Latest Mechanical Updates
What is the Material composition in IBR tubes?
Carbon max………………… 0.10%
Manganese max……………. 0.60%
Nickel max…………………. 0.25%
Sulphur max………………… 0.050%
Phosphorus max…………….. 0.050%
What is the difference between P11 & P22 pipes?
P11 the chromium molybdenum composition that is 1% ofchromium and 1/4% of molybdenum
P12 the chromium molybdenum composition that is 1% ofchromium and 2% of molybdenum
1st law of Thermodynamics
a. HEAT AND MECHANICAL WORK ARE MUTUALLY CONVERTABLE.
b. ENERGY CAN BE CREATED NOR BE DISTROYED BUT IT CAN BETRANSFERED FROM ONE FORM TO ANOTHER FORM
Difference between Unilateral tolerance and Bilateral tolerance
A unilateral tolerance is tolerance in which variation is permitted only in one direction from the specified direction.e.g. 1800 +0.000/-0.060
Bilateral tolerance is tolerance in which variation is permitted in both direction from the specified direction.e.g. 1800 +0.060/-0.060
Why we need two angle of projections ( 1st angle and 3rd angle)? Cant we standardize to one.
Generally 1 St. angle followed in India and 3rd angle projection is used in European countries. In 1st and 3rd angle projections there is no overlapping of principal planes while drawing side and top views. but in 2nd and 4th angle projections the principal planes are overlapped while drawing top and side views. It results confusion in drawing. For this reason 1st and 3rd angle projections are used commonly.
- During which of the following processes does heat rejection takesplace in carnot vapour cycles
- Constant volume
- Constant pressure
- Constant temperature
- Constant entrophy
What is the difference between Corrective actions and preventive actions?
Corrective actions are taken on discrepancies noticed duringinspection of products/documents/process whereas preventiveactions are taken to eliminate the possibility ofdiscrepancy in future.
What is the Shaft coupling and its types
It is used to join two shafts for transmission motion from one shaft to another shaft,it may be either flexible or rigid type.
Rigid coupling;(Muff coupling, Flange coupling, Marinecoupling, Oldham”s coupling)Flexible coupling;(Flexible bush pin coupling)
Oldham’s Coupling is used when axis of shaft are not aligned
Other types are:
loveys joy coupling
Pin and bush coupling
What is meant by One ton Air conditioner, how fast it cool a room.
1 ton refrigeration means 210 kJ/min extracts heat from thesystem.
Boyle’s law describes the inversely proportional relationship between the absolute pressure and volume of a gas.
- When temperature increases the frequency of the tuning fork
c. Remain same
d. Increases or decreases depending on the material
- What happens in the float chamber during the idling action of the fuel pump
a. It remains empty
b. It remains partially filled
c. It remains filled
C. It remains filled
During idling period, no petrol is drawn from the carburettor and the float inside the float chamber floats exerting pressure on the fluid as a result of which the inflow of the fuel to carburettor is stopped.
- The exact analysis of viscous flow problems can be made by
a. Euler’s equation
b. Hagen poiseuille’s equation
c. Continuity equation
d. Navier-stroke’s equation
D. Navier – stroke’s equation