Related Questions

In a engineering, test, a rocket sled is propelled into a target. If the sled's distance d in meters from the target is given by the fomula d = - 1.5 t2+120, where t is the number of seconds after rocket ignition, then how many seconds have passed since rocket ignition when the sled is 10 meters from the target?
A 2.58
B 8.59
C 8.94
D 9.31
The most accurate ignition system of a spark ignition engine is
A Magneto system
B Battery system
C Electronic control unit system
D Magneto and electronic system
The ignition in a spark ignition engine takes place when the piston is
A Exactly at the T.D.C. position on its compression stroke
B Approaching the T.D.C. position on its compression stroke
C Leaving the T.D.position on its compression stroke
D Approaching the T.D.C. position on its exhaust stroke
The auto ignition in a spark ignition engine means
A Automatic ignition of the charge at the end of compression
B Ignition induced by the passage of a spark
C Ignition of the charge before the passage of flame front
D Ignition induced to supplement the process of normal combustion
Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.
A 1000
B 4000
C 8000
D 15000
Anthracite can be used for
A Recarbonising steel
B Making carbon electrodes
C Blending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke
D All of the above
Anthracite coal
A Contains more volatile matter than bituminous coal
B Ignites more easily than bituminous coal
C Is essentially a coking coal
D Burns with short, bluish, yellow-tipped flame producing very little smoke
Efficient burning of anthracite coal requires
A Low preheat of air
B Fine grinding
C High excess air
D All of the above
A continuous belt of urban population progressively linking several cities is known as
A Metropolis
B Megalopolis
C Conurbation
D City sprawl
Products drawn from the top to bottom of the crude oil distillation column has progressively increasing
A Boiling points
B Molecular weight
C C/H ratio
D All of the above

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