# Differential Equations of Physical Systems and Dynamics of Robotic Mechanisms MCQ’s

This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Differential Equations of Physical Systems and Dynamics of Robotic Mechanisms”.

1. The output of an first order hold between two consecutive sampling instants is:
a) Constant
c) Ramp Function
d) Exponential Function

2. Which of the following is an example of an open loop system?
a) Household Refrigerator
b) Respiratory system of an animal
c) Stabilization of air pressure entering into the mask
d) Execution of program by computer

3. Consider a simple mass spring friction system as given in the figure K1, K2 are spring constants f-friction, M-Mass, F-Force, x-Displacement. The transfer function X(s)/F(s) of the given system will be :

a) 1/(Ms2+fs+K1.K2)
b) 1/(Ms2+fs+K1+K2)
c) 1/(Ms2+fs+K1.K2/K1+K2)
d) K2/(Ms2+fs+K1)

4. A tachometer is added to servomechanism because:
c) It reduces steady state error
d) It converts velocity of the shaft to a proportional Dc voltage

5. The below figure represents:

b) Lag network
c) PI controller
d) PD controller

6. Tachometer feedback in a D.C. position control system enhances stability?
a) True
b) False

7. A synchro Transmitter is used with control transformer for:
a) Feedback
b) Amplification
c) Error detection
d) Remote sensing

8. Backlash in a stable control system may cause:
a) Under damping
b) Over damping
c) High level oscillations
d) Low level oscillations

9. For a tachometer, if a(t) is the rotor displacement, e(t) is the output voltage and K is the tachometer constant, then the transfer function is given by:
a) Ks2
b) K/s
c) Ks
d) K

10. Assertion (A): Servomotors have heavier rotors and lower R/X ratio as compared to ordinary motors of similar ratings.
Reason (R): Servomotor should have smaller electrical and mechanical time constants for faster response.
a) Both A and R are true and R is the 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

11. In case of DC servomotor, the back emf is equivalent to an “electric friction” which tends to:
a) Slowly decrease the stability of the system
b) Improve stability of the system
c) Very rapidly decrease the stability of the system
d) Have no effect of stability

12. Gear train in the motor is used to reduce the gear ratio?
a) True
b) False

13. An object stationary or moving in a uniform motion w.r.t A will appear to be traveling in a straight path w.r.t B. This apparent path is attributed to Coriolis acceleration.
a) True
b) False

14. Assertion (A): DC servomotors are more commonly used in armature controlled mode than field controlled mode.
Reason (R): Armature controlled Dc motors have higher starting torque than fiels controlled motors.
a) Both A and R are true and R is the 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

15. The lagrangian is defined as:
a. Sum of kinetic energy and hydraulic energy
b. Mechanical energy
c. Difference of kinetic and potential energy
d. None of these

16. A gantry robot consists of a manipulator mounted on an overhead system that allows movement only in ________ plane.
a) Horizontal
b) Inclined
c) Vertical
d) None of the mentioned