MCQOPTIONS
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MCQOPTIONS
This section includes 131 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as |
| A. | One dimensional flow |
| B. | Uniform flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» E. | |
| 102. |
Power operated pump in which only both sides engage the fluid displacement is called |
| A. | Froth pump |
| B. | Single acting |
| C. | Double acting |
| D. | Bicycle pump View Answer |
| Answer» D. Bicycle pump View Answer | |
| 103. |
The reaction turbine is one in which the available hydraulic energy is converted to kinetic energybefore the fluid enters the runner |
| A. | fully |
| B. | partially |
| C. | fully or partially |
| D. | fully and partially |
| Answer» C. fully or partially | |
| 104. |
To obtain maximum hydraulic efficiency of pelton turbine, blade velocity should be Times the inlet velocity of jet. |
| A. | Half |
| B. | One quarter |
| C. | Twice |
| D. | Thrice |
| Answer» B. One quarter | |
| 105. |
For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be |
| A. | 300 |
| B. | 337.5 |
| C. | 600 |
| D. | 675 |
| Answer» E. | |
| 106. |
The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is |
| A. | laminar flow |
| B. | transition flow |
| C. | turbulent flow |
| D. | not predictable from the given data |
| Answer» B. transition flow | |
| 107. |
In a Kaplan Turbine experimental setup, the power output of the shaft is 4.325 MW. The volume flow rate of water in 15 m3/s at an available head of 50 m. Find the overall efficiency of the turbine in % (g = 10 m/s2)? |
| A. | 57.66 |
| B. | 83.63 |
| C. | 81.33 |
| D. | 79.95 |
| Answer» B. 83.63 | |
| 108. |
A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm and a volume of 0.039 m3 at 150 kg/cm . The bulk modulus of elasticity of liquid is |
| A. | 400 kg/cm |
| B. | 4000 kg/cm |
| C. | 40 10 kg/cm |
| D. | 40 10 kg/cm |
| Answer» C. 40 10 kg/cm | |
| 109. |
95*40 = 38 m3/s. 358. In a Kaplan turbine experiment, the volumetric efficiency of a given turbine is 91%. If volume flow rate of water in given to be 35 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second? |
| A. | 4.05 |
| B. | 3.15 |
| C. | 3.30 |
| D. | 2.55 |
| Answer» C. 3.30 | |
| 110. |
The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of15 meters at 725r.p.m., is |
| A. | 24.8r.p.m. |
| B. | 48.2r.p.m. |
| C. | 82.4r.p.m. |
| D. | 248r.p.m. |
| Answer» D. 248r.p.m. | |
| 111. |
The volumetric efficiency of a given turbine is 80%. If volume flow rate of water in given to be 30 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second? |
| A. | 5 |
| B. | 6 |
| C. | 10 |
| D. | 12 |
| Answer» C. 10 | |
| 112. |
In the inlet velocity triangle of a Kaplan turbine, 1 = 45o. The velocity of flow at inlet = 10 m/s. Find the whirl velocity of water at the inlet of Kaplan turbine? |
| A. | 5 m/s |
| B. | 10 m/s |
| C. | 12.5 m/s |
| D. | 15 m/s |
| Answer» C. 12.5 m/s | |
| 113. |
A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury? |
| A. | The metal piece will simply float over the mercury |
| B. | The metal piece will be immersed in mercury by half |
| C. | Whole of the metal piece will be immersed with its top surface just at mercury level |
| D. | Metal piece will sink to the bottom |
| Answer» D. Metal piece will sink to the bottom | |
| 114. |
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as |
| A. | center of gravity |
| B. | center of buoyancy |
| C. | center of pressure |
| D. | metacentre |
| Answer» D. metacentre | |
| 115. |
The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is (where R is radius of pipe.) |
| A. | 0.223 R |
| B. | 0.423 R |
| C. | 0.577 R |
| D. | 0.707 R |
| Answer» B. 0.423 R | |
| 116. |
Volume flow rate of water in a Francis turbine runner is 25 m3/s. The flow velocity, whirl velocity and blade velocity are 11 m/s, 10 m/s and 5 m/s respectively, all values given at runner inlet. Find the power developed by the turbine. |
| A. | 25 kW |
| B. | 1.25 MW |
| C. | 1.25 kW |
| D. | 25 MW |
| Answer» C. 1.25 kW | |
| 117. |
An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to |
| A. | g/3 |
| B. | g/2 |
| C. | 2g/3 |
| D. | g |
| Answer» E. | |
| 118. |
The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is |
| A. | 1/2 |
| B. | 2/3 |
| C. | 3/2 |
| D. | 2 |
| Answer» B. 2/3 | |
| 119. |
The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is |
| A. | 1/3 |
| B. | 1/4 |
| C. | 1/2 |
| D. | 2/3 |
| Answer» B. 1/4 | |
| 120. |
A turbine works at 20 m head and speed of 500 rpm. Its 1:2 scale model to be tested at samehead should have a rotational speed of |
| A. | 1000rpm |
| B. | 750rpm |
| C. | 500rpm |
| D. | 250rpm |
| Answer» E. | |
| 121. |
Calculate the value of Froud s number if the ratio of rate of change of specific energy and rate ofchange of depth is 0.9. |
| A. | 0.29 |
| B. | 0.30 |
| C. | 0.31 |
| D. | 0.32 |
| Answer» D. 0.32 | |
| 122. |
Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is |
| A. | slightly less |
| B. | slightly more |
| C. | nearly half |
| D. | equal |
| Answer» B. slightly more | |
| 123. |
An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be |
| A. | 4 kN/m2 |
| B. | 10 kN/m2 |
| C. | 12 kN/m2 |
| D. | 14 kN/m2 |
| Answer» E. | |
| 124. |
The depth d below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow.) |
| A. | 0.423 D |
| B. | 0.577 D |
| C. | 0.223 D |
| D. | 0.707 D |
| Answer» C. 0.223 D | |
| 125. |
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be |
| A. | 2 metres of water column |
| B. | 3 metres of water column |
| C. | 3.5 metres of water column |
| D. | 4 m of water column |
| Answer» C. 3.5 metres of water column | |
| 126. |
When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is |
| A. | L/4 |
| B. | L/3 |
| C. | L/2 |
| D. | L |
| Answer» B. L/3 | |
| 127. |
The water pressure per metre length on a vertical masonry wall of dam is (where w = Specific weight of the liquid, and H = Height of the liquid) |
| A. | wH/2 |
| B. | wH |
| C. | wH2/2 |
| D. | wH2/4 |
| Answer» D. wH2/4 | |
| 128. |
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to empty the tank completely will be |
| A. | (2A H )/(Cd a 2g) |
| B. | (2AH )/(Cd a 2g) |
| C. | (2AH 3/2)/(Cd a 2g) |
| D. | (2AH )/(Cd a 2g) |
| Answer» B. (2AH )/(Cd a 2g) | |
| 129. |
When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis rad/s, then depth of parabola which the liquid assumes is |
| A. | .r/2g |
| B. | .r /2g |
| C. | .r/4g |
| D. | .r /4g |
| Answer» C. .r/4g | |
| 130. |
The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at ( ) rad/s about its vertical axis, is |
| A. | w r /4g |
| B. | w r /4g |
| C. | w r /4g |
| D. | w r /2g |
| Answer» D. w r /2g | |
| 131. |
The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy s coefficient of friction for pipe, and l = Length of pipe) |
| A. | d = (D /8fl)1/2 |
| B. | d = (D /8fl)1/3 |
| C. | d = (D /8fl)1/4 |
| D. | d = (D /8fl)1/5 |
| Answer» D. d = (D /8fl)1/5 | |