Q. The surface tension of fluid in contact with air at 25℃ is 0.51N/m. The pressure inside a droplet is to be 0.05 N/cm² greater than outside pressure. Determine the diameter of the droplet of water.

View solution

Q. Will capillary rise occur and if it occurs what will be capillary rise if glass capillarity tube is immersed in water and experiment is carried out by astronauts in space.

View solution

Q. Find the capillarity rise or fall if a capillary tube of diameter .03m is immersed in hypothetical fluid with specific gravity 6.5, surface tension 0.25 N/m and angle of contact 147°.

View solution

Q. An oil of vicosity 7 poise is used for lubrication between shaft and sleeve. The diameter of shaft is 0.6 m and it rotates is 360 rpm. Calculate the power lost in oil for a sleeve length of 160mm. The thickness of oil film is 1.0mm.

View solution

Q. Determine the minimum size of glass tube that can be used to measure water level if the capillary rise in the tube is restricted to 5mm. Consider surface tension of water in contact with air as 0.073 N/m.

View solution

Q. Calculate the magnitude of capillary effect in millimeters in a glass tube of 7mm diameter, when immersed in mercury. The temperature of the liquid is 25℃ and the values of surface tension of mercury at 25℃ is 0.51 N/m. The angle of contact for mercury is 130°.

View solution

Q. What is the variation of cp, cv and k in case of gases when the temperature increases?

View solution

Q. Determine the compressibility of an incompressible fluid, if the pressure of the fluid is changed from 70 N/m² to 130 N/m². The volume of the liquid changes by 0.15 percent.

View solution

Q. A cylinder of 0.8 m³ in volume contains superheated steam at 70℃ and 0.4 N/m² absolute pressure. The superheated steam is compressed to 0.3 . Find pressure and temperature.

View solution

Q. A gas weighs 16 N/m³ at 30℃ and at an absolute pressure of 0.35 N/mm². Determine the gas constant.

View solution

Q. Calculate the pressure exerted by 9 kg of air at a temperature of 20℃ if the volume is 0.8m³. Assuming ideal gas laws are applicable.

View solution

Q. The value of gas constant is same for all the gases.

View solution

Q. If for same temperature and pressure change, the value of bulk modulus is compared for isothermal process and adiabatic process, which one would be higher?

View solution

Q. If the fluid is incompressible, do thermodynamic properties play an important role in its behaviour at varying temperature and pressure?

View solution

Q. For a compressible fluid, if there is no change in specific volume at constant temperature, what type of process it is?

View solution

Q. If there is no exchange of heat between system and surrounding where system comprises of a compressible fluid but the heat is generated due to friction, the process is an adiabatic.

View solution

Q. A water drop of diameter 1 cm breaks into 1000 similar droplets of same diameter. What will be the gain or loss in the surface energy? (Take surface tension as 0.075 N/m)

View solution

Q. If a glass tube of 10 mm diameter is immersed in water, what will be the rise or fall in capillary?

(Take surface tension = 0.075 N/m, g = 10 m/s² and angle of contact = 0)

View solution

Q. The rise in the level of a liquid in a tube is h. If half the amount is poured outside, what will be the new rise in liquid level?

View solution

Q. The ratio of the surface tension S and density ρ of liquid 1 and 2 are 1:2 and 1:4 respectively. Equal amount of the two liquids is poured into two identical tubes. What will be the ratio of the rise in the liquid level in the two tubes? (Assume the angle of contact to be same)

View solution