Drone Systems and Control Nptel Week 4 Answers
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Drone Systems and Control Nptel Week 4 Answers (July-Dec 2025)
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Question 1. Which of the following is an example of an open-loop control system?
a) Cruise control in a car
b) Air conditioner with thermostat
c) Electric toaster
d) Elevator system
Question 2. The primary objective of a control system is to:
a) Maximize energy consumption
b) Eliminate all external disturbances
c) Make the system unstable
d) Achieve desired output with minimum error
Question 3. Which one is not a component of a basic control system?
a) Controller
b) Sensor
c) Actuator
d) Generator
These are Drone Systems and Control Nptel Week 4 Answers
Question 4. A closed-loop system is also known as a:
a) Manual system
b) Automatic system
c) Unstable system
d) Linear system
Question 5. The main disadvantage of an open-loop control system is:
a) Complexity
b) High cost
c) Lack of feedback
d) Low efficiency
Question 6. Feedback in control systems helps in:
a) Making the system slow
b) Increasing steady-state error
c) Improving accuracy and stability
d) Increasing system noise
Question 7. The signal which is compared with the output in a feedback system is called:
a) Error signal
b) Reference input
c) Actuating signal
d) Setpoint
Question 8. Stability of a control system means that the system:
a) Does not respond to inputs
b) Gives infinite output
c) Produces bounded output for a bounded input
d) Has no gain
Question 9. In a quadrotor drone, the altitude control loop primarily regulates:
a) Roll angle
b) Pitch angle
c) Vertical thrust
d) Yaw rate
Question 10. In a quadcopter, forward motion is achieved by:
a) Increasing total thrust uniformly
b) Increasing rear rotor speed and decreasing front rotor speed
c) Increasing left rotor speed and decreasing right rotor speed
d) Varying yaw to change orientation
Question 11. The Laplace transform of a constant a is:
a) as
b) as
c) 1as
d) ae−st
Question 12. What is the Laplace transform of sin(at)?
a) as²+a²
b) s/(s²+a²)
c) 1/(s−a)
d) 1/(s+a)
These are Drone Systems and Control Nptel Week 4 Answers
Question 13. The Laplace transform of e−atf(t) is:
a) F(s+a)
b) F(s−a)
c) ea·sF(s)
d) F(s)−a
Question 14. Which of the following functions has a Laplace transform 1/s²?
a) 1
b) t
c) t²
d) sin(t)
Question 15. The final value theorem is valid only if:
a) All poles of sF(s) lie in the left-half plane
b) F(s) has a pole at origin
c) System is unstable
d) Laplace transform does not exist
Question 16. Which of the following best defines a transfer function of a linear time-invariant system?
a) Ratio of output to input in time domain
b) Ratio of Laplace transform of output to that of input with all initial conditions zero
c) Ratio of input to output in frequency domain
d) Laplace transform of the system’s impulse response
These are Drone Systems and Control Nptel Week 4 Answers
Question 17. A transfer function represents:
a) Time domain behavior
b) Frequency response
c) Input-output relation in s-domain
d) All of the above
Question 18. For a transfer function 10/(s³+6s²+11s+6), the order and type of the system are:
a) Order = 3, Type = 0
b) Order = 2, Type = 1
c) Order = 3, Type = 1
d) Order = 2, Type = 0
Question 19. The poles of a transfer function are the values of s that:
a) Make the numerator zero
b) Make the transfer function zero
c) Make the denominator zero
d) Maximize gain
Question 20. If a system has a pole in the right half of the s-plane, the system is:
a) Stable
b) Marginally stable
c) Unstable
d) Critically damped
These are Drone Systems and Control Nptel Week 4 Answers
