Question 21 : " Velocity error constant of a system is measured when the input to the system is unit _______ function."
1. " Parabolic"
2. " Ramp"
3. " Impulse"
4. " Step"
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Question 22 : " If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is :"
1. " Not necessarily stable"
2. " Stable"
3. " Unstable"
4. " Always unstable"
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Question 23 : " In case of type-1 system steady state acceleration is :"
1. " Unity"
2. " Infinity"
3. " Zero"
4. " 10"
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Question 24 : " For output regulator problem in performance index the parameter which is set to zero:"
1. " Input vector"
2. " Output vector"
3. " Control vector"
4. " State vector"
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Question 25 : " Performance index can become infinite if:"
1. " One or more state are uncontrollable"
2. " The uncontrollable states are uncontrollable"
3. " The unstable states are reflected in system performance index"
4. " All of the mentioned"
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Question 26 : " The limitation of the transfer function approach are:"
1. " The spectral factorization becomes quite complex"
2. " It is restricted to the systems with all performance index"
3. " Multi input and multi output systems are not obvious"
4. " It is useful for time varying and linear systems"
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Question 27 : " Z-transform is used in:"
1. " Continuous optimal control problem"
2. " Discrete optimal problem"
3. " Control systems"
4. " None of the mentioned"
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Question 28 : " A conditionally stable system exhibits poor stability at :"
1. " Low frequencies"
2. " Reduced values of open loop gain"
3. " Increased values of open loop gain"
4. " High frequencies"
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Question 29 : " The type 1 system has ______ at the origin."
1. " No pole"
2. " Net pole"
3. " Simple pole"
4. " Two poles"
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Question 30 : " If Q is positive semi- definite:"
1. " The optimal closed loop system is asymptotically stable"
2. " The asymptotic stability is not guaranteed"
3. " The system is stable"
4. " The system is unstable"
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