Control Systems

91. Which of the following is the best method for determining the stability and transient response?

1. Root locus
2. Bode plot
3. Nyquist plot
4. None of the above

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92. Which of the following is the definition of proportional band of a controller?

1. The range of air output as measured variable varies from maximum to minimum
2. The range of measured variables from set value
3. The range of measured variables through which the air output changes from maximum to minimum
4. Any of the above

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93. Which of the following is the non-linearity caused by servomotor?

1. Static friction
2. Backlash
3. Saturation
4. None of the above

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94. Which of the following is the output of a thermocouple?

1. Alternating current
2. Direct current
3. A.C. voltage
4. D.C. voltage

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95. Which of the following should be done to make an unstable system stable?

1. The gain of the system should be decreased
2. The gain of the system should be increased
3. The number of poles to the loop transfer function should be increased
4. The number of zeros to the loop transfer function should be increased

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96. Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero?

1. The system is relatively stable
2. The system is highly stable
3. The system is highly oscillatory
4. None of the above

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97. Which of the following statements is correct for any closed loop system?

1. All the co-efficients can have zero value
2. All the co-efficients are always non-zero
3. Only one of the static error co-efficients has a finite non-zero value
4. None of the above

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98. Which of the following statements is not necessarily correct for open control system?

1. Input command is the sole factor responsible for providing the control action
2. Presence of non-linearities causes malfunctioning
3. Less expensive
4. Generally free from problems of non-linearities

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99. With feed back reduces.

1. system stability
2. system gain
3. system stability and gain
4. none of the above

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100. With feedback increases.

1. system stability
2. sensitivity
3. gain
4. effects of disturbing signals

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