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77 Cards in this Set

  • Front
  • Back

As motor load is increased, what decreases?


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

with a centrifugal switch

an AC motor produces maximum output torque _____

just before locked rotor

stator field rotation is also called ______

synchronous speed

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


Rotor rotational speed is also called ________

shaft speed

what is slip speed

synchronous speed - shaft speed

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


CEMF and speed are ______


1 horsepower is the power rate corresponding to _______

33000 ft*lb/s

what are the 2 basic components of a motor

poles and armature

what best describes torque?

a twisting action

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

speed increases, torque decreases

100% efficiency means the _______

input power equals the output power

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

3.35 hp

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

1119 W

inefficiency means the _______

input is much greater than the output

electrical power is defined in terms of _________


Speed and torque are _________

inversely proportional

efficiency is measured as a _______


what is motor efficiency?

Ratio of output power to input power.

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


what does CEMF stand for?

Counter Electromotive Force

when is torque maximum?

locked condition.

CEMF opposes the ___________

applied voltage and original conductor magnetic field

1 hp equals how many watts?

746 w

mechanical power is defined in terms of ________


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

the control system provides drive signals for a servo system

how is positional reference derived in a control synchro system

mechanically coupled to the CT

control synchro systems provide high current to rotate radars


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

control transmitter

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

out of phase

what is a control differential trasmitter?


how does a control transolver differ from a control transformer?

the control transolver has an additional rotor winding

what principle of magnetism do generators operate on?

attraction and repulsion

how is pulsating DC output eliminated in DC generators

using a multiple-loop armature

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

comutator and brushes

what principle of magnetism allows the use of electromagnetic stators

passing a current through a conductor produces a magnet

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

is higher than the running current

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

difference amplifier

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


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


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

motor and motor circuits

A TR synchro is a torque _________


A TX synchro is a torque ________


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


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

angular information

the rotor in a synchro ________

is a rotable winding

A CT synchro is a control _______


the 2 classifications of synchros are control synchros and ___________

torque synchros

the purpose of a synchro system is to transfer

angular information

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

conversion factor

the most common motion detectors convert motion into ______


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


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

Tcycle would decrease to 1/2

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


what are the 2 principle factors of motion

Distance and Time

what is motion?

a change in distance per change in time

the differentiator provides an output ________

during acceleration and deceleration

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 ________

runout rate

to convert rpm to rps, simply perform the following:

rpm / 60

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

changing, absolute

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, _________

D is decreased so V would decrease

which is not a popular motion sensor used in industry

photo inductor

runout rate is expressed in terms such as ________


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


the ________ is the actual operating parameter or actual measured value

process variable

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

set point`

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

adjustable gain

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


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


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


which control system provides the poorest performances?


the _______ control reduces overshoot


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


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

proportional control mode