MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 265 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 of the following statements is true for a proportional valve? |
| A. | spool of the proportional valve can travel maximum length |
| B. | digital type of functioning is possible in proportional valve |
| C. | proportional valve requires a separate flow control valve |
| D. | all of the above |
| Answer» B. digital type of functioning is possible in proportional valve | |
| 2. |
Which of the following statements is true for cascade method which is used to draw a pneumatic circuit? |
| A. | signal processing valves are connected in parallel |
| B. | when the number of signal processing valves are greater than 4, the signals are strong |
| C. | cascade method does not consider the cost factor |
| D. | all of the above |
| Answer» D. all of the above | |
| 3. |
Which of the following statements is true for standard hydraulic cylinder and a telescopic cylinder? |
| A. | telescopic and standard cylinders give same stroke length |
| B. | telescopic cylinders give lesser stroke length than standard cylinder |
| C. | telescopic cylinders give greater stroke length than standard cylinder |
| D. | none of the above |
| Answer» D. none of the above | |
| 4. |
Which of the following statements is true, for two pumps used in circuit when initially fast operation is performed to reach a job and feeding operation is done at a slow speed? |
| A. | initially to reach a job, a tool must be connected to a pump of high discharge and low pressure |
| B. | initially to reach a job, a tool must be connected to a pump of low discharge and high pressure |
| C. | for feeding operation low discharge low pressure pump is required |
| D. | none of the above |
| Answer» B. initially to reach a job, a tool must be connected to a pump of low discharge and high pressure | |
| 5. |
Which of the following statements is/are true according to Bernoulli's principle? 1. If a system has constant flow rate, change in cross-section area of the pipe affects the total energy of system 2. The change in cross-section has no effect on the total energy of the system and is constant if it has varying flow rate 3. A system has constant total energy, if flow rate is constant and change in cross-section has no effect on total energy |
| A. | Statement 1 |
| B. | Statement 2 |
| C. | Statement 3 |
| D. | all of the above |
| Answer» D. all of the above | |
| 6. |
Which of the following systems generate more energy when used in industrial applications? |
| A. | hydraulic systems |
| B. | pneumatic systems |
| C. | both systems generate same energy |
| D. | cannot say |
| Answer» B. pneumatic systems | |
| 7. |
Which of these actions does a hydraulic cylinder perform? |
| A. | pushing |
| B. | lifting |
| C. | both a. and b. |
| D. | none of the above |
| Answer» D. none of the above | |
| 8. |
Which place in hydraulic turbine is most susceptible for cavitation __________________? |
| A. | inlet of draft rube |
| B. | blade inlet |
| C. | guide blade |
| D. | penstock |
| E. | draft tube exit |
| Answer» B. blade inlet | |
| 9. |
Which property decides the behavior of fluid when mixed with water? |
| A. | pour point |
| B. | demulsibility |
| C. | viscosity |
| D. | oxidation |
| Answer» C. viscosity | |
| 10. |
Which stage in two stage direction control valve is solenoid operated? |
| A. | main stage direction control valve |
| B. | pilot stage direction control valve |
| C. | both stages in two stage direction control are solenoid operated |
| D. | none of the above |
| Answer» C. both stages in two stage direction control are solenoid operated | |
| 11. |
Which system uses kinetic energy to transmit power? |
| A. | hydrostatic system |
| B. | hydrodynamic system |
| C. | pneumatic system |
| D. | none of the above |
| Answer» C. pneumatic system | |
| 12. |
Which type of compressor requires a reservoir for compressed air and why? |
| A. | rotary compressor to avoid pulsating effect |
| B. | reciprocating compressor to avoid pulsating effect |
| C. | both rotary and reciprocating compressors to avoid pulsating effect |
| D. | none of the above |
| Answer» C. both rotary and reciprocating compressors to avoid pulsating effect | |
| 13. |
Which type of displacement is observed in gear pumps? |
| A. | only variable displacement |
| B. | only fixed displacement |
| C. | both fixed and variable displacement |
| D. | none of the above |
| Answer» C. both fixed and variable displacement | |
| 14. |
Which type of hydraulic cylinder has one piston connected to piston rod extended on both the sides of the cylinder? |
| A. | telescopic cylinder |
| B. | tandem cylinder |
| C. | both a. and b. |
| D. | none of the above |
| Answer» C. both a. and b. | |
| 15. |
Which type of motion is transmitted by hydraulic actuators? |
| A. | linear motion |
| B. | rotary motion |
| C. | both a. and b. |
| D. | none of the above |
| Answer» D. none of the above | |
| 16. |
Which type of pump is used for lifting water from the ground surface to the top of the building? |
| A. | centrifugal pump |
| B. | turbine pump |
| C. | submersible pump |
| D. | all of the above |
| Answer» E. | |
| 17. |
Which type of solenoid has more chances of coil failure? |
| A. | AC solenoid |
| B. | DC solenoid |
| C. | both AC and DC solenoids |
| D. | none of the above |
| Answer» B. DC solenoid | |
| 18. |
Which valve gets activated only in one direction that is forward or backward movement of the piston rod? |
| A. | roller lever valve |
| B. | idle roller lever valve |
| C. | both a. and b. |
| D. | none of the above |
| Answer» C. both a. and b. | |
| 19. |
Which valve is used to block the accumulator from the system for the purpose of safety? |
| A. | pilot valve |
| B. | needle valve |
| C. | detent valve |
| D. | all of the above |
| Answer» C. detent valve | |
| 20. |
Which valve is also known as memory valve? |
| A. | single pilot signal valve |
| B. | double pilot signal valve |
| C. | roller lever valve |
| D. | logic valve |
| Answer» C. roller lever valve | |
| 21. |
While operating a positive displacement pump, |
| A. | the shut-off valve should be closed on delivery side |
| B. | the shut-off valve should be closed on suction side |
| C. | the shut-off valve should be opened on delivery side |
| D. | none of the above |
| Answer» D. none of the above | |
| 22. |
Why according to Bernoulli's principle, change in cross-section area of the pipe has no effect on total energy of the system? |
| A. | when area of pipe increases upstream, kinetic energy of fluid decreases as velocity of fluid increases and potential energy increases |
| B. | when area of pipe increases upstream, kinetic energy of fluid decreases as velocity of fluid decreases and potential energy increases |
| C. | when area of pipe increases upstream, kinetic energy of the fluid increases as velocity of fluid decreases and potential energy decreases |
| D. | when area of pipe increases upstream, kinetic energy of fluid increases as velocity of fluid increases and potential energy decreases |
| Answer» C. when area of pipe increases upstream, kinetic energy of the fluid increases as velocity of fluid decreases and potential energy decreases | |
| 23. |
Why are bleed off circuits used? |
| A. | bleed off circuit is used to restrict the flow of fluid into the hydraulic cylinder |
| B. | bleed off circuit is used to restrict the flow of fluid out of the hydraulic cylinder |
| C. | bleed off circuits are used to reduce the speed of actuator |
| D. | all of the above |
| Answer» D. all of the above | |
| 24. |
Why are electromechanical relays more popular than solid state relays? |
| A. | they are reliable |
| B. | less costly |
| C. | both a. and b. |
| D. | none of the above |
| Answer» D. none of the above | |
| 25. |
Why are hydraulic cylinders cushioned? |
| A. | cushioning decelerates the piston of a cylinder |
| B. | stress and vibrations can be reduced |
| C. | both a. and b. |
| D. | none of the above |
| Answer» D. none of the above | |
| 26. |
Why is fluid power preferred in mobile vehicles? 1. Power can be transmitted without any delay 2. When overloaded, fluid power systems stop without damaging the components 3. Speed variation cannot be achieved 4. Fluid is non-compressible |
| A. | 1 and 4 |
| B. | 2, 3 and 4 |
| C. | 1, 2 and 4 |
| D. | 1 and 2 |
| Answer» D. 1 and 2 | |
| 27. |
Why is the pilot operated check valve used in clamping operation? |
| A. | to reduce leakage in spool valve |
| B. | to avoid decrease in pressure during clamping |
| C. | both a. and b. |
| D. | none of the above |
| Answer» D. none of the above | |
| 28. |
Which of the following statements is false for vane pumps? |
| A. | wear in contact surfaces occurs due to continuous contact between vane tips and the cam ring |
| B. | different sizes of cartridge kits can be replaced in same vane pump |
| C. | elliptical cam ring is replaced by round cam ring to reduce unbalanced forces |
| D. | none of the above |
| Answer» D. none of the above | |
| 29. |
Which of the following statements are true for throttle valve? 1. Reverse flow of fluid is not possible 2. Input pressure for a throttle valve is more than output pressure 3. The actuator speed can be reduced by a throttle valve 4. Correct flow control valve for a particular application can be selected on the basis of pressure drop specified |
| A. | 1, 2 and 3 |
| B. | 1, 3 and 4 |
| C. | 2, 3 and 4 |
| D. | all of the above |
| Answer» D. all of the above | |
| 30. |
Which of the following statements are true for accumulator used in hydraulic systems? 1. Accumulator stores fluid with pressure 2. Accumulator stores fluid without any pressure 3. Accumulator stores compressible liquid 4. Spring is used as an external source to keep the fluid under hydraulic pressure |
| A. | 1, 3 and 4 |
| B. | 2 and 3 |
| C. | 1 and 4 |
| D. | 2, 3 and 4 |
| Answer» D. 2, 3 and 4 | |
| 31. |
Which of the following statements are true? 1. the length of two stage telescopic cylinder is more than a standard cylinder 2. the length of two stage telescopic cylinder is less than a standard cylinder 3. telescopic cylinder is single acting 4. telescopic cylinder is double acting |
| A. | 1 and 3 |
| B. | 2 and 3 |
| C. | 2, 3 and 4 |
| D. | 1, 3 and 4 |
| Answer» D. 1, 3 and 4 | |
| 32. |
Which of the following statements are true? 1. piston pumps are self priming 2. piston pumps require high maintenance 3. piston pumps have low cost of production 4. piston pumps have low volumetric efficiency |
| A. | 1 and 2 |
| B. | 3 and 4 |
| C. | 1 and 3 |
| D. | all of the above |
| Answer» B. 3 and 4 | |
| 33. |
Which of the following statements are true? 1. Low viscosity fluids have higher leakage 2. High viscosity fluids have high pressure drop 3. Low viscosity fluids consume more power 4. Low viscosity leads to wear of components |
| A. | 1 and 2 |
| B. | 1, 2 and 3 |
| C. | 1, 2 and 4 |
| D. | 2, 3 and 4 |
| Answer» D. 2, 3 and 4 | |
| 34. |
Which of the following statements are true? 1. Bell housing connects motor and pump 2. Centrifugal pump is a non-positive displacement pump 3. Centrifugal pumps allow the back flow of fluid from delivery side to the suction side of the pump 4. The function of vent plug used in a reservoir is to flush out oil |
| A. | 1, 2 and 4 |
| B. | 2, 3 and 4 |
| C. | 2 and 3 |
| D. | all of the above |
| Answer» C. 2 and 3 | |
| 35. |
Which of the following statements are false? 1. Pressure is resistance to flow 2. Friction creates pressure 3. Load cannot create pressure on the system 4. The pressure developed decreases if load offers more resistance |
| A. | 1, 2 and 4 |
| B. | 1 and 2 |
| C. | 3 and 4 |
| D. | none of the above |
| Answer» D. none of the above | |
| 36. |
Which of the following reasons make water unsuitable to use as a fluid in hydraulic systems? 1. Poor lubrication 2. High viscosity 3. More leakage 4. Quickly evaporates |
| A. | 1 and 3 |
| B. | 2 and 4 |
| C. | 1, 3 and 4 |
| D. | all of the above |
| Answer» D. all of the above | |
| 37. |
Which of the following pumps saves more power? |
| A. | single pump |
| B. | double pump |
| C. | single and double pump use same amount of power |
| D. | none of the above |
| Answer» C. single and double pump use same amount of power | |
| 38. |
Which of the following notations is used to represent a regulator unit? |
| A. | 3.0 |
| B. | 0.3 |
| C. | 3 |
| D. | none of the above |
| Answer» C. 3 | |
| 39. |
Which of the following logic valve is known as shuttle valve? |
| A. | OR gate |
| B. | AND gate |
| C. | NOR gate |
| D. | NAND |
| Answer» B. AND gate | |
| 40. |
Which of the following is used to sense the initial and final positions of a piston rod? |
| A. | lever operated direction control valve |
| B. | limit switch |
| C. | roller lever valve |
| D. | all of the above |
| Answer» E. | |
| 41. |
Which of the following is used for mounting purpose in hydraulic cylinders? |
| A. | Female clevis |
| B. | Circular flange |
| C. | Trunnion |
| D. | all of the above |
| Answer» E. | |
| 42. |
Which of the following is used as an accessory in hydraulic power unit? |
| A. | pumps |
| B. | valves |
| C. | motor |
| D. | reservoir |
| Answer» E. | |
| 43. |
Which of the following is used an output device on a ladder diagram? |
| A. | proximity sensor |
| B. | detent switch |
| C. | relay |
| D. | all of the above |
| Answer» D. all of the above | |
| 44. |
Which of the following is used as a component in hydraulic power unit? |
| A. | pressure gauge |
| B. | filler gauge |
| C. | valve |
| D. | reservoir |
| Answer» D. reservoir | |
| 45. |
Which of the following is applicable for bleed off circuits? |
| A. | bleed off circuits develop heat in the system |
| B. | bleed off circuits are used for resistive loads |
| C. | bleed off circuits are used for runaway loads |
| D. | all of the above |
| Answer» C. bleed off circuits are used for runaway loads | |
| 46. |
Which of the following is an element of time delay valve? |
| A. | flow control valve |
| B. | direction control valve |
| C. | both a. and b. |
| D. | none of the above |
| Answer» D. none of the above | |
| 47. |
Which of the following is a type of low-torque high-speed motor? |
| A. | radial piston motors |
| B. | axial piston motors |
| C. | bent axis motor |
| D. | gear motor |
| Answer» E. | |
| 48. |
Which of the following is a type of cushioning in hydraulic cylinders? |
| A. | trunnion cushioning |
| B. | adjustable cushioning |
| C. | clevis cushioning |
| D. | none of the above |
| Answer» C. clevis cushioning | |
| 49. |
Which of the following is a hydrodynamic pump? |
| A. | vane pump |
| B. | centrifugal pump |
| C. | gear pump |
| D. | piston pump |
| Answer» C. gear pump | |
| 50. |
Which of the following is a hydraulic cylinder based on construction? |
| A. | single acting cylinder |
| B. | double acting cylinder |
| C. | welded design cylinder |
| D. | all of the above |
| Answer» D. all of the above | |