91. A person standing on the bank of a canal drops a stone on the water surface. He notices that the disturbance on the water is not travelling upstream. This is because the flow in the canal is

1. 1. sub-critical

   
   
   

   2. super-critical

   
   
   

   3. steady

   
   
   

   4. uniform

   
   
   

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1. View Hint View Answer Discuss in Forum

   Velocity < V_critical.

   Correct Option: A

   Velocity < V_critical.

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92. Direct step method of computation for gradually varied flow is

1. 1. applicable to non-prismatic channels

   
   
   

   2. applicable to prismatic channels

   
   
   

   3. applicable to both prismatic and non-prismatic channels

   
   
   

   4. not applicable to both prismatic and non-prismatic channels

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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93. A mild-sloped channel is followed by a steep-sloped channel. The profiles of gradually varied flow in the channel are

1. 1. M₃, S₂

   
   
   

   2. M₃, S₃

   
   
   

   3. M₂, S₁

   
   
   

   4. M₂, S₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   Mild slope: y_n > y > y_c
   Steep slope: y_c > y > y_n
   ∴ It is m₂, S₂.

   Correct Option: D

   Mild slope: y_n > y > y_c
   Steep slope: y_c > y > y_n
   ∴ It is m₂, S₂.

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94. The flow in a rectangular channel is sub-critical. If width of the channel is reduced at a certain section, the water surface under no-choke condition will

1. 1. drop at a downstream section

   
   
   

   2. rise at a downstream section

   
   
   

   3. rise at an downstream section

   
   
   

   4. not undergo any change

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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95. Group I gives a list of devices and Group II gives the list of uses:—
    

    Group I	Group II
    P. Pitot tube	1. Measuring pressure in a pipe
    Q. Manometer	2. Measuring velocity of flow in a pipe
    R. Venturimeter	3. Measuring air and gas velocity
    S. Anemometer	4. Measuring discharge in a pipe

    
    The correct match of Group I with Group II is

1. 1. P-1, Q-2, R-4, S-3

   
   
   

   2. P-2, Q-1, R-3, S-4

   
   
   

   3. P-2, Q-1, R-4, S-3

   
   
   

   4. P-4, Q-1, R-3, S-2

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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