Q.1
Consider a simple mass spring friction system as given in the figure KK2 are spring constants f-friction, M-Mass, F-Force, x-Displacement. The transfer function X(s)/F(s) of the given system will be :
Questioncontrol-systems-questions-answers1.jpg
  • 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)
Q.2
The output of an first order hold between two consecutive sampling instants is:
  • a) Constant
  • b) Quadratic Function
  • c) Ramp Function
  • d) Exponential Function
Q.3
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
Q.4
A tachometer is added to servomechanism because:
  • a) It is easily adjustable
  • b) It can adjust damping
  • c) It reduces steady state error
  • d) It converts velocity of the shaft to a proportional Dc voltage
Q.5
A synchro Transmitter is used with control transformer for:
  • a) Feedback
  • b) Amplification
  • c) Error detection
  • d) Remote sensing
Q.6
The below figure represents:
Questioncontrol-systems-questions-answers6.jpg
  • a) Lead network
  • b) Lag network
  • c) PI controller
  • d) PD controller
Q.7
Backlash in a stable control system may cause:
  • a) Under damping
  • b) Over damping
  • c) High level oscillations
  • d) Low level oscillations
Q.8
Tachometer feedback in a D.C. position control system enhances stability?
  • a) True
  • b) False
Q.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
Q.10
Gear train in the motor is used to reduce the gear ratio?
  • a) True
  • b) False
Q.11
Assertion (A): Servomotors have heavier rotors and lower R/X ratio as compared to ordinary motors of similar ratings.
  • 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
Q.12
Assertion (A): DC servomotors are more commonly used in armature controlled mode than field controlled mode.
  • 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
Q.13
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
Q.14
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
Q.15
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
Q.16
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
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