Rothenberger India Graduate Trainee Interview Questions and Answers

It consists of 2 sections reasoning and core.

Q1. What are SFD and BMD
Ans. 
SFD stands for Shear Force Diagram and BMD stands for Bending Moment Diagram.
• SFD and BMD are graphical representations of the internal forces and moments in a structural element.

• SFD shows the variation of shear force along the length of the element.

• BMD shows the variation of bending moment along the length of the element.

• These diagrams are commonly used in structural analysis and design.

• They help engineers understand t...read more
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Q2. Explain about different types of modes of heat transfer
Ans. 
There are three modes of heat transfer: conduction, convection, and radiation.
• Conduction is the transfer of heat through direct contact between objects or substances.

• Convection is the transfer of heat through the movement of fluids or gases.

• Radiation is the transfer of heat through electromagnetic waves.

• Examples of conduction include touching a hot stove or holding a metal spoon in hot soup.

• Examples of convection inclu...read more
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Q3. About Mohr circle
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Q4. Thermodynamic laws
Ans. 
Thermodynamic laws govern the behavior of energy in systems.
• The first law of thermodynamics states that energy cannot be created or destroyed, only transferred or transformed.

• The second law of thermodynamics states that the entropy of an isolated system always increases over time.

• The third law of thermodynamics states that as the temperature approaches absolute zero, the entropy of a system approaches a minimum value.
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Q5. Different types of Compressors
Ans. 
Compressors are devices that increase the pressure of a gas or vapor.
• Positive Displacement Compressors: Piston, Rotary, Screw

• Dynamic Compressors: Centrifugal, Axial

• Reciprocating Compressors: Single-acting, Double-acting

• Rotary Compressors: Vane, Scroll, Lobe

• Centrifugal Compressors: Radial, Mixed flow, Axial flow
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Easy aptitude test with basic questions

Q1. SFD and BMD of frames
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Q2. Footing design and beam design
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Q1. Personal goals you want to acheive
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It was very iq based inclined test

Q1. Questions related to core mechanical field
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Q1. Basic information about future
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Was easy though , simple and general topics

General coding basics questions such as palindrome,binary search

Q1. Tell me about your self
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Q2. Tell about your school life
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1st section: numerical aptitude
2nd section: core questions
3rd section: situation reaction questions

30 min group discussion with 2 topics
1st topic: agneepath scheme
2nd scheme: influence of indian cinemas in the crimerates

Q1. Both hr and technical wwere combined
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Q2. . different forces acting on a moving cycle and force analysis . newtonian and non newtonian fluids .why tyres are made of rubber and not steel
Ans. 
Forces acting on a moving cycle, Newtonian vs non-Newtonian fluids, and why tires are made of rubber.
• Forces on a moving cycle include friction, air resistance, and gravity.

• Newtonian fluids have constant viscosity, while non-Newtonian fluids change viscosity with stress.

• Tires are made of rubber for flexibility, grip, and shock absorption.

• Rubber tires provide better traction and a smoother ride compared to steel tires.
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Q3. Howadiabatic and constant volume processes are achieved in practical
Ans. 
Adiabatic and constant volume processes are achieved in practical by controlling heat transfer and volume change respectively.
• Adiabatic process is achieved by insulating the system to prevent heat transfer with the surroundings.

• Constant volume process is achieved by using a closed container where the volume remains constant during the process.

• Examples include adiabatic compression in a gas turbine engine and constant v
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Q4. Why priming is neede in the pumps
Ans. 
Priming is needed in pumps to remove air and create a vacuum, ensuring proper functioning and preventing damage.
• Priming removes air from the pump, allowing it to create a vacuum and start pumping efficiently.

• It helps prevent cavitation, which can damage the pump by causing vibrations and erosion.

• Priming is essential for self-priming pumps to start pumping without manual intervention.

• Examples of priming methods include ...read more
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Q5. What is NPSH of pumps
Ans. 
NPSH stands for Net Positive Suction Head, it is a measure of the pressure available at the suction port of a pump.
• NPSH is important for determining if a pump will operate properly without cavitation.

• It is calculated by subtracting the vapor pressure of the liquid being pumped from the total suction head of the pump.

• NPSH is typically provided by the pump manufacturer and must be considered when selecting a pump for a s
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Q1. Introduce yourself
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Q1. What is the grade of coal in coal handling plant? Explain superfinishing processes like honing,lapping Differences between casting and forging Draw the processes in coal handling plant How coal burnt is t...read more
Ans. 
The grade of coal in a coal handling plant is determined by its carbon content and calorific value.
• Coal grades are classified based on their carbon content and calorific value, such as anthracite, bituminous, sub-bituminous, and lignite.

• Superfinishing processes like honing and lapping are used to achieve high precision and smooth surface finishes on metal parts.

• Casting involves pouring molten metal into a mold to creat...read more
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Q2. Explain about internship and project?
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