l4l. The critical depth of flow in a most economical triangular channel section for
a discharge of I m³ /sec is given by
142.For a given specific energy E, the critical depth y𝒸 for a rectangular channel is given by y𝒸=(2/3)E
143. For the same specific force, the two depths at which a given discharge can
occur are called conjugate depths
144. The most common device for measuring discharge through channels is
venturi flume
145.If the specific energy at the upstream section of a rectangular channel is 3 m
and minimum specific energy is 2.5 m, the maximum height of jump without
causing afflux will be 0.50 m
146.In a 2 m wide rectangular channel uniform flow occurs at a depth of 2 m, the velocity of flow being √2 g m/sec. The height of jump which can be raised without causing afflux will be 0
147. When the slope of bottom of a channel rises in the direction of flow, it is called
adverse slope
148. For any channel section, the specific energy increases with
increase in depth of sub critical flow,decrease in depth of super critical
flow
149. Flow through a venturi flume is maximum when the depth at the throat is
two-third
150. For the slope of bottom of a channel to be mild, the normal depth should be
greater than critical depth
151. Super critical flow can occur in a a) channel with a mild slope
b) channel with a steep slope c) a horizontal channel
152. Analysis of a surge in open channels is carried out by using
continuity equation,momentum equation
153.The critical velocity for a flow of q m³/sec/metre width of a wide rectangular
channel is given by (qg)¹/³
154.The mild slope profile M₂ occurs for depth above critical but below normal
155.For a steep slope profile S₁, the type of flow will be subcritical
156.In case of flow through a triangular channel as shown in Fig., the Froude
number is given by
157.If Fᵣ is the Froude number for a flow in a triangular channel, then the Froude
number for same velocity and same depth of flow in rectangular channel will be
Fᵣ/√2
158.The flow profile under the gate as shown in Fig. is classified as
H₃
159. Which of the following Froude number range indicates a weak jump ?
1.7 to 2.5
160.The speed of an elementary wave in still liquid at depth y is given by
√gy
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