Question { Engineers India Limited, 6594 }

What is meant by mechanical engineer?
Or who is mechanical engineer?

Answer

Father of engineering

Question { Valeo Lighting Systems India Private Limited, 8387 }

mechanical efficiency is high in petrol engines compared to diesel engines but why diesel engines are preferred in heavy duty vehicles

Answer

In case of heavy vehicles, more torque is require. More torque comes from larger stroke and large stroke means high compression ratio. Diesel engines have high compression ratio. For same temperature and pressure, diesel engines are more efficient.

Question { Engicon, 3536 }

what is the main differance betn id & fd fan

Answer

ID is "Induced Draft" and FD is "Forced Draft." In an induced draft system, the fan is at the exit end of the path of flow, and the system is under negative pressure - that is, the pressure in the flow area is below atmospheric, because the air is being drawn through the fan. In a forced draft system the fan is at the entry end of the path of flow. It operates at positive pressure because outside air is drawn into the fan and forced into the system.

Question { Variant, 15154 }

Enumerate some differences between an "orifice" and a "notch". Also tell if "jet" relates more to an orifice or a notch?

Answer

notch is the device used for the measurement of the rate of flow of liquids through small channels at tanks where as orifice is used to measure rate of flow through pipes.

Question { SSK, 2507 }

An Rod of 25mm in dia, is bend and made into a circle Ring with outer dia 200mm, then what ll be the length of rod required?

Answer

length is irrespective of the rod dia.
Therefore, length = Pi*D
ie= Pi*200=628

Question { Amul, 3514 }

10. What is difference between welding and brazing

Answer

Welding fuses base metals as well as filler metal, whereas in brazing, the filler metal is allowed to enter between two base metals using capillary action.

Question { Alfa Laval, 6137 }

What are the types of id fan we used in industries?

Answer

ID is "Induced Draft" and FD is "Forced Draft." In an induced draft system, the fan is at the exit end of the path of flow, and the system is under negative pressure - that is, the pressure in the flow area is below atmospheric, because the air is being drawn through the fan. In a forced draft system the fan is at the entry end of the path of flow. It operates at positive pressure because outside air is drawn into the fan and forced into the system.

Question { 3638 }

What is mean by compression ratio?

Answer

The compression ratio of an internal-combustion engine or external combustion engine is a value that represents the ratio of the volume of its combustion chamber from its largest capacity to its smallest capacity. It is a fundamental specification for many common combustion engines.