Nibe Defence Interview Questions and Answers

It has three sections basic aptitude only

Q1. What are the forces acting on a rocket?
Ans. 
Forces acting on a rocket include thrust, weight, drag, and lift.
• Thrust is the force propelling the rocket forward.

• Weight is the force pulling the rocket down due to gravity.

• Drag is the resistance force acting opposite to the rocket's motion.

• Lift is the aerodynamic force generated by the rocket's shape to counteract weight.

• Other forces may include gravity, air resistance, and external forces.
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Q2. Explain Stress strain curve
Ans. 
Stress strain curve shows the relationship between stress (force applied) and strain (resulting deformation) in a material.
• Stress strain curve is a graphical representation of how a material behaves under loading.

• It typically shows the stress on the y-axis and strain on the x-axis.

• The curve usually consists of three main regions: elastic deformation, plastic deformation, and fracture.

• Elastic deformation is the initial ...read more
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Q3. Modes of heat transfer
Ans. 
Modes of heat transfer include conduction, convection, and radiation.
• Conduction: Heat transfer through direct contact between particles or objects (e.g. touching a hot pan)

• Convection: Heat transfer through the movement of fluids or gases (e.g. boiling water)

• Radiation: Heat transfer through electromagnetic waves (e.g. feeling the warmth of the sun)
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Q4. What is viscosity
Ans. 
Viscosity is a measure of a fluid's resistance to flow.
• Viscosity is often described as the thickness or stickiness of a fluid.

• It is influenced by factors such as temperature and pressure.

• High viscosity fluids flow slowly, while low viscosity fluids flow quickly.

• Examples of high viscosity fluids include honey and molasses, while water has low viscosity.
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Q5. Difference between ductile and brittle material using stress strain curve
Ans. 
Ductile materials exhibit large deformation before failure, while brittle materials fail suddenly without significant deformation.
• Ductile materials show a gradual increase in stress followed by necking before failure.

• Brittle materials have a steep stress-strain curve and fail abruptly without warning.

• Examples of ductile materials include metals like copper and aluminum.

• Examples of brittle materials include ceramics and
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I joined as GET and aptitude test was seemed easy.

Q1. What is your favorite subject?
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Q2. What is critical speed?
Ans. 
Critical speed is the speed at which a rotating object experiences resonance and begins to vibrate uncontrollably.
• It is the speed at which the natural frequency of the object matches the frequency of its rotation.

• It can cause damage to the object and surrounding equipment.

• It is important to calculate critical speed in order to avoid resonance and vibration issues.

• Examples include turbine rotors, drive shafts, and centr
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Q3. How do u design a shaft?
Ans. 
Designing a shaft involves determining its dimensions, material, and manufacturing process.
• Determine the required torque and power to be transmitted

• Select appropriate material based on strength, weight, and cost

• Calculate the shaft diameter and length based on the torque and bending stress

• Choose a manufacturing process such as forging, casting, or machining

• Consider factors such as surface finish, tolerances, and heat tr...read more
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Q4. Which one is better for good weight to strength ratio? Hollow or solid?
Ans. 
Hollow structures have a better weight to strength ratio than solid structures.
• Hollow structures are lighter than solid structures of the same material and size.

• Hollow structures distribute weight more evenly, reducing stress points.

• Hollow structures are often used in aerospace and automotive industries for their weight-saving properties.

• Solid structures may be stronger in certain applications, such as load-bearing col
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Q5. What is equation of Castigliano's theorem?
Ans. 
Castigliano's theorem relates the partial derivative of the strain energy to the applied loads.
• Castigliano's theorem is used to determine the deflection of a structure under a given load.

• It is based on the principle of minimum potential energy.

• The theorem states that the partial derivative of the strain energy with respect to a force is equal to the displacement caused by that force.

• It can be used to solve for unknown ...read more
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Q1. Are you ready to relocate across India?
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Aptitude, verbal, questions on op-amps

Q1. Tell me about yourself explain your project asked some questions based on our project favorite subject (questions based on that subject)
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Q1. About your previous work
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Q2. About core technical
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Q1. General review of previous interview
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Q1. About your personal and the you are presenting
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Q1. It was purely technical based on my domain experience.
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Q1. It was technical plus HR kind of interview by my hiring manager.
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Q1. Tell me about Self introduce yourself?
Ans. 
I am a motivated and enthusiastic individual with a strong educational background and a passion for learning and professional growth.
• Start by stating your name and current educational background.

• Highlight any relevant work experience or internships.

• Mention your key skills and strengths.

• Discuss your career goals and aspirations.

• Conclude by expressing your enthusiasm for the opportunity and your willingness to contribute
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Q2. Any previous experience?
Ans. 
Yes, I have previous experience in a similar role as a Graduate Apprentice.
• I have worked as a Graduate Apprentice at XYZ Company for 6 months.

• During my apprenticeship, I gained hands-on experience in various aspects of the job.

• I successfully completed projects and tasks assigned to me, demonstrating my skills and abilities.

• I received positive feedback from my supervisors and colleagues for my performance.

• I also activel...read more
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