Johnson Controls Senior Design Engineer Interview Questions, Process, and Tips

Q1. Pneumatic safety valves
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Q2. Ball screw selection
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Q3. Hydraulics and components used in hydraulics
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Hydraulics involve the use of fluids to transmit power in mechanical systems, with components like pumps, cylinders, valves, and hoses.
• Hydraulics use incompressible fluids to transmit power

• Components include pumps to generate fluid flow, cylinders to convert fluid power into mechanical power, valves to control flow direction, and hoses to connect components

• Common examples include hydraulic systems in heavy machinery, a
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Q4. Projects in the previous company
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Q5. What did you learn in your 1st and 2nd company
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Q1. No questions, direct salary discussion and early joining
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General questions regarding current events mathematical logical questions etc

Q1. What is tolerance stack up & what is IT grades?
Ans. 
Tolerance stack up is the accumulation of variations in dimensions and tolerances in a product design. IT grades are international standards for tolerances.
• Tolerance stack up occurs when the cumulative effect of individual part tolerances results in a deviation from the intended design.

• IT grades, such as IT01, IT0, IT1, etc., are used to specify the level of tolerance allowed for a particular dimension or feature.

• Under...read more
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Q2. Calculations based on pneumatics and hydraulic selection etc.
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Q3. What is anti friction bearings explain.
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Anti-friction bearings are designed to reduce friction between moving parts, allowing for smooth and efficient operation.
• Anti-friction bearings use rolling elements (such as balls or rollers) to reduce friction between two surfaces in contact.

• They are commonly used in machinery and equipment to support rotating or linear motion.

• Examples include ball bearings, roller bearings, and needle bearings.

• These bearings are desi...read more
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Q4. What is type of splines?
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Splines are mechanical components used to transfer torque between two rotating objects while allowing for slight misalignment or movement.
• Splines are used in mechanical engineering to transfer torque between shafts or other rotating components.

• There are different types of splines including involute, straight-sided, and serrated splines.

• Splines allow for slight misalignment or movement between the connected components w
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Q5. What is PU and PTFE explain
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PU stands for polyurethane, a versatile polymer used in various applications. PTFE stands for polytetrafluoroethylene, a synthetic fluoropolymer known for its non-stick properties.
• PU is a type of polymer that can be rigid or flexible, commonly used in foam insulation, coatings, adhesives, and sealants.

• PTFE is a synthetic fluoropolymer with high heat resistance and low friction, often used in non-stick cookware, gaskets
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Q1. HOW TO CALCULATE CT CURRENT
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CT current can be calculated by dividing the primary current by the turns ratio of the current transformer.
• CT current = Primary current / Turns ratio

• Primary current is the current flowing through the primary conductor

• Turns ratio is the ratio of the number of turns in the primary winding to the number of turns in the secondary winding
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Q2. WHAT IS LOCKOUT REALY
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Lockout is a safety procedure used to ensure that machinery or equipment is properly shut off and cannot be restarted until maintenance or servicing is completed.
• Lockout involves isolating energy sources to prevent accidental startup.

• Lockout devices like padlocks and tags are used to physically lock equipment.

• Lockout procedures must be followed to prevent accidents and injuries.

• Examples of lockout include locking out e...read more
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Q3. WHAT IS IP65 FOR PANEL
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IP65 for panel refers to the level of protection against dust and water ingress.
• IP65 rating means the panel is dust tight and protected against water jets from any direction.

• The first digit '6' indicates the level of protection against solid objects like dust.

• The second digit '5' indicates the level of protection against water ingress.

• Commonly used in outdoor or industrial applications where the panel may be exposed to...read more
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Q4. What is TCS AND MASTER TRIP REALY
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TCS and Master Trip Relay are protective devices used in electrical systems to prevent damage during faults.
• TCS stands for Time Current Characteristic Relay, which operates based on the relationship between time and current to trip the circuit breaker during faults.

• Master Trip Relay is a relay that receives signals from various protective relays and initiates a trip signal to disconnect the circuit in case of a fault.

• B...read more
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Q5. WHAT IS LSC 2A AND LSC 2B
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LSC 2A and LSC 2B are standards for lighting in commercial and industrial buildings.
• LSC 2A and LSC 2B are part of the Lighting Power Density (LPD) requirements in building codes.

• LSC 2A is for commercial buildings while LSC 2B is for industrial buildings.

• They specify the maximum allowable power consumption for lighting per unit area in a building.

• For example, LSC 2A may require a maximum LPD of 0.9 watts per square foot
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Q6. What REF PROTECTION and HIgh impedance and low impedance
Ans. 
REF protection is used to prevent damage to equipment from electrical faults. High impedance protection is used for sensitive equipment, while low impedance protection is used for power systems.
• REF protection is used to detect ground faults and prevent damage to equipment.

• High impedance protection is used for sensitive equipment that requires high accuracy and low fault currents.

• Low impedance protection is used for pow...read more
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Q7. ANSI CODE FOR VERIOUS PROTECTION
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ANSI codes are used to identify various types of protection devices in electrical systems.
• ANSI code 50/51 is for instantaneous overcurrent protection

• ANSI code 67 is for directional power protection

• ANSI code 87 is for differential protection

• ANSI code 59 is for overvoltage protection
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Q1. I have been using blender for the past 2 years, so they asked how would I learn their 3d Software, i.e., 3Ds Max
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Making an animated clip from a reference video provided.

Q1. How would I adjust here in acooperate coming from a gaming background with no real work overlap.
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Q1. Questions about my process and skills in 3D modelling and Animation.
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