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Which component is faulty if the motor runs and a signal is not detected at the input of the controller? ---------CORRECT ANSWER-----------------Bad sensing circuitry A system should initially be analyzed using a _______ ---------CORRECT ANSWER-----------------macroscopic approach. Which component is faulty if the input to the motor checks out fine and the motor does not run? ---------CORRECT ANSWER-----------------Bad motor A closed loop feedback system utilizes motor output to create a _______ -- -------CORRECT ANSWER-----------------control signal To isolate the controlling circuitry, one must check the input to the circuit and the _______ ---------CORRECT ANSWER-----------------output from the circuit. To isolate the controlling circuitry, one must check the output from the circuit and the _______ ---------CORRECT ANSWER-----------------input to the circuit.
Human error in troubleshooting could be related to _______ --------- CORRECT ANSWER-----------------motor parameters. equipment setup. input signals. The first step of the troubleshooting procedure is to _______ --------- CORRECT ANSWER-----------------recognize the problem. What is the rpm output of a prime mover that has a radius of 5 inches and is driven by a shaft at 4000 rpm with a radius of 3 inches? --------- CORRECT ANSWER----------------- 2400 What type of motion do nearly all position generators produce? --------- CORRECT ANSWER-----------------Circular What is the weight that one horsepower can lift one foot in one second? ---- -----CORRECT ANSWER----------------- 550 What type of resolver operates as a potentiometer? ---------CORRECT ANSWER-----------------Resistive What type of resolver operates as a transformer with a movable primary coil? ---------CORRECT ANSWER-----------------Inductive
What type of position sensor uses a wheel attached to the primer mover or connected to a moving object? ---------CORRECT ANSWER----------------- Digital What type of digital position sensor uses a reference mark? --------- CORRECT ANSWER-----------------Increment What is the force that turns the shaft of a prime mover called? --------- CORRECT ANSWER-----------------Torque What is the hp of a prime mover if it is rotating at 1500 rpm and has a torque of 45 ft·lb? ---------CORRECT ANSWER-----------------12. What type of error is produced between number bands in an encoder position sensor? ---------CORRECT ANSWER-----------------Transition What type of digital position sensor can use four sensors? --------- CORRECT ANSWER-----------------Code What term describes the force that turns a shaft times the distance the shaft moves? ---------CORRECT ANSWER-----------------Power
What type of position sensor changes a mechanical input to a parallel output? ---------CORRECT ANSWER-----------------digital When is the output of a linear voltage differential transformer zero? --------- CORRECT ANSWER-----------------When the core is centered between the two secondaries What determines the electrical output of a linear inductive position sensor? ---------CORRECT ANSWER-----------------The total induced voltage across series opposing fields What type of resolver is a linear voltage differential transformer? --------- CORRECT ANSWER-----------------Linear Stabilization is reached as the _______ reduces the overshoot of the signal. (PID) ---------CORRECT ANSWER-----------------derivative control mode The _______ control reduces overshoot. ---------CORRECT ANSWER------- ----------PD The _______ is the actual operating parameter or actual measured value. - --------CORRECT ANSWER-----------------process variable The _______ control reaches the set point value but degrades rise time. --- ------CORRECT ANSWER-----------------PI
In a generator, when the armature rotation is parallel to the stator magnetic field, what is the output voltage? ---------CORRECT ANSWER----------------- zero In the motor's voltage source circuit, what is the purpose of IC1? --------- CORRECT ANSWER-----------------Voltage regulator In the motor's voltage source circuit, what is the purpose of R8? --------- CORRECT ANSWER-----------------Manual speed control In the automatic speed control circuit, what happens to the frequency output of ISO1 if the load on M2 increases? ---------CORRECT ANSWER--- --------------decrease In the automatic speed control circuit, what happens to the output of U2 if the load on M2 decreases? ---------CORRECT ANSWER----------------- increase During troubleshooting of a motor-generator set, if the set is not rotating, what is the probable faulted area? ---------CORRECT ANSWER----------------
- Motor and motor circuits What principle of magnetism allows the use of electromagnet stators? ------- --CORRECT ANSWER-----------------Passing a current through a conductor produces a magnet
This schematic represents what type of rotating machine? --------- CORRECT ANSWER-----------------Series DC motor What principle of magnetism do motors operate on? ---------CORRECT ANSWER-----------------Attraction and repulsion In the motor's voltage source circuit, what is the purpose of U1? --------- CORRECT ANSWER-----------------Difference amplifier In a motor, it is important to know that the starting current _______ --------- CORRECT ANSWER-----------------is higher than the running current. What principle of magnetism do generators operate on? ---------CORRECT ANSWER-----------------Passing a conductor through a magnetic field produces voltage How do you troubleshoot an automatic speed control circuit in a motor- generator set? ---------CORRECT ANSWER-----------------Signal tracing circuits What is the primary difference between a DC motor and DC generator? ---- -----CORRECT ANSWER-----------------The power source to the rotor is replaced in a generator with a load.
In a Wye connected alternator, the line voltage is equal to _______ --------- CORRECT ANSWER-----------------phase voltage x 1. In balanced Wye loads, all the resistors are _______ ---------CORRECT ANSWER-----------------equal A single-phase alternator physically resembles a _______ --------- CORRECT ANSWER-----------------single-phase AC motor In an AC generator, the output voltage across the load in the external circuit reverses polarity with every _______ of rotation. ---------CORRECT ANSWER-----------------180° CEMF opposes the _______ ---------CORRECT ANSWER----------------- original conductor magnetic field. applied voltage. Which of the following best describes torque? ---------CORRECT ANSWER- ----------------Twisting action Speed and torque are _______ ---------CORRECT ANSWER----------------- inversely proportional.
One horsepower is the power rate corresponding to _______ --------- CORRECT ANSWER-----------------33,000 ft·lb/min. What are the two basic components of a motor? ---------CORRECT ANSWER-----------------Poles and armature What is motor efficiency? ---------CORRECT ANSWER-----------------Ratio of output power to input power. If a motor is supplied 2500 watts of electrical energy, how much horsepower would it supply? ---------CORRECT ANSWER-----------------3. hp Mechanical power is defined in terms of _______ ---------CORRECT ANSWER-----------------horsepower. Inefficiency means the _______ ---------CORRECT ANSWER----------------- input is much greater than output. 100% efficiency means the _______ ---------CORRECT ANSWER------------- ----input power equals output power. When is torque maximum? ---------CORRECT ANSWER----------------- Locked condition
What is the rate of acceleration? ---------CORRECT ANSWER----------------- 4 ft/s/s How is acceleration or deceleration symbolized? ---------CORRECT ANSWER-----------------a What is acceleration? ---------CORRECT ANSWER-----------------A change in velocity What is the velocity at point B? ---------CORRECT ANSWER----------------- 4 ft/s Runout rate (ROR) is expressed in terms such as _______ --------- CORRECT ANSWER-----------------feet/second. The differentiator provides an output _______ ---------CORRECT ANSWER-----------------during acceleration and deceleration. When velocity and distance traveled are plotted, what would the graph look like for a fixed velocity over time? ---------CORRECT ANSWER----------------- Straight line increasing over time What is the relationship between distance and time when solving for velocity (V)? ---------CORRECT ANSWER-----------------ΔD/ΔT
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, _______ --------- CORRECT ANSWER-----------------D is decreased so V would decrease. An rpm detector circuit with an F/V converter chip uses a disk with 100 marks/revolution and has a conversion factor (CF) of 2 V / kHz. Each 0. volts out of the chip represents _______ rpm. ---------CORRECT ANSWER- ---------------- 60 What is the velocity from point B to point C? ---------CORRECT ANSWER--- --------------8 ft/s What is motion? ---------CORRECT ANSWER-----------------A change in distance per change in time Which is not a popular motion sensor used in industry? ---------CORRECT ANSWER-----------------Photo Inductor In an F/V converter, the ratio between the input frequency and the output voltage is known as the _______ ---------CORRECT ANSWER----------------- conversion factor. For measuring rpm on a spinning shaft, the distance (D) between the sensing edges is _______ ---------CORRECT ANSWER----------------- unimportant.
What happens to velocity during deceleration? ---------CORRECT ANSWER-----------------Decreases To convert rpm to rps, simply perform the following: ---------CORRECT ANSWER-----------------rpm ÷ 60 Troubleshooting can eventually be reduced to a _______ --------- CORRECT ANSWER-----------------component level. The second step of the troubleshooting procedure is to _______ --------- CORRECT ANSWER-----------------eliminate human error. What is another name for a position generator? ---------CORRECT ANSWER-----------------Prime mover The _______ is the optimum operating parameter, or a reference to which an operator adjusts the process for optimum operation. ---------CORRECT ANSWER-----------------set point Which control system provides the poorest performance? --------- CORRECT ANSWER-----------------P Proportional control uses an _______ as the means to increase rise time. -- -------CORRECT ANSWER-----------------adjustable gain
A typical stepper motor has how many stator poles? ---------CORRECT ANSWER----------------- 4 If a stepper motor has 6 stator poles and 100 rotor nodes, what is the PPR of the motor? ---------CORRECT ANSWER----------------- 600 What type of rotor does a stepper motor use? ---------CORRECT ANSWER- ----------------(an) Permanent magnet What is a valid reason for using two-phase energized step patterns? --------- CORRECT ANSWER-----------------Smoother motor action A stepper motor is classified as a/an _______ motor. ---------CORRECT ANSWER-----------------incremental How are a stepper motor and AC motor similar? ---------CORRECT ANSWER-----------------Frequency of input waveform determines speed of motor. If a stepper motor has 6 stator poles and 100 rotor nodes, what is the value of one step (in degrees)? ---------CORRECT ANSWER-----------------0.
What is the purpose of the counter in a stepper motor's circuitry? --------- CORRECT ANSWER-----------------Determines CW or CCW motor rotation Which circuit in a stepper motor system develops the proper sequence of energizing the stator coils? ---------CORRECT ANSWER----------------- Controller What is the sequence of energizing the stators for a two-phase energized CCW pattern? ---------CORRECT ANSWER-----------------AB', A'B', BA', AB What is the sequence of energizing the stators for a one-phase energized CW pattern? ---------CORRECT ANSWER-----------------A, B, A', B' What is the term used to describe the number of degrees that a stepper motor rotates for each input pulse? ---------CORRECT ANSWER--------------- --Step Which circuit in a stepper motor system develops the power necessary to energize the stators? ---------CORRECT ANSWER-----------------Driver What type of signal turns Q1 ON? ---------CORRECT ANSWER----------------
If a stepper motor operates in the Step mode but does not operate in the Run mode, what is the probable faulted area? ---------CORRECT ANSWER-----------------Oscillator circuit Which two rates must the pps not exceed? ---------CORRECT ANSWER----- ------------SR and EFSS What is the purpose of D2 in the driver circuit? ---------CORRECT ANSWER-----------------Prevents damage to Q What level is on top of D2 when Q1 is ON? ---------CORRECT ANSWER---- -------------LOW Which formula calculates rpm of a stepper motor? ---------CORRECT ANSWER-----------------pps times 60 times step divided by 360 What is the following circuit called? (stepper controller) ---------CORRECT ANSWER-----------------Ramp up-down circuit Given the following stepper motor with a coil activation sequence of QA to QD, what direction will the rotor rotate? ---------CORRECT ANSWER--------- --------Clockwise What is the simplest type of controller? ---------CORRECT ANSWER---------- -------Full-step single-phase
