169.  In a root locus plot, increase in k will
A. decrease the overshoot of the response
B. increase the overshoot of the response
C. not alter the overshoot of the response
D. none of these

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170.  In a root locus plot, increase in k will
A. decrease the natural frequency
B. increase the natural frequency
C. not alter the natural frequency
D. none of these

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171.  The phase margin of a system specifies
A. relative stability
B. absolute stability
C. frequency response
D. none of these

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172.  When a step function is applied to the input of a system, the output remains below a certain level for all the time. The system is
A. stable
B. unstable
C. not necessarily stable
D. always unstable

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173.  A system has poles at ?1 and ?5 and zeros of 1 and ?2. The system is
A. stable
B. unstable
C. marginally stable
D. highly stable

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174.  Using a conventional servomotor for servo applications, the system becomes unstable because
A. rotor diameter is large
B. rotor resistance is high
C. rotor resistance is low
D. applied voltages are always required to be balanced

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175.  In a series servo motor, which of the following constitutes the drawback?
A. High starting torque needed
B. Poor speed regulation
C. Large current drawn
D. All of these

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