Steady flow occurs when___________________?
(A) the direction and magnitude of the velocity at all points are identical
(B) the velocity of successive fluid particles, at any point, is the same at successive periods of time
(C) the magnitude and direction of the velocity do not change from point to point in the fluid
(D) the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
(D) velocity, depth, pressure, etc. change from point to point in the fluid flow
Bernoulli equation deals with the law of conservation of__________________?
(A) mass
(B) momentum
(C) energy
(D) work
(D) force
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal____________________?
(A) ratio of inertial force to force due to viscosity
(B) ratio of inertial force to force due to gravitation
(C) ratio of inertial force to force due to surface tension
(D) all the four ratios of inertial force to force due to viscosity, gravitation, sur-face tension, and elasticity
Cavitation will begin when__________________?
(A) the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
(B) pressure becomes more than critical pressure
(C) flow is increased
(D) pressure is increased
(D) none of the above
A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to_________________?
(A) 10 kg
(B) 100 kg
(C) 1000 kg
(D) 1 kg
(D) 10,000 kg
Principle of similitude forms the basis of_________________?
(A) comparing two identical equipments
(B) designing models so that the result can be converted to prototypes
(C) comparing similarity between design and actual equipment
(D) hydraulic designs
(D) performing acceptance tests
Cavitation is caused by_____________________?
(A) high velocity
(B) high pressure
(C) weak material
(D) low pressure
(D) low viscosity
For pipes, turbulent flow occurs when Reynolds number is _____________________?
(A) less than 2000
(B) between 2000 and 4000
(C) more than 4000
(D) less than 4000
(D) none of the above
In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than_______________?
(A) frictional force
(B) viscosity
(C) surface friction
(D) all of the above
(D) none of the above
A large Roynold number is indication of________________?
(A) smooth and streamline flow
(B) laminar flow
(C) steady flow
(D) turbulent flow
(D) highly turbulent flow