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WorksheetsEETC 2311 Power Technology Mid-Term Review
Total questions: 112
Worksheet time: 1hrs 1mins
The waveform that is produced by alternating current looks like a what?
Sine Wave
Longitudinal Wave
Cosine Wave
Transverse Wave
Which of the following is a device that converts rotational mechanical energy into electrical energy in the form of direct current.
One-Phase AC Motor
Three-Phase AC Motor
DC Generator
Armature Generator
Which of the following is common components of a permanent capacitor motor?
Armature
Start Windings
Magnetic Field
Shunt Windings
Which of the following is common components of a permanent capacitor motor?
Run Windings
Shunt Configuration
AC Wiring
Armature
Which of the following is common components of a permanent capacitor motor?
Magnetic
Capacitor
Shunt Wiring
Magnetic Windings
Which of the following is a disadvantage of a permanent capacitor motor?
Low Starting Torque
High Starting Torque
Less Expensive
Very Expensive
What is the power used by a load?
AC Power
DC Power
Watt Power
Active Power
AC electricity flowing in a particular wire is called a what?
Current
Phase
Conductor
Voltage
The ______ and the ______ of a DC generator rectify the output of the generators.
(a)
The frequency of the AC electricity in most European countries is what?
20Hz
50Hz
80Hz
100Hz
Three phase AC motors can be ______ or ______.
(a)
About 95% of the AC motors used in industry are what type of motors?
Synchronous
Induction
Three-Phase Generator
DC Shunt Configuration
_______ are windings connected in series with the armature windings to help reduce arcing between the commutator and brushes?
Interpoles
Commutator
Shunt Windings
Series Windings
The rate at which the electrical voltage or current cycle repeats is called what?
Current
Hertz
Voltage Drops
Frequency
The power that is supplied to a load by an AC power source is what?
Apparent Power
Three Phase Power
DC Power
AC Power
What is one of the advantages of a permanent motor?
High Ratio
Low Torque
Higher Efficiency
High Cost
What is one of the advantages of a permanent motor?
Quieter Running
High Torque Ratio
High Cost
Large Voltage
What is one of the advantages of a permanent motor?
Higher Maintenance Cost
Low Efficiency
Lower Maintenance Cost
Permanent Voltage
The effective value of AC voltage is also called the _________ voltage
Maximum
Root Mean Square
AC
Minimum
________ can be determined by connecting the leads of a meter to the output terminals of a generator while it is rotating.
Resistance
Voltage
Brush Polarity
Torque Ratio
What is the average range of slip for a squirrel cage induction motor?
2-6%
5%
8-10%
1-3%
A capacitor start motor produces more starting torque than a split phase motor because the capacitor creates a larger phase between the winding current.
True
False
_______ is a distortion of the field pole magnetic field caused by the armature winding magnetic field.
Slip
Magnetic Field
Bruh Polarity
Armature Reaction
How does a squirrel cage motor get its name?
Its Maximum Voltage
Its Design of the Rotor
Its Configuration (Three Configurations)
Its Wiring (Amount of wires)
The cost of electrical power is base on what?
(a)
The amount of two electrical waveforms are out of phase is measured in brush polarities.
True
False
The amount of two electrical waveforms are out of phase is measured in degrees.
True
False
What kind of generator is the most widely used generator configuration because it provides nearly constant voltage under varying load conditions?
Compound
Series
AC
Shunt
The three phases that are fed to the stator windings of a three phase motor are how many degrees apart?
25
180
90
120
A fan and a blower are applications of a what?
Self-Excited Configuration
Permanent Capacitor Motor
Separately-Excited Configuration
Three Phase Motor
The phases of the three-phase power supplied by the power company are 90 degrees out of phase with each other.
True
False
The phases of the three-phase power supplied by the power company are 120 degrees out of phase with each other.
True
False
A series generator produces only a small voltage when ____ load is connected.
No
A Small
A Large
As the load on a series generator increases, the output voltage _____.
Stays the Same
Decreases
Increases
When two phases of electricity start and end at the same time, they are said to be out of phase.
True
False
When two phases of electricity do not start and end at the same time, they are said to be out of phase.
True
False
Three phase is a type of what? (If you get this wrong, then you are so dumb)
(a)
What requires an external DC sources to provide current to a shunt field winding.
Shunt Wielding Generator
Self-Excited Generator
Separately-Excited Generator
Three Phase Generator
High efficiency, high power factor, and excellent speed regulation are advantages of what?
Three Phase AC Motors
Self-Excited Motors
Separately-Excited Motors
Single-Excited Motors
Adding capacitors is not a method to adjust the speed of a what?
Separately-Excited Motor
Single-Excited Motor
Three-Phase Motor
Permanent Capacitor Motor
Increased cost due to the addition of a capacitor is a disadvantage of a what?
Capacitor-Start Motor
Permanent Capacitor Motor
Self-Excited Motor
AC Motor
The ratio of active power to apparent power in an AC circuit is called a what?
Magnetic Field
Wye Configuration
Torque Ratio
Power Factor
Large conveyors, machine tools, and large pumps are applications of what type of motor?
Self-Excited
Three-phase
Shunt
Series
Capacitor-start, permanent-capacitor, and split phase are all types of what motors?
Single Phase AC Motors
Three Phase AC Motors
Single Phase DC Motors
Three Phase DC motors
In a split phase AC motor, the start winding is where the current starts to flow first
True
False
The residual magnetism in the shunt field of a self excited shunt generator induces a voltage across the armature windings as the armature rotates.
True
False
What type of motor is essentially a combination of a capacitor start and a permanent capacitor motor?
Capacitor Start Capacitor Run
Single Phase
Multi-Purpose
Series
As the current draw of the load increases a self excited shunt generator, what does the output voltage do?
Increases
Decreases
Stays the Same
Instantly goes to 0
For a self excited shunt generator, the size of the load determines how much of the current flows to the loads and how much flows through the shunt winding.
True
False
A power factor of 100% is called what?
Absolute Power Factor
Maximum Power Factor
Revolting Power Factor
Unity Power factor
Metalized Power factor
On what type of system does the neutral conductor provide a common return path to the source of each phase?
3 wire wye system
4 wire wye system
5 wire wye system
24 wire wye system
The device used on a split phase motor to disconnect the start winding when a predetermined speed has been reached is called a what?
Wye Configuration
Your mother
DC Generator
Centrifugal Switch
Power tools, pumps, and small machines are applications of a what?
Induced Motor
Single Phase motor
Capacitor Start motor
Three Phase motor
The main set of winding in a split phase motor is called what?
Run Windings
Shunt Windings
Start Windings
Series Windings
The shunt field winding of a(n) _______ does not depend on the armature to provide its excitation current.
Three Phase Generator
Series Generator
Separately-Excited Shunt Generator
Self-Excited Shunt Generator
Quiet running, high running torque, and high starting torque are advantages of what type of motor?
Induction
Capacitor Run
Capacitor Start
Capacitor start capacitor run
The most common configuration used at a substation is what?
Capacitor Configuration
Wye Configuration
Series Configuration
Shunt Configuration
A (a) separates input devices to the left side and output devices to the right side of the diagram
The type of signal that is carried by a wire inside an electrical panel is indicated by what?
Wire Density
Wire Current
Wire Length
Wire Insulator Color
Power factor correction capacitors are rated in what?
By the use of a DMM
Current-Voltage-Resistance
Hertz-Watt-Inductive
Volts-Amperes-Reactive
What is an advantage of a Split Phase Motor?
Low Starting Torque
Low Cost
Less Resistance
High Running Torque
Ladder Diagrams with multiple pages use arrows and notes to indicate what?
Previous and Next pages
Resistance Size
Voltage, Current, and Resistance
Wire Length and Induction
What is the most common type of capacitor motor?
(a)
A resistor that is used to reduce the sparking across the contacts of the centrifugal switch on a capacitor start motor is called what?
(a)
Most large DC generators use the ______ configuration because it provides a performance middle ground.
Series
Compound
Shunt
Three Phase
A ________ generator results when the series field and shunt field are combined so that the output voltage is nearly constant regardless of load.
Self-Excited
Flat Compound
Separately-Excited
Compound
Curved Compound
What type of configuration us most often used in applications where most of the loads requires three phase power and single phase power is only needed for lighting and office equipment?
Delta
4 wire Wye
Wye
Beta
The speed at which the rotor/shaft of an AC motor must rotate to exactly match the speed of the rotating magnetic field is called what?
Active Power
Unity Power
Maximum Velocity
Synchronous Speed
Which of the following configurations is a three phase electrical distribution configuration?
Wye
Series
4 Line Wye
Shunt
The ______ designates difference enclosure types based on environmental conditions.
National Electrical Manufacturers Association (NEMA)
Occupational Safety and Health Administration (OSHA)
Digital Multi-Meter (DMM)
ORCA
Wire numbers attached to wires in an electrical panel should match the wire numbers shown on the electrical print.
False
True
The difference between the synchronous speed and the actual speed at which an AC motor will run is called what?
Slip
Brush Polarity
Degrees
Contraction
What is the common value for a bleeder resistor?
20K Hertz
15K Ohms
20K Ohms
180K Ohms
In a Delta system, what amount of VAC is not available?
148 VAC
204 VAC
208 VAC
240 VAC
It is good practice to limit the number of connections per terminal block to three or more wires.
False
True
________ are installed inside the electrical panels in a certain pattern according to the wiring function.
Certain Cites
Terminal Blocks
Certain Blocks
Terminal Cites
The wiring diagram's left side rail should have which number?
(a)
It is good practice to limit the number of connections per terminal block to two or less wires.
False
True
Wires that run between the control panel add operator station must enter and exit the panels through what?
Terminal Blocks
Terminal Cites
Connection Cites
Certain Cites
Which of the following identifies a wire's signal type in an electrical panel?
Wire Strength
Wire Density
Wire Number
Wire Color
In a Wye system, what amount of VAC is not available?
240 VAC
280 VAC
208 VAC
204 VAC
When a load is applied to a cumulative compound generator, the current through the shunt winding does what?
Increases
Decreases
Stays the same
The fourth color bans on a resistor represents the _________ of the resistance value.
Voltage
Torque
Tolerance
Current
Fan, centrifugal pump, and business machines are all applications of what type of motor?
Three Phase
Single Phase
Split Phase
Induction
Wye and Delta configuration are used in what type of motors?
Double Phase Induction
Step Phase Induction
Single Phase Induction
Three Phase Induction
An overcurrent protection device for a motor control circuit operation with a motor FLA of 20 amps should be sized for at least 25 amps.
False
True
When testing a circuit breaker in the closed position, the resistance between the terminals should measure less than how many ohms?
1
2
3
4
An under compound generator tends to act like what kind of generator?
Shunt
Capacitor run capacitor start
Capacitor start capacitor run
Three phase
If the winding halves on a wye halves of a delta three phase motor are connected in series, the motor is connected for what?
No Voltage
Low Voltage
High Voltage
Connecting the winding halves of a delta motor in parallel connects the motor for high voltage connections.
True
False
What is the accepted industry standard for reversing a three phase motor? (If you get this wrong then you are dumb)
(a)
Reversing the start winding connecting and reversing the run winding connections will reverse the rotation of a split phase motor.
True
False
The function of a(n) ________ is to show how components in an electrical system are connected and sometimes where they are located.
Ladder Diagram
PCB
Electrical Print
In a ladder diagram, power supplies are represented by the diagrams two ______.
Vertical Lines
Diagonal Lines
Horizontal Lines
Configurations
Power supply, input devices, output devices, and conductors are all primary components of what?
Terminal Blocks
Printed Circuit Board
Configuration
Ladder Diagrams
Connecting the winding halves of a delta motor in parallel connects the motor for low voltage operations.
True
False
When sizing disconnect switches, the current or voltage rating should be less than the source's current and voltage
True
False
_________ are required to prevent shock hazards that occur from touching metallic parts of an electrical circuit.
Electrical Grounding Circuits
Printed Circuit Boards
Taxidermized Circuits
Fuses
When sizing disconnect switches, the current or voltage rating should equal or exceed the source's current or voltage.
True
False
Every panel and many external components in an electrical control system must be grounded connecting ground wire to the ___________.
Main Panel Enclosure
DC Power Ground Source
Control transformer Winding
Main Power Ground Conductor
The ____________ defines a set of requirements for conductors that are used in electrical panel grounding systems.
Occupational Safety and Health Administration
National Electrical Code
National Ssociation of Manufactueres
National electrical Contractors Association
When using a DMM to verify a grounding system, the measurement mode is set to what?
Voltage
Current
Resistance
0
Operation verification of a motor control system is done by verifying wiring connections and system operations.
Circuit Breaker Operations
Disconnect Voltage
Wiring Connections
Power Phase
Which of the following provides the channels that route wires between the components inside an electrical panel?
Fish Tape
Wireways
Terminal Blocks
Significant Routes
Before connecting a wire to an electrical panel component, it is important to first determine the what?
Wire Length
Wire Resistance
Wire Color
Wire Durability
When connecting wire to a screw terminal using the straight wire method, it is important to make sure that the terminal clamp is in contact with the _____.
Terminal Screw
Ground Wire
Bare Wire
Wire Insulation
If solid wire is nicked during the stripping process, a good practice is to what?
Cut and strip the wire again
Call your operator
Give up
Use a stronger wire
Wires are fed through conduit by hand or by using what?
Fish tape
Tweezers
Guantes
Machines
There are two common methods to identify wires that are run between panels. What is one of them?
(a)
Using _____is the best wire bundling method when there is more pace inside the panel.
Wireways
Wire Sleeves
Wire Ties
Wire Tape
What is used together with wire ties to bundle wire along the back of a panel?
Anchors
Wiring tape
Terminal Blocks
Tape Fish
When taping motor leads with wire having insulation rate 450 VAC, there should be how many layers of tape?
3
4
5
6
