2732. A coal containing very high percentage of durain is called __________ coal.
Bright
Splint
Non-banded
Boghead
✅ The correct answer is option B.
2693. In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
Transportation of coal
Drying of coal
Combustion of coal by supplying it around the burner
Preheating the primary air
✅ The correct answer is option C.
2676. Hydrogen percentage (by weight) in crude petroleum may be about
5
15
25
35
✅ The correct answer is option B.
2681. A coal with high ash content
Has higher calorific value
Is harder and stronger
Is not subjected to washing
Has low quantity of mineral matter
✅ The correct answer is option B.
2683. Which of the following is not a sulphur compound present in petroleum ?
Thiophenes
Mercaptans
Sulphones
Pyroles
✅ The correct answer is option D.
2688. Lignite is
A high rank coal
A coking coal
Can be used for gasification and steam generation
A black banded coal which burns with a non-smoky yellowish flame
✅ The correct answer is option C.
2694. Aniline point is a property of the
diesel
LPG
naphtha
gasoline
✅ The correct answer is option C.
2699. Catalyst used in catalytic reforming is
platinum on alumina
nickel
iron
aluminium chloride
✅ The correct answer is option A.
2704. Which of the following coke has the least percentage of ash?
Petroleum coke
Beehive coke
Foundary coke
Metallurgical coke
✅ The correct answer is option A.
2709. Ethyl mercaptan is added to the Doctor negative LPG for facilitating the detection of its leakage (by bad odour) to the extent of about __________ ppm.
1
50
5000
10000
✅ The correct answer is option B.