152. In Bode diagram (log magnitude plot) of the factor 1/(1 + jωT) in the transfer function the log magnitude for ω << 1/T can be approximated by
153. Assertion (A): The part of root locus on the real axis is not dependent on the poles and zeros which are not on the real axis.Reason (R): Poles and zeros which are not on the real axis occur in conjugate pairs
154. The phase angle of is constant and equal to - 90° for all values of ω
155. For underdamped second order systems the rise time is the time required for the response to rise from
156. The open loop frequency response of a unity feed back system is as under
The gain margin and phase margin respectively are
157. Assertion (A): A large negative feedback is deliberately introduced in an amplifier to make its gain independent of variation in parameters of active device.Reason (R): A large negative value of feedback results in a high value of return difference compared to unity which makes the feedback gain inversely proportional to the feedback factor.
158. Pick out the most effective word from the choices. He ......... his father rather than his mother.?
159. In response to a unit step input the controller output in given figure is for
160. An electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis is
161. If then f(t) =
162. When time constant T in any factor is varied, the shapes of log magnitude and phase angle curves remain the same.
163. Which of the following is not correct for two phase servomotor?
164. Given figure shows the magnitude plot for a system. The steady state error for unit step input is
165. DC servomotors are, generally
166. As the bandwidth increases, the cost of components
167. If Nyquist plot has a encirclement of (-1 + jo) point, the system is stable if
168. A conditionally stable system has
169. For very low frequencies, log magnitude for the given figure is
170. In a pneumatic bellows
171. Assertion (A): If the Laplace transform is , the Laplaces transform of impulse response is given by Reason (R): The Laplace transform for an impulse function is 1.
172. The polar plot of is the negative imaginary axis.
173. Philosopher’s wool is?
174. The number of branches of root locus plot is equal to