When the ionisation energy of a gas is high
more electrons can be generated at low temperatures
more ions can be generated at low temperatures
arc temperature increases
arc extinguishes
1 point
According to Eggert-Saha equation, when the temperature of the gas increases
fraction of ionisation increases
fraction of ionisation decreases
electron number density decreases
ion number density decreases.
1 point
While welding of metals and alloys, metal vapours control the ionisation process inside arc because
metal vapours have low ionisation energy
metal vapours have high ionisation energy
ionisation energy decreases as a function of temperature
ionisation energy increases as a function of temperature.
1 point
By introducing diatomic gases in atomic arc shielding gases,
arc becomes hotter
weld bead penetration increases
arc extinguishes
temperature gradient inside the arc can be reduced.
1 point
Dissociation energy of a diatomic gas
decreases when the temperature is increased
increases when the temperature is increased
does not change with temperature
changes with gas velocity.
1 point
When CO2CO2 dissociates, it forms
CO and O
C and O2O2
C2C2 and O
CO2CO2 and C.
1 point
Which one of the following gases has highest ionisation energy?
Argon
Iron vapour
Helium
Atomic hydrogen
1 point
In welding arc, electric current is determined by
electron current because of mass of the electron is low
ionic current mass of the electron is low
melting point of the electrode
metal vapour condensation.
1 point
Average drift velocity of electron increases when the
gas velocity increases
time between two collisions decreases
electron number density increases
time between two collisions increases.
1 point
Plasma jet formation in arc is due to
repulsion of charge carriers
generation of Lorentz force
accumulation of charge carriers at the electrode tips
all the above
Answers
Natural Resources
Agriculture
Crops
Wheat
Maize
Bajra
Sugarcane
Rice
Moong
Mash
Masoor
Gram
Ground Nut
Jawar
Oil Seeds like Rape,Mustard and Sun/Flower are also grown in minor quantities
Fruits
Guavas
Citrus
Banana
Vegetables
Potato
Turnip
Bottle Gourd
Ladyfinger
Carrot
Cauliflower
Onion
Peas
Tomato
Garlic
Forests
An area of 38,483 Hectares is under forests, which is about 10% of the total area of the district. There is also linear plantation of 337 Km alongside the roads/rails/canals in the district. Trees grown in the area are:
Kau
Phalai
Kikar
Sanatha
Popular
Shisham
Livestock
Goat
Cattle
Buffaloes
Sheep
Ores and Minerals
Reserves
Jhelum has very rich reserves of mineral resources. Minerals like Rock Salt, Brine, Gypsum, Coal, Bentonite and Silica Sand are being exploited commercially by private and public sector agencies in the district. Khewra Salt mine is the biggest in Pakistan and is located in district Jhelum.
Major Minerals
Rock Salt
Brine
Gypsum
Coal
Bentonite
Silica Sand
Fireclay
Lime Stone
Marble
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Answer:
According to Eggert-Saha equation, when the temperature of the gas increases