1. The highest efficiency is obtained with a channel of ............... section ?

circular

square

rectangular

trapezoidal

Answer: trapezoidal

Explanation:


2. Coefficient of velocity is defined as the ratio of ?

actual velocity of jet at vena contracta to the theoretical velocity

area of jet at vena contracta to the area of orifice

actual discharge through an orifice to the theoretical discharge

none of the above

Answer: actual velocity of jet at vena contracta to the theoretical velocity

Explanation:


3. The pressure less than atmospheric pressure is known as ?

suction pressure

vacuum pressure

negative gauge pressure

all of these

Answer: all of these

Explanation:


4. The power transmitted through the pipe is maximum when the head lost due to friction is equal ?

one-fourth of the total supply head

one-third of the total supply head

one-half of the total supply head

two-third of the total supply head

Answer: one-third of the total supply head

Explanation:


5. In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is ............. the head of water on the upstream side of weir ?

equal to

one-third

two-third

three-fourth

Answer: two-third

Explanation:


6. A flow in which the quantity of liquid flowing per second is not constant, is called ?

streamline flow

turbulent flow

steady flow

unsteady flow

Answer: unsteady flow

Explanation:


7. In open channels, the specific energy is the ?

total energy per unit discharge

total energy measured with respect to the datum passing through the bottom of the channel

total energy measured above the horizontal datum

kinetic energy plotted above the free surface of water

Answer: total energy measured with respect to the datum passing through the bottom of the channel

Explanation:


8. The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to ?

half the depth

half the breadth

twice the depth

twice the breadth

Answer: half the depth

Explanation:


9. The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called ?

surface tension

compressibility

capillarity

viscosity

Answer: viscosity

Explanation:


10. An air vessel is provided at the summit in a syphon to ?

avoid interruption in the flow

increase discharge

increase velocity

maintain pressure difference

Answer: avoid interruption in the flow

Explanation: