MCQOPTIONS
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MCQOPTIONS
This section includes 206 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which property of the fluid offers resistance to deformation under the action of shear force? |
| A. | density |
| B. | viscosity |
| C. | permeability |
| D. | specific gravity |
| Answer» C. permeability | |
| 2. |
Which type of body is an airfoil? |
| A. | streamline body |
| B. | wave body |
| C. | bluff body |
| D. | induced body |
| Answer» B. wave body | |
| 3. |
Working principle of dead weight pressure gauge tester is based on_______________? |
| A. | Pascal’s law |
| B. | Dalton’s law of partial pressure |
| C. | Newton’s law of viscosity |
| D. | Avogadro’s hypothesis |
| E. | Second law of thermodynamic |
| Answer» B. Dalton’s law of partial pressure | |
| 4. |
Which of the following statements are true for dimensional analysis? 1. The functional relationship between dependent and non-dependent variables can be expressed into dimensionless terms by dimensional analysis 2. In model testing, it reduces the number of variables into three numbers 3. It is used to change the theoretical equation into dimensionless form 4. It helps to convert the units of quantities from one system to another system |
| A. | (1), (2) and (3) |
| B. | (2), (3) and (4) |
| C. | (1), (3) and (4) |
| D. | (1), (2), (3) and (4) |
| Answer» E. | |
| 5. |
Which of the following sentences are true for Bernoulli's equation? 1. Bernoulli's principle is applicable to ideal incompressible fluid 2. The gravity force and pressure forces are only considered in Bernoulli's principle 3. The flow of fluid is rotational for Bernoulli's principle 4. The heat transfer into or out of fluid should be zero to apply Bernoulli's principle |
| A. | (1), (2) and (3) |
| B. | (1), (3) and (4) |
| C. | (1), (2) and (4) |
| D. | (1), (2), (3) and (4) |
| Answer» D. (1), (2), (3) and (4) | |
| 6. |
Which of the following number is applicable in open hydraulic structure such as spillways, where gravitational force is predominant? |
| A. | Reynold's Number |
| B. | Euler's Number |
| C. | Weber's Number |
| D. | Froude's Number |
| Answer» E. | |
| 7. |
Which of the following meters is not associated with viscosity____________________? |
| A. | Red wood |
| B. | Say bolt |
| C. | Engler |
| D. | Orsat |
| E. | none of the above |
| Answer» E. none of the above | |
| 8. |
Which of the following manometer has highest sensitivity_________________? |
| A. | U-tube with water |
| B. | inclined U-tube |
| C. | U-tube with mercury |
| D. | micro-manometer with water |
| E. | displacement type |
| Answer» E. displacement type | |
| 9. |
Which of the following is not a primary quantity? |
| A. | Mass (M) |
| B. | Temperature (θ) |
| C. | Time (T) |
| D. | None of the above |
| Answer» E. | |
| 10. |
Which of the following is a dimensionless equation? |
| A. | Reynold's equation |
| B. | Euler's equation |
| C. | Weber's equation |
| D. | All of the above |
| Answer» E. | |
| 11. |
Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem_________________? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | nozzle |
| D. | pitot tube |
| E. | all of the above |
| Answer» F. | |
| 12. |
Which of the following instrument can be used for measuring speed of a submarine moving in deep sea__________________? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | hot wire anemometer |
| D. | rotameter |
| E. | pitot tube |
| Answer» F. | |
| 13. |
Which of the following instrument can be used for measuring speed of an aeroplane___________________? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | hot wire anemometer |
| D. | rotameter |
| E. | pitot tube |
| Answer» F. | |
| 14. |
Which of the following forces generally act on fluid while considering fluid dynamics? 1. Viscous force 2. Pressure force 3. Gravity force 4. Turbulent force 5. Compressibility force |
| A. | (1), (3), (4) and (5) |
| B. | (1), (2), (3) and (5) |
| C. | (1), (2), (3) and (4) |
| D. | (1), (2), (3), (4) and (5) |
| Answer» E. | |
| 15. |
Which of the following devices does not use Bernoulli's equation as its working principle? |
| A. | Venturimeter |
| B. | Orifice-meter |
| C. | Pitot tube |
| D. | None of the above |
| Answer» E. | |
| 16. |
Which branch of fluid mechanics deals with translation, rotation and deformation of the fluid element without considering the force and energy causing such motion is called as |
| A. | fluid dynamics |
| B. | fluid kinematics |
| C. | fluid kinetics |
| D. | hydraulics |
| Answer» C. fluid kinetics | |
| 17. |
Which acceleration has a nonzero value in uniform flow? |
| A. | Local acceleration |
| B. | Convective acceleration |
| C. | Both local as well as convective acceleration |
| D. | unpredictable |
| Answer» B. Convective acceleration | |
| 18. |
When the net force acting on a fluid is the sum of only gravity force, pressure force and viscous force, the equation is called as |
| A. | Reynold's equation of motion |
| B. | Navier-stockes equation of motion |
| C. | Euler's equation of motion |
| D. | none of the above |
| Answer» C. Euler's equation of motion | |
| 19. |
When the flow parameters at any given instant remain same at every point, then flow is said to be___________________? |
| A. | quasi static |
| B. | steady state |
| C. | laminar |
| D. | uniform |
| E. | static |
| Answer» E. static | |
| 20. |
When the angle between surface tension with the liquid (θ) is greater than 90o, the liquid becomes |
| A. | flat |
| B. | concave upward |
| C. | convex upward |
| D. | unpredictable |
| Answer» D. unpredictable | |
| 21. |
When is a liquid said to be not in a boiling or vaporized state? |
| A. | If the pressure on liquid is equal to its vapour pressure |
| B. | If the pressure on liquid is less than its vapour pressure |
| C. | If the pressure on liquid is more than its vapour pressure |
| D. | Unpredictable |
| Answer» D. Unpredictable | |
| 22. |
When a body floating in a liquid, is displaced slightly, it oscillates about _________________? |
| A. | e.g. of body |
| B. | center of pressure |
| C. | center of buoyancy |
| D. | metacentre |
| E. | liquid surface |
| Answer» E. liquid surface | |
| 23. |
What is the ratio of maximum velocity to average velocity, when the fluid is passing through two parallel plates and flow is laminar? |
| A. | 3/2 |
| B. | 2/3 |
| C. | 4/3 |
| D. | 3/4 |
| Answer» E. | |
| 24. |
What is the effect of free stream velocity on thickness of boundary layer? |
| A. | Increase in free stream velocity increases the boundary layer thickness |
| B. | Increase in free stream velocity decreases the boundary layer thickness |
| C. | The boundary layer thickness does not get affected by any change in free stream velocity |
| D. | unpredictable |
| Answer» C. The boundary layer thickness does not get affected by any change in free stream velocity | |
| 25. |
What is the effect of change in Reynold's number on friction factor in turbulent flow? |
| A. | As the Reynold's number increases the friction factor increases in turbulent flow |
| B. | As the Reynold's number increases the friction factor decreases in turbulent flow |
| C. | change in Reynold's number does not affect the friction factor in turbulent flow |
| D. | unpredictable |
| Answer» C. change in Reynold's number does not affect the friction factor in turbulent flow | |
| 26. |
What is temporal mean velocity? |
| A. | The average of velocities at a point over a certain period of time |
| B. | The average of velocities of a single particle over different locations in a fluid flow |
| C. | Both A & B |
| D. | None of the above |
| Answer» B. The average of velocities of a single particle over different locations in a fluid flow | |
| 27. |
What is an ideal fluid? |
| A. | A fluid which has no viscosity |
| B. | A fluid which is incompressible |
| C. | A fluid which has no surface tension |
| D. | All of the above |
| Answer» E. | |
| 28. |
What is a syphon? |
| A. | A long bend pipe used to carry water from a reservoir at a higher level to another reservoir at a lower level when two reservoirs are separated by a h |
| B. | A long bend pipe used to carry water from a reservoir at a lower level to another reservoir at a higher level with some work input when two reservoirs |
| C. | A long bend pipe used to carry water from one reservoir to another reservoir when two reservoirs are at same elevation |
| D. | Unpredictable |
| Answer» B. A long bend pipe used to carry water from a reservoir at a lower level to another reservoir at a higher level with some work input when two reservoirs | |
| 29. |
Viscosity of water in comparison to mercury is_________________? |
| A. | higher |
| B. | lower |
| C. | same |
| D. | higher/lower depending on temperature |
| E. | unpredictable |
| Answer» B. lower | |
| 30. |
Viscous forces are not present in |
| A. | rotational flow |
| B. | irrotational flow |
| C. | laminar flow |
| D. | none of the above |
| Answer» C. laminar flow | |
| 31. |
Units of surface tension are____________________? |
| A. | energy/unit area |
| B. | distance |
| C. | both of the above |
| D. | it has no units |
| E. | none of the above |
| Answer» D. it has no units | |
| 32. |
Uniform flow occurs when_____________________? |
| A. | the direction and magnitude of the velocity at all points are identical |
| B. | the velocity of successive fluid paiticles, at any point, is the same at successive periods of time |
| C. | the magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each pleasure |
| E. | velocity, depth, pressure, etc. change from point to point in the fluid flow |
| Answer» D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each pleasure | |
| 33. |
Uniform flow occurs when ___________________? |
| A. | the flow is steady |
| B. | the flow is streamline |
| C. | size and shape of the cross section in a particular length remain constant |
| D. | size and cross section change uniformly along length |
| E. | flow occurs at constant fate |
| Answer» D. size and cross section change uniformly along length | |
| 34. |
Two pipe systems can be said to be equivalent, when the following quantities are same__________________? |
| A. | friction loss and flow |
| B. | length and diameter |
| C. | flow and length |
| D. | friction factor and diameter |
| E. | velocity and diameter |
| Answer» B. length and diameter | |
| 35. |
Two dimensional flow occurs when________________? |
| A. | the direction and magnitude of the velocity at all points are identical |
| B. | the velocity of successive fluid particles, at any point, is the same at successive periods of time |
| C. | the magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane |
| E. | velocity, depth, pressure, etc. change from point to point in the fluid flow |
| Answer» E. velocity, depth, pressure, etc. change from point to point in the fluid flow | |
| 36. |
True one-dimensional flow occurs when_________________? |
| A. | the direction and magnitude of the veiocity at all points are identical |
| B. | the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time |
| C. | the magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane |
| E. | velocity, depth, pressure etc. change from point to point in the fluid flow |
| Answer» B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time | |
| 37. |
Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be_______________? |
| A. | 1000 kg |
| B. | 4000 kg |
| C. | 2000 kg |
| D. | 8000 kg |
| E. | 16000 kg |
| Answer» B. 4000 kg | |
| 38. |
To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than____________________? |
| A. | 2.4 m above the hydraulic gradient |
| B. | 6.4 m above the hydraulic gradient |
| C. | 10.0 m above the hydraulic gradient |
| D. | 5.0 above the hydraulic gradient |
| E. | none of the above |
| Answer» C. 10.0 m above the hydraulic gradient | |
| 39. |
To avoid an interruption in the flow of a syphon, an air vessel is provided__________________? |
| A. | at the inlet |
| B. | at the outlet |
| C. | at the summit |
| D. | ay nay point between inlet and outlet |
| E. | none of the above |
| Answer» D. ay nay point between inlet and outlet | |
| 40. |
The velocity of jet of water travelling out of opening in a tank filled with water is proportional to_________________? |
| A. | head of water (h) |
| B. | h2 |
| C. | V/T |
| D. | h2 |
| E. | h3/1 |
| Answer» D. h2 | |
| 41. |
The velocity gradients over the boundary layer are |
| A. | small |
| B. | large |
| C. | sometimes small and sometimes large |
| D. | cannot say |
| Answer» C. sometimes small and sometimes large | |
| 42. |
The vapour pressure over the concave surface is______________________? |
| A. | less man the vapour pressure over the plane surface |
| B. | equal to the vapour pressure over the plane surface |
| C. | greater than the vapour pressure over the plane surface |
| D. | zero |
| E. | none of the above |
| Answer» B. equal to the vapour pressure over the plane surface | |
| 43. |
The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to_________________? |
| A. | 1000 |
| B. | 2100 |
| C. | 2700 |
| D. | 10,000 |
| E. | 21,000 |
| Answer» F. | |
| 44. |
The value of mass density in kgsecVm4 for water at 0°C is_________________? |
| A. | 1 |
| B. | 1000 |
| C. | 100 |
| D. | 101.9 |
| E. | 91 |
| Answer» E. 91 | |
| 45. |
The upper surface of a weir over which water flows is known is_____________________? |
| A. | crest |
| B. | nappe |
| C. | sill |
| D. | weir top |
| E. | contracta |
| Answer» D. weir top | |
| 46. |
The units of dynamic or absolute viscosity are__________________? |
| A. | metres2 per sec |
| B. | kg sec/meter |
| C. | newton-sec per meter |
| D. | newton-sec2 per meter |
| E. | none of the above |
| Answer» D. newton-sec2 per meter | |
| 47. |
The units of kinematic viscosity are____________________? |
| A. | metres2 per sec |
| B. | kg sec/metre |
| C. | newton-sec per metre |
| D. | newton-sec per metre |
| E. | none of the above |
| Answer» B. kg sec/metre | |
| 48. |
The unit of physical quantity which does not depend on the unit of any other physical quantity is called as |
| A. | independent dimension |
| B. | fundamental dimension |
| C. | core dimension |
| D. | none of the above |
| Answer» C. core dimension | |
| 49. |
The two important forces for a floating body are__________________? |
| A. | buoyancy, gravity |
| B. | buoyancy, pressure |
| C. | buoyancy, inertial |
| D. | inertial, gravity |
| E. | gravity, pressure |
| Answer» B. buoyancy, pressure | |
| 50. |
The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be ________________? |
| A. | 500 kg |
| B. | 1000 kg |
| C. | 1500 kg |
| D. | 2000 kg |
| E. | 4000 kg |
| Answer» E. 4000 kg | |