Mechanical Engineer interview questions

Top 11 questions and answers

1

The second law of thermodynamic depicts that the total entropy of an isolated system can never reduce over time.

2)Name two vital conditions of a perfect gas.

Two vital conditions of perfect gas are:

• It should satisfy the state equation.
• Specific heat remains constant

3)What is mean by greenfield project?

These are the projects, which are built from scratch and does not create pollution.

4) What do you mean by cotter joint?

It is one of the types of a joint that are used to connect two rods, which are under compressive or tensile stress. This joint is made of steel or iron. Cotter joint is used for connecting a piston rod to the crosshead of the reciprocating steam engine.

5) Define pitting.

It is corrosion that turns to a small hole in the metal.

6) What is the alloy of tin and lead?

Solder is an alloy of tin and lead. It is primarily used to make electrical joints.

7) What is the importance of tolerance in engineering?

You cannot design any product without tolerance. It increases the chances of rejection rate and overall product cost. You utilize tolerance in part dimension to reduce cost and facilitate manufacturer.

8) What is caustic embrittlement?

Caustic embrittlement is a physical change in metal. In this phenomenon, the boiler becomes brittle because of accumulation of caustic soda.

9) Name the boiler that does not need a steam drum.

Supercritical pressure boiler does not need a steam drum.

10) Explain the Otto cycle in brief.

Otto cycle describes the functioning of a typical spark-ignition four-stroke engine. Otto cycle is a description of what happens to gas as it is subjected to changes of volume, temperature, addition, or removal of heat.

11) What do you mean by annealing?

Annealing is the process of heating any material above the recrystallization temperature and cooling after some time. This process increases the hardness and strength of metal material. The result you will get is a reduction of dislocations in the crystal structure of metal being annealed.

15) Explain enthalpy.

It is the heat content of a thermodynamic system.

16) Define a uniformly distributed load.

A uniformly distributed load is a load which is spread over a region of the beam. Here the magnitude of the load remains similar throughout the element.

17) Explain different types of fits.

MECHANICAL ENGG MECHANICS
QUESTION ANSWER

1. According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.
A. True
B. False

ANSWER: Option B

2. The friction experienced by a body, when in motion, is known as
A. rolling friction
B. dynamic friction
C. limiting friction
D. static friction
Answer: Option B

3. Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity
v is made to struck the second ball. Both the balls after impact will move with a velocity
A. v
B. v/2
C. v/4
D. v/8
Answer: Option B


4. The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.
A. Agree
B. Disagree
Answer: Option A

5. The coefficient of restitution for elastic bodies is one.
A. Correct
B. Incorrect
Answer: Option B


6. The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is
A. sin θ
B. cos θ
C. tan θ
D. cosec θ
Answer: Option A


7. The range of projectile on a downward inclined plane is __________ the range on upward inclined plane for the same velocity of projection and angle of projection.
A. less than
B. more than
C. equal to
Answer: Option B

8. The angle of inclination of a vehicle when moving along a circular path __________ upon its mass.
A. depends
B. does not depend
Answer: Option B


9. A body of weight W is required to move up on rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by(where μ = tanφ = Coefficient of friction between the plane and the body.)
A. P = W tanα
B. P = W tan(α + φ)
C. P = W (sinα + μcosα)
D. P = W (cosα + μsinα)
Answer: Option C

10. If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is
A. 30°
B. 60°
C. 90°
D. 120°

Answer: Option D

Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is

A. bh3/4 B. bh3/8 C. bh3/12 D. bh3/36

Answer: Option D

MECHANICAL ENGINEERING

HI THIS LINK FOR MECHANICAL STUDENT IS VERY IMPORTANT

https://m.youtube.com/watch?v=GYo8TsKGK8A