Skyroot Aerospace Mechanical Engg. Design Interview Questions, Process, and Tips

Q1. What's stress and strain?
Ans. 
Stress is the force applied to a material, while strain is the resulting deformation or change in shape.
• Stress is the internal resistance of a material to deformation under an applied force.

• Strain is the measure of deformation or change in shape of a material in response to stress.

• Stress is typically measured in units of force per unit area (such as Pascals), while strain is dimensionless.

• The relationship between stres...read more
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Q2. What is chocking?
Ans. 
Chocking is a condition where a fluid flow is restricted or blocked due to an obstruction in a pipe or duct.
• Chocking can occur in various systems such as hydraulic systems, pneumatic systems, and ventilation systems.

• It can lead to pressure build-up, flow restriction, and potential damage to the system.

• Examples include a clogged pipe causing water flow restriction or a blocked air duct affecting ventilation.

• Chocking can...read more
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Q3. What is the pressure ratio for chocking condition?
Ans. 
Pressure ratio for chocking condition is the critical pressure ratio at which the flow of a fluid becomes choked.
• The pressure ratio for chocking condition is the ratio of the outlet pressure to the inlet pressure at which the flow becomes choked.

• It is a critical parameter in the design of nozzles, valves, and other flow control devices.

• For air flowing through a nozzle, the pressure ratio for chocking condition is appro
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Q4. If there are two pipes of 8 mm and 10mm diameter,former carrying Helium and later carrying Nitrogen. Which pipe will have higher mass flow rate and which will have higher volume flow rate? Why
Ans. 
The pipe with 10mm diameter carrying Nitrogen will have higher mass flow rate due to higher density. The pipe with 8mm diameter carrying Helium will have higher volume flow rate due to lower density.
• Nitrogen has a higher density than Helium, so the pipe with 10mm diameter will have higher mass flow rate

• Helium has a lower density than Nitrogen, so the pipe with 8mm diameter will have higher volume flow rate
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Q5. If three pipes of diameters 4mm 5mm and 8mm are having water flow through them, which pipe can fill a tank faster, considering highest flow rate for the lowest diameter?
Ans. 
The pipe with the highest flow rate for the lowest diameter (4mm) will fill the tank fastest.
• The pipe with the smallest diameter (4mm) will have the highest flow rate for water flow.

• Smaller diameter pipes have higher flow rates due to higher velocity of water flow.

• Therefore, the 4mm diameter pipe will fill the tank fastest compared to the 5mm and 8mm diameter pipes.
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Design a pneumatic actuated stage separation mechanism which will have 6 actuators and should work within a time frame of 200ms. The differential delay between the Mechanisms should be 100ms. The delay for valve actuation is 6ms. Design the above system in MATLAB or any preferred code and send the Pressure vs Time plot, relative velocity vs time plot (after stage separation)

Q1. CEO conducted the interview. This had questions from Kinematics and questions related to my M-Tech project. He asked me to draw and derive diagrams and equations.
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Q1. Just salary negotiation
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Q2. Asked about stay
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