6
1-52. What does the gear ratio between the two
transmitters in a dual-speed synchro
system determine?
1. The direction of transmitter-rotation
2. The direction of receiver rotation
3. The speeds of transmission
4. The relative direction of rotation
1-53. Which of the following synchro systems,
if any, should be used to transmit very
large quantities?
1. Single-speed
2. Two-speed
3. Tri-speed
4. None of the above
1-54. Which of the following is a disadvantage
of a double receiver as compared to two
single receivers?
1. The entire unit must be replaced if
one portion fails
2. It takes up much more space
3. It is much more costly
4. It is much heavier
1-55. The voltage used to prevent false
synchronizations is known by what term?
1. Error voltage
2. Signal voltage
3. Source voltage
4. Stickoff voltage
1-56. What is the reference point for the
alignment of all synchro units?
1. Mechanical zero
2. Electrical zero
3. Mechanical null
4. Electrical null
1-57. What is the most accurate method of
aligning a synchro?
1. The dc voltmeter method
2. The ac voltmeter method
3. The synchro-tester method
4. The electric-lock method
1-58. During synchro alignment, what is the
purpose of the coarse setting?
1. To ensure a setting of zero degrees
rather than 180 degrees
2. To prevent the voltmeter from being
overloaded
3. To keep the synchro device from
overheating
4. To correct the fine setting
1-59. If a synchro receiver is properly zeroed,
when do the stator windings have
electrical zero voltages?
1. When the rotor is moving
2. When the rotor is stopped
3. When the rotor is at 270 degrees
4. When the rotor is at its reference
position
1-60. When a 115-volt synchro transmitter is
set on its coarse-zero position,
approximately what voltage should be
read on a voltmeter?
1. 15 volts
2. 26 volts
3. 37 volts
4. 193 volts
1-61. When a 115-volt source is used during
the alignment of a differential synchro,
what is the maximum time the circuit can
be energized without causing damage to
the synchro?
1. 1 minute
2. 2 minutes
3. 15 minutes
4. 30 minutes
1-62. After a control transformer has been
zeroed and clamped down, what is the
final step in the zeroing procedure?
1. Replace the fuses
2. Turn it to 270 degrees
3. Recheck the zero voltage reading
4. Disconnect all wires to the control
transformer
