McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering , Mechanical Engineering .
Chapters
| 401. |
The velocity in a 2 cm-diameter pipe is 20 m/s. If the pipe enlarges to 5 cm diameter velocity, in m/s, will be |
| A. | 6.4 |
| B. | 5.2 |
| C. | 3.2 |
| D. | 4.8 |
| E. | 8 |
| Answer» C. 3.2 | |
| 402. |
For hydrodynamically rough boundary the friction coefficient |
| A. | Depends on velocity and relative roughness |
| B. | Varies with Reynold's number |
| C. | Depends on Reynolds number, pressure gradient and relative roughness |
| D. | Remains constant |
| E. | Depends on relative roughness |
| Answer» E. Depends on relative roughness | |
| 403. |
In turbulent flow |
| A. | Cohesion is more effective than momentum transfer in causing shear stress |
| B. | Momentum transfer is on a molecular scale only |
| C. | One lamina of fluid flides smoothly over another |
| D. | Shear stresses are generally larger than in similar laminar flow |
| E. | The fluid particles move in an orderly manner |
| Answer» D. Shear stresses are generally larger than in similar laminar flow | |
| 404. |
If a barometer carries wter instead of mercury, the height of column for a pressure equivalent to 75 cm of mercury will be |
| A. | 1034 cm |
| B. | 1040 cm |
| C. | 1000 cm |
| D. | 1050 cm |
| E. | 1020 cm |
| Answer» E. 1020 cm | |
| 405. |
In which of the following case of modelling, Reynold number will be used for studying? |
| A. | Hydraulic jump |
| B. | Flow configuration of harbours |
| C. | Flow of castor oil through pipes |
| D. | All of the above |
| Answer» C. Flow of castor oil through pipes | |
| 406. |
A hydro-electric site has a head of 100 m and an average discharge of 10m3/s. Assume 92% efficiency, for a greater speed of 6000 rpm, the specific speed of turbine would be |
| A. | 600 |
| B. | 1000 |
| C. | 1500 |
| D. | 1900 |
| E. | None of the above |
| Answer» A. 600 | |
| 407. |
The units of kinematic viscosity are |
| A. | kg/m2-sec |
| B. | kg sec/m2 |
| C. | m kg/sec. |
| D. | m2/sec |
| E. | m/kg sec |
| Answer» D. m2/sec | |
| 408. |
Bluff body |
| A. | Surface is smooth so that friction can be neglected |
| B. | Surface does not coincide with stream lines |
| C. | Surface perpendicular to stream lines |
| D. | 8.3 |
| E. | Surface coincides with stream lines |
| Answer» B. Surface does not coincide with stream lines | |
| 409. |
The horizontal component of force on a curved surface is equal to the |
| A. | Scalar sum of all elemented horizontal components |
| B. | Product of pressure at its centroid and area |
| C. | Weight of liquid retained by the curved surface |
| D. | Weight of liquid vertically above the curved surface |
| E. | Force on a projection of the curved surface into a vertical plane |
| Answer» E. Force on a projection of the curved surface into a vertical plane | |
| 410. |
Froude number is useful in calculations for |
| A. | Hydraulic jump |
| B. | Surface tension force |
| C. | Flow through pipes |
| D. | Compressible flow problems |
| E. | Water hammer |
| Answer» A. Hydraulic jump | |
| 411. |
Manning's formula is used to determine |
| A. | Friction head loss in irregular sections |
| B. | Discharge through weirs and notches |
| C. | Friction head loss in open channels |
| D. | Friction hed loss in pipes running full |
| E. | Friction head loss in pipes running partially full |
| Answer» C. Friction head loss in open channels | |
| 412. |
A 2 cm dia. Pipe transports water at 20 m/s. If it exits out 100 small 2 mm dia. Holes, the existing velocity, in m/s will be |
| A. | 80 |
| B. | 40 |
| C. | 120 |
| D. | 10 |
| E. | 20 |
| Answer» E. 20 | |
| 413. |
The angle of contact (0) between water and glass tube in case of capillary rise is equal to |
| A. | 90? |
| B. | 128? |
| C. | 10? |
| D. | 157? |
| E. | 0? |
| Answer» E. 0? | |
| 414. |
In case the velocity vector at different points along a stream line remains unchanged then the flow is termed as |
| A. | Irrotational flow |
| B. | Uniform flow |
| C. | Stoke's flow |
| E. | Rotational flow |
| Answer» B. Uniform flow | |
| 415. |
The depth of oil having specific gravity 0.6 to produce a pressure of 3.6 kg/cm2 will be |
| A. | 36 m of oil |
| B. | 50 m of oil |
| C. | 60 m of oil |
| D. | 40 m of oil |
| E. | 120 m of oil |
| Answer» C. 60 m of oil | |
| 416. |
A flow in which each liquid particle has a definite path and their paths do not cross each other is called |
| A. | Steady flow |
| B. | Uniform flow |
| C. | Stream line flow |
| D. | Turbulent flow |
| E. | None of the above |
| Answer» C. Stream line flow | |
| 417. |
The losses in an open channel vary |
| A. | Inversely as the hydraulic radius |
| B. | As the velocity |
| C. | Inversely with a gradient |
| D. | As the square of velocity |
| E. | As the cube of velocity |
| Answer» D. As the square of velocity | |
| 418. |
The existence of velocity potential in fluid indicates that |
| A. | the flow is rotational |
| B. | the vorticity must be non-zero |
| C. | the circulation around any closed curve must have a definite value |
| E. | the vorticity must be zero |
| Answer» E. the vorticity must be zero | |
| 419. |
Pressure drag results from |
| A. | 10 |
| B. | Deformation drag |
| C. | development |
| D. | Skin friction |
| E. | Occurrence of a wake |
| Answer» E. Occurrence of a wake | |
| 420. |
Density in terms of viscosity is |
| A. | Kinematic viscosity/Dynamic viscosity |
| B. | Dynamic viscosity/Kinematic viscosity |
| C. | Kinematic viscosity x dynamic viscosity |
| D. | Any of the above |
| E. | None of the above |
| Answer» B. Dynamic viscosity/Kinematic viscosity | |
| 421. |
In axial flow turbines |
| A. | Water enters radially but leaves axially |
| B. | Water enters axially but leaves radially |
| C. | Water enters at an angle but leaves axially |
| D. | Water enters axially and leaves axially |
| E. | None of the above |
| Answer» D. Water enters axially and leaves axially | |
| 422. |
A low pressure of the order of 10-10 torr is to be measured in a chamber. Which of the following device can be used for this? |
| A. | McLeod gauge |
| B. | Pirani gauge |
| C. | Manometer |
| D. | Bourdon vacuum gauge |
| E. | Ionisation chamber |
| Answer» E. Ionisation chamber | |
| 423. |
When the dynamic viscosity of a fluid is 0.6 poise and specific gravity is 0.6, the kinematic viscosity of that fluid will be |
| A. | 0.36 poise |
| B. | 0.6 poise |
| C. | 1 poise |
| D. | None of the above |
| E. | More than 20? |
| Answer» C. 1 poise | |
| 424. |
The centre of pressure of a fully submerged body is almost always located |
| B. | above the centroid |
| C. | at the centroid |
| D. | closer to the centroid |
| E. | bolow the centroid |
| Answer» C. at the centroid | |
| 425. |
If 1% error is encountered in the measurement of head over crest of a rectangular weir, the error in discharge will be nearly |
| A. | 5% |
| B. | 1% |
| C. | 2% |
| E. | 1.50% |
| Answer» E. 1.50% | |
| 426. |
A hot wire anemometer is used for the measurement of |
| A. | Viscosity of liquids |
| B. | Viscosity of gases |
| C. | Pressure of gases |
| D. | Density of liquids |
| E. | Velocity of gases |
| Answer» E. Velocity of gases | |
| 427. |
Koyna dam is located in |
| A. | Gujrat |
| B. | Maharashtra |
| C. | Rajasthan |
| D. | Madhya Pradesh |
| E. | Karnataka |
| Answer» B. Maharashtra | |
| 428. |
Spouting velocity is |
| A. | Ideal velocity of jet |
| B. | 50% of ideal velocity of jet |
| C. | Actual velocity of jet |
| D. | Velocity of jet under some specified conditions |
| E. | None of the above |
| Answer» A. Ideal velocity of jet | |
| 429. |
A concrete masonry block on a hill side for supporting and fixing the penstock is known as |
| A. | Anchor block |
| B. | Support block |
| C. | Concrete block |
| D. | Base block |
| E. | Any of the above |
| Answer» A. Anchor block | |
| 430. |
The capillary rise in a narrow two-dimensional slit of width 'W' is |
| B. | helf of that in a capillary tube of diameter 'W' |
| C. | two-thirds of that in a capillary tube of diameter 'W' |
| D. | One-third of that in a capillary tube of diameter 'W' |
| E. | One-fourth of that in a capillary tube of diameter 'W' |
| Answer» B. helf of that in a capillary tube of diameter 'W' | |
| 431. |
The wake |
| A. | always occurs after a separation point |
| B. | is a region of high pressure intensity |
| C. | always occurs before and after separation point. |
| D. | always occurs before a separation point |
| Answer» A. always occurs after a separation point | |
| 432. |
At point A in a pipe line carrying water the diameter is 1 m, the pressure 98 kPa and the velocity 1 m/s. At point B, 2 m higher than A, the diameter is 0.5 m and the pressure 20 kPa. The direction of flow would be |
| A. | A to B |
| B. | B to A |
| C. | Cannot be ascertained from data |
| E. | None of the above |
| Answer» A. A to B | |
| 433. |
In which contact condition case the value of coefficient of friction is expected to be highest? |
| A. | Steel on steel |
| B. | Steel on steel with two layers of graphite service in between |
| C. | Steel on concrete |
| D. | Steel on steel, greased plates |
| E. | Packing and liner |
| Answer» C. Steel on concrete | |
| 434. |
Stanton diagram is a plot of |
| A. | log of friction factor against log of Reynolds number |
| B. | friction factor against Reynolds number |
| C. | friction factor against log of Reynolds number |
| E. | log of friction factor against Reynolds number |
| Answer» A. log of friction factor against log of Reynolds number | |
| 435. |
A body floats in stable equilibrium |
| A. | When the C.G. of body is below the centre of buoyancy |
| B. | When the metacentre is below C.G. |
| C. | When the C.G. of body is above the surface of water |
| D. | When the metacentric height is zero |
| E. | When the metacentre is above C.G. |
| Answer» E. When the metacentre is above C.G. | |
| 436. |
Which two forces are most important in floating bodies |
| A. | Viscous, buoyancy |
| B. | Gravity, inertial |
| C. | Pressure, viscous |
| D. | Buoyancy, gravity |
| E. | Inertial, pressure |
| Answer» D. Buoyancy, gravity | |
| 437. |
Capillarity is due to |
| A. | Adhesion |
| B. | Adhesion and cohesion |
| C. | Gravity |
| D. | Cohesion |
| E. | Molecular structure |
| Answer» B. Adhesion and cohesion | |
| 438. |
Capillary action is due to the |
| A. | Viscosity of liquid |
| B. | Cohesion of liquid particles |
| C. | Surface tension |
| D. | Adhesion of liquid particles on the surface |
| E. | None of the above |
| Answer» C. Surface tension | |
| 439. |
Capacity of a hydro-electric plant in service in excess of the peak load is known as |
| A. | Peak reserve |
| B. | Hot reserve |
| C. | Spinning reserve |
| D. | Cold reserve |
| E. | Operating reserve |
| Answer» E. Operating reserve | |
| 440. |
Mach number is significant in |
| A. | Flow in space above the atmosphere of air |
| B. | High speed flow of water |
| C. | Flow of highly viscous fluids |
| D. | Flow of metallic fluids |
| E. | Flow in air at speeds more than that of sound |
| Answer» E. Flow in air at speeds more than that of sound | |
| 441. |
Critical speed of turbine is |
| A. | Same as maximum operating speed |
| B. | Same as run away speed |
| C. | The speed equal to synchronous speed of generator |
| D. | The speed at which shaft will break |
| E. | The speed at which the number of natural vibrations or natural frequency equals the number of revolutions per minute |
| Answer» E. The speed at which the number of natural vibrations or natural frequency equals the number of revolutions per minute | |
| 442. |
The disadvantage of burried penstocks is |
| A. | Protection against freezing of conveyed water |
| B. | Protection against earthquake shock |
| C. | Difficulty in repair and maintenance |
| D. | Immunity against rock sides, avalanches and falling tree |
| E. | Protection against effect of temperature because of soil cover |
| Answer» C. Difficulty in repair and maintenance | |
| 443. |
When a venturimeter is used in an inclined position, it will show |
| A. | Sale reading |
| B. | More reading |
| C. | Less reading |
| D. | Depends on vescosity of fluid |
| E. | None of the above |
| Answer» A. Sale reading | |
| 444. |
The dynamic viscosity of most of the gases with rise in gas temperature |
| A. | Increses inversely as ?T |
| B. | Decreases |
| C. | Increases |
| D. | Does not change significantly |
| E. | Increases as ?T |
| Answer» C. Increases | |
| 445. |
Two units are homologous when they are geometrically similar and have |
| A. | Similar stream lines |
| B. | Same Froud's number |
| C. | Same efficiency |
| D. | Same Reynolds number |
| E. | None of these answers |
| Answer» D. Same Reynolds number | |
| 446. |
Select a common dimensionless parameter in fluid mechanics from the following |
| A. | Kinematic viscosity |
| B. | Specific gravity |
| C. | Specific weight |
| D. | Angular velocity |
| E. | None of the these answers |
| Answer» B. Specific gravity | |
| 447. |
The state in which Hirakund dam is established is |
| A. | Madhya Pardesh |
| B. | Uttar Pradesh |
| C. | Bihar |
| D. | Orissa |
| E. | West Bengal |
| Answer» D. Orissa | |
| 448. |
What pressure, in Mpa, must be maintained in a diving bell, at a depth of 1200 m, to keep out the ocean water (S = 1.03) |
| A. | 12.1 |
| B. | 1.24 |
| C. | 5.16 |
| D. | 14.3 |
| E. | 9.32 |
| Answer» A. 12.1 | |
| 449. |
The most efficient cross-section for a channel is |
| A. | Half hexagon in the form of a trapezoid |
| B. | Rectangular |
| C. | Square |
| D. | Triangular |
| E. | Semi-circular |
| Answer» A. Half hexagon in the form of a trapezoid | |
| 450. |
The locus of elevations that water will rise in a series of pitot tube is called |
| A. | the energy grade line |
| B. | the velocity head |
| C. | the hydraulic grade line |
| D. | the head loss |
| E. | the pressure head |
| Answer» A. the energy grade line | |
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