Question 31 : For most economical rectangular section of a channel, the depth is kept
1. one-fourth of the width
2. half the width
3. three times the hydraulic radius
4. hydraulic mean depth
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Question 32 : When water flows over a rectangular suppressed weir, the negative pressure created beneath the nappe
1. decreases the discharge
2. increases the discharge
3. does not effect the discharge
4. none of these.
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Question 33 : The velocity of the fluid particle at the centre of the pipe section, is
1. none of these.
2. maximum
3. minimum
4. equal throughout
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Question 34 : If the forces are due to inertia and gravity, and frictional resistance plays only a minor role, the design of the channels is made by comparing
1. Froude number
2. Reynold number
3. Weber number
4. Mach number.
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Question 35 : Due to decrease of diameter of the droplet, inside pressure intensity
1. decreases
2. increases
3. remains unaffected
4. None of these.
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Question 36 : The main assumption of Bernoulli's equation is :
1. There is no loss of energy of the liquid while flowing
2. The velocity of energy of liquid particle, across any cross-section of a pipe is uniform
3. No external force except the gravity acts on the liquid
4. All
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Question 37 : Barometres are used to measure
1. very low pressure
2. difference in pressure at two points
3. pressure in water channels, pipes etc.
4. atmospheric pressure
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Question 38 : Cavitation is caused by
1. Low velocity
2. High pressure
3. Low pressure
4. High velocity
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Question 39 : Mach number is the ratio of inertia force to
1. viscosity
2. gravitational force
3. surface tension
4. elasticity
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Question 40 : A steady uniform flow is through
1. an expanding tube at increasing rate
2. a long pipe at decreasing rate
3. an expanding tube at constant rate
4. a long pipe at constant rate
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