190.  The device which is mostly used to provide damping servomechanism is
A. servomotor
B. technometer
C. amplidyne
D. none of these

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191.  Which of the following device is based on the principle of conservation momentum?
A. synchros
B. gyroscope
C. hydraulic filter
D. none of these

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192.  To keep the basic form of the transfer function of a control system unaltered but to change its time constant and gain we must use
A. unity feedback
B. resistance feedback
C. tachometer feedback
D. none of these

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193.  In pneumatic control system, the electrical resistance is analogous to
A. volume of air
B. restriction of flow
C. filled helium tube
D. none of these

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194.  In pneumatic control system, compensation is provided by
A. bimetal strip
B. extension tube
C. restriction-volume combination
D. none of these

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195.  In pneumatic control system, the electrical capacitance is analogous to
A. volume of air
B. restriction of flow
C. filled helium tube
D. none of these

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196.  In pen umatic control system, the medium is
A. air
B. liquid
C. dil
D. hydrogen

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