Electrical control systems

41. In closed loop control system, with positive value of feedback gain the overall gain of the system will

decrease
increase
be unaffected
any of the above

Detailed SolutionIn closed loop control system, with positive value of feedback gain the overall gain of the system will

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42. In order to increase the damping of a badly underdamped system which of following compensators may be used ?

Phase-lead
Phase-lag
Both (A) and (B)
Either (A) and (B) E. None of the above

Detailed SolutionIn order to increase the damping of a badly underdamped system which of following compensators may be used ?

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43. In force-voltage analogy, velocity is analogous to

current
charge
inductance
capacitance

Detailed SolutionIn force-voltage analogy, velocity is analogous to

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44. In pneumatic control systems the control valve used as final control element converts

Pressure signal to electric signal
Pressure signal to position change
Electric signal to pressure signal
Position change to pressure signal

Detailed SolutionIn pneumatic control systems the control valve used as final control element converts

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45. Is the reference input minus the primary feedback.

Manipulated variable
Zero sequence
Actuating signal
Primary feedback

Detailed SolutionIs the reference input minus the primary feedback.

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46. Zero initial condition for a system means

input reference signal is zero
zero stored energy
ne initial movement of moving parts
system is at rest and no energy is stored in any of its components

Detailed SolutionZero initial condition for a system means

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47. A control system in which the control action is somehow dependent on the output is known as

Closed loop system
Semiclosed loop system
Open system
None of the above

Detailed SolutionA control system in which the control action is somehow dependent on the output is known as

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48. has tendency to oscillate.

Open loop system
Closed loop system
Both (A) and (B)
Neither (A) nor (B)

Detailed Solutionhas tendency to oscillate.

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49. A signal other than the reference input that tends to affect the value of controlled variable is known as

Disturbance
Command
Control element
Reference input

Detailed SolutionA signal other than the reference input that tends to affect the value of controlled variable is known as

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50. Which of the following is an open loop control system ?

Field controlled D.C. motor
Ward leonard control
motor B. Ward leonard control C. Metadyne
Stroboscope

Detailed SolutionWhich of the following is an open loop control system ?

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