MCQOPTIONS
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MCQOPTIONS
This section includes 25 Mcqs, each offering curated multiple-choice questions to sharpen your Control Systems knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When comparing first cost of hydraulic systems to pneumatic systems, generally they are: |
| A. | More expensive to purchase |
| B. | Less expensive to purchase |
| C. | Cost is same |
| D. | Cost is not required |
| Answer» C. Cost is same | |
| 2. |
DC motors are constructed using: |
| A. | Permanent Magnet |
| B. | Electromagnet. |
| C. | Magnets are not used |
| D. | Plastics |
| Answer» B. Electromagnet. | |
| 3. |
Assertion (A): Pneumatic actuators are not as messy as hydraulic ones.Reason (R): Pneumatic suffer from leakages and inherent inaccuracies. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» C. A is true but R is false | |
| 4. |
The use of feedback element in the feedback loop is: |
| A. | It converts the output variable 'c' to another suitable feedback variable 'b' to compare with the input command signal. |
| B. | It is the actuating element |
| C. | To increase the stability |
| D. | None of the mentioned |
| Answer» B. It is the actuating element | |
| 5. |
A one-way valve that lets air into the reservoir of a compressor, but doesn't let it out, is a |
| A. | Check valve |
| B. | Receiver valve |
| C. | Control valve |
| D. | Three way valve |
| Answer» B. Receiver valve | |
| 6. |
Different type of construction in permanent type DC magnet are : |
| A. | Slotted armature type |
| B. | Surface wound armature type |
| C. | Surface wound rotating armature, stationary wound type. |
| D. | All of the mentioned |
| Answer» E. | |
| 7. |
The ____________________ converts the compressed air energy into mechanical energy in the form of linear movement in one direction only. |
| A. | Piston cylinders |
| B. | Double acting cylinders |
| C. | Single acting cylinders |
| D. | Hydraulic pumps |
| Answer» D. Hydraulic pumps | |
| 8. |
The major components of a controller are: |
| A. | Control element |
| B. | Error detector and control element |
| C. | Feedback element |
| D. | Error detector and feedback element |
| Answer» C. Feedback element | |
| 9. |
Commutation process of a DC motor can be accomplished by solid devices (transistors and SCR's). |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
When the piston area of the cylinder is connected to the atmosphere, the piston of the single-acting cylinder is pressed by the spring to the ________________ |
| A. | Cylinder center |
| B. | Cylinder down |
| C. | Cylinder bottom |
| D. | Cylinder upper |
| Answer» B. Cylinder down | |
| 11. |
When comparing operating cost of hydraulic systems to pneumatic systems, generally they are. |
| A. | More expensive to operate |
| B. | Less expensive to operate |
| C. | Cost is same to operate |
| D. | Cost is not required |
| Answer» C. Cost is same to operate | |
| 12. |
A stepper motor may be considered as a ____________ converter. |
| A. | Dc to dc |
| B. | Ac to ac |
| C. | Dc to ac |
| D. | Digital-to-analogue |
| Answer» E. | |
| 13. |
If a hybrid stepper motor has a rotor pitch of 36º and a step angle of 9º, the number of its phases must be |
| A. | 4 |
| B. | 2 |
| C. | 3 |
| D. | 6 |
| Answer» B. 2 | |
| 14. |
A _____________ restricts air flow. |
| A. | Throttle valve |
| B. | Shuttle valve |
| C. | Directional control valve |
| D. | Single acting cylinder |
| Answer» B. Shuttle valve | |
| 15. |
Assertion (A): DC servomotors have practically taken over from AC servomotors in most control application.Reason (R): Low brush commutator friction and still higher torque/inertia have been achieved in DC servomotors. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 16. |
DC motors are constructed using Permanent Magnet resulting in: |
| A. | Higher torque/inertia ratio |
| B. | Higher operating frequency |
| C. | No filed losses |
| D. | All of the mentioned |
| Answer» E. | |
| 17. |
What is the step angle of a permanent-magnet stepper motor having 8 stator poles and 4 rotor poles? |
| A. | 60º |
| B. | 45º |
| C. | 30º |
| D. | 15º |
| Answer» C. 30º | |
| 18. |
Electric actuators for stepped motion are known as stepper motor. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 19. |
Assertion (A): Slotted armature type in this armature is placed in slotted armature with DC windings placed inside the slots.Reason (R): The construction is highly reliable and rugged but has high torque. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» C. A is true but R is false | |
| 20. |
Assertion (A): Electric actuators are used control system for high torque applications.Reason (R): Due to linear speed-Torque characteristics. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 21. |
Permanent magnets used for DC motors because of: |
| A. | High residual flux density |
| B. | High coercivity |
| C. | Both a and b |
| D. | Retentivity |
| Answer» D. Retentivity | |
| 22. |
Speed of a permanent magnet DC motor: |
| A. | It is directly proportional to the armature voltage at a given load torque |
| B. | The speed torque characteristics are more flat than in a wound field motor |
| C. | It depends upon armature voltage and are more flat than in a wound field motor |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 23. |
In electrical-pneumatic system analogy the current is considered analogous to |
| A. | Velocity |
| B. | Pressure |
| C. | Air flow |
| D. | Air flow rate |
| Answer» E. | |
| 24. |
The most common hydraulic fluid is: |
| A. | Mineral oil |
| B. | Synthetic fluid |
| C. | Water |
| D. | Gel |
| Answer» D. Gel | |
| 25. |
DC motors can be modeled as: |
| A. | Armature controlled |
| B. | Field Controlled |
| C. | Both a and b |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |