Sunday 14 April 2013

Is it easy to remember to English words - Yes it is by knowing what the root words mean



Dict – order
Demo – People
dol – pain, sorrow
duct, duc – lead
ego – self
eu – good, well
fac, fact, fic, fict – make, do
fer – carry
gen – birth, race
grad, gress – to step, go
ject, jet – throw
jud – judge
leg, lec, lex, locu, log – speak, read
lic, licit – permit
logo – word
luc, lum, lus – light, shine
Magn, maj, max, mas – great, big
mal – bad
matr, mater – mother
mis – hate
dogma – opinion
dura – hard
anthro – ma
fid, fig – faith
flex – bend
greg – herd
cratic – rule

Saturday 13 April 2013

Relation between different terms used for the weight measurement in different standards


3 tolas = 1 Palam
8 Palams = 1 Seer
5 Seers = 1 Viss
8 Visses = 1 maund
20 maunds = 1 candy

16 ounces = 1 Pound
14 Pounds = 1 Stone
2 Stones = 1 Quarter
4 Quarters = 1 hundred wt.(cwt)
20 cwts = 1 ton

1000 gms = 1 Kg
100 Kg = 1 Qunital
10 Quintals = 1 metric tonne

Relation between various terms used in Area calculation


120 Sq. Yards = 1 Sq. Rood
4 Sq. Roods = 1 acre
640 acres = 1 Sq. mile

Measurements - Length (inter relation between various terms related to length)


12 inches = 1 foot
3 feet = 1 yard
22 yards = 1 Chain
10 Chains = 1 Furlong
8 Furlong = 1 mile


12 inches = 1 foot
3 feet = 1 yard
5.5 yards = 1 Pole
4 Poles = 1 Chain
10 Chains = 1 Furlong
8 Furlong = 1 mile



6 feet = 1 fathom
110 fathoms = 1 furlong


6075.5 feet = 1 Knot(nautical mile)
3 Knots = 1 League
20 Leagues = 1 degree

Friday 12 April 2013

Classification of Heat Exchangers


Various commonly used functional groups with examples


Functional Group
Name
Example
- C - OH
Alcohol
CH3OH – methylalcohol
- C - CHO
Aldehyde
CH3CHO – Acetaldyhde
-C
       C - O
-C
Ketone
CH3COCH3 - Acetone
- C - COOH
Acid
CH3COOH – Acetic Acid
- C – O – C
Ether
CH3OCH3 – Dimethyl Ether
- C – NH2
Amine
C3H7NH2 – Propyl Amine
- C – COOR
Ester
CH3COOC2H5 – Methyl Ethyl Ester

Alkyne - Formula


Name of alkyne
Formula
Ethyne
C2H2
Propyne
C3H4
Butyne
C4H6
Pentyne
C5H8
Hexyne
C6H10

Alkene - Formula


Name of alkene
Formula
Ethene
C2H4
Propene
C3H6
Butene
C4H8
Pentene
C5H10
Hexene
C6H12

Alkyl Group and their Formula


Name of alkyl group
Formula
Methyl
CH3
Ethyl
C2H5
Propyl
C3H7
Butyl
C4H9
Pentyl
C5H11
Hexyl
C6H13

Alkanes and their formula


Name of alkane
Formula
Methane
CH4
Ethane
C2H6
Propane
C3H8
Butane
C4H10
Pentane
C5H12
Hexane
C6H14

Basic classification of Alkanes, Alkenes & Alkynes and their properties


S.No.
Property
Alkanes
Alkenes
Alkynes
General Formula
CnH2n+2
CnH2n
CnH2n-2
Gases
Upto 5 carbon atoms
Upto 3 carbon atoms
Upto 3 carbon atoms
Liquids
Between 6 to 10 carbon atoms
Between 4 to 13 carbon atoms
Between 4 to 11 carbon atoms
Solids
Above 10 carbon atoms
Above 13 carbon atoms
Above 1 carbon atoms
In water
Insoluble
Insoluble
Insoluble
Combustion
Highly combustible and so used as fuels
On combustion, produces CO2 and H2O
Produce large amount of heat on combustion. Used as fuels
Reactions
Highly unreactive. Undergo substitution reactions
Undergo additional reactions giving rise to ssaturated compounds.
Combine with hydrogen, halogens etc to give rise to saturated compounds.
Compound
Saturated Hydrocarbon
Unsaturated Hydrocarbon
Unsaturated Hydrocarbon
Other name
Paraffins
Olefins


Uses
Used as fuels such as natural gas, kerosene, petrol, LPG; solvents and in the production of methonal, ethanol, hydrogen
Used in the production of polymers, alcohols
Used in welding (acetylene), artificial ripening of fruits

Compressor - Types & Classification