##### Q1. Orifices are used to measure

(a) velocity
(b) pressure
(c) rate of flow
(d) none of the above.

Ans: (c) rate of flow

##### Q2. Mouthpieces are used to measure

(a) velocity
(b) pressure
(c) viscosity
(d) rate of flow.

Ans:  (d) rate of flow.

##### Q3. Notch is a device used for measuring

(a) rate of flow through pipes
(b) rate of flow through a small channel
(c) velocity through a pipe
(d) velocity through a small channel.

Ans:  (b) rate of flow through a small channel

##### Q4. The discharge through a rectangular notch is given by

(a) Q =2/3Cd × L × H5/2
(b) Q = 2/3 Cd × L × H3/2
(c) Q = 2/3Cd × L × H5/2
(d) Q = 8/15 Cd × L × H3/2

Ans: (b) Q = 2/3 Cd × L × H3/2

##### Q5. The error in discharge due to the error in the measurement of head over a rectangular notch is given by

(a)dQ/Q= 5/2 dH/H
(b)dQ/Q= 3/2 dH/H
(c)dQ/Q= 7/2 dH/H
(d)dQ/Q= 1/2 dH/H

Ans:   (b)dQ/Q= 3/2 dH/H

##### Q6. The error in discharge due to the error in the measurement of head over a triangular notch is given by

(a)dQ/Q= 5/2 dH/H
(b)dQ/Q= 3/2 dH/H
(c) dQ/Q= 7/2 dH/H
(d)dQ/Q= 1/2 dH/H

Ans:  (a)dQ/Q= 5/2 dH/H

##### Q7. The velocity with which the water approaches a notch is called

(a) velocity of flow
(b) velocity of approach
(c) velocity of whirl
(d) none of the above.

Ans:  (b) velocity of approach

##### Q8. The velocity of approach (Va) is given by

(a) Va =Discharged over notch/Area of notch
(b) Va =Discharged over notch/Area of channel
(c) Va =Discharged over notch/Heat over notch × Width of channel
(d) none of the above

Ans:  (b) Va =Discharged over notch/Area of channel

##### Q9. Cipolletti weir is a trapezoidal weir having side slope of

(a) 1 horizontal to 2 vertical
(b) 4 horizontal to 1 vertical
(c) 1 horizontal to 4 vertical
(d) 1 horizontal to 3 vertical.

Ans:  (c) 1 horizontal to 4 vertical

##### Q10. The valve closure is said to be gradual if the time required to close the valve

(a) t = 2L/C
(b) t ≤2L/C
(c) t <4L/C
(d) t >2L/C
where L = Length of pipe, C = Velocity of pressure wave.

Ans:  (c) t <4L/C

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