Mechanical Interview Questions 1 contains questions about calculate bearing , Octane number , Cetane number, Micro meter, Vernier Caliper, need for drafting, BSP thread, BSW thread, , impulse turbine, reaction turbine, refrigerant, Cast Iron, Nut and Bolts.
1. How to
calculate bearing number to diameter of the inner and outer
2. 1 hp how much watt?
3. Definition of Octane number & Cetane number
4. What is the other name of Micro meter & Vernier
Calliper?
5. What is the need for drafting?
6. What is the difference between BSP thread and BSW
thread?
7. What is basic difference between impulse turbine and
reaction turbine?
8. What is refrigerant?
9. The amount of carbon present in Cast Iron
10. What are the loads considered when designing the Nut
and Bolts?
1. How to calculate bearing number to diameter of the inner and outer
Divide the shaft diameter size by 5, it will give last two digitof the bearing no. and according to type of load we have tochose the type of bearing and that will give prior no. ofthe bearing.
2. 1 hp how much watt?
746.2Watt
3.Definition of Octane number & Cetane number
Octane No.-
Octane number is defined as the percentage, by volume, of iso octane in the mixture of iso octane and h-heptane. It is the measure of rating of SI engine.
Cetane No.-
Cetane number is defined as the percentage, by volume, of n-cetane in the mixture of n-cetane and alpha methyl naphthalene. It is the measure of rating of CI engine.
4. What is the other name of Micro meter & Vernier Calliper?
Micrometer’s other name is Screw Gauze.
Vernier caliper’s other name is slide caliper.
5. What is the need for drafting?
Drafting is the allowance give to casting process.it also used to remove the casting from mould without damage of corners.
6. What is the difference between BSP thread and BSW thread?
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 Whitworth (BSW) is one of a number of imperial unit based screw thread standards which use the same bolt heads and nut hexagonal sizes.
7. What is basic difference between impulse turbine and reaction turbine?
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& leave with same energy ,but in reaction turbine fluid enter with pressure energy & leaves with kinetic energy
In impulse turbine all the pressure drops in nozzle only & in reaction turbine pressure drops both fixed & moving blades.the difference is due to blade profiles.
8. What is refrigerant?
Any substance that transfers heat from one place to another, creating a cooling effect. water is the refrigerant in absorption machines.
9. The amount of carbon present in Cast Iron
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.
10. What are the loads considered when designing the Nut and Bolts?
Shear Loads & crushing loads