At which pressure the properties of water and steam become identical_________________?

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. 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%

3. 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__________________?

   A. Ps-Pa
   B. pa-ps
   C. Pa+P
   D. non of these

4. 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

5. 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

6. 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

7. The saturation temperature of steam with increase in pressure increases____________________?

   A. linearly
   B. rapidly first and then slowly
   C. slowly first and then rapidly
   D. inversely
   E. none of the above

8. The dry saturated steam at very high pressure (150-200 kg/cm2) when throttled to atmosphere will become_______________?

   A. wet
   B. superheated
   C. remain dry saturated
   D. dry
   E. none of the above

9. Steam exhaust from high pressure turbine is reheated in _____________________?

   A. boiler drum
   B. superheater tubes
   C. economiser
   D. a separate coil
   E. a separate coil located in convection path

10. The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?

    A. increases
    B. decreases
    C. remains unchanged
    D. increases/decreases depending on steam temperature requirements
    E. unpredictable