7 JULY 2021 CURRENT AFFAIRS QUIZ

Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?

Vitrain

Clarain

Fussain

Durain

TRUE ANSWER : ?
YOUR ANSWER : ?

Lignite is

A coking coal

A black banded coal which burns with a non-smoky yellowish flame

Can be used for gasification and steam generation

A high rank coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Critical Air Blast (CAB) value of coke is a direct measure of its

Hardness

Strength

Reactivity

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has the highest flame speed?

CH₄

H₂

CO

C₂H₆

TRUE ANSWER : ?
YOUR ANSWER : ?

Preheating of __________ the flame temperature.

Either the fuel or the air or both, increases

Combustion air decreases

Either the fuel or the air does not affect

The gaseous fuel before combustion decreases

TRUE ANSWER : ?
YOUR ANSWER : ?

Mineral matter content (M) and ash content (A) in coal are approximately related as

M = 2A

M = 1.1A

M = A

M = 1.5A

TRUE ANSWER : ?
YOUR ANSWER : ?

Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of

Too much air for combustion

Pulverised coal in boilers

Correct amount of air for combustion

Less air for combustion

TRUE ANSWER : ?
YOUR ANSWER : ?

Washing of coal is done to reduce the

Mineral matter

Both B and C

Adhering impurities

Inherent impurities

TRUE ANSWER : ?
YOUR ANSWER : ?

Increase in ash content of blast furnace coke

Does not affect its consumption in the furnace

Decreases its hardness and abrasion resistance

Increases its consumption in the furnace

Reduces its consumption in the furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

For maximum discharge through a chimney, its height should be

Equal to the height of the hot gas column producing draught

Infinitely long

More than 105.7 metres

200 meters

TRUE ANSWER : ?
YOUR ANSWER : ?

↑