In order to avoid capillary correction, the minimum diameter of a manometer used

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Question
In order to avoid capillary correction, the minimum diameter of a manometer used for measuring pressure, should be
Options
A. 2 mm
B. 4 mm
C. 6 mm
D. 8 mm
E. 10 mm.

Correct Answer

6 mm

Hydraulics problems

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1. The height of water level in a tank above the centre of a circular hole 2.5 cm in diameter is 50 m. The velocity of water flowing through the hole, is
Options
A. 31.1 m/sec
B. 31.2 m/sec
C. 31.3 m/sec
D. 31.4 m/sec.

2. Gauge pressure is
Options
A. absolute pressure - atmospheric pressure
B. absolute pressure + atmospheric pressure
C. atmospheric pressure - absolute pressure
D. none of these.

6. If cohesion between the molecules of a fluid is more than adhesion between the fluid and glass, the free level of fluid in a dipped glass tube will be
Options
A. higher than the surface of liquid
B. same as the surface of liquid
C. lower than the surface of liquid
D. none of these.

7. Euler's equation for the motion of liquids assumes that
Options
A. fluid is viscous
B. fluid is homogeneous and incompressible
C. velocity of flow is non-uniform over the section
D. flow is unsteady along the stream line.

9. If u, v, w are the components of the velocity v of a moving particle, the equation represents
Options
A. one diamensional flow
B. two dimensional flow
C. three dimensional flow
D. none of these.

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