139) The hammer blow in pipes occurs when

there is excessive leakage in the pipe

the pipe bursts under high pressure of fluid

the flow of fluid through the pipe is suddenly brought to rest by closing of the valve

the flow of fluid through the pipe is gradually brought to rest by closing of the valve

Answer is:

the flow of fluid through the pipe is suddenly brought to rest by closing of the valve

gravitational force is equal to the upthrust of the liquid

gravitational force is less than the upthrust of the liquid

gravitational force is more than the upthrust of the liquid

none of the above

Answer is:

one-dimensional flow

two-dimensional flow

three-dimensional flow

four-dimensional flow

Answer is:

sub-sonic flow

sonic flow

super-sonic flow

hyper-sonic flow

Answer is:

Agree

Disagree

Answer is: