10
2-11. A position servo system exhibits a series
of overtravels. This condition is known
by which of the following terms?
1. Hunting
2. Overdamping
3. Undershooting
4. All of the above
2-12. A velocity servo has which of the
following characteristics?
1. Senses position of the load; no error
signal at correspondence
2. Senses position of the load; error
signal present at correspondence
3. Senses speed of the load; no error
signal at correspondence
4. Senses speed of the load; error signal
present at correspondence
2-13. What device is usually used to provide
feedback in a velocity servo loop?
1. Potentiometer
2. Tachometer
3. CT
4. CX
2-14. For a servo system to operate smoothly
and efficiently, it must have balance
between which of the following factors?
1. Acceleration and speed
2. Inertia and oscillation
3. Amplification and damping
4. Overshooting and feedback signal
2-15. When friction-clutch damping is used in
a servo system, the first overshoot of the
load may be characterized as
1. small
2. large
3. reversed
4. eliminated
2-16. Error-rate damping is considered to be
better than friction or friction-clutch
damping because of which of the
following characteristics of the error-rate
damping system?
1. A large error signal of short duration
will not be damped
2. A small error signal of short duration
will not be damped
3. A large change in the error signal
causes maximum damping
4. A small change in the error signal
causes maximum damping
2-17. Under what condition would a servo
system that is properly designed and
operating correctly have an oscillating
load?
1. The input signal is large in amplitude
2. The input signal oscillates
3. Error-rate damping is used
4. Friction damping is used
2-18. A servo system is found to be "noisy." If
the bandwidth of the servo amplifier
were adjusted to reject the unwanted
noise signals, which of the following
characteristics of the servo system would
be affected?
1. Amplifier gain
2. Power requirements
3. Correspondence position
4. Error-detection capability
2-19. Which of the following devices can be
used as a position sensor in a servo
system?
1. A summing network
2. An E-transformer
3. A potentiometer
4. A CT
