This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Controller Components – I”.
1. Low power transducers called sensors prefer:
a) Linear relationship between controlled variable and output variable
b) Non-functional relationship between controlled variable and output variable
c) Non-linear relationship between controlled variable and output variable
d) Not related with each other
View Answer
Explanation: Sensors are different from transducers as in transducers the energy is converted from one form to another while in sensors only the energy is sensed not converted and it is possible to get the accurate results in less time.
2. The chief advantage offered by the electronics is:
a) Differencing and stable amplification by Op-Amp
b) Stable amplification of power level by use of power transistor and SCR’s
c) Differencing and stable amplification of power level by Op-Amp
d) No amplification with the Op-Amp
View Answer
Explanation: Advantage of electronics is that every type of energy is converted into measurable and storage energy and electronically differencing to get the error signal and its amplifier.
3. Which of the motions in actuators are preferred:
a) Translator
b) Rotary
c) Stationary
d) Non-Stationary
View Answer
Explanation: An actuator in a control systems perform variety of task in hydraulic, pneumatic and electrical system but majorly they are all controlling rotary motions.
4. 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
View Answer
Explanation: Electric actuators are the devices that are used to convert non measurable form of energy into measurable and are used in high torque applications due to linear speed torque characteristics but not used in low speed where hydraulic actuators are still used.
5. Low power DC and AC motors are also known as _________
a) Servomotors
b) Tachogenerators
c) A.C. generators
d) D.C. generators
View Answer
Explanation: Electric actuators are of two kinds’ ac and dc motors and with low power rating they are called RC(Radio Control) servomotors.
6. The torque developed by the motor when stationary with the full applied voltage__________
a) Stalled torque
b) Torque
c) Force
d) Couple
View Answer
Explanation: Stalled torque is the torque produced by a mechanical device whose output rotational speed is zero. It may also mean the torque load that causes the output rotational speed of a device to become zero when full voltage is applied.
7. High torque/inertia ratio means:
a) Stalled torque
b) Stalled inertia
c) Stalled toque/inertia ratio
d) Lower motor time constant
View Answer
Explanation: High torque/inertia ratio means the ratio of torque to the inertia should be high.For higher torque the inertia must be very low and this indicates lower time constant as it leads to dynamic response.
8. Electric actuators for stepped motion are known as stepper motor.
a) True
b) False
View Answer
Explanation: Stepper motors are the motors in which the motion generated is in the form of steps with respect to the time and works on the same principle as electric actuators but with stepped motion.
9. DC motors can be modeled as:
a) Armature controlled
b) Field Controlled
c) Both a and b
d) None of the mentioned
View Answer
Explanation: DC motors are the motors that work on the direct current and commutators. Those are replaced by slip rings and can be classified based on the construction as armature controlled or field controlled.
10. 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
View Answer
Explanation: Pneumatic actuators are the devices that convert the motion of air into measurable form of the energy and can also be used in low speed applications but they suffer leakages and inherent in accuracies.
11. DC motors are constructed using:
a) Permanent Magnet
b) Electromagnet
c) Magnets are not used
d) Permanent Magnet and Electromagnet
View Answer
Explanation: For construction of a dc motor , it is essential to establish a magnetic field. The magnetic field is established by using a magnet. You can use different types of magnets – it may be an electromagnet or it can be a permanent magnet.
12. Permanent magnets used for DC motors because of:
a) High residual flux density
b) High coercivity
c) High residual flux density and High coercivity
d) Retentivity
View Answer
Explanation: Permanent magnets are hard magnets with the area of B-H curve more and they are less used at core of the magnet and are used for DC servomotors as they have high residual flux density and high coercivity.
Sanfoundry Global Education & Learning Series – Control Systems.
To practice all areas of Control Systems, here is complete set of 1000+ Multiple Choice Questions and Answers.
- Check Control System Books
- Apply for Electronics & Communication Engineering Internship
- Check Electrical Engineering Books
- Apply for Electrical Engineering Internship
- Practice Electronics & Communication Engineering MCQs
