1. Bluff body is the body of such a shape that pressure drag as compared to friction drag is ?

same

more

less

zero

Answer: more

Explanation:


2. For best hydraulic rectangular cross-section of an open channel, its depth should be equal to ?

width

two times the width

half of the width

three-eighth of the width

Answer: half of the width

Explanation:


3. The value of coefficient of velocity for a sharp edged orifice is of the order of ?

0.45

0.5

0.62

None of these

Answer: None of these

Explanation:


4. When a liquid rotates at constant angular velocity about a vertical axis as a rigid body, the pressure ?

increases linearly as its radial distance

varies inversely as the altitude along any vertical line

varies as the square of the radial distance

decreases as the square of the radial distance

Answer: varies as the square of the radial distance

Explanation:


5. The discharge through a semi-circular weir is proportional ?

H (-1/2)

H (1/2)

H ( 3/2)

None of these

Answer: H ( 3/2)

Explanation:


6. The rate of change of moment of momentum represents the ?

force exerted by fluid

torque applied by the fluid

work done by the fluid

power developed by the fluid

Answer: torque applied by the fluid

Explanation:


7. Separation of flow occurs when pressure gradient ?

tends to approach zero

becomes negative

reduces to a value when vapour formation starts

None of these

Answer: None of these

Explanation:


8. The ratio of actual discharge to theoretical discharge through an orifice is ?

Cc/Dd

Cd/Cv

Cv/Cd

CcCv

Answer: CcCv

Explanation:


9. Coke is produced by ?

pulverizing coal in inert atmosphere

heating wood in a limited supply of air at temperatures below 300°C

strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

binding the pulverized coal into briquettes

Answer: strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

Explanation:


10. One kg of steam sample contains 0.8 kg dry steam; it’s dryness fraction is ?

0.2

0.8

0.6

0.5

Answer: 0.8

Explanation: