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Control Systems
Control Systems Interview
Quiz 1
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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 :
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:
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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