Hello engineers here I have shared some interview questions helpful for your job interviews .
1) What is the second law of thermodynamics?
》The second law of thermodynamic depicts that the total entropy of an isolated system can never reduce over time.
2) What is ferrite?
3) Which pipes are used for steam lines?
》Steel pipes with welded fitting are used for steam lines.
4) Distinguish between the shear center and elastic center.
》The shear center is a center where the force can act with no twist, whereas elastic center is located at the center of gravity.
5) 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.
6) What is mean by greenfield project?
》These are the projects, which are built from scratch and does not create pollution.
7) 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.
8) Define pitting.
It is corrosion that turns to a small hole in the metal.
9) What is the alloy of tin and lead?
Solder is an alloy of tin and lead. It is primarily used to make electrical joints.
10) 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.
11) 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.
12) Name the boiler that does not need a steam drum.
Supercritical pressure boiler does not need a steam drum.
13) 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.
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.
Fits can be categorized into three groups: 1) clearance fit, 2) interference fit, and 3) transition fit.
- Clearance fit: This fit is identified by the occurrence of clearance between the two similar parts.
- Interference fit: In this fit, the size of the mating parts is predefined to occur interference between these parts. Here the hole tolerance zone is completely below shaft tolerance zone.
- Transition fit: It is a comptonization between clearance and interface fit. In this case of fit, the tolerance zone of the shaft and hole overlaps.
18) Explain important rules that must be kept in mind while designing castings?
Following are the points that you should keep in mind:
- Keep section thickness uniform as much as possible.
- Sudden changes in the thickness should be averted at all costs.
- Design casting by keeping simplicity.
- Avoid large flat surfaces as true large spaces are difficult to create.
- Use a curved shape to improve the stress handling of the cast.
19) What is universal coupling?
Universal coupling is used to connect two shafts whose axes are inclined to each other. It consists of a pair of hinges, connected by a cross shaft.
20) Why would you use pneumatics?
Pneumatic systems are significantly cheaper than other streams, i.e., hydraulic system. It can move faster and do not leak oil if they develop a leak.
21) Explain mechanical refrigeration.
Mechanical refrigeration is a process by which heat is removed from a specific location using an artificial heat-exchange system. The refrigeration system can be cyclic, non-cyclic, magnetic, or thermoelectric depending on the application for which refrigeration is needed.
22) What are various types of brakes?
Various types of brakes are 1) hydraulic breaks, 2) electric breaks, and 3) mechanical breaks.
23) How will you classify sliding contact?
Sliding contact can be classified based on the various thickness of film bearings.
24) How will you create a piston head?
Piston head can be designed on the bases of the following points:
- The crown must have enough strength to absorb the explosion pressure inside the cylinder.
- You can consider Grashof’s formula to calculate the thickness of the head
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