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Assignment Questions - 14187_190
Assignment Questions - 14187_192

Neets Module 15-Principles of Synchros, Servos, and Gyros
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11 2-20.    Which of the following devices are magnetic error detectors? 1.   CXs 2.   E-transformers 3.   Summing networks 4.   All of the above 2-21.    A dc rate generator is used in which of the following loops of a velocity servo system? 1.   Prime mover 2.   Feedback 3.   Control 4.   Error 2-22.    What is the function of a modulator in a servo system? 1.   To change the frequency of an ac error signal 2.   To impress an ac error signal on an ac carrier 3.   To convert a dc error signal to an ac error signal 4.   To convert an ac error signal to a dc error signal 2-23.    In a servo system that uses a modulator, what characteristic of the modulator output determines the direction of load movement? 1.   Amplitude 2.   Frequency 3.   Polarity 4.   Phase 2-24.    What phase relationships between the input and reference signals are sensed by a servo demodulator? 1. 0º and 180º 2. 45º and 225º 3. 90º and 270º 4.   135º and 315º 2-25.    In a properly operating servo system, what is the phase relationship between the reference voltages to the error detector and the demodulator? 1.   In phase only 2.   180º out of phase only 3.   Out of phase; somewhere between 0º and 180º 4.   In phase or 180º out of phase, depending on the demodulator input 2-26.    Which of the following should be a characteristic of a servo amplifier? 1.   Narrow frequency band 2.   High output impedance 3.   180º phase shift 4.   Low noise level 2-27.    An ac servo motor would probably be used instead of a dc servo motor in which of the following situations? 1.   To move heavy loads at a constant speed 2.   To move heavy loads at variable speeds 3.   To move light loads at a constant speed 4.   To move light loads at variable speeds 2-28.    Which of the following circuits that is required in a multispeed servo system is NOT required in a single-speed servo system? 1.   Position sensor 2.   Error detector 3.   Feedback loop 4.   Synchronizer






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