[amp_mcq option1=”decrease” option2=”increase” option3=”be unaffected” option4=”any of the above” correct=”option2″]
Electrical control systems
42. In order to increase the damping of a badly underdamped system which of following compensators may be used ?
[amp_mcq option1=”Phase-lead” option2=”Phase-lag” option3=”Both (A) and (B)” option4=”Either (A) and (B) E. None of the above” correct=”option3″]
43. In force-voltage analogy, velocity is analogous to
[amp_mcq option1=”current” option2=”charge” option3=”inductance” option4=”capacitance” correct=”option1″]
Detailed SolutionIn force-voltage analogy, velocity is analogous to
44. In pneumatic control systems the control valve used as final control element converts
[amp_mcq option1=”Pressure signal to electric signal” option2=”Pressure signal to position change” option3=”Electric signal to pressure signal” option4=”Position change to pressure signal” correct=”option2″]
45. Is the reference input minus the primary feedback.
[amp_mcq option1=”Manipulated variable” option2=”Zero sequence” option3=”Actuating signal” option4=”Primary feedback” correct=”option1″]
Detailed SolutionIs the reference input minus the primary feedback.
46. Zero initial condition for a system means
[amp_mcq option1=”input reference signal is zero” option2=”zero stored energy” option3=”ne initial movement of moving parts” option4=”system is at rest and no energy is stored in any of its components” correct=”option4″]
47. A control system in which the control action is somehow dependent on the output is known as
[amp_mcq option1=”Closed loop system” option2=”Semiclosed loop system” option3=”Open system” option4=”None of the above” correct=”option1″]
48. has tendency to oscillate.
[amp_mcq option1=”Open loop system” option2=”Closed loop system” option3=”Both (A) and (B)” option4=”Neither (A) nor (B)” correct=”option3″]
49. A signal other than the reference input that tends to affect the value of controlled variable is known as
[amp_mcq option1=”Disturbance” option2=”Command” option3=”Control element” option4=”Reference input” correct=”option1″]
50. Which of the following is an open loop control system ?
[amp_mcq option1=”Field controlled D.C. motor” option2=”Ward leonard control” option3=”motor B. Ward leonard control C. Metadyne” option4=”Stroboscope” correct=”option1″]
Detailed SolutionWhich of the following is an open loop control system ?