Related Questions

The safe speed for a train rounding a corner is proportional to the square root of the radius . If the safe speed for a curve of radius 49 meters is 28 km/h. The safe speed for a curve of radius 64 metes is :
A (256/7)km /h
B (256/7) km /h
C 32 km /h
D 23 km /h
Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?
A Vitrain
B Clarain
C Durain
D Fussain
Calorific value of bituminous coal may be around __________ Kcal/kg.
A 500
B 1500
C 6500
D 20000
The bituminous coal is no caking if its carbon content is
A 78-81%
B 81-85%
C 85-90%
D 90-95%
Bituminous coal
A Ignites less easily than anthracite
B Is generally coking
C Burns with smoky yellow flame
D Both B and C
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
A 1000
B 4000
C 6000
D 8000
They reached home safe and sound. Here 'safe and sound' is a/an:
A adjective phrase
B adverbial phrase
C proverb
D idiom
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its
A friability & oxygen content
B caking index
C yield of carbonized products
D calorific value
A coal containing very high percentage of durain is called __________ coal.
A Bright
B Splint
C Non-banded
D Boghead
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon
A Is less liable to spontaneous combustion on storage
B Is more difficult to ignite and produces a shorter flame
C Requires smaller combustion space and less secondary air
D None of these

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