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ET1 SEP EXAM 2018 > NAVEDTRA 14187A, NAVY ELECTRICITY AND ELECTRONICS TRAINING SERIES MODULE 15- PRINCIPLES OF SYNCHROS, SERVOS, AND GYROS > Flashcards

NAVEDTRA 14187A, NAVY ELECTRICITY AND ELECTRONICS TRAINING SERIES MODULE 15- PRINCIPLES OF SYNCHROS, SERVOS, AND GYROS Flashcards

1
Q

Which name is given to a variety of rotary, electromechanical, position-sensing devices?

A

Synchro

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2
Q

Which principle does a synchro run on?

A

Electromagnetic induction

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3
Q

Synchros are used primarily for the rapid and accurate transmission of what between equipment and stations?

A

Information

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4
Q

What are the two general classifications of synchro systems?

A

Torque and Control

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5
Q

Which type of synchros are used in systems that are designed to move heavy loads such as gun directors, radar antennas, and missile launchers?

A

Control

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6
Q

Which two broad categories can the synchros used in the Navy be grouped into?

A

Military standard and Prestandard Navy

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7
Q

How many symbols meet the standard military specifications for schematic diagrams of synchros and synchro connections?

A

Five

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8
Q

When a symbol is used on a schematic, it will be accompanied by the military abbreviation of one of how many synchro functional classifications?

A

Eight

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9
Q

What are the two common types of synchro rotors in use?

A

Salient-pole and Drum/Wound

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10
Q

Which part of a synchro is a cylindrical structure of slotted laminations on which three Y-connected coils are wound with their axes 120 degrees apart?

A

Stator

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11
Q

What is a measure of how much load a machine can turn?

A

Torque

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12
Q

Which unit of measurement are torque synchro measurements in?

A

Ounce-inches

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13
Q

What is the measurement of work?

A

Foot-pounds

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14
Q

The strength of the magnetic field produced by what determines the torque?

A

Stator

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15
Q

Military standard and Navy prestandard synchros are designed to operate on either 115 volts or how many volts?

A

26

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16
Q

Synchros used in shipboard equipment are designed predominately for how many volts?

A

115

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17
Q

How many volts do most aircraft synchros operate on?

A

26

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18
Q

Which frequency are synchros designed to operate on?

A

60 or 400 Hz

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19
Q

What is the most widely used frequency for airborne equipment?

A

400 Hz

20
Q

Standard synchros are designed to withstand surrounding temperatures ranging from -67 degrees F to what at the terminal board?

A

+257 degrees F

21
Q

Prestandard synchros operate in a range of -13 degrees F to what temperature?

A

185 degrees F

22
Q

To meet military specifications, all standard synchros must be capable of continuous operation for 1,000 hours at how many revolutions per minute (rpm) without a load?

A

1,200

23
Q

Low-speed prestandard synchros must be capable of continuous operation for how many hours at 300 rpm without a load?

A

500

24
Q

Low-speed prestandard synchros must be capable of continuous operation for 1,500 hours at what RPM without a load?

A

1200

25
Q

Which type of transmitter converts the angular position of its rotor (mechanical input) into an electrical output signal?

A

Synchro torque

26
Q

The turns ratios in synchros may vary widely, depending on design and application, but there is commonly a stepdown of what between the rotor and a single coil?

A

2.2:1

27
Q

What stator voltages are measured, reference is always made to what voltages instead of to a single coil’s voltage?

A

Terminal-to-terminal

28
Q

Synchro torque receivers, commonly called synchro receivers, are electrically identical to torque transmitters of the same size except for the addition of some form of what?

A

Damping

29
Q

What are two types of damping methods?

A

Electrical and Mechanical

30
Q

Which condition exists when both transmitter and receiver rotors in a synchro system are on zero or displaced from zero by the same angle?

A

Correspondence

31
Q

What is the angle called through which a transmitter rotor is mechanically rotated?

A

Signal

32
Q

What is necessary to determine the actual position of the synchros rotor?

A

Labeling

33
Q

When large amounts of power and a higher degree of accuracy are required, as in the movement of heavy radar antennas and gun turrets, torque synchro systems give way to the use of what type of synchros?

A

Control

34
Q

What is a control synchro device accurately governing some type of power amplifying device used for moving heavy equipment?

A

Control transformer

35
Q

Which Control Transformer (CT) windings are considered to be the primary windings?

A

Stator

36
Q

Which type of simple system should the synchro capacitor never be used in?

A

Transmitter-receiver

37
Q

Data that covers a wide range of values are handled very effectively and still maintain a high degree of accuracy in what type of synchro system?

A

Multispeed

38
Q

The advent of long-range missiles and high-speed aircraft has brought about the need for accurately transmitting very large quantities. This is best done by what type of synchro system?

A

Tri-speed

39
Q

What is the reference point for alignment of all synchro units?

A

Electrical Zero

40
Q

What is the most accurate method of zeroing a synchro?

A

AC voltmeter

41
Q

For the AC voltmeter method of zeroing a synchro to be as accurate as possible, an electronic or precision voltmeter having 0- to 250-volt and a 0- to 5- volt ranges should be used. On the low scale this meter should also be able to measure voltages as low as what?

A

0.1 volt

42
Q

How many conditions must exist for a control transformer (CT) to be on electrical zero?

A

Two

43
Q

What is perhaps tile (the?) fastest method of zeroing synchros?

A

Electrical lock

44
Q

What are used primarily for quickly locating a defective synchro?

A

Synchro testers

45
Q

Which method is used in synchro receivers to prevent the rotor from oscillating or spinning?

A

Damping

46
Q

What is a low voltage used in multispeed synchro systems that contain CTs to prevent false synchronizations?

A

Stickoff voltage

47
Q

Which signal lights are used to aid maintenance personnel in locating synchro trouble quickly?

A

Trouble indicators

ET1 SEP EXAM 2018 (28 decks)

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