Related Questions

Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible?
A [

A.

B. > 3

B 50
C 1
The value of coefficient of discharge is __________ the value of coefficient of velocity.
A Less than
B Same as
C More than
D None of these
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity
A One-half
B One-third
C Two-third
D Three-fourth
The vector sum of cutting velocity and chip velocity is __________ shear velocity.
A Equal to
B Less than
C More than
D None of these
A body of mass ‘m’ moving with a constant velocity ‘v’ strikes another body of same mass moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is
A v
B 2v
C 4v
D 8v
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity
A Vi = Vo
B Vt > Vo
C U
D V = Uo
A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.
A 45
B 60
C 80
D 95
Film coefficient is defined as the ratio of
A Thermal conductivity to the equivalent thickness of the film of fluid
B Temperature drop through the films of fluids to the thickness of film of fluids
C Thickness of film of fluid to the thermal conductivity
D Thickness of film of fluid to the temperature drop through the films of fluids
The velocity of piston in a reciprocating steam engine is given by (where $$\omega $$ = Angular velocity of crank, r = Radius of crank pin circle, $$\theta $$ = Angle turned by crank from inner dead center and n = Ratio of length of connecting rod to the radius of crank)
A $$\omega {\text{r}}\left( {\sin \theta + \frac{{\sin 2\theta }}{{\text{n}}}} \right)$$
B $$\omega {\text{r}}\left( {\cos\theta + \frac{{\cos2\theta }}{{\text{n}}}} \right)$$
C $${\omega ^2}{\text{r}}\left( {\sin \theta + \frac{{\sin 2\theta }}{{\text{n}}}} \right)$$
D $${\omega ^2}{\text{r}}\left( {\cos\theta + \frac{{\cos2\theta }}{{\text{n}}}} \right)$$
The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
A 0.086
B 1.086
C 1.086
D 4.086

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