At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________?

Related Mcqs:

1. The critical pressure at which latent heat of vaporisation is zero is________________?

   A. 225.65 kgf/cm2
   B. 273 kgf/cm2
   C. 100 kgf/cm2
   D. 1 kgf/cm2
   E. – 1 kgf/cm2

2. The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is__________________?

   A. less
   B. more
   C. equal
   D. may be less or more depending on temperature
   E. unpredictable

3. The pressure at which latent heat of vaporisation of water is zero, is_________________?

   A. below atmospheric pressure
   B. 1 kg/cm2
   C. 100 kg/cm2
   D. 170 kg/cm2
   E. 225.6 kg/cm2

4. A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm2 and a volume of 0.039 m3 at 150 kg/cm2. The bulk modulus of elasticity of liquid is___________________?

   A. 400 kg/cm2
   B. 4000 kg/cm2
   C. 40 x 105 kg/cm2
   D. 40 x 106 kg/cm2
   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 latent heat of steam with increase of pressure__________________?

   A. remains same
   B. increases
   C. decreases
   D. behaves unpredictably
   E. none of the above

7. To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than____________________?

   A. 2.4 m above the hydraulic gradient
   B. 6.4 m above the hydraulic gradient
   C. 10.0 m above the hydraulic gradient
   D. 5.0 above the hydraulic gradient
   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. The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________?

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

10. Water at pressure of 4 kg/cm2 and 160°C temperature when exposed to atmosphere will_________________?

    A. boil
    B. flash i.e. get converted into steam
    C. remain as it was
    D. cool down
    E. none of the above