MCQOPTIONS
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MCQOPTIONS
This section includes 905 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The tangential velocity of the water element having a free vortex is |
| A. | irectly proportional to its distance from the centre |
| B. | nversely proportional to its distance from the centre |
| C. | irectly proportional to its (distance)2 from the centre |
| D. | nversely proportional to its (distance)2 from the centre |
| Answer» C. irectly proportional to its (distance)2 from the centre | |
| 2. |
A large Reynold number is indication of |
| A. | mooth and streamline flow |
| B. | aminar flow |
| C. | teady flow |
| D. | ighly turbulent flow |
| Answer» E. | |
| 3. |
Motion of a liquid in a volute casing of a centrifugal pump is an example of |
| A. | otational flow |
| B. | adial |
| C. | orced spiral vortex flow |
| D. | piral vortex flow |
| Answer» E. | |
| 4. |
The product of mass and acceleration of flowing liquid is called |
| A. | nertia force |
| B. | iscous force |
| C. | ravity force |
| D. | ressure force |
| Answer» B. iscous force | |
| 5. |
When a body is placed over a liquid, it will float if |
| A. | ravitational force is equal to the up-thrust of the liquid |
| B. | ravitational force is less than the up-thrust of the liquid |
| C. | ravitational force is more than the up-thrust of the liquid |
| D. | one of the above |
| Answer» C. ravitational force is more than the up-thrust of the liquid | |
| 6. |
Which of the following instrument can be used for measuring speed of an aeroplane? |
| A. | enturimeter |
| B. | rifice plate |
| C. | itot tube |
| D. | otameter |
| Answer» D. otameter | |
| 7. |
The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe. |
| A. | ess than |
| B. | ore than |
| C. | qual to |
| D. | one of these |
| Answer» C. qual to | |
| 8. |
The flow in a pipe or channel is said to be non-uniform when |
| A. | he liquid particles at all sections have the same velocities |
| B. | he liquid particles at different sections have different velocities |
| C. | he quantity of liquid flowing per second is constant |
| D. | ach liquid particle has a definite path |
| Answer» C. he quantity of liquid flowing per second is constant | |
| 9. |
The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film) |
| A. | π²NR/60t |
| B. | π²NR²/60t |
| C. | π²NR³/60t |
| D. | π²NR⁴/60t |
| Answer» E. | |
| 10. |
When a liquid is flowing through a pipe, the velocity of the liquid is |
| A. | aximum at the centre and minimum near the walls |
| B. | inimum at the centre and maximum near the walls |
| C. | ero at the centre and maximum near the walls |
| D. | aximum at the centre and zero near the walls |
| Answer» B. inimum at the centre and maximum near the walls | |
| 11. |
According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain. |
| A. | qual to |
| B. | irectly proportional |
| C. | nversely proportional |
| D. | one of these |
| Answer» C. nversely proportional | |
| 12. |
The region between the separation streamline and the boundary surface of the solid body is known as |
| A. | ake |
| B. | rag |
| C. | ift |
| D. | oundary layer |
| Answer» B. rag | |
| 13. |
If the ratios of all the corresponding linear dimensions are equal, then the model and the prototype are said to have |
| A. | eometric similarity |
| B. | inematic similarity |
| C. | ynamic similarity |
| D. | one of these |
| Answer» B. inematic similarity | |
| 14. |
A flow whose streamline is represented by a curve, is called |
| A. | ne-dimensional flow |
| B. | wo-dimensional flow |
| C. | hree-dimensional flow |
| D. | our-dimensional flow |
| Answer» C. hree-dimensional flow | |
| 15. |
The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.) |
| A. | .A.N |
| B. | L.A.N |
| C. | L.A.N)/60 |
| D. | 2 L.A.N)/60 |
| Answer» E. | |
| 16. |
A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called |
| A. | teady flow |
| B. | niform flow |
| C. | treamline flow |
| D. | urbulent flow |
| Answer» D. urbulent flow | |
| 17. |
The speed of sound in a ideal gas varies directly as it’s |
| A. | bsolute temperature |
| B. | emperature |
| C. | ensity |
| D. | odulus of elasticity |
| Answer» B. emperature | |
| 18. |
The depth of the bucket for a Pelton wheel is generally _________ the diameter of jet. |
| A. | qual to |
| B. | .2 times |
| C. | .8 times |
| D. | ouble |
| Answer» C. .8 times | |
| 19. |
The width of the bucket for a Pelton wheel is generally ________ the diameter of jet. |
| A. | ouble |
| B. | hree times |
| C. | our times |
| D. | ive times |
| Answer» E. | |
| 20. |
A metal with specific gravity of 'a' floating in a fluid of same specific gravity 'a' will |
| A. | ink to bottom |
| B. | loat over fluid |
| C. | artly immersed |
| D. | e fully immersed with top surface at fluid surface |
| Answer» E. | |
| 21. |
Impulse turbine is generally fitted |
| A. | t the level of tail race |
| B. | ittle above the tail race |
| C. | lightly below the tail race |
| D. | bout 2.5 m above the tail race to avoid cavitations |
| Answer» C. lightly below the tail race | |
| 22. |
According to Bernoulli's equation for steady ideal fluid flow |
| A. | rinciple of conservation of mass holds |
| B. | elocity and pressure are inversely proportional |
| C. | otal energy is constant throughout |
| D. | he energy is constant along a streamline but may vary across streamlines |
| Answer» E. | |
| 23. |
Froude's number is the ratio of inertia force to |
| A. | ressure force |
| B. | lastic force |
| C. | ravity force |
| D. | urface tension force |
| Answer» D. urface tension force | |
| 24. |
The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is _______ of the jet velocity, |
| A. | ne-fourth |
| B. | ne-half |
| C. | hree-fourth |
| D. | ouble |
| Answer» C. hree-fourth | |
| 25. |
The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is |
| A. | .0116 stoke |
| B. | .116 stoke |
| C. | .0611 stoke |
| D. | .611 stoke |
| Answer» B. .116 stoke | |
| 26. |
When a body is placed over a liquid, it will sink down if |
| A. | ravitational force is equal to the up-thrust of the liquid |
| B. | ravitational force is less than the up-thrust of the liquid |
| C. | ravitational force is more than the up-thrust of the liquid |
| D. | one of the above |
| Answer» D. one of the above | |
| 27. |
The pressure at a point in a fluid will not be same in all the directions when the fluid is |
| A. | oving |
| B. | iscous |
| C. | iscous and static |
| D. | iscous and moving |
| Answer» E. | |
| 28. |
The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle θ with the jet is |
| A. | waV/2g) × sin θ |
| B. | waV/g) × sin θ |
| C. | waV²/2g) × sin 2θ |
| D. | waV²/g) × sin θ |
| Answer» D. waV²/g) × sin θ | |
| 29. |
Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in meters, and Hd = Delivery head in meters) |
| A. | QHs |
| B. | QHd |
| C. | Q (Hs - Hd) |
| D. | Q (Hs + Hd) |
| Answer» E. | |
| 30. |
The pressure of fluid due to hammer blow is |
| A. | irectly proportional to density of fluid |
| B. | nversely proportional to density of fluid |
| C. | irectly proportional to (density)1/2 of fluid |
| D. | nversely proportional to (density)1/2 of fluid |
| Answer» D. nversely proportional to (density)1/2 of fluid | |
| 31. |
An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank. |
| A. | qual to |
| B. | irectly proportional |
| C. | nversely proportional |
| D. | one of these |
| Answer» C. nversely proportional | |
| 32. |
The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe) |
| A. | H - hf )/H |
| B. | /(H - hf ) |
| C. | H + hf )/H |
| D. | /(H + hf ) |
| Answer» B. /(H - hf ) | |
| 33. |
In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 'θ'. Sensitivity of inclined tube to sensitivity of U-tube is equal to |
| A. | inθ |
| B. | /Sinθ |
| C. | os θ |
| D. | /Cosθ |
| Answer» C. os θ | |
| 34. |
Centrifugal pump is started with its delivery valve |
| A. | ept fully closed |
| B. | ept fully open |
| C. | rrespective of any position |
| D. | ept 50% open |
| Answer» B. ept fully open | |
| 35. |
Axial flow pump is started with its delivery valve |
| A. | ept fully closed |
| B. | ept fully open |
| C. | rrespective of any position |
| D. | ept 50% open |
| Answer» C. rrespective of any position | |
| 36. |
A fluid whose viscosity does not change with the rate of deformation or shear strain is known as |
| A. | eal fluid |
| B. | deal fluid |
| C. | ewtonian fluid |
| D. | on-Newtonian fluid |
| Answer» D. on-Newtonian fluid | |
| 37. |
The force exerted (in Newton) by a jet of water impinging normally on a fixed plate is (where w = Specific weight of water in N/m3, a = Cross-sectional area of jet in m², and V = Velocity of jet in m/s) |
| A. | aV / 2g |
| B. | aV / g |
| C. | aV² / 2g |
| D. | aV² / g |
| Answer» E. | |
| 38. |
According to fan laws, at constant pressure, the speed capacity and power vary |
| A. | irectly as the air or gas density |
| B. | nversely as square root of density |
| C. | nversely as density |
| D. | s square of density |
| Answer» C. nversely as density | |
| 39. |
The shear stress between the two liquid layers is __________ proportional to the distance between two layers. |
| A. | irectly |
| B. | nversely |
| C. | oth A and B |
| D. | one of these |
| Answer» C. oth A and B | |
| 40. |
Low specific speed of a pump implies it is |
| A. | entrifugal pump |
| B. | ixed flow pump |
| C. | xial flow pump |
| D. | one of the above |
| Answer» B. ixed flow pump | |
| 41. |
One liter of water occupies a volume of |
| A. | 00 cm3 |
| B. | 50 cm3 |
| C. | 00 cm3 |
| D. | 000 cm3 |
| Answer» E. | |
| 42. |
A flow is called super-sonic if the |
| A. | elocity of flow is very high |
| B. | ischarge is difficult to measure |
| C. | ach number is between 1 and 6 |
| D. | one of these |
| Answer» D. one of these | |
| 43. |
The specific weight of water in S.I. units is taken as |
| A. | .81 kN/m3 |
| B. | .81 × 103 N/m3 |
| C. | .81 × 10-6 N/mm3 |
| D. | ny one of these |
| Answer» E. | |
| 44. |
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 (ω) rad/s about its vertical axis, is |
| A. | w ω² r²/4g |
| B. | w ω² r³/4g |
| C. | w ω² r⁴/4g |
| D. | w ω² r²/2g |
| Answer» B. w ω² r³/4g | |
| 45. |
The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number) |
| A. | /RN |
| B. | /RN |
| C. | 6/RN |
| D. | 4/RN |
| Answer» D. 4/RN | |
| 46. |
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. | = (D⁵/8fl)1/2 |
| B. | = (D⁵/8fl)1/3 |
| C. | = (D⁵/8fl)1/4 |
| D. | = (D⁵/8fl)1/5 |
| Answer» D. = (D⁵/8fl)1/5 | |
| 47. |
Water is a __________ fluid. |
| A. | eal |
| B. | deal |
| C. | ewtonian |
| D. | on-Newtonian |
| Answer» D. on-Newtonian | |
| 48. |
The optimum value of vane exit angle for a centrifugal pump impeller is |
| A. | 0-15° |
| B. | 0-25° |
| C. | 0-40° |
| D. | 0-60° |
| Answer» C. 0-40° | |
| 49. |
A flow in which the viscosity of fluid is dominating over the inertia force is called |
| A. | teady flow |
| B. | nsteady flow |
| C. | aminar flow |
| D. | urbulent flow |
| Answer» D. urbulent flow | |
| 50. |
When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid |
| A. | emains horizontal |
| B. | ecomes curved |
| C. | alls on the front end |
| D. | alls on the back end |
| Answer» D. alls on the back end | |