Control Systems - Electronics Engineering Test Questions

Control Systems - Electronics Engineering test questions

(1) Consider reciprocal of capacitance and torsional spring stiffness as analogous quantities. The system is considered as

(A) Torque - voltage
(B) Torque - current
(C) Force - voltage
(D) Force - current

ANSWER: Torque - voltage

(2) Under mechanical rotational system and electrical system the quantities that are not analogous are

(A) Angular velocity and current
(B) Angular displacement and charge
(C) Viscous friction and coefficient resistance
(D) Moment of inertia and conductance

ANSWER: Moment of inertia and conductance\

(3) Analogies of non-electrical systems are preferred to draw over electrical systems because

(A) Electrical quantities can be easily measured 
(B) Electrical systems are more easily amenable to experimental study 
(C) Electrons move faster
(D) All of the above

ANSWER: Electrical systems are more easily amenable to experimental study

(4) Consider the Laplace transform F(s) = 4s / s^³ + 2s^² + 9s + 6 of the function f (t). The initial value of the function is

(A) 0
(B) 1
(C) 0.5
(D) None of the above

ANSWER: 0

(5) Under analogy of electrical and thermal systems, the resistance under thermal quantities is expressed in terms of

(A) °C 
(B) °C / (joule /min)
(C) °C / joule 
(D) Min / joule °C 

ANSWER: °C / (joule /min)

(6) The method of Laplace transform is applicable to equations containing

(A) Integral terms only
(B) Scalar terms only
(C) Differential terms only
(D) None of the above

ANSWER: None of the above

(7) The characteristic equation s^³ + 4 s^² + 8s + 12 represents a

(A) Marginally stable system
(B) Unstable system
(C) Stable system
(D) Marginally unstable system

(8) The number of roots with positive real parts for the characteristic equation 2s^³ + 4 s^² + 4s + 12 = 0 is

(A) One
(B) Two
(C) Three
(D) None

ANSWER: Two

(9) Which one of the following roots of characteristic equations represents stable system?

(A) 2, -1, -3
(B) -1, +1
(C) (-2 + 3j), (-2 - 3j), -2
(D) -j, j, -1, 1

ANSWER: (-2 + 3j), (-2 - 3j), -2

For questions 10 to 13 refer to the data given below:

Consider second order system 2 d^² y / dt^² + 4 dy / dt +8y = 8x

(10) The damping ratio is

(A) 0.50
(B) 0.25
(C) 0.6
(D) 0.8

ANSWER: 0.50

Thank You