For the safety of a steam boiler the number of safety valves fitted are____________?

Related Mcqs:

1. The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation__________?

   A. pvls=C
   B. pv1126 = C
   C. pv1A = C
   D. pv = C

2. The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is___________?

   A. 0.6
   B. 0.578
   C. 0.555
   D. 0.5457

3. The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is__________?

   A. 0.555
   B. 0.578
   C. 0.5457
   D. 0.6

4. The isentropic expansion of steam through nozzle for the steam initially dry saturated at inlet is approximated by equation?

   A. pv = C
   B. pv1A = C
   C. pv1i = C
   D. pv

5. Steam turbines commonly used in steam power station are__________?

   A. condensing type
   B. non-condensing type
   C. none of the above

6. 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

7. The commercial sources of energy are____________?

   A. solar, wind and biomass
   B. fossil fuels, hydropower and nuclear energy
   C. wood, animal wastes and agriculture wastes
   D. none of the above

8. In a boiler installation the natural draught is produced_____________?

   A. due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in
   B. due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column
   C. due to the fact that at the chimney top the pressure is more than its environmental pressure
   D. all of the above

9. 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%

10. Blowing down of boiler water is the process_____________?

    A. to reduce the boiler pressure
    B. to increase the steam temperature
    C. to control the solid concentration in the boiler water by removing some of the concentrated saline water
    D. none of the above