MCQOPTIONS
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MCQOPTIONS
This section includes 88 Mcqs, each offering curated multiple-choice questions to sharpen your Irrigation Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The only spillway among the following through which the discharge does not increase as fast as it increases in all others is _________________ |
| A. | chute spillway |
| B. | side-channel spillway |
| C. | ogee spillway |
| D. | shaft spillway |
| Answer» E. | |
| 52. |
Whenever the slope of chute changes from steeper to milder ____________________ curve shall be provided. |
| A. | a concave vertical curve |
| B. | a convex vertical curve |
| C. | a hyperbolic curve |
| D. | a parabolic curve |
| Answer» B. a convex vertical curve | |
| 53. |
The famous Bhakra dam of India is provided with ________________ |
| A. | trough spillway |
| B. | ogee spillway |
| C. | shaft spillway |
| D. | siphon spillway |
| Answer» B. ogee spillway | |
| 54. |
The side slope of approach channel of chute spillway is ___________________ |
| A. | 1:1 |
| B. | 1:1.5 |
| C. | 1:3 |
| D. | 1:2.5 |
| Answer» B. 1:1.5 | |
| 55. |
Which one of the following gate is not suitable for curved crests? |
| A. | Flush boards |
| B. | Tainter gates |
| C. | Drum gates |
| D. | Vertical lift gates |
| Answer» B. Tainter gates | |
| 56. |
The crest of a siphon spillway is fixed at ________________ |
| A. | full reservoir level |
| B. | dead storage level |
| C. | maximum water level |
| D. | top of the dam |
| Answer» B. dead storage level | |
| 57. |
The Froude number of a hydraulic jump is 5.5. The jump can be classified as ____________ |
| A. | a weak jump |
| B. | an oscillating jump |
| C. | rough and choppy jump |
| D. | steady jump |
| Answer» E. | |
| 58. |
The downstream apron of the ogee spillway is found to have a negligible effect on the coefficient of discharge when the value of ________________ |
| A. | (Hd + d) / He is less than 1.7 |
| B. | (Hd + d) / He exceeds 1.7 |
| C. | (Hd + d) / He is equal to 1 |
| D. | (Hd + d) / He is less than 1.33 |
| Answer» C. (Hd + d) / He is equal to 1 | |
| 59. |
The velocity of approach has found to be negligible effect upon discharge if ____________ |
| A. | the ratio H/Hd is more than 1.33 |
| B. | the ratio H/Hd is less than 1.33 |
| C. | the ratio H/Hd is equal to zero |
| D. | the ratio H/Hd is more than 1 |
| Answer» B. the ratio H/Hd is less than 1.33 | |
| 60. |
The surplus reservoir water after spilling over the crest of the spillway flows on the chute is __________________ |
| A. | parallel to the crest in a trough spillway |
| B. | parallel to the crest in a side-channel spillway |
| C. | perpendicular to the crest in a side-channel spillway |
| D. | obliquely to the crest in a chute spillway |
| Answer» C. perpendicular to the crest in a side-channel spillway | |
| 61. |
A siphon spillway in a concrete gravity dam is in the shape of ________________ |
| A. | U-shape |
| B. | Inverted U-shape |
| C. | Horizontal bend through the abutment |
| D. | Any straight line |
| Answer» C. Horizontal bend through the abutment | |
| 62. |
What is the satisfactory radius for the reverse bottom curve which is provided at the downstream end of the spillway? |
| A. | One-fourth of the spillway height |
| B. | Equal to the spillway height |
| C. | Half the value of the spillway height |
| D. | One-third of the spillway height |
| Answer» B. Equal to the spillway height | |
| 63. |
What is Bazin’s profile? |
| A. | Profile for the lower nappe of a free-falling jet |
| B. | The profile obtained for the upper nappe of a free-falling jet |
| C. | Crest profile |
| D. | Profile of both upper and lower nappe |
| Answer» B. The profile obtained for the upper nappe of a free-falling jet | |
| 64. |
What is the value of abutment contraction coefficient for square abutment with headwall perpendicular to the direction of flow? |
| A. | 0.2 |
| B. | 0.1 |
| C. | 0.02 |
| D. | 0.01 |
| Answer» B. 0.1 | |
| 65. |
The most common vertical lift gates in modern days is _________________ |
| A. | sliding gates |
| B. | free-roller gates |
| C. | stoney gates |
| D. | fixed wheel gates |
| Answer» E. | |
| 66. |
The working of Reinold’s gate is automatic. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 67. |
Which of the following plot is useful in determining the clearance for the spillway deck bridge and the top levels of walls on the side of the spillway? |
| A. | The coordinates of the lower nappe |
| B. | The coordinates of the upper nappe |
| C. | Both the coordinates of upper and lower nappe |
| D. | The origin or apex of crest |
| Answer» C. Both the coordinates of upper and lower nappe | |
| 68. |
Which of the following gate is also called flush boards? |
| A. | Dropping shutters |
| B. | Tainter gates |
| C. | Drum gates |
| D. | Vertical lift gates |
| Answer» B. Tainter gates | |
| 69. |
Which of the following is the simplest type of spillway which can be provided independently and at low costs? |
| A. | Ogee spillway |
| B. | Trough spillway |
| C. | Siphon spillway |
| D. | Saddle spillway |
| Answer» C. Siphon spillway | |
| 70. |
Calculate the effective length of the spillway which consists of 6 spans having a clear width of 10 m each. The thickness of each pier may be taken as 2.5 m and the total design head on the crest including velocity head is 16.3 m. Assuming 90° cut water nose piers and rounded abutments. |
| A. | 55 m |
| B. | 60 m |
| C. | 65 m |
| D. | 75 m |
| Answer» B. 60 m | |
| 71. |
If the spillway is constructed in continuation to the dam at one end, it may be called as ________ |
| A. | saddle weir |
| B. | flank weir |
| C. | waste weir |
| D. | temporary weir |
| Answer» C. waste weir | |
| 72. |
What is the assumption that is taken during the entire design of an overflow spillway? |
| A. | The upper and lower nappe is subjected to negative pressures |
| B. | The upper and lower nappe is subjected to full atmospheric pressure |
| C. | The upper and lower nappe is subjected to zero atmospheric pressure |
| D. | The upper and lower nappe is subjected to both positive and negative pressure |
| Answer» C. The upper and lower nappe is subjected to zero atmospheric pressure | |
| 73. |
The greater is the divergence from the streamline flow, greater is the contraction coefficient. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 74. |
The minimum slope of the chute is governed by the condition that _____________ |
| A. | the subcritical flow must be maintained |
| B. | the supercritical flow must be maintained |
| C. | a critical flow must be maintained |
| D. | maybe supercritical or subcritical flow is possible |
| Answer» C. a critical flow must be maintained | |
| 75. |
What is the approximate percentage of light reinforcement that is provided in the top of the reinforced concrete slabs at the base? |
| A. | 0.50% of the concrete area |
| B. | 0.45% of the concrete area |
| C. | 0.30% of the concrete area |
| D. | 0.25% of the concrete area |
| Answer» E. | |
| 76. |
A shaft spillway is located _______________________ |
| A. | inside the body of a gravity dam |
| B. | inside the upstream reservoir |
| C. | inside the downstream reservoir |
| D. | on the side flanks of the main dam |
| Answer» C. inside the downstream reservoir | |
| 77. |
The siphons installed within a gravity dam to spill the surplus reservoir water are known as ______________________ |
| A. | hooded type siphon spillway |
| B. | tilted outlet type siphon spillway |
| C. | both hooded and titled type siphon spillway |
| D. | shaft spillway |
| Answer» C. both hooded and titled type siphon spillway | |
| 78. |
The siphons installed over overflow dams constitute what are known as __________________ |
| A. | hooded type siphon spillway |
| B. | tilted outlet type siphon spillway |
| C. | discharge carriers |
| D. | baby siphons |
| Answer» B. tilted outlet type siphon spillway | |
| 79. |
Which of the following curve is provided when the slope of the chute changes from milder to steeper? |
| A. | Concave vertical curve |
| B. | Hyperbolic curve |
| C. | Convex vertical curve |
| D. | Straight plan |
| Answer» D. Straight plan | |
| 80. |
Calculate the freeboard for the top levels of the side walls if the mean velocity of water in the chute reach is 3.5 m/s and the mean depth of water in the chute reach under consideration is 4.7 m. |
| A. | 0.60 m |
| B. | 1 m |
| C. | 0.85 m |
| D. | 0.55 m |
| Answer» D. 0.55 m | |
| 81. |
The portion of a chute spillway which is known as its control structure is ________________ |
| A. | low ogee weir |
| B. | chute channel |
| C. | approach channel leading the water from the reservoir to the ogee weir |
| D. | silting basin at its bottom |
| Answer» B. chute channel | |
| 82. |
The type of spillway which is provided on narrow valleys where no side flanks are available is ____________________ |
| A. | ogee spillway |
| B. | chute spillway |
| C. | side-channel spillway |
| D. | straight drop spillway |
| Answer» D. straight drop spillway | |
| 83. |
The spillway which may sometimes be called as a waste weir is ______________________ |
| A. | an ogee spillway |
| B. | a trough spillway |
| C. | a shaft spillway |
| D. | a siphon spillway |
| Answer» C. a shaft spillway | |
| 84. |
The safety valve of a dam is its __________________ |
| A. | drainage gallery |
| B. | inspection gallery |
| C. | spillway |
| D. | outlet sluices |
| Answer» D. outlet sluices | |
| 85. |
An ungated spillway starts functioning as soon as the water level in the reservoir crosses the __________________ |
| A. | maximum reservoir level |
| B. | minimum reservoir level |
| C. | maximum conservation level |
| D. | full Supply level |
| Answer» D. full Supply level | |
| 86. |
Which of the following is the simplest type of spillway and may be constructed on small bunds or thin arch dams? |
| A. | Straight drop spillway |
| B. | Ogee spillway |
| C. | Shaft spillway |
| D. | Siphon spillway |
| Answer» B. Ogee spillway | |
| 87. |
Which of the following is a secondary safety arrangement? |
| A. | Safety valves |
| B. | Spillway gates |
| C. | Subsidiary spillway |
| D. | Energy dissipaters |
| Answer» D. Energy dissipaters | |
| 88. |
The spillway can be best built independently of the dam when there is _________________________ |
| A. | deep narrow gorge with steep slopes |
| B. | deep narrow gorge with gradual slopes |
| C. | wide gorge with a gradual slope |
| D. | wide valley with moderate slopes |
| Answer» B. deep narrow gorge with gradual slopes | |