McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering , Mechanical Engineering .
Chapters
| 401. |
Hammer blow in pipe occurs when |
| A. | Flow of fluid through pipe is suddenly brought to rest by the closing of the valve |
| B. | Pipe bursts under high fluid pressure |
| C. | Flow of fluid through pipe is gradually brought to rest by the closing of valve |
| D. | Excessive leakage occurs in pipe |
| E. | Pipe is hit with hammer |
| Answer» A. Flow of fluid through pipe is suddenly brought to rest by the closing of the valve | |
| 402. |
The loss of pressure head for the laminar flow through pipes varies |
| A. | As the square of velocity |
| B. | Directly as the velocity |
| C. | As the inverse of the velocity |
| D. | None of the above |
| E. | None of the above |
| Answer» B. Directly as the velocity | |
| 403. |
The oscillatory motion of a ship or a boat about its longitudinal axis is designated as |
| A. | Vibration |
| B. | Pitching |
| C. | Simple harmonic motion |
| D. | Gyro-mtion |
| E. | Rolling |
| Answer» E. Rolling | |
| 404. |
The surface tension has the units |
| A. | Newtons/m |
| B. | Newtons/m2 |
| C. | Newtons/m2 |
| D. | Newtons |
| E. | None of the above |
| Answer» A. Newtons/m | |
| 405. |
A small-size nozzle is built into a Pelton turbine for directing its water jet towards the back of the bucket, so that machine can be stopped quickly, is known as |
| A. | Reverse nozzle |
| B. | Compensating nozzle |
| C. | Brake nozzle |
| D. | Any of the above |
| E. | None of the above |
| Answer» C. Brake nozzle | |
| 406. |
In case of Buttress dams, too steep slopes |
| A. | Increase the tendency to sliding |
| B. | Increase inclined stress at heel |
| C. | Increase tendency to over turning |
| D. | Increase tensile stress on upstream side of dam |
| E. | Increase stresses at heels only |
| Answer» A. Increase the tendency to sliding | |
| 407. |
The lift on the cylinder caused by the circulation is independent of |
| A. | velocity |
| B. | cylinder diameter |
| C. | magnitude of circulation |
| D. | None of the above |
| Answer» B. cylinder diameter | |
| 408. |
How many dimensionless parameters can be obtained for a physical phenomenon having 7 varieables involving 3 fundamental dimensions? |
| A. | 4 |
| B. | 3 |
| C. | 7 |
| D. | 10 |
| Answer» A. 4 | |
| 409. |
Essentially the gravity dam resists the loads to which it is exposed, due to its |
| A. | Volume |
| B. | Size |
| C. | Mass |
| D. | Gravity |
| E. | High tensile stress |
| Answer» C. Mass | |
| 410. |
The angle of divergence for the divergent cone of a venturimeter which will give most efficient conversion of kinetic energy is about |
| A. | 10 |
| B. | 12 |
| C. | 4 |
| D. | 6 |
| E. | 15 |
| Answer» D. 6 | |
| 411. |
Identify the incorrect statement. Apparent shear forces |
| A. | Depend upon molecular interchange of momentum |
| B. | Can never occur in frictionless fluid regardless of its motion |
| C. | May occur owing to cohesion when the fluid is at rest |
| D. | Can never occur when the fluid is at rest |
| E. | Depend upon cohesive forces |
| Answer» C. May occur owing to cohesion when the fluid is at rest | |
| 412. |
An air vessel is provided at the summit in a syphone to |
| A. | Maintain pressure difference |
| B. | Increase velocity |
| C. | Increase discharge |
| D. | Avoid an interruption in the flow |
| E. | Regulate the flow |
| Answer» D. Avoid an interruption in the flow | |
| 413. |
Bhakra dam is constructed on river |
| A. | Chambal |
| B. | Chenab |
| C. | Sutlej |
| D. | Beas |
| E. | Yamuna |
| Answer» C. Sutlej | |
| 414. |
The breaking up of a liquid into fine droplets by spraying is called |
| A. | Venturi effect |
| B. | Vaporization |
| C. | Carburetion |
| D. | Osmosis |
| E. | Atomization |
| Answer» E. Atomization | |
| 415. |
A rotameter should always be installed in |
| B. | vertical position |
| C. | inclined at 45? to vertical |
| D. | inclined at 30? to vertical |
| E. | horizontal position |
| Answer» B. vertical position | |
| 416. |
In case the adhesion between moleules of a fluid is greater than cohesion between fluid and the glass, then the free level of the fluid in glass tube dipped in the glass vessel will be |
| A. | Lower than the surface of the fluid |
| B. | Same as the surface of the fluid |
| C. | Dependent on atmospheric temperature |
| D. | Dependent on atmospheric pressure |
| E. | Higher than the surface of the fluid |
| Answer» A. Lower than the surface of the fluid | |
| 417. |
A fluid is a substance that |
| A. | expands until it fills its space |
| B. | is essentially incompressible |
| C. | has a viscosity that always decreases with temperature |
| D. | always moves when subjected to a shearing stress |
| E. | has a viscosity that always increases with temperature |
| Answer» D. always moves when subjected to a shearing stress | |
| 418. |
Which one of the following is not usually considered particular advantage of a Buttress dam? |
| A. | Due to thin section, the problem of temperature control is minimised. |
| B. | Economy in use of concrete |
| C. | Less uplift force |
| D. | The power house and switchyard etc. can be located between the buttresses |
| E. | Because of thin members, the volume changes are significant |
| Answer» E. Because of thin members, the volume changes are significant | |
| 419. |
When the rheogram is linear but does not pass through origin, fluid is said to be |
| A. | Newtonian |
| C. | Non-newtonian |
| D. | Bingham. |
| E. | Ideal plastic |
| Answer» D. Bingham. | |
| 420. |
Water turbines may be put in the decreasing order of specific speed as |
| A. | Propeller turbine, Reaction turbine Impulse turbine |
| B. | Pelton wheel, Francis turbine, Kaplan turbine |
| C. | Reaction turbine Impulse turbine Propeller turbine |
| D. | None of the above |
| E. | 3 |
| Answer» A. Propeller turbine, Reaction turbine Impulse turbine | |
| 421. |
Surge wave is an example of |
| A. | steady uniform flow |
| B. | steady non-uniform flow |
| C. | unsteady non-uniform flow |
| D. | unsteady uniform flow |
| Answer» C. unsteady non-uniform flow | |
| 422. |
The power output of a 10 : 1 scale model of a hydro turbine is measured to be 20 W. The power output in kW expected from the prototype is |
| A. | 2 |
| B. | 63 |
| C. | 200 |
| D. | 150 |
| E. | 100 |
| Answer» B. 63 | |
| 423. |
Pascal-second is the unit of |
| B. | surface |
| C. | kinematic viscosity |
| D. | pressure |
| E. | dynamic viscosity |
| Answer» E. dynamic viscosity | |
| 424. |
The resultant upward pressure of a fluid on a floating body is equal to the wirght of the fluid displaced by the body. This is known as |
| A. | Schmidt's hypothesis |
| B. | Archimedes principle |
| C. | Bernoulli's theorem |
| D. | Pascals law |
| E. | Reynolds principle |
| Answer» B. Archimedes principle | |
| 425. |
A control volume refers to |
| A. | A closed system |
| B. | An open system |
| C. | A isolated system |
| D. | A fixed region in space |
| E. | A specified mass |
| Answer» B. An open system | |
| 426. |
A piece of metal weights 10 kg in air and 8 kg in water. The specific gravity of the metal is |
| A. | 8 |
| B. | 0.8 |
| C. | 5 |
| D. | 10 |
| E. | 4 |
| Answer» C. 5 | |
| 427. |
The pressure force, in Newtons, on the 15 cm-dia, head light of an automobile travelling at 25 m/s is |
| A. | 10.4 |
| B. | 6.8 |
| C. | 4.8 |
| D. | 3.2 |
| E. | 5.6 |
| Answer» B. 6.8 | |
| 428. |
The ratio inertia forces/surface tension force gives a non-dimensional number known as |
| A. | Cauchy number |
| B. | Euler number |
| C. | Shround number |
| D. | Weber number |
| E. | Froude number |
| Answer» D. Weber number | |
| 429. |
Highest value of sliding factor may be expected in case of |
| A. | Concrete on gravel |
| B. | Concrete on fine gravel |
| C. | Concrete on sand |
| D. | Concrete on rock |
| E. | Concrete on clayey soil |
| Answer» D. Concrete on rock | |
| 430. |
An ideal flow of any liquid must fulfil |
| A. | Newton's second law of motion |
| B. | Countinuity equation |
| C. | Law of conservation of energy |
| D. | Bernulli's theorem |
| E. | The Newton's law of viscosity |
| Answer» B. Countinuity equation | |
| 431. |
A right circular cylinder open at the top is filled with liquid (specific gravity 1.2) and rotated about its vertical axis at such speed that half the liquid spills out. The pressure at centre of the bottom is |
| A. | One eighth of its value when cylinder was full |
| B. | Same as before rotation |
| C. | One fourth of its value when cylinder was full |
| D. | Zero |
| E. | Half of its value when cylinder was full |
| Answer» D. Zero | |
| 432. |
What pressure differential, in pascals, exists at the bottom of a 3 m vertical wall if the temperature inside is 20?C and outside it is -20?C. Assume equal pressures at the top |
| A. | 3 |
| B. | 15 |
| C. | 6 |
| D. | 9 |
| E. | 12 |
| Answer» C. 6 | |
| 433. |
The result of pressure of a liquid on the wetted surface of a rigid body is |
| A. | The single force which, acting at a point on that surface would produce the same effect on the body as the liquid pressure on it |
| B. | The single resultant force acting on the body |
| C. | The point where vertical component of resulting force is zero |
| D. | The single point where resultant horizontal force is zero |
| E. | None of the above |
| Answer» A. The single force which, acting at a point on that surface would produce the same effect on the body as the liquid pressure on it | |
| 434. |
Prandtl's mixing length hypothesis is based on |
| A. | eddy viscosity |
| B. | momentum exchange that occurs due to random motion |
| C. | similarity of turbulent flow pattern |
| D. | None of the above |
| Answer» B. momentum exchange that occurs due to random motion | |
| 435. |
The value of n in Manning's formula for flow through channel is expected to be least in case of |
| A. | Glass surfaces |
| B. | Unfinished cement surface |
| C. | Cement concrete finish |
| D. | Corrugated metals surface |
| E. | Vitrified clay. |
| Answer» A. Glass surfaces | |
| 436. |
The coefficient of discharge (Cd) of an orifice varies with |
| A. | Reynold number |
| B. | Weber number |
| C. | Froude number |
| D. | None of the above |
| Answer» A. Reynold number | |
| 437. |
In a mixed flow turbine water enters |
| A. | axially and leaves radially |
| B. | radially and leaves axially |
| C. | tangentially and leaves axially |
| D. | tangentially and leaves radially |
| Answer» B. radially and leaves axially | |
| 438. |
A bulb turbine is a |
| A. | high head high rpm turbine |
| C. | high head turbine |
| D. | medium head turbine |
| E. | low head turbine |
| Answer» E. low head turbine | |
| 439. |
For a given bed, roughness and discharge when the wetted perimeter is minimum, the which of the following is also minimum? |
| A. | hydraulic radius |
| B. | discharge |
| C. | cross-sectional area. |
| D. | velocity |
| Answer» C. cross-sectional area. | |
| 440. |
An imaginary line drawn through a flow field such that the tangent at any point gives the velocity vector at an instant is known as |
| A. | path line |
| B. | streak line |
| C. | steam line |
| D. | either of the above |
| Answer» C. steam line | |
| 441. |
Total drag on a body is the sum of |
| A. | friction drag and pressure drag |
| B. | pressure drag, velocity drag and friction drag |
| C. | 28 |
| D. | friction drag and velocity drag |
| E. | pressure drag and velocity drag |
| Answer» A. friction drag and pressure drag | |
| 442. |
Separation is caused by |
| A. | an adverse pressure gradient |
| B. | boundary layer thickness reducing to zero |
| C. | laminar flow changing to turbulent flow |
| D. | all of the above |
| Answer» A. an adverse pressure gradient | |
| 443. |
Air vessels in a reciprocating pump are fitted to |
| A. | Increase the opening speed of pump |
| B. | Reduce suction head |
| C. | Reduce the acceleration head |
| D. | Increase delivery head |
| E. | Smoothen delivery head |
| Answer» C. Reduce the acceleration head | |
| 444. |
In axial flow turbine |
| A. | It is possible to regulate the flow |
| B. | It is necessary that wheel should always run full |
| C. | Water admitted over part of the circumference |
| D. | Depends upon other factors |
| E. | Only part of the available head is converted into velocity before the water enters the wheel |
| Answer» D. Depends upon other factors | |
| 445. |
In which of the following cases it is possible for flow to occur from low pressure to high pressure? |
| A. | Flow through a converging section |
| B. | Adiabatic flow in a horizontal pipe |
| C. | Flow of liquid in a vertical pipe |
| D. | Flow of air downward in a pipe |
| E. | None of the above |
| Answer» A. Flow through a converging section | |
| 446. |
The speed of a submariue can be measured by |
| A. | Pitot tube |
| B. | Hot wire anemometer |
| C. | Pirani gauge |
| D. | Inclined manometer |
| E. | Any of the above |
| Answer» A. Pitot tube | |
| 447. |
In an open channel the discharge corresponding to critical depth is |
| A. | Minimum |
| B. | Maximum |
| C. | Zero |
| D. | Average |
| E. | None of the above |
| Answer» B. Maximum | |
| 448. |
Bernoulli's theorem deals with the principle of conservation of |
| A. | Force |
| B. | Hydraulic pressure |
| C. | Mass |
| D. | Energy |
| E. | Momentum |
| Answer» D. Energy | |
| 449. |
Two units are homologous when they are geometrically similar and have |
| A. | Same Reynolds number |
| B. | Same efficiency |
| C. | 51.3 |
| D. | Similar stream lines |
| E. | Same Froudes number |
| Answer» A. Same Reynolds number | |
| 450. |
Buoyant force is |
| A. | The resultant force acting on the body |
| B. | Resultant force on the body due to the fluid surrounding it |
| C. | Resultant of upthrust and gravity forces acting on the body |
| D. | Resultant of static weight of body and dynamic thrust of fluid |
| E. | Equal to the volume of liquid displaced by the body |
| Answer» E. Equal to the volume of liquid displaced by the body | |
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