Related Questions

The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as
A One dimensional flow
B Uniform flow
C Steady flow
D Turbulent flow
If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant
A Is zero
B Is the sum of the two currents
C Is the difference between the two currents
D Cannot be determined
The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as
A One dimensional flow
B Uniform flow
C Steady flow
D Turbulent flow
When the flow parameters at any given instant remain same at every point, then flow is said to be
A Quasi-static
B Steady state
C Laminar
D Uniform
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
একটি ট্রেনের স্থির অবস্থায় দৈর্ঘ্য হলো 100 m। এটি অতি উচ্চ বেগে 80m দৈর্ঘ্যের একটি সুড়ঙ্গের মধ্য দিয়ে যায়। সুড়ঙ্গের দুই প্রান্তে অবস্থিত পর্যবেক্ষকরা লক্ষ করেন যে, একটি মুহূর্তে ট্রেনটির দৈর্ঘ্য ঠিক সুড়ঙ্গের দৈর্ঘ্যের সমান হয়। c এর এককে ট্রেন এর বেগ কত? (A train has a rest length of 100 m. Traveling at a very high velocity, it goes through a tunnel of length 80 m. Observers located at both ends of the tunnel note that at one instant the train appears to exactly fit within the tunnel. What is the velocity of the train expressed in units of c?)
A 0.866 c
B 0.333 c
C 0.5 c
D 0.6 c
The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow)
A 0.423 D
B 0.577 D
C 0.223 D
D 0.707 D
The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonion fluid in a circular pipe is
A 0.5
B 1
C 2
D 0.66
The velocity of a particle moving with simple harmonic motion, at any instant is given by (where $$\omega $$ = Displacement of the particle from mean position)
A $$\omega \sqrt {{{\text{x}}^2} - {{\text{r}}^2}} $$
B $$\omega \sqrt {{{\text{r}}^2} - {{\text{x}}^2}} $$
C $${\omega ^2}\sqrt {{{\text{x}}^2} - {{\text{r}}^2}} $$
D $${\omega ^2}\sqrt {{{\text{r}}^2} - {{\text{x}}^2}} $$
The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion and y = Displacement of the particle from mean position.)
A $$\omega \sqrt {{{\text{y}}^2} - {{\text{r}}^2}} $$
B $$\omega \sqrt {{{\text{r}}^2} - {{\text{y}}^2}} $$
C $${\omega ^2}\sqrt {{{\text{y}}^2} - {{\text{r}}^2}} $$
D $${\omega ^2}\sqrt {{{\text{r}}^2} - {{\text{y}}^2}} $$

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