Skyroot Aerospace 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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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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Q1. Basic Fundamentals related to fluids and thermodynamics
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Problem statement related to the specified field

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