Cummins Design Engineer Interview Questions and Answers

Q1. HOW TO CALCULATE CT CURRENT
Ans. 
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
Ans. 
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. Refrigeration related questions
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Q2. Stress and strain
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Q3. Free body diagram of beam
Ans. 
A free body diagram of a beam shows all external forces acting on the beam.
• Identify all external forces acting on the beam such as gravity, applied loads, and reactions at supports.

• Draw a simple sketch of the beam with arrows representing the direction and magnitude of each force.

• Label each force with appropriate symbols or letters for clarity.

• Ensure that the forces are correctly positioned and oriented relative to the
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Q1. What is positive displacement and negative dispalcement pump?
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Positive displacement pumps move fluid by trapping a fixed amount and forcing it through the discharge pipe. Negative displacement pumps move fluid by creating a vacuum to draw in and push out the fluid.
• Positive displacement pumps trap a fixed amount of fluid and force it through the discharge pipe

• Examples include gear pumps, piston pumps, and diaphragm pumps

• Negative displacement pumps create a vacuum to draw in and pu...read more
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Q2. What material is used for casing?why?
Ans. 
The material used for casing is typically chosen based on factors such as durability, weight, cost, and aesthetics.
• Common materials for casing include plastic, aluminum, steel, and carbon fiber.

• Plastic is often used for its lightweight properties and cost-effectiveness.

• Aluminum is chosen for its strength-to-weight ratio and corrosion resistance.

• Steel is preferred for its durability and impact resistance.

• Carbon fiber is...read more
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Q1. Role responsibility,
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Q1. Tool test, on NX
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60 marks
30 marks aptitude
30 marks mechanical mainly kinematics

Topic related to life without mobile

Q1. Related to our curriculum project , welding and casting.
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Q1. Tell me about yourself Family background Hobbies
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