64e34 01 mechanical engineering interview mechanical engineer interview questions abrasive water jet machining Interview Questions Mechanical Engineering interview

Mechanical Engineering Interview

This articles is all about Mechanical Engineer Interview Questions with solved examples. This part of mechanical Engineering Interview, manufacturing engineering questions are discussed.

64e34 01 mechanical engineering interview mechanical engineer interview questions abrasive water jet machining Interview Questions Mechanical Engineering interview

 

In abrasive water jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate

(A) increases continuously

(B) decreases continuously.

(C) decreases, becomes stable and then increases.

(D) increases, becomes stable and then decreases.

Answer:

(D) increases, becomes stable and then decreases.

Hint:

5104d 01 abrasive water jet machining material removal rate relation abrasive water jet machining Interview Questions Mechanical Engineering interview

Graph for abrasive jet machining for the distance between the nozzle tip and work surface (l) and abrasive flow rate is given in figure. It is clear from the graph that the material removal rate is first increases because of area of jet increase than becomes stable and then decreases due to decrease in jet velocity.

 

During normalizing process of steel, the specimen is heated

(A) between the upper and lower critical temperature and cooled in still air.

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(B) above the upper critical temperature and cooled in furnace.

(C) above the upper critical temperature and cooled in still air.

(D) between the upper and lower critical temperature and cooled in furnace

Answer:

(C) above the upper critical temperature and cooled in still air.

Hint:

Normalizing involves prolonged heating just above the critical temperature to produce globular form of carbine and then cooling in air.

 

The operation in which oil permeated into the pores of a powder metallurgy product known as

(A) mixing

(B) sintering

(C) impregnation

(D) infiltration

Answer:

(C) impregnation

Hint:

If the pores in a sintered compact are filled with an oil, the operation is called as impregnation. The lubricants added to the porous bearings, gears and pump rotors etc.

 

Green sand mold indicates that

(A) polymeric mold has been cured

(B) mold has been totally dried

(C) mold is green in color

(D) mold contains moisture

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Answer:

(D) mold contains moisture

Hint:

A green sand mold composed of a mixture of sand (silica sand, SiO2), clay (which acts as binder) and water. The word green associated with the condition of wetness or freshness and because the mould is left in the damp condition, hence the name “green sand mold”.

 

Which one among the following welding processes uses non-consumable electrode ?

(A) Gas metal arc welding

(B) Submerged arc welding

(C) Gas tungsten arc welding

(D) Flux coated arc welding

Answer:

(C) Gas tungsten arc welding

Hint:

GTAW is also called as Tungsten Inert Gas Welding (TIG). The arc maintained between the work piece and a tungsten electrode by an inert gas. The electrode is non-consumable since its melting point is about 3400°C.

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