The present post (Part-2) contains the important basic concepts in Machine design and related machine drafting technology in Mechanical Engineering. Note down each concepts which might help in GATE 2015 Mechanical.

Important basic concepts in Machine Design for GATE 2015 Part-3

- For butt welding of two plates each of which is 25 mm thick, the best process would be electro slag welding.
- The compression members tend to buckle in the direction of least radius of gyration
- The diameter of a washer is generally slightly more than the diameter of the bolt.
- A reinforced concrete beam is considered to be made up of heterogeneous material.
- According to Euler’s theory the
critical length of a column is given by P
_{c}= π^{2}EI/L^{2 .} - Rankine formula is valid up to slenderness ratio of 120.
- Slenderness ratio of a column is length of strut/least radius of gyration.
- In hydrodynamics bearing the oil film pressure is generated only by the rotation of the journal.
- If P = bearing pressure on projected bearing area, z = absolve viscosity of lubricant, and N = speed of journal, then the characteristic number is given by ZN/p.
- The rated life of bearing changes inversely as cube of load.
- The oiliness bearing does not need external supply of lubricant.
- In cross or regular lay ropes direction of twist of in stands is opposite to the direction of twist of stands.
- Gears for wrist watches are generally manufactured by helix angle.
- The type of cam used for low and moderate speed engines is generally harmonic
- The form coefficient of a spring is capability to store energy.
- Coriolis component of acceleration is found in wit worth-quick return motion
- Cold working of material increase the fatigue strength.
- A Babbitt is antimony bearing lead or tin alloy
- Addendum of a cycloidal gear tooth is epicycloids

Important basic concepts in Machine Design for GATE 2015 Part-3

Those are really nice colors. Those bearings look good too. Nice.

ReplyDeletebabbit bearings