The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately____________________?

Related Mcqs:

1. For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?

   A. more heating surface
   B. less heating surface
   C. equal heating surface
   D. heating surface depends on other parameters
   E. none of the above

2. The rise or depression of liquid in a tube due to surface tensionwim increase in size of tube will________________?

   A. increase
   B. remain unaffected
   C. may increase or decrease depending on the characteristics of liquid
   D. decrease
   E. unpredictable

3. In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 9. Sensitivity of inclined tube to sensitivity of U-tube is equal to________________?

   A. sin 9
   B. sin 9
   C. cas 9
   D. cos 9
   E. tan 9

4. Pick up the wrong statement about water tube boiler in comparison to fire tube boilers ______________________?

   A. former generates steam at high pressure
   B. former occupies less space for same power
   C. rate of steam flow is more in former case
   D. former is used for high installed capacity
   E. chances of explosion are less in former case

5. Steam in water tube boiler as compared to fire tube boiler_________________?

   A. can be raised rapidly
   B. is raisd at slower rate
   C. is raised at same rate
   D. could be raised at fast/slow rate depending on design
   E. none of the above is true

6. Capillary action is due to the_________________?

   A. surface tension
   B. cohesion of the liquid
   C. adhesion of the liquid molecules and the molecules on the surface of a solid
   D. all of the above
   E. none of the above

7. Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler _________________?

   A. increases
   B. decreases
   C. remains unaffected
   D. first increases and then decreases
   E. first decreases and then increases

8. Water tube boilers are those in which________________?

   A. flue gases pass through tubes and water around it
   B. water passes through the tubes and flue gases around it
   C. work is done during adiabatic expansion
   D. change in enthalpy
   E. none of the above

9. Which of the following is a water tube boiler_________________?

   A. locomotive boiler
   B. Cochran boiler
   C. Cornish boiler
   D. Babcock and Wilcox boiler
   E. Lancashire boiler

10. Mercury does not wet glass. This is due to property of liquid known as__________________?

    A. adhesion
    B. cohesion
    C. surface tension
    D. viscosity
    E. compressibility