Att Fc Test 10

Front 1

As motor load is increased, what decreases?

Back 1

RPM

Front 2

how is the start winding of an AC induction motor disconnected from the circuit?

Back 2

with a centrifugal switch

Front 3

an AC motor produces maximum output torque _____

Back 3

just before locked rotor

Front 4

stator field rotation is also called ______

Back 4

synchronous speed

Front 5

which of the following defines synchronous speed? (N = Pole Pairs)

Back 5

60*f/n

Front 6

Rotor rotational speed is also called ________

Back 6

shaft speed

Front 7

what is slip speed

Back 7

synchronous speed - shaft speed

Front 8

an AC motor is typically described as a one-, two-, or three-_____ motor

Back 8

phase

Front 9

CEMF and speed are ______

Back 9

proportional

Front 10

1 horsepower is the power rate corresponding to _______

Back 10

33000 ft*lb/s

Front 11

what are the 2 basic components of a motor

Back 11

poles and armature

Front 12

what best describes torque?

Back 12

a twisting action

Front 13

As CEMF increases, what happens to conductor speed and torque?

Back 13

speed increases, torque decreases

Front 14

100% efficiency means the _______

Back 14

input power equals the output power

Front 15

if a motor is supplied 2500 watts of electrical energy, how much horsepower would it supply

Back 15

3.35 hp

Front 16

if a motor is producing 1.5 hp, how much electrical power is it absorbing? (assume no internal loss)

Back 16

1119 W

Front 17

inefficiency means the _______

Back 17

input is much greater than the output

Front 18

electrical power is defined in terms of _________

Back 18

watts

Front 19

Speed and torque are _________

Back 19

inversely proportional

Front 20

efficiency is measured as a _______

Back 20

percent

Front 21

what is motor efficiency?

Back 21

Ratio of output power to input power.

Front 22

what is the efficiency rating of a theoretically "perfect" rotating machine

Back 22

100%

Front 23

what does CEMF stand for?

Back 23

Counter Electromotive Force

Front 24

when is torque maximum?

Back 24

locked condition.

Front 25

CEMF opposes the ___________

Back 25

applied voltage and original conductor magnetic field

Front 26

1 hp equals how many watts?

Back 26

746 w

Front 27

mechanical power is defined in terms of ________

Back 27

horsepower

Front 28

what is the major difference between the torque synchro system and the control synchro system?

Back 28

the control system provides drive signals for a servo system

Front 29

how is positional reference derived in a control synchro system

Back 29

mechanically coupled to the CT

Front 30

control synchro systems provide high current to rotate radars

Back 30

false

Front 31

which device in the control synchro system performs the same function as the torque transmitter?

Back 31

control transmitter

Front 32

when synchronized, what is the output from a control transformer?

Back 32

out of phase

Front 33

what is a control differential trasmitter?

Back 33

CDX

Front 34

how does a control transolver differ from a control transformer?

Back 34

the control transolver has an additional rotor winding

Front 35

what principle of magnetism do generators operate on?

Back 35

attraction and repulsion

Front 36

how is pulsating DC output eliminated in DC generators

Back 36

using a multiple-loop armature

Front 37

what part of a motor allows reversing the magnetic poles in the rotor?

Back 37

comutator and brushes

Front 38

what principle of magnetism allows the use of electromagnetic stators

Back 38

passing a current through a conductor produces a magnet

Front 39

in a motor it is important to know that the starting current _________

Back 39

is higher than the running current

Front 40

in the motor's voltage source circuit, what is the purpose of U1

Back 40

difference amplifier

Front 41

in a generator, when the armature rotation is parallel to the stator magnetic field, what is the output voltage?

Back 41

zero

Front 42

what principle of magnetism allows a generator to power its own windings and still generate an output voltage?

Back 42

retentitivity

Front 43

during troubleshooting of a motor-generator set, if the set is not rotating, what is the probable faulted area?

Back 43

motor and motor circuits

Front 44

A TR synchro is a torque _________

Back 44

receiver

Front 45

A TX synchro is a torque ________

Back 45

transmitter

Front 46

Two basic components of a synchro are the staor and the ________

Back 46

rotor

Front 47

the mechanical movement of a synchro produces a voltage that represents _________

Back 47

angular information

Front 48

the rotor in a synchro ________

Back 48

is a rotable winding

Front 49

A CT synchro is a control _______

Back 49

transolver

Front 50

the 2 classifications of synchros are control synchros and ___________

Back 50

torque synchros

Front 51

the purpose of a synchro system is to transfer

Back 51

angular information

Front 52

in an F/V converter, the ration between the input and the output voltage is known as the _______

Back 52

conversion factor

Front 53

the most common motion detectors convert motion into ______

Back 53

frequency

Front 54

What is the relationship between distance and time when solving for velocity (V)

Back 54

(change)D/(change)T

Front 55

if the number of sensing holes were doubled from 16 to 32, for a given rpm, the pulse train _______

Back 55

Tcycle would decrease to 1/2

Front 56

an rpm detector circuit with an F/V converter chip uses a dis with 100 marks/revolution and has a conversion factor of 2v/khz. each 0.2 volts of the chip represents ________ rpm

Back 56

60

Front 57

what are the 2 principle factors of motion

Back 57

Distance and Time

Front 58

what is motion?

Back 58

a change in distance per change in time

Front 59

the differentiator provides an output ________

Back 59

during acceleration and deceleration

Front 60

for calculating the velocity of the disk holes at various rpm values, the radius to the center of the holes and the distance between the holes are used to solve for ________

Back 60

runout rate

Front 61

to convert rpm to rps, simply perform the following:

Back 61

rpm / 60

Front 62

An electrical differentiator circuit will sense a ________ voltage and disregard _______ values

Back 62

changing, absolute

Front 63

if the sensor holes were moved closer to the center of the disk but the same number of holes were used, at a given rpm, _________

Back 63

D is decreased so V would decrease

Front 64

which is not a popular motion sensor used in industry

Back 64

photo inductor

Front 65

runout rate is expressed in terms such as ________

Back 65

feet/second

Front 66

for measuring rpm on a spinning shaft, the distance between the sensing edges is

Back 66

unimportant

Front 67

the ________ is the actual operating parameter or actual measured value

Back 67

process variable

Front 68

the ________ is the optimum operating parameter, or a reference to which an operator adjusts the process for optimum operation

Back 68

set point`

Front 69

proportional control uses an ______ as the means to increase rise time

Back 69

adjustable gain

Front 70

what control compensates for a changing value and inhibits rapid changes in the output value?

Back 70

derivitive

Front 71

the _______ control reaches the set point value but degrades rise time

Back 71

PI

Front 72

which control system provides a fast rise time, minimal overshoot, and quick response to outside influences?

Back 72

PID

Front 73

which control system provides the poorest performances?

Back 73

P

Front 74

the _______ control reduces overshoot

Back 74

PD

Front 75

what is the condition which indicates that the values of a circuit have settled and tend to remain constant?

Back 75

steady-state

Front 76

stabilization is reached as the _______ reduces the overshoot of the signal.

Back 76

proportional control mode

Front 77

;

Back 77

l