motor controls 2 test review
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| A diode is reversed biased when the ____________ is connected to the negative side of the external voltage source and the _______________ is connected to the positive side.. | show 🗑
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| show | N-type
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| lesson 9 start | show 🗑
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| the __________ region of a PN Junction widens beyond the no bias width, and current flow drops to _____ . | show 🗑
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| show | N/P
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| The small current that does flow in a reverse bias mode is called the _________________ current. | show 🗑
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| show | small signal/power
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| show | Diode
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| show | High/barrier voltage
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| After the barrier voltage is exceeded the diode resistance drops to a ________________ value. | show 🗑
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| show | leakage current/ breakdown point (700v DC)
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| At the Breakdown (point)the reverse voltage is high enough to pull electrons from the atoms shells in the _______________________ | show 🗑
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| The diodes ability to limit current flow to a single direction, makes it an ideal rectifier to convert AC voltage to ______________ ___________________voltage. | show 🗑
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| show | Rectificaion
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| What are the three terminals of the JFET (junction FET)? | show 🗑
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| What are the three terminals of the NPN/PNP transistor? | show 🗑
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| show | voltage
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| show | Triac
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| show | main terminal 2 (MT2)
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| Unlike the SCR the Triac controls current flow during both halves of the AC cycle. | show 🗑
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| show | BJT
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| The ______________________ is controlled by voltage. | show 🗑
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| A ? has three leads, identified as drain, source, and gate. | show 🗑
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| A(n) __________________ has three leads, identified as anode, cathode, and gate. | show 🗑
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| In a Triac ________________________ is initiated by a commentary trigger pulse. | show 🗑
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| Unlike the SCR the Triac controls __________________flow during both halves of the AC cycle. | show 🗑
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| show | momentary trigger
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| show | Triac
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| show | 50
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| start chapter 10 | show 🗑
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| Discrete mechanical sensors have contacts that open and close. Since discrete electronic sensors often do not have mechanical contacts, the output condition is described as activated or de-activated. T/F | show 🗑
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| show | proximity
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| show | Sinking
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| show | direct
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| Discrete mechanical sensors have contacts that open and close. Since discrete electronic sensors often do not have mechanical contacts, the output condition is described as activated or de-activated. | show 🗑
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| The BJT is used most often to link solid state sensors to their _____________________. | show 🗑
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| The BJT has two configurations __________________________ and ____________________________. | show 🗑
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| Sensors that use an NPN transistor to switch DC loads are current- ____________________________ devices. (BJT) | show 🗑
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| show | negative
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| Sensors that use a PNP transistor to switch DC loads are current_____________________ devices. | show 🗑
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| show | positive
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| show | Photoelectric
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| Response time, sensitivity, operation margin, and light/dark operation are four parameters that are commonly used to describe the operation of ? devices | show 🗑
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| Discrete mechanical sensors have contacts that open and close. Since discrete electronic sensors often do not have mechanical contacts, the output condition is described as activated or de-activated. | show 🗑
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| Capacitive, inductive and ultrasonic are three types of ______________ sensors that are based on the sensor’s operating principles. | show 🗑
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| show | condition
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| show | photoelectric
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| show | light/dark operation
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| Proximity sensors that detect objects using an electrostatic field are known as ________ devices. | show 🗑
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| show | Inductive
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| show | Hall effect
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| The input section of the SSR performs the same function as a _________________________ relay | show 🗑
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| A ________ solid-state relay is an electronic device with control functions that include relays, timers, and counters. | show 🗑
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| SSRs are available with a variety of AC or DC input voltages, AC or DC output voltages, and output circuit ampacities from ________amperes to ________ amperes. | show 🗑
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| The input and output sections of an SSR are electrically isolated, by the use of a(n)_____________________. | show 🗑
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| show | coil
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| The output section of an SSR performs the same function as the _______________ of an electromechanical relay. | show 🗑
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| ________________________ is the most common technique used to link SSR inputs to outputs. | show 🗑
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| show | 3 to 32 up to 277
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| show | 2
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| semiconductor fuses are a reliable way to protect solid state relays and are also referred to as ______________________ fuses and provide extremely fast operating (about 2 msec) while restricting pass though current far below the current level that could destroy the SSR | show 🗑
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| Semiconductor fuses fully protect SSRs against rapid rise, ________________________ currents. | show 🗑
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| show | I^2T
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| show | T
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| show | Failure to energize
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| show |
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| show | 3
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| show | Tin
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| The fault current withstand rating of the MCC is determined by the _______________ rated device within the MCC. | show 🗑
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| show | internal power bus
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| Bus material is usually copper, however some installations use __________________ to reduce costs. | show 🗑
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| show | Arcing
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| show | Overheating
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| show | Are Not
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| At a minimum, how often are MCCs checked to avoid unnecessary downtime ? | show 🗑
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| chapter 12 lesson 6 | show 🗑
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| Smaller 3-phase motors are normally controlled using ____________________ voltage across the line starters. | show 🗑
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| The internal power bus distributes power to the control units via a horizontal and a __________________ bus. | show 🗑
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| show | lowers / lessens
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| show | interference
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| The coils of a dual voltage motor are connected in _________________ for higher voltage and in ___________________ for lower voltage. | show 🗑
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| show | Solid-state
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| show | SCR
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| show | gate
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| show | Solid-state reduced voltage starting
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| The____________ the gate has a signal, the _________ the SCR remains on, and the greater the voltage and current is supplied to the motor. | show 🗑
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| ___________________ provide the smoothest acceleration and greatest control of current and torque for squirrel cage motors than any other starting technique. | show 🗑
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| show | retentive
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| Retentive timers are programmed with a preset _________ and a time ________. | show 🗑
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| Non-retentive timers are programmed in a specific mode such as, on-delay, off delay, one shot, or recycle with a preset value and a time base. T/F | show 🗑
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| show | preset
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| show | Time base
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| show | Real Time
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| The ______________ value is the current number of time units a programmed timer has counted after the timing period has been initiated | show 🗑
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| Programmable logic relay timing functions provide an adjustable _____________________ that allows precise timing with accuracy within a hundredth of a second. | show 🗑
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| Programmed timers’ output contacts change state when the ___________________ value equals the preset value. | show 🗑
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| Typical time bases available for programmable timers are 0.01, 0.1, and 1.0 seconds . T/F | show 🗑
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| The actual amount of time a programmable timer measures is the ___________________ value (X) the time base | show 🗑
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| Programmable ____________________ timers can emulate a seven-day time clock. | show 🗑
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| show | accumulated
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| show | Clearing
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| show | coil clearing contacts
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| _______________ latching relays use residual magnetic force to hold the contacts in position after the coil is de-energized. | show 🗑
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| phase sequence relays have a variety of applications such as monitoring compressor lines communication bases and _______. | show 🗑
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| show | Phase sequence relays
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| show | Voltage sensors
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| show | Over voltage/undervoltage and voltage band
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| show |
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| show | Shorted together
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| Single-phase motor speed control circuits use SCR or ______ to control power to the motor for speed control | show 🗑
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| In a single-phase motor speed control, the thyristor controls power in the circuit by changing the ___________ angle of the AC sine wave that drives the motor. | show 🗑
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Created by:
Shawnt321