Power Generation

Load carrying capacity of belt conveyor is about___________?

A. 20 to 40 tonnes/hr
B. 50 to 100 tonnes/hr
C. 100 to 150 tonnes/hr
D. 150 to 200 tonnes/hr

In coal preparation plant, magnetic separators are used to remove___________?

A. dust
B. clinkers
C. iron particles
D. sand

Secondary air is the air used to______________?

A. reduce the flame length
B. increase the flame length
C. transport and dry the coal
D. provide air round the burners for getting optimum combustion

Primary air is that air which is used to_____________?

A. reduce the flame length
B. increase the flame length
C. transport and dry the coal
D. provide air around burners for get¬ting optimum combustion

Caking coals are those which__________?

A. burn completely
B. burn freely
C. do not form ash
D. form lumps or masses of coke

The capacity of large turbo-generators varies from___________?

A. 20 to 100 MW
B. 50 to 300 MW
C. 70 to 400 MW
D. 100 to 650 MW

Economisers improve boiler efficiency by__________?

A. 1 to 5%
B. 4 to 10%
C. 10 to 12%

Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________?

A. 20 kgf/cm2
B. 50 kgf/cm2
C. 100 kgf/cm2
D. 150 kgf/cm2

Load center in a power station is___________?

A. center of coal fields
B. center of maximum load of equipments
C. center of gravity of electrical system

The efficiency of a modern boiler using coal and heat recovery equipment is about_____________?

A. 25 to 30%
B. 40 to 50%
C. 65 to 70%
D. 85 to 90%