If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is________________?

A. Less than 1
B. Between 1 and 100
C. 160
D. 200

The hydraulic grade line is_________________?

A. Always above the centre line of pipe
B. Never above the energy grade line
C. Always sloping downward in the direction of flow
D. All of the above

The wake_______________?

A. Always occurs before a separation point
B. Always occurs after a separation point
C. Is a region of high pressure intensity
D. None of the above

A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be__________________?

A. Less than 1 m/sec
B. 1 m/sec
C. 1.5 m/sec
D. 2 m/sec

The Prartdtl mixing length is_________________?

A. Zero at the pipe wall
B. Maximum at the pipe wall
C. Independent of shear stress
D. None of the above

The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is_______________?

A. 1/3 r
B. 1/2 r
C. 2/3 r
D. 3/4r

Separation of flow occurs when_________________?

A. The pressure intensity reaches a minimum
B. The cross-section of a channel is reduced
C. The boundary layer comes to rest
D. All of the above

The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to________________?

A. 0.1
B. 0.01
C. 0.001
D. 0.0001

In which of the following the friction drag is generally larger than pressure drag?

A. A circular disc or plate held normal to flow
B. A sphere
C. A cylinder
D. An airfoil

When an ideal fluid flows past a sphere________________?

A. Highest intensity of pressure occurs around the circumference at right angles to flow
B. Lowest pressure intensity occurs at front stagnation point
C. Lowest pressure intensity occurs at rear stagnation point
D. Total drag is zero