Mechanical engineering interview questions:
Que: what is the other name of micrometer and vernier caliper?
Ans: micrometer's other name is screw gauge & vernier caliper's other name is slide caliper.
Que: what is flash-point?
Ans: flash-point is the lowest temperature at which the vapor of combustible liquid can be ignited in air.
Que: what is the difference between impulse turbine and reaction turbine?
Ans: » In impulse turbine, jet is used to create impulse on blades which rotates the turbine and in reaction turbine, no jet is used pressure energy is converted into kinetic energy.
» In impulse turbine fluid enter & leaves with same energy, but in reaction turbine fluid enter with pressure energy and leaves with kinetic energy.
Que: What is the difference between BSP thread and BSW thread?
Ans: The British Standard Pipe thread (BSP thread) is a family of standard screw thread types that has been
adopted internationally for interconnecting and sealing pipe ends by mating an external (male) with an internal
(female) thread. British Standard Whit-worth (BSW) is one of a number of imperial unit based screw thread standards which use the same bolt heads and nut hexagonal sizes.
Que: What is refrigerant?
Ans: Any substance that transfers heat from one place to another, creating a cooling effect. water is the refrigerant in absorption machines.
Que: The amount of carbon present in cast Iron?
Ans: Carbon is basically present in the form of cementite in cast iron.Its percentage lies in the range of 2.03-6.67(% by weight of cementite for Cast Iron.If the amount is less than the above range than it is stainless steel.
Que: What loads are considered while designing nuts and bolts ?
Ans: Shear loads and crushing loads.
Que: What is the effect of reheat on rankine cycle?
Ans: Its efficiency increases.
Que: Why are the head gaskets blown ?
Ans: Normally head gasket blows, when the engine overheats and they can also blow from incorrect installation or poor design. Head gaskets expand and contract according to engine temperature, these cycles may happen after a long period of time, causes the gasket to fail. If you’re replacing the gasket, check the engine block, and head for warping. Follow proper cleaning and torque specifications during assembly.
Que: What is the difference between humidifier and vaporizer ?
Ans: The basic difference between humidifiers and vaporizers is that humidifiers disperse cool mist
into the air, and vaporizers heat the water to disperse hot steam. Humidifiers are normally used in cooler climates, when due to the usage of heater, the air in the house becomes too dry for comfort and also, it becomes very difficult to breathe. Humidifiers release cool moisture droplets into the air.
Vaporizers also help in moistening the dry air in the house, but vaporizers release hot vapor into the air. There is a heating element in the vaporizers, which help in releasing steam. Vaporizers heat the water and then release vapors.
The basic difference between them is that one emits cold vapors, while the other one emits hot vapors.
Thanks for your information, it was really very helpfull..
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