MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice. |
| A. | Equal to |
| B. | One-fourth |
| C. | One-third |
| D. | One-half |
| Answer» C. One-third | |
| 2. |
The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is |
| A. | 0.0116 stoke |
| B. | 0.116 stoke |
| C. | 0.0611 stoke |
| D. | 0.611 stoke |
| Answer» B. 0.116 stoke | |
| 3. |
When a body is placed over a liquid, it will sink down if |
| A. | Gravitational force is equal to the up-thrust of the liquid |
| B. | Gravitational force is less than the up-thrust of the liquid |
| C. | Gravitational force is more than the up-thrust of the liquid |
| D. | None of the above |
| Answer» D. None of the above | |
| 4. |
The pressure at a point in a fluid will not be same in all the directions when the fluid is |
| A. | Moving |
| B. | Viscous |
| C. | Viscous and static |
| D. | Viscous and moving |
| Answer» E. | |
| 5. |
The number of buckets on the periphery of a Pelton wheel is given by |
| A. | (D/2d) + 5 |
| B. | (D/2d) + 10 |
| C. | (D/2d) + 15 |
| D. | (D/2d) + 20 |
| Answer» D. (D/2d) + 20 | |
| 6. |
According to fan laws, for the fans having constant wheel diameters, the power demand varies |
| A. | Directly as fan speed |
| B. | Square of fan speed |
| C. | Cube of fan speed |
| D. | Square root of fan speed |
| Answer» D. Square root of fan speed | |
| 7. |
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 |
| Answer» D. Newton-sec² per meter | |
| 8. |
Hydrometer is used to determine |
| A. | Specific gravity of liquids |
| B. | Specific gravity of solids |
| C. | Specific gravity of gases |
| D. | Relative humidity |
| Answer» B. Specific gravity of solids | |
| 9. |
Unit of surface tension is |
| A. | Energy/unit area |
| B. | Velocity/unit area |
| C. | Both of the above |
| D. | It has no units |
| Answer» B. Velocity/unit area | |
| 10. |
The unit of surface tension is |
| A. | N/m |
| B. | N/m2 |
| C. | N/m3 |
| D. | N-m |
| Answer» B. N/m2 | |
| 11. |
The variation in the volume of a liquid with the variation of pressure is called its |
| A. | Surface tension |
| B. | Compressibility |
| C. | Capillarity |
| D. | Viscosity |
| Answer» C. Capillarity | |
| 12. |
One liter of water occupies a volume of |
| A. | 100 cm3 |
| B. | 250 cm3 |
| C. | 500 cm3 |
| D. | 1000 cm3 |
| Answer» E. | |
| 13. |
A flow is called super-sonic if the |
| A. | Velocity of flow is very high |
| B. | Discharge is difficult to measure |
| C. | Mach number is between 1 and 6 |
| D. | None of these |
| Answer» D. None of these | |
| 14. |
The specific weight of water in S.I. units is taken as |
| A. | 9.81 kN/m3 |
| B. | 9.81 × 103 N/m3 |
| C. | 9.81 × 10-6 N/mm3 |
| D. | Any one of these |
| Answer» E. | |
| 15. |
Specific weight of water in S.I. units is equal to |
| A. | 1000 N/m3 |
| B. | 10000 N/m3 |
| C. | 9.81 × 103 N/m3 |
| D. | 9.81 × 10⁶ N/m3 |
| Answer» D. 9.81 × 10⁶ N/m3 | |
| 16. |
A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to |
| A. | 10 kg |
| B. | 100 kg |
| C. | 1000 kg |
| D. | 1 kg |
| Answer» B. 100 kg | |
| 17. |
High specific speed of a pump implies it is |
| A. | Centrifugal pump |
| B. | Mixed flow pump |
| C. | Axial flow pump |
| D. | Any one of the above |
| Answer» D. Any one of the above | |
| 18. |
Medium specific speed of a pump implies it is |
| A. | Centrifugal pump |
| B. | Mixed flow pump |
| C. | Axial flow pump |
| D. | Any one of the above |
| Answer» C. Axial flow pump | |
| 19. |
Low specific speed of a pump implies it is |
| A. | Centrifugal pump |
| B. | Mixed flow pump |
| C. | Axial flow pump |
| D. | None of the above |
| Answer» B. Mixed flow pump | |
| 20. |
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal |
| A. | Ratio of inertial force to force due to viscosity |
| B. | Ratio of inertial force to force due to gravitation |
| C. | Ratio of inertial force to force due to surface tension |
| D. | All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity |
| Answer» E. | |
| 21. |
When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow. |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | None of these |
| Answer» B. More than | |
| 22. |
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. | waV / 2g |
| B. | waV / g |
| C. | waV² / 2g |
| D. | waV² / g |
| Answer» E. | |
| 23. |
According to fan laws, at constant pressure, the speed capacity and power vary |
| A. | Directly as the air or gas density |
| B. | Inversely as square root of density |
| C. | Inversely as density |
| D. | As square of density |
| Answer» C. Inversely as density | |
| 24. |
The shear stress between the two liquid layers is __________ proportional to the distance between two layers. |
| A. | Directly |
| B. | Inversely |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 25. |
The speed of a turbine runner is |
| A. | Directly proportional to H1/2 |
| B. | Inversely proportional to H1/2 |
| C. | Directly proportional to H3/2 |
| D. | Inversely proportional to H3/2 |
| Answer» B. Inversely proportional to H1/2 | |
| 26. |
The unit speed of the turbine runner is |
| A. | N/√H |
| B. | N/H |
| C. | N/H3/2 |
| D. | N/H² |
| Answer» B. N/H | |
| 27. |
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. | Sinθ |
| B. | 1/Sinθ |
| C. | Cos θ |
| D. | 1/Cosθ |
| Answer» C. Cos θ | |
| 28. |
Centrifugal pump is started with its delivery valve |
| A. | Kept fully closed |
| B. | Kept fully open |
| C. | Irrespective of any position |
| D. | Kept 50% open |
| Answer» B. Kept fully open | |
| 29. |
Axial flow pump is started with its delivery valve |
| A. | Kept fully closed |
| B. | Kept fully open |
| C. | Irrespective of any position |
| D. | Kept 50% open |
| Answer» C. Irrespective of any position | |
| 30. |
An error of 1% in measuring head over the apex of the notch (H) will produce an error of _________ in discharge over a triangular notch. |
| A. | 1 % |
| B. | 1.5 % |
| C. | 2 % |
| D. | 2.5 % |
| Answer» E. | |
| 31. |
The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch. |
| A. | Plus |
| B. | Minus |
| C. | Divide |
| D. | None of these |
| Answer» B. Minus | |
| 32. |
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. | μπ²NR/60t |
| B. | μπ²NR²/60t |
| C. | μπ²NR³/60t |
| D. | μπ²NR⁴/60t |
| Answer» E. | |
| 33. |
When a liquid is flowing through a pipe, the velocity of the liquid is |
| A. | Maximum at the centre and minimum near the walls |
| B. | Minimum at the centre and maximum near the walls |
| C. | Zero at the centre and maximum near the walls |
| D. | Maximum at the centre and zero near the walls |
| Answer» B. Minimum at the centre and maximum near the walls | |
| 34. |
According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain. |
| A. | Equal to |
| B. | Directly proportional |
| C. | Inversely proportional |
| D. | None of these |
| Answer» C. Inversely proportional | |
| 35. |
Power required to drive a centrifugal pump is directly proportional to _________ of its impeller. |
| A. | Diameter |
| B. | Square of diameter |
| C. | Cube of diameter |
| D. | Fourth power of diameter |
| Answer» E. | |
| 36. |
The property of a fluid which enables it to resist tensile stress is known as |
| A. | Compressibility |
| B. | Surface tension |
| C. | Cohesion |
| D. | Adhesion |
| Answer» D. Adhesion | |
| 37. |
A fluid whose viscosity does not change with the rate of deformation or shear strain is known as |
| A. | Real fluid |
| B. | Ideal fluid |
| C. | Newtonian fluid |
| D. | Non-Newtonian fluid |
| Answer» D. Non-Newtonian fluid | |
| 38. |
Property of a fluid by which its own molecules are attracted is called |
| A. | Adhesion |
| B. | Cohesion |
| C. | Viscosity |
| D. | Compressibility |
| Answer» C. Viscosity | |
| 39. |
The velocity at which the laminar flow stops, is known as |
| A. | Velocity of approach |
| B. | Lower critical velocity |
| C. | Higher critical velocity |
| D. | None of these |
| Answer» C. Higher critical velocity | |
| 40. |
The shear stress-strain graph for a Newtonian fluid is a |
| A. | Straight line |
| B. | Parabolic curve |
| C. | Hyperbolic curve |
| D. | Elliptical |
| Answer» B. Parabolic curve | |
| 41. |
In a forced vortex, the velocity of flow everywhere within the fluid is |
| A. | Maximum |
| B. | Minimum |
| C. | Zero |
| D. | Nonzero finite |
| Answer» E. | |
| 42. |
The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is _______ of the jet velocity, |
| A. | One-fourth |
| B. | One-half |
| C. | Three-fourth |
| D. | Double |
| Answer» C. Three-fourth | |
| 43. |
Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft? |
| A. | Hydraulic ram |
| B. | Hydraulic intensifier |
| C. | Hydraulic torque converter |
| D. | Hydraulic accumulator |
| Answer» D. Hydraulic accumulator | |
| 44. |
Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between |
| A. | Lift and resultant force |
| B. | Drag and resultant force |
| C. | Lift and tangential force |
| D. | Lift and drag |
| Answer» B. Drag and resultant force | |
| 45. |
The pressure of fluid due to hammer blow is |
| A. | Directly proportional to density of fluid |
| B. | Inversely proportional to density of fluid |
| C. | Directly proportional to (density)1/2 of fluid |
| D. | Inversely proportional to (density)1/2 of fluid |
| Answer» D. Inversely proportional to (density)1/2 of fluid | |
| 46. |
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. | Equal to |
| B. | Directly proportional |
| C. | Inversely proportional |
| D. | None of these |
| Answer» C. Inversely proportional | |
| 47. |
Cavitation is caused by |
| A. | High velocity |
| B. | High pressure |
| C. | Weak material |
| D. | Low pressure |
| Answer» E. | |
| 48. |
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/(H - hf ) |
| C. | (H + hf )/H |
| D. | H/(H + hf ) |
| Answer» B. H/(H - hf ) | |
| 49. |
The units of kinematic viscosity are |
| A. | cm²/sec |
| B. | kg sec/metre |
| C. | Newton-sec per metre |
| D. | Newton-sec per metre |
| Answer» B. kg sec/metre | |
| 50. |
A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is |
| A. | 2.89 kN |
| B. | 8.29 kN |
| C. | 9.28 kN |
| D. | 28.9 kN |
| Answer» C. 9.28 kN | |