The gases are considered incompressible if Match number is equal to 1.0 equal to

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Question
The gases are considered incompressible if Match number is
Options
A. equal to 1.0
B. equal to 1.5
C. is more than 0.5
D. less than 0.2

Correct Answer

less than 0.2

Hydraulics problems

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1. The flow in a channel is said to be non-uniform, if
Options
A. free water surface of an open channel is not parallel to the bed of channel
B. head needed to overcome frictional reistance is less than the drop in elevation of channel bed
C. head needed to overcome frictional resistance is more than the drop in elevation of channel bed
D. all the above.

3. The intensity of pressure due to sudden closure of a valve of a pipe in which water flows with velocity v, is directly proportional to :
Options
A. square root of the bulk modulus of elasticity of water
B. bulk modulus of elasticity of water
C. specific weight of water
D. none of these.

4. When a liquid rotates at constant angular velocity about a vertical axis of a rigid body, the pressure
Options
A. increases linearly to its radial distance
B. varies inversely as the altitude along any vertical line
C. varies as the square of the radial distance
D. decreases as the square of the radial distance
E. none of these.

5. Though angle of deviation of liquid is more in internal mouth piece, the contraction of the jet, is
Options
A. more in the internal mouth piece
B. less in the internal mouth piece
C. equal to external mouth piece
D. none of these.

8. In a short cylindercial external mouthpiece, the venacontracta occurs at a distance from the outlet of orifice equal to
Options
A. diameter of the orifice
B. one-fourth the diameter of the orifice
C. one-third the diameter of the orifice
D. two-third the diameter of the orifice

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