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Assignment Questions - 14187_186
Assignment Questions - 14187_188

Neets Module 15-Principles of Synchros, Servos, and Gyros
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7 1-63.   The output voltage of a control transformer on electrical zero is which of the following relative values? 1.   Equal to the supply voltage 2.   Half the supply voltage 3.   Maximum 4.   Minimum 1-64.   When a tri-speed synchro system is being zeroed, which synchro should be zeroed first? 1.   Coarse 2.   Medium 3.   Largest 4.   Fine 1-65.   What method of zeroing a synchro is the fastest but NOT the most accurate? 1.   The dc voltmeter method 2.   The ac voltmeter method 3.   The synchro-tester method 4.   The electrical-lock method 1-66.   The electrical-lock method of zeroing a synchro requires accessible leads and which of the following conditions? 1.   A rotor free to turn 2.   A stator free to turn 3.   A supply voltage to the stators 4.   A zero-volt potential between S1 and S2 1-67.   A synchro is zeroed by the use of a synchro tester.  After it is zeroed, the S1 and S3 leads are shorted together, and the synchro tester dial moves.  What does this indicate? 1.   The synchro is zeroed correctly 2.   The synchro is not zeroed correctly 3.   The supply voltage is too low 4.   The supply voltage is too high 1-68.   If you find that a synchro has bad bearings, which of the following actions should you take? 1.   Replace the bearing 2.   Lubricate the synchro 3.   Replace the synchro 4.   Continue to use it 1-69.   Which of the following troubles is common in newly installed synchro systems? 1.   Dirty brushes 2.   Improper wiring 3.   Worn slip rings 4.   Shorted synchro windings 1-70.   What type of indicating device is usually installed in the stator circuit of a torque synchro system? 1.   A voltmeter indicator 2.   An ohmmeter indicator 3.   An overload indicator 4.   A blown-fuse indicator 1-71.   A synchro system with four receivers is malfunctioning.  All of the receivers have incorrect readings.  Which of the following is/are the most likely cause(s) of the trouble? 1.   Damper failure 2.   The transmitter 3.   One of the receivers 4.   All of the receivers 1-72.   An ac voltmeter is connected between windings S1 and S3 of a synchro transmitter.  Which of the following rotor positions should give a zero voltage reading? 1. 180º 2. 240º 3. 300º 4. 330º






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