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Atlas Copco Design Engineer Interview Questions and Answers

Updated 12 Jun 2024

Q1. What is synchronous speed of motor?

Ans.

Synchronous speed of a motor is the speed at which the rotating magnetic field produced by the stator rotates.

  • It is determined by the number of poles and frequency of the power supply.

  • It is the speed at which the motor would run if there was no load or slip.

  • It is expressed in revolutions per minute (RPM).

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Q2. Under which stress spring fails?

Ans.

A spring fails under stress beyond its elastic limit.

  • A spring fails when it is subjected to stress beyond its elastic limit.

  • The elastic limit is the maximum stress a spring can withstand without permanent deformation.

  • Factors affecting the failure of a spring include material properties, design, and operating conditions.

  • Examples of spring failure include fracture, fatigue, and creep.

  • Fracture occurs when the spring is subjected to stress beyond its ultimate strength.

  • Fatigue fai...read more

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Atlas Copco Design Engineer Interview Questions and Answers for Freshers
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Q3. Sub-type or specific failure stress for springs

Ans.

Sub-type or specific failure stress for springs can include yield stress, ultimate tensile stress, fatigue stress, etc.

  • Different types of springs may have different failure stresses

  • Yield stress is the point at which a material begins to deform plastically

  • Ultimate tensile stress is the maximum stress a material can withstand before failure

  • Fatigue stress is the stress level at which a material fails after repeated loading cycles

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Q4. Types of stresses and examples of each

Ans.

Types of stresses include tensile, compressive, shear, bending, and torsional.

  • Tensile stress: pulling force that stretches material apart (e.g. stretching a rubber band)

  • Compressive stress: pushing force that squeezes material together (e.g. pressing on a spring)

  • Shear stress: force that causes layers of material to slide past each other (e.g. cutting paper with scissors)

  • Bending stress: combination of tensile and compressive stresses on opposite sides of a material (e.g. bendin...read more

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Q5. Difference between stress and pressure

Ans.

Stress is internal resistance to deformation, while pressure is force applied over an area.

  • Stress is a measure of the internal resistance of a material to deformation under an applied force.

  • Pressure is the force applied perpendicular to the surface of an object per unit area.

  • Stress is a tensor quantity, while pressure is a scalar quantity.

  • Examples: A rubber band under tension experiences stress, while a balloon filled with air exerts pressure on its walls.

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Q6. Synchronous speed defination and formula

Ans.

Synchronous speed is the speed at which the magnetic field rotates in a synchronous motor.

  • Synchronous speed is determined by the frequency of the power supply and the number of poles in the motor.

  • Formula for synchronous speed: Ns = 120f / P, where Ns is synchronous speed in RPM, f is frequency in Hz, and P is number of poles.

  • For example, a 4-pole motor connected to a 60 Hz power supply would have a synchronous speed of 1800 RPM.

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Q7. Different units of pressure

Ans.

Units of pressure include pascal, bar, atmosphere, and psi.

  • Pascal (Pa) is the SI unit of pressure

  • Bar is commonly used in meteorology and scuba diving

  • Atmosphere (atm) is the average pressure at sea level on Earth

  • Pounds per square inch (psi) is used in engineering and automotive industries

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Q8. Failure stress for spring

Ans.

Failure stress for spring is the maximum stress a spring can withstand before permanent deformation or breakage.

  • Failure stress is determined by the material properties of the spring.

  • Factors affecting failure stress include material type, manufacturing process, and design considerations.

  • Examples of failure stress for springs include tensile strength, yield strength, and ultimate strength.

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Interview Process at Atlas Copco Design Engineer

based on 7 interviews
2 Interview rounds
Technical Round - 1
Technical Round - 2
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