A. primary air
B. secondary air
C. tertiary air
Related Mcqs:
- 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 - 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 - The proper indication of incomplete combustion is_______________?
A. high CO content in flue gases at exit
B. high CO2 content in flue gases at exit
C. high temperature of flue gases
D. the smoking exhaust from chimney - The percentage O2 by Weight in atmospheric air is____________?
A. 18%
B. 23%
C. 77%
D. 79% - The percentage 02 by volume in atmosphere air is____________?
A. 21%
B. 23%
C. 77%
D. 79% - Edward’s air pump____________?
A. removes air and also vapour from condenser
B. removes only air from condenser
C. removes only un-condensed vapour from condenser
D. removes air alongwith vapour and also the condensed water from condenser - In a surface condenser if air is removed, there is___________?
A. fall in absolute pressure maintained in condenser
B. rise in absolute pressure maintained in condenser
C. no change in absolute pressure in the condenser
D. rise in temperature of condensed steam - The artificial draught normally is designed to produce____________?
A. less smoke
B. more draught
C. less chimney gas temperature
D. all of the above - Pipes carrying steam are generally made up of_____________?
A. steel
B. cast iron
C. copper
D. aluminium - Which of the following load is responsible for lower power factor of supply system__________?
A. induction motors
B. resistive loads
C. synchronous Motors
D. all of the above
