162. In a control system, damping is proportional to

A. gain

B.impedence

C.

D.

163. Knowledge of transfer function of a system is necessary for the calculation of

A. the time constant

B. the output for a given input

C. the steady state gain

D. the order of the system

164. A system function V (s)/I (s) has a pole at s = ?2 and a zero at s = ?1. For sinusoidal current excitation, the voltage response

A. is zero

B. leads the current

C. lags behinds the current

D. is in phase with the current

165. The steady state error of a control system may be minimized by

A. increasing the inertia of the system

B. decreasing the inertia of the system

C. decreasing the torque of servomotor

D. increasing the damping of the system

166. The first derivative output when feedback negatively will

A. decrease the damping of the system

B. increase the damping of the system

C. decrease the velocity?lag error

D. decrease the steady state error

167. In control system, the second derivative input signal adjusts

A. the time constant of the system

B. the damping of the system

C. the time constant and suppresses oscillations

D. none of these

168. In a root locus plot, increase in k will

A. decrease the damping ratio

B. increase the damping ratio

C. not alter the damping ratio

D. may increase or decrease the damping ratio

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