Controller Components – II MCQ’s

Control Systems Electronics & Communication Engineering

This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Controller Components – II”.

1. 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

2. A much lower inertia in Surface wound armature type is obtained by placing the winding on a non-magnetic cylinder which rotates in annular space between permanent magnet stator and stationary rotor.
a) True
b) False

3. 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

4. Lower inertia is obtained due to much larger gap and hence stronger magnets are used for this purpose.
a) True
b) False

5. PMDC device is commonly employed for:
a) Speed feedback in speed control system
b) Internal velocity feedback loop of a position control system
c) This device is used in both speed feedback and internal velocity feedback control
d) None of the mentioned

6. 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

7. PMDC when coupled to a rotating shaft would generate a voltage proportional to speed and thus would serve as____________
a) Tachometer
b) Servomotor
c) D.C. motor
d) A.C. motor

8. Commutation process of a DC motor can be accomplished by solid devices (transistors and SCR’s).
a) True
b) False

9. 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

10. 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

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