Martin & Harris Interview Questions, Process, and Tips

Q1. Which types of process in API handling or intermediate product, do you know nature of reaction..etc
Ans. 
Various types of processes in API handling or intermediate product include synthesis, purification, isolation, and characterization.
• Synthesis reactions involve combining reactants to form a desired product.

• Purification processes remove impurities from the product.

• Isolation techniques separate the desired product from the reaction mixture.

• Characterization methods analyze the chemical and physical properties of the produ...read more
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Q2. Operation of SSR reactor,GLR,CF,RCVD,VTD , pressure filter...and how to cleaning process because batch manufacturing process in this company is maximum
Ans. 
Operation and cleaning process of various equipment used in batch manufacturing process.
• SSR reactor: Operate by setting desired temperature and pressure, clean by flushing with appropriate solvent.

• GLR: Operate by controlling temperature and pressure, clean by rinsing with water and detergent.

• CF: Operate by adjusting flow rate and pressure, clean by backwashing with clean water.

• RCVD: Operate by controlling temperature a...read more
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Q3. I know everything process in API or intermediate handling.
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Q4. Cleaning procedure reactor is more important because batch manufacturing
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Q1. What is chiller approach
Ans. 
Chiller approach refers to the temperature difference between the chilled water and the air entering the cooling coil.
• The approach is calculated as the difference between the leaving chilled water temperature and the entering air temperature.

• A typical chiller approach might be around 10°F, indicating efficient cooling.

• Lower approach temperatures can indicate better chiller performance and efficiency.

• For example, if the...read more
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Q2. Types of differential pressure.
Ans. 
Differential pressure measures the difference in pressure between two points, crucial for HVAC system efficiency.
• Static Pressure: Pressure exerted by air in a duct when it is not moving. Example: Measuring static pressure in ductwork.

• Dynamic Pressure: Pressure of moving air, calculated based on velocity. Example: Measuring airflow speed in a vent.

• Total Pressure: Sum of static and dynamic pressure. Example: Used in fan ...read more
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Q3. Types of ac refrigerant.
Ans. 
AC refrigerants are substances used in cooling systems to absorb and release heat, crucial for efficient air conditioning.
• R-22: A common refrigerant, known as HCFC, being phased out due to environmental concerns.

• R-410A: A popular HFC refrigerant, more efficient and environmentally friendly than R-22.

• R-134A: Used in automotive and some residential systems, it's a hydrofluorocarbon with low ozone depletion potential.

• R-32...read more
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Q4. Types of validation
Ans. 
Validation ensures HVAC systems meet performance standards and safety regulations.
• Design Validation: Ensures system design meets specifications, e.g., load calculations.

• Installation Validation: Confirms proper installation, e.g., checking ductwork for leaks.

• Performance Validation: Tests system efficiency, e.g., measuring airflow and temperature.

• Regulatory Validation: Ensures compliance with local codes, e.g., safety in
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Q5. Types of compressor..
Ans. 
Compressors are vital components in HVAC systems, converting low-pressure gas into high-pressure gas for cooling and heating.
• Reciprocating Compressors: Use pistons to compress refrigerant; common in residential systems.

• Scroll Compressors: Feature two spiral elements; known for efficiency and quiet operation.

• Rotary Compressors: Utilize rotating mechanisms; often found in window and portable AC units.

• Screw Compressors: U...read more
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Q6. What is work of cooling tower stainer.
Ans. 
A cooling tower strainer filters debris from water, ensuring efficient heat exchange and system longevity.
• Prevents clogging of cooling tower components, enhancing performance.

• Reduces maintenance costs by minimizing system wear and tear.

• Improves water quality by filtering out sediments and algae.

• Example: A strainer can capture leaves and dirt before they enter the cooling system.
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Q7. What is work of expenxion Wall
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Q8. Type of chillers
Ans. 
Chillers are refrigeration systems that remove heat from a liquid via vapor-compression or absorption refrigeration cycles.
• Air-Cooled Chillers: Use air to dissipate heat; ideal for smaller applications.

• Water-Cooled Chillers: Use water for heat exchange; more efficient for larger systems.

• Absorption Chillers: Use heat sources like natural gas or steam; suitable for specific industrial applications.

• Centrifugal Chillers: H...read more
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Q9. What is work of vcd.
Ans. 
VCD, or Variable Control Device, regulates airflow in HVAC systems for efficiency and comfort.
• VCDs adjust the volume of air flowing through ducts based on demand.

• They help maintain consistent temperatures in different zones of a building.

• For example, in a multi-story building, VCDs can direct more air to upper floors during summer.

• They improve energy efficiency by reducing unnecessary airflow, leading to lower utility ...read more
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Q10. Types of filter
Ans. 
HVAC filters improve air quality by trapping dust, allergens, and pollutants, ensuring efficient system operation.
• HEPA Filters: High-efficiency particulate air filters that capture 99.97% of particles as small as 0.3 microns.

• Fiberglass Filters: Economical filters that trap larger particles but may not be as effective for smaller allergens.

• Pleated Filters: Made of polyester or cotton, these filters have a larger surface...read more
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Q11. What is cyclo mester
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Q12. What is hp and lp
Ans. 
HP (high pressure) and LP (low pressure) refer to pressure levels in HVAC systems, crucial for efficient operation.
• HP is typically found in the refrigerant lines of a system, indicating areas where the refrigerant is compressed.

• LP is found in the evaporator side, where the refrigerant absorbs heat and evaporates.

• For example, in a split system, the compressor operates at HP while the evaporator operates at LP.

• Understand...read more
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Q1. How many types of vacuum pump are there
Ans. 
There are two main types of vacuum pumps: gas transfer pumps and entrapment pumps.
• Gas transfer pumps: move gas molecules through the pump using positive displacement or momentum transfer (e.g. rotary vane pump, diaphragm pump)

• Entrapment pumps: capture gas molecules by adsorption or condensation on a solid surface (e.g. cryopump, ion pump)
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Q2. How centrifuge pump work
Ans. 
Centrifuge pumps work by using centrifugal force to move fluids through the pump.
• Centrifuge pumps use a rotating impeller to create centrifugal force, which pushes the fluid towards the outlet.

• The fluid enters the pump through the suction port and is accelerated by the impeller.

• As the fluid moves through the pump, the centrifugal force increases its velocity and pressure, allowing it to be discharged through the outlet...read more
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Q1. Regulatory requirements
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