Control Systems - Study Mode
[#221] The pole-zero plot is shown here when the DC gain is equal to 20. The system transfer function is . . . . . . . .
Correct Answer
(C) $$frac{{33.33left( {s + 3}
ight)}}{{left( {s + 1}
ight)left( {{s^2} + 4s + 5}
ight)}}$$
[#222] In the case of a second order system described by the differential equation, $$frac{{J{d^2}{ heta _0}}}{{d{t^2}}} + Ffrac{{d{ heta _0}}}{{dt}} + k{ heta _0} = k{ heta _i}$$ (where θ 1 and θ 0 are input and output shaft angles), the natural frequency is given by:
Correct Answer
(A) $$sqrt {frac{K}{J}} $$
[#223] The magnitude and phase relationship between the sinusoidal input and the steady-state output of a system is called as:
Correct Answer
(D) Frequency response
[#224] Consider the following for a variable reluctance stepper motor used in system: 1. The stator torque acting on the rotor is a function of angular misalignment between stator and rotor teeth. 2. There are two positions of zero torque: $$ heta = {0^ circ },,frac{{{{180}^ circ }}}{{ ext{T}}}$$ xa0 (T = number of rotor teeth) 3. Both the torque zero positions are stable. 4. As the stator is excited, the rotor is pulled into the nearest minimum reluctance position. Of these statements
Correct Answer
(C) 1, 2 and 4 are correct
[#225] Consider the following statements: The Gain margin and Phase margin of an unstable system may respectively be: 1. Positive, negative 2. Negative, positive 3. Negative, negative Which of the above statements is/are correct?
Correct Answer
(D) 1, 2 and 3