Related Questions

The angle of contact between a glass capillary tube of length 10 cm and a liquid is 90 degree . If the capillary tube is dipped vertically in the liquid, then the liquid:
A Will rise in the tube
B Will get depressed in the tube
C Will rise -up to 10 cm in the tube and will over flow
D Will neither rise nor fall in the tube.
The angle of contact between a glass capillary tube of length 10 cm and a liquid is 90 Degree. If the capillary tube is dipped vertically in the liquid, then the liquid:
A Will rise in the tube
B Will get depressed in the tube
C Will rise-up to 10 cm in the tube and will over flow
D Will neither rise not fall in the tube
Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is
A $$\frac{{\text{Q}}}{2}$$
B $$\frac{{\text{Q}}}{4}$$
C $$\frac{{\text{Q}}}{8}$$
D $$\frac{{\text{Q}}}{{16}}$$
In a domestic vapour compression refrigerator, the refrigerant commonly used is
A CO2
B Ammonia
C R-12
D All of these
The common refrigerant in domestic refrigerator is
A Neon
B Oxygen
C Nitrogen
D Freon
The coefficient of performance of a domestic refrigerator is ________ as compared to a domestic air-conditioner.
A Same
B Less
C More
D None of these
In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is
A Less than 2 kg
B More than or equal to 3.65 kg
C More than 10 kg
D There is no such consideration
Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)
A d
B $$\frac{1}{{\text{d}}}$$
C $$\sigma $$
D $$\frac{l}{\sigma }$$
For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it
A Decreases the pressure drop
B Decreases the outlet temperature of cooling medium
C Increases the overall heat transfer coefficient
D None of these
A vapour absorption refrigerator uses _________ as a refrigerant.
A Water
B Ammonia
C Freon
D Aqua-ammonia

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