Design Engineer Interview Preparation Guide
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Design Engineering Frequently Asked Questions in various Design Engineer job interviews by interviewer. The set of questions are here to ensures that you offer a perfect answer posed to you. So get preparation for your new job interview

93 Design Engineering Questions and Answers:

1 :: Tell me what is mechanism?

A mechanism is an assembly of different parts which perform a complete motion and is often part of a machine.
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2 :: Tell me what is Hess law?

According to the Hess law the energy transfer is simply independent of the way being followed. If the reactant and the product of the whole process are the same then same amount of energy will be dissipated or absorbed.
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3 :: Tell me what does a pump develop?

Pump is a device that is used to transfer fluid from one place to another place which means it develops flow not pressure.
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4 :: Please explain what do you understand by the concept of a 6 stroke engine?

The six stroke engine is based on the concept of four stroke engine but built with an intention of improvising the efficiency in reducing emission. Every cycle of a four stroke engine involves the upward and downward movement of the piston which happens twice in the chamber, resulting in four total strokes and one of which is the power stroke which provides the torque to move the vehicle. A six stroke engine works similarly except that there are two power strokes.
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5 :: Tell me the difference between projectile motion and rocket motion?

The major difference is that a projectile has no motor or a rocket on it, due to which the momentum is given to it as it is launched. A pen thrown across a room is a classic example of a projectile motion. On the other hand, a rocket or missile has a motor on it which helps in accelerating while moving. This helps in resisting other forces such as gravity. A projectile does not have any specific shape, it is a point mass, whereas rocket has a particular shape having its center of gravity situated at a particular point on its body. Thus rocket motion comes under kinetics and projectile comes under kinematics.
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6 :: Tell me why re-heater is used in gas turbine?

The advantage of reheater is that it significantly increases the thrust; which is a prime reason for its use in gas turbines.
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7 :: Tell me what is the percentage of carbon present in pig iron?

Carbon content is generally 3.5-4.5%.
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8 :: Tell me what is GD&T and Who introduced the concept of GD&T?

GD&T is Geometric Dimensioning and Tolerancing .Its a language through which Design Engineers
communicate.Stanley Parker introduced the concept of Geometric Dimensioning and Tolerancing (GD&T) in 1930’s and he was from Scotland.
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9 :: Tell me if you are provided a bottle then how will you increase its strength?

The strength depends on design, material and thickness of the part. So in order to increase strength of the bottle one can provide the ribs and make the bottom of the bottle concave shaped. You can also increase its strength by using a stronger material and increasing its thickness.
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10 :: Tell me the second law of thermodynamics?

The entropy of the universe increases over time and moves towards a maximum value.
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