If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Dalton’s law, the pressure in condenser is equal to__________________?

Related Mcqs:

1. Expanding steam to a very low pressure (high vacuum) in steam engines is _________________?

   A. desirable
   B. economical
   C. essential
   D. optional
   E. uneconomical

2. Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio_________________?

   A. 50 : 50
   B. 30 : 70
   C. 70 : 30
   D. 40 : 60
   E. 60 : 40

3. Primary air is the air used to__________________?

   A. provide air around burners for obtaining optimum combustion
   B. transport and dry the coal
   C. convert CO (formed in lower zone of furnace) into C02 at higher zone
   D. air-delivered by forced draft fan
   E. none ot the above

4. The change in internal energy in steam engines equals to__________________?

   A. work done during the rankine cycle ;
   B. work done during compression.
   C. work done during adiabatic expansion
   D. change in enthalpy
   E. none of the above

5. Latent heat of dry steam at atmospneric pressure is equal to____________________?

   A. 539 kcal/kg
   B. 539 BTU/lb
   C. 427 kcal/kg
   D. 100 kcal/kg
   E. 471 kcal/kg

6. The high pressure boiler is oiie producing steam at a pressure more than_________________?

   A. atmospheric pressure
   B. 5 kg/cm2
   C. 10 kg/cm2
   D. 40 kg/cm2
   E. 75-80 kg/cm2

7. One kg of steam sample contains 0.8 kg dry steam; it’s dryness fraction is__________________?

   A. 0.2
   B. 0.8
   C. 1.0
   D. 0.6
   E. 0.5

8. In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is__________________?

   A. 40%
   B. 25%
   C. 50%
   D. 80%
   E. 90%

9. Vacuum for reciprocating steam engines compared to steam turbines is__________________?

   A. more
   B. equal
   C. less
   D. could be more or less depending on the size of plant
   E. none of the above

10. The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if___________________?

    A. the area is horizontal
    B. the area is vertical
    C. the area is inclined
    D. all of the above
    E. none of the above