheit

• The range and approach of a cooling tower can vary based on factors such as design, size, an
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The same way to do it u r right now is

Q1. Which is your favorite subject
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Q2. Draw a process sheet for a particular product
Ans. 
Process sheet for manufacturing a plastic water bottle
• Step 1: Injection molding to create the bottle shape

• Step 2: Cooling and solidifying the plastic

• Step 3: Trimming excess plastic from the bottle

• Step 4: Adding a cap and seal to the bottle

• Step 5: Quality control inspection

• Step 6: Packaging and labeling the finished product
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Q3. Difference between jigs and fixtures
Ans. 
Jigs are used to guide cutting tools and fixtures hold workpieces in place during machining operations.
• Jigs guide cutting tools to ensure accurate and consistent cuts

• Fixtures hold workpieces securely in place during machining operations

• Jigs are often used in drilling, tapping, and reaming operations

• Fixtures are commonly used in milling, grinding, and turning processes
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Q4. Define limits fits tolerance
Ans. 
Limits fits tolerance refer to the range of acceptable dimensions in manufacturing to ensure proper fit and function of parts.
• Limits: Maximum and minimum acceptable dimensions for a part

• Fits: Relationship between mating parts to ensure proper assembly

• Tolerance: Allowable deviation from a specified dimension

• Example: A shaft with a diameter of 25mm may have a tolerance of +/- 0.1mm for proper fit with a hole of 25.1mm
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Q5. Accuracy and precision
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Q1. What is heat transfer
Ans. 
Heat transfer is the process of energy moving from a warmer object to a cooler object.
• Heat transfer can occur through conduction, convection, or radiation.

• Conduction is the transfer of heat through direct contact between objects.

• Convection is the transfer of heat through the movement of fluids or gases.

• Radiation is the transfer of heat through electromagnetic waves.

• Examples include a metal spoon getting hot when placed...read more
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Q2. What is mass transfer
Ans. 
Mass transfer is the movement of substances from one place to another.
• Mass transfer involves the movement of molecules or particles from one phase to another, such as from a liquid to a gas.

• It is important in processes like distillation, absorption, and extraction.

• Mass transfer can be enhanced by factors like temperature, concentration gradients, and surface area.

• Examples include the transfer of oxygen from air to bloo...read more
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Very easy question but time is not more.

1st Introduction.
2nd Project
3rd Favourite Subject
4th Technical Questions
5th General knowledge
6th Hr round

I am selected in 1st round ,so 2nd time Interview for Technical + Hr