Control Systems

51. is not a final control element.

1. Control valve
2. Potentiometer
3. Electropneumatic converter
4. Servomotor

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52. Mass, in force-voltage analogy, is analogous to

1. charge
2. current
3. inductance
4. resistance

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53. On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend?

1. Frequency
2. Loop gain
3. Forward gain
4. All of the above

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54. Phase margin of a system is used to specify which of the following?

1. Frequency response
2. Absolute stability
3. Relative stability
4. Time response

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55. Pressure error can be measured by which of the following?

1. Differential bellows and straingauge
2. Selsyn
3. Strain gauge
4. Strain gauge and potentiometer

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56. Regenerative feedback implies feedback with

1. oscillations
2. step input
3. negative sign
4. positive sign

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57. s the reference input minus the primary feedback.

1. Manipulated variable
2. Zero sequence
3. Actuating signal
4. Primary feedback

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58. signal will become zero when the feedback signal and reference signs are equal.

1. Input
2. Actuating
3. Feedback
4. Reference

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59. Spring constant in force-voltage analogy is analogous to

1. capacitance
2. reciprocal of capacitance
3. current
4. resistance

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60. Static error coefficients are used as a measure of the effectiveness of closed loop systems for specified input signal.

1. acceleration
2. velocity
3. position
4. all of the above

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