**1. Which combination of the following statements about steady incompressible forced vortex flow is correct?**

P: Shear stress is zero at all points in the flow

Q: Vorticity is zero at all points in the flow

R: Velocity is directly proportional to the radius from the centre of the vortex

Q: Total mechanical energy per unit mass is constant in the entire flow field

A) P and Q

B) R and S

C) P and R

D) P and S

Ans: B

**2. Consider steady laminar incompressible axi-symmetric fully developed viscous flow through a straight circular pipe of constant cross – sectional area at Reynolds number of 5. The ration of inertia force to viscous force on a fluid particle is**

A) 5

B) 1 / 5

C) 0

D) ∞

Ans: A

**3. A phenomenon is modelled using N dimensional variable with K primary dimension. The number of non-dimensional variable is**

A) K

B) N

C) N – K

D) N + K

Ans: C

**4. The maximum velocity of a one dimensional incompressible fully developed viscous flow, between two fixed parallel plates is 6 m /s. The mean velocity (in m / s) of the flow is**

A) 2

B) 3

C) 4

D) 5

Ans: C

**5. A streamline and equipotential line in a flow field**

A) Are parallel to each other

B) Are perpendicular to each other

C) Intersect at an acute angle

D) An identical

Ans: B

**6. In order to have maximum power from a pelton turbine, the bucket speed must be**

A) Equal to the jet speed

B) Equal to half of the jet speed

C) Equal to twice the jet speed

D) Independent of the jet speed

Ans: B