GHCL Limited 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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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. Introduce yourself and Also tell about your Family background
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Q2. What are your hobbies you pursue apart from academics
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Q3. Tell me something about your Internship experience and what all have you learnt there
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1. Quantitative aptitude
2. Verbal and Reasoning Test

Q1. Tell me about yourself and Family background
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Q2. Tell me what all have you learnt in academics which help you in internship
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Q3. Tell me about yourself start from your graduation and also about your family
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Q4. What do you understand from the word Work life balance?
Ans. 
Work life balance refers to maintaining a healthy equilibrium between one's professional responsibilities and personal life.
• Work life balance involves prioritizing tasks and setting boundaries between work and personal life.

• It is important to manage time effectively to avoid burnout and maintain overall well-being.

• Examples of achieving work life balance include setting specific work hours, taking regular breaks, and en...read more
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Q5. Tell me about your experience in internship?
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Q1. Tell me something about yourself
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Q2. What is your favorite subject what is your long term and short term goals
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India 2022

Q1. What are your strengths and weaknesses?
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Q2. Tell me about yourself.
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