Neets Module 15 Ch. 2

Front 1

a servo is normally designed to move (a) what type of load to (b) what type of positions?
1. (a) small (b) exact
2. (a) small (b) approximate
3. (a) large (b) exact
4. (a) large (b) approximate

Back 1

3. (a) large (b) exact

Front 2

servo systems can be found in which of the following forms?
1. pneumatic
2. hydraulic
3. electromechanical
4. each of the above

Back 2

4. each of the above

Front 3

which of the following systems are control systems?
1. open-loop
2. closed-loop
3. both 1 and 2 above
4. inductive-loop

Back 3

3. both 1 and 2 above

Front 4

a servo system is defined as which of the following types of control systems?
1. number of loops
2. size of the load
3. speed of movement
4. system of feedback

Back 4

4. system of feedback

Front 5

in a dc position servo system, what characteristic of the error signal determines the direction in which the load is driven?
1. amplitude
2. frequency
3. polarity
4. phase

Back 5

3. polarity

Front 6

the sum point in a position servo system combines what two signals to produce an error signal?
1. response and output
2. feedback and output
3. feedback and input
4. output and input

Back 6

3. feedback and input

Front 7

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

Back 7

1. hunting

Front 8

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

Back 8

4. senses speed of the load; error signal present at correspondence

Front 9

what device is usually used to provide feedback in a velocity servo loop?
1. potentiometer
2. tachometer
3. CT
4. CX

Back 9

2. tachometer

Front 10

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

Back 10

3. amplification and damping

Front 11

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

Back 11

3. a large change in the error signal causes maximum damping

Front 12

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

Back 12

2. the input signal oscillates

Front 13

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

Back 13

1. amplifier gain

Front 14

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

Back 14

3. a potentiometer

Front 15

which of the following devices are magnetic error detectors?
1. CXs
2. E-transformers
3. summing networks
4. all of the above

Back 15

2. E-transformers

Front 16

a dc rate generator is used in which of the following loops of a velocity servo system?
1. prime mover
2. feedback
3. control
4. error

Back 16

2. feedback

Front 17

what is the function of a modulator in a servo system?
1. to change the frequency of an ac error signal
2. to impress an ac error signal on an ac carrier
3. to convert a dc error signal to an ac error signal
4. to convert an ac error signal to a dc error signal

Back 17

3. to convert a dc error signal to an ac error signal

Front 18

in a servo system that uses a modulator, what characteristic of the modulator output determines the direction of load movement?
1. amplitude
2. frequency
3. polarity
4. phase

Back 18

4. phase

Front 19

which of the following objects has gyroscopic properties?
1. a spinning top
2. a wheel on a moving bicycle
3. the moving blade assembly of an electric fan
4. each of the above

Back 19

4. each of the above

Front 20

the ability of a gyro to maintain a fixed position in space is referred to by what term?
1. precession
2. rigidity
3. apparent rotation
4. gimbal-stability

Back 20

2. rigidity

Front 21

a gyro will resist all forces that attempt to change its
1. location
2. spin axis direction
3. speed of rotation
4. center of gravity

Back 21

2. spin axis direction

Front 22

what action takes places when an outside force attempts to tilt the spin axis of a gyro?
1. the gyro precesses in the direction of the applied force
2. the gyro precesses in a direction opposite to the applied force
3. the gyro precesses in a direction at a right angle to the applied force
4. the gyro remains fixed in its original position

Back 22

3. the gyro precesses in a direction at a right angle to the applied force

Front 23

for a gyro to be universally mounted, it MUST have a total of how many gimbals, if any?
1. one
2. two
3. three
4. four

Back 23

2. two

Front 24

of the following factors, which one does NOT affect rigidity?
1. rotor speed
2. rotor shape
3. rotor weight
4. rotor position

Back 24

4. rotor position

Front 25

the forces that act through the center of gravity of a gyro and do NOT cause precession are referred to by what term?
1. forces of translation
2. forces of induction
3. forces of isolation
4. forces of erection

Back 25

1. forces of translation

Front 26

which of the following factors determine(s) the amount of precession that will result from a given applied force?
1. rotor speed
2. rotor weight
3. rotor shape
4. all of the above

Back 26

4. all of the above

Front 27

according to the right-hand rule for gyro precession, what does the thumb indicate?
1. spin vector and axis
2. torque vector and axis
3. precession vector and axis
4. axis of rotor rotation only

Back 27

3. precession vector and axis

Front 28

which of the following is a universally mounted gyro?
1. a one-degree-of-freedom gyro
2. a two-degrees-of-freedom gyro
3. a restrained gyro
4. a rate gyro

Back 28

2. a two-degrees-of-freedom gyro

Front 29

which of the following is NOT a difference between IC synchros and standard synchros?
1. amount of torque available
2. construction of the stator
3. construction of the rotor
4. principle of operation

Back 29

4. principle of operation