3
1-21. What is the minimum number of synchro
devices needed for a simple synchro
transmission system?
1. One
2. Two
3. Three
4. Four
1-22. In a simple synchro system, what leads
are connected to the source voltage?
1. R1 and R2
2. S1 and S2
3. S2 and S3
4. R1 and S1
1-23. When a synchro transmitter, and receiver
are in correspondence, what is the
relative value of the (a) current through
the stators and (b) receiver torque?
1. (a) Maximum
(b) maximum
2. (a) Maximum
(b) minimum
3. (a) Minimum
(b) minimum
4. (a) Minimum
(b) maximum
1-24. What term applies to the angle through
which a synchro transmitter rotor is
rotated mechanically?
1. Lag
2. Lead
3. Gain
4. Signal
1-25. If a synchro receiver is required to rotate
in a direction opposite to the rotation of
the transmitter rotor, what leads should
be reversed?
1. R1 and R2
2. S1 and S2
3. S2 and S3
4. S1 and S3
1-26. If a synchro receiver and transmitter are
always 180 degrees out of phase with
each other, what leads are reversed?
1. R1 and R2
2. S1 and S2
3. S2 and S3
4. S1 and S3
1-27. What type of synchro can accept two
signals simultaneously and add or
subtract?
1. Transmission
2. Differential
3. Automatic
4. Shiftless
1-28. What are the two types of synchro
devices that will accept two inputs?
1. TR and TX
2. TR and TDX
3. TDR and TX
4. TDR and TDX
1-29. What types of synchro devices have (a)
one electrical and one mechanical input
and an electrical output; and (b) two
electrical inputs and a mechanical
outputs?
1. (a) TR
(b) TX
2. (a) TX
(b) TR
3. (a) TDX
(b) TDR
4. (a) TDR
(b) TDX
1-30. What determines whether a differential
synchro device adds or subtracts its
inputs?
1. The way it is connected in the system
2. The direction of rotor movement
3. The number of stator windings
4. The supply voltage polarity
