MCQOPTIONS
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MCQOPTIONS
This section includes 243 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. |
Discharge capacity of the reciprocating pump is that of the centrifugal pump. |
| A. | higher than |
| B. | lower than |
| C. | same as |
| D. | unpredictable |
| Answer» C. same as | |
| 2. |
pump is also called as velocity pump. |
| A. | reciprocating |
| B. | rotary displacement |
| C. | centrifugal |
| D. | screw |
| Answer» D. screw | |
| 3. |
Pump transfers the mechanical energy of a motor or of an engine into of a fluid. |
| A. | pressure energy |
| B. | kinetic energy |
| C. | either pressure energy or kinetic energy |
| D. | pressure energy, kinetic energy or both |
| Answer» E. | |
| 4. |
Operation of reciprocating motion is done by a source |
| A. | power |
| B. | energy |
| C. | momentum |
| D. | inertia |
| Answer» B. energy | |
| 5. |
The fluid gains while passing through the impeller. |
| A. | velocity |
| B. | pressure |
| C. | temperature |
| D. | velocity and pressure |
| Answer» E. | |
| 6. |
The Prandtl Number approximates |
| A. | momentum diffusivity to thermal diffusivity |
| B. | thermal diffusivity to momentum diffusivity |
| C. | shear stress to thermal diffusivity |
| D. | thermal diffusivity to kinematic viscosity |
| Answer» B. thermal diffusivity to momentum diffusivity | |
| 7. |
into the chamber |
| A. | liquid |
| B. | pressure |
| C. | heat |
| D. | electricity |
| Answer» B. pressure | |
| 8. |
A circular pipe of radius 7 cm is used for water flow transmission. This pipe is moulded into another pipe with a square cross-section keeping the length same. (Ignore the thickness of the pipe). Calculate the hydraulic diameter of the moulded pipe. (Take π = 22/7). |
| A. | 11 cm |
| B. | 7 cm |
| C. | 3.5 cm |
| D. | 22 cm |
| Answer» B. 7 cm | |
| 9. |
When a problem states “The velocity of the water flow in a pipe is 20 m/s”, which of the following velocities is it talking about? |
| A. | rms velocity |
| B. | average velocity |
| C. | absolute velocity |
| D. | relative velocity |
| Answer» C. absolute velocity | |
| 10. |
ρV→. dS→ is positive when |
| A. | the mass flow is outward |
| B. | the mass flow is inward |
| C. | the mass flow is positive |
| D. | the mass flow is negative |
| Answer» B. the mass flow is inward | |
| 11. |
have the highest vane angle at inlet (β1 value)? |
| A. | slow runner |
| B. | medium runner |
| C. | fast runner |
| D. | vane angle is defined only for kaplan turbines and not francis turbines |
| Answer» D. vane angle is defined only for kaplan turbines and not francis turbines | |
| 12. |
What can be the maximum diameter of the pipe for the water flow of velocity 1 m/s (ν = 10-6) to be laminar in nature? Assume Lower critical Reynolds number to be 2100. |
| A. | 2.1 mm |
| B. | 21 mm |
| C. | 21 cm |
| D. | 0.21 mm |
| Answer» B. 21 mm | |
| 13. |
When the mechanical speed of the shaft increases beyond 110 percent, we use |
| A. | throttle governing |
| B. | steam governing |
| C. | nozzle governing |
| D. | emergency governing |
| Answer» E. | |
| 14. |
What is the purpose of a steam turbine governing? |
| A. | controls speed |
| B. | controls flow rate |
| C. | controls volume |
| D. | controls discharge |
| Answer» C. controls volume | |
| 15. |
What is the efficiency of the simple elbow type draft tube? |
| A. | 10 |
| B. | 30 |
| C. | 60 |
| D. | 90 |
| Answer» D. 90 | |
| 16. |
                             is a axial flow reaction turbines, if vanes are fixed to hub of turbine |
| A. | propeller turbine |
| B. | francis turbine |
| C. | kaplan turbine |
| D. | pelton turbine |
| Answer» B. francis turbine | |
| 17. |
                        is an inward radial flow reaction turbine? |
| A. | pelton turbine |
| B. | kaplan turbine |
| C. | francis turbine |
| D. | propeller turbine |
| Answer» D. propeller turbine | |
| 18. |
At present which is cheapest means of generating power |
| A. | thermal power |
| B. | nuclear power |
| C. | hydroelectric power |
| D. | electric power |
| Answer» D. electric power | |
| 19. |
A hydraulic coupling belongs to the category of |
| A. | energy absorbing machines |
| B. | energy generating machines |
| C. | power absorbing machines |
| D. | energy transfer machines |
| Answer» E. | |
| 20. |
2 AXIAL, RADIAL AND MIXED FLOW TURBINES. |
| A. | guide vane angle at inlet |
| B. | blade angle at inlet |
| C. | vane angle at inlet |
| D. | blade angle at outlet |
| Answer» B. blade angle at inlet | |
| 21. |
Which of the following runner types will have the highest vane angle at inlet (β1 value)? |
| A. | slow runner |
| B. | medium runner |
| C. | fast runner |
| D. | vane angle is defined only for kaplan turbines and not francis turbines |
| Answer» D. vane angle is defined only for kaplan turbines and not francis turbines | |
| 22. |
What is the water flow direction in the runner in a Francis turbine? |
| A. | axial and then tangential |
| B. | tangential and then axial |
| C. | radial and then axial |
| D. | axial and then radial |
| Answer» D. axial and then radial | |
| 23. |
Main application of liquid ring pump is in which of the following? |
| A. | low viscosity products |
| B. | heavily aerated liquids |
| C. | gentle treatment with high viscosity |
| D. | water treatment |
| Answer» C. gentle treatment with high viscosity | |
| 24. |
Discharge capacity of the reciprocating pump is                      that of the centrifugal pump. |
| A. | higher than |
| B. | lower than |
| C. | same as |
| D. | unpredictable |
| Answer» C. same as | |
| 25. |
Which of the following is/are not example/s of rotary displacement pumps? |
| A. | gear pump |
| B. | vane pump |
| C. | rotary piston pump |
| D. | centrifugal pump |
| Answer» E. | |
| 26. |
                       pump is also called as velocity pump. |
| A. | reciprocating |
| B. | rotary displacement |
| C. | centrifugal |
| D. | screw |
| Answer» D. screw | |
| 27. |
Rotary displacement pumps are suitable for handling |
| A. | oils |
| B. | gritty liquids |
| C. | both oils as well as gritty liquids |
| D. | granules |
| Answer» B. gritty liquids | |
| 28. |
Which of the following is NOT a type of positive displacement pumps? |
| A. | reciprocating pump |
| B. | rotary displacement pump |
| C. | centrifugal pump |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 29. |
Pump transfers the mechanical energy of a motor or of an engine into                    of a fluid. |
| A. | pressure energy |
| B. | kinetic energy |
| C. | either pressure energy or kinetic energy |
| D. | pressure energy, kinetic energy or both |
| Answer» E. | |
| 30. |
Which of the following centrifugal pumps has higher specific speed than the others? |
| A. | axial flow |
| B. | radial flow |
| C. | mixed flow |
| D. | all centrifugal pumps have same specific speed |
| Answer» B. radial flow | |
| 31. |
High pressure reciprocating pumps are generally from 1500 HP. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 32. |
Operation of reciprocating motion is done by a                  source |
| A. | power |
| B. | energy |
| C. | momentum |
| D. | inertia |
| Answer» B. energy | |
| 33. |
The inlet passage of water entry is controlled by |
| A. | head race |
| B. | gate |
| C. | tail race |
| D. | pump |
| Answer» C. tail race | |
| 34. |
Euler developed the head pressure equation in centrifugal pumps. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 35. |
What is a major advantage of centrifugal pump? |
| A. | cost |
| B. | simple in construction |
| C. | efficiency |
| D. | pump parameters |
| Answer» C. efficiency | |
| 36. |
The velocity imparted by the impeller is converted into |
| A. | pressure energy |
| B. | kinetic energy |
| C. | momentum |
| D. | potential energy |
| Answer» B. kinetic energy | |
| 37. |
When the casing in a centrifugal pump decelerates the flow, what increases? |
| A. | pressure |
| B. | temperature |
| C. | volume |
| D. | flow rate |
| Answer» B. temperature | |
| 38. |
What is the shape of the diffuser in the centrifugal pump? |
| A. | round |
| B. | dough nut |
| C. | rectangle |
| D. | cylindrical |
| Answer» C. rectangle | |
| 39. |
The fluid gains                    while passing through the impeller. |
| A. | velocity |
| B. | pressure |
| C. | temperature |
| D. | velocity and pressure |
| Answer» E. | |
| 40. |
Which among the following is not a type of jet engine? |
| A. | turbojet |
| B. | ramjet |
| C. | scramjet |
| D. | propulsive jet |
| Answer» E. | |
| 41. |
Through inlet orifices, which are facing the direction of motion of the ship, the water from the sea can be taken by the pump. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 42. |
Principle of fluid mechanics works on the utilization of |
| A. | accelerating mass |
| B. | volume |
| C. | work |
| D. | velocity |
| Answer» D. velocity | |
| 43. |
Which among the following is the standard symbol for Froude number? |
| A. | f |
| B. | fo |
| C. | fr |
| D. | f |
| Answer» D. f | |
| 44. |
Which among the following is the standard symbol for Atwood number? |
| A. | a |
| B. | ar |
| C. | ar |
| D. | a |
| Answer» B. ar | |
| 45. |
The rate at which the particles of fluid can spread is called |
| A. | surface tension |
| B. | diffusivity |
| C. | viscosity |
| D. | kinetics |
| Answer» C. viscosity | |
| 46. |
1 NEED FOR DIMENSIONAL ANALYSIS - METHODS OF DIMENSIONAL ANALYSIS |
| A. | botanical science |
| B. | zoological science |
| C. | chemistry |
| D. | physics |
| Answer» D. physics | |
| 47. |
The liquid flowing through a series of pipes can take up |
| A. | pipes of different diameters |
| B. | pipes of the same diameters only. |
| C. | single pipe only |
| D. | short pipes only |
| Answer» B. pipes of the same diameters only. | |
| 48. |
Which among the following does not depend on the friction factor? |
| A. | pipe diameter |
| B. | fluid density |
| C. | viscosity |
| D. | weight |
| Answer» E. | |
| 49. |
What is the instrument used for the automatic control scheme during the fluid flow? |
| A. | rotameters |
| B. | pulley plates |
| C. | rotary piston |
| D. | pilot static tube |
| Answer» E. | |
| 50. |
For a fully-developed pipe flow, how does the pressure vary with the length of the pipe? |
| A. | linearly |
| B. | parabolic |
| C. | exponential |
| D. | constant |
| Answer» B. parabolic | |