Worksheetscoursera
Total questions: 20
Worksheet time: 10mins
In what units is the voltage of electric motors measured?
Ampere
Pendants
Voltacр
Hertz
Newtons
What is the electric current produced by generators?
1) Water flow in the river
1) Wind flow in the air
1) Directed movement of electrons
1) Attractive force
1) Division of atoms into electrons, protons and neutrons
What device is used to measure the electric current of electric motors?
Ammeter
Voltmeter
Wattmeter
Phase meter
Kenetron
Commutator motors allow:
Reduce engine dimensions
Reduce electrical energy losses
Smoothly change the rotor speed
Increase speed
Reduce speed
Commutator motors are used:
In the electric drive of machine tools
In car starters
In refrigerators
In electric transport devices
On wind generators
To convert alternating current to direct current, -
Engines
Generators
Rectifiers
Heating devices
Lighting fixtures
The rotors of commutator and asynchronous motors rotate under the influence of interaction forces:
Stator current and rotor current
Stator current and rotor voltage
Stator voltage and rotor voltage
Magnetic field of the stator with current in the winding from the rotor
Voltage at the motor input and current in the rotor winding
Scope of application of asynchronous motors:
Electric drive
Electric traction
For lighting purposes
For heating purposes
As transformers
Technical devices that use the electromagnetic action of electric current:
Electric motors and generators
Lighting fixtures
Heating devices
Power lines
Fuses
What is the electric current produced by generators?
Water flow in the river
Wind flow in the air
Directed movement of electrons
Attractive force
Division of atoms into electrons, protons and neutrons
Which converter is used to step up and step up power frequency voltage?
Rectifier
Transformer
Synchronous motor
Separator
Capacitor
What transformers are used to convert voltage suitable for domestic and industrial use?
Step-down transformers
Autotransformers
Oil transformers
Dry transformers
Step-up transformers
What is the name of the element of any electrical station that converts a non-electric quantity into an electrical one?
Engine
Generator
Transformer
Rectifiers
Frequency converter
What is the name of electrical equipment that uses an electrical quantity and converts it into a non-electric one?
Generator
Capacitor
Engine
Induction furnaces
Transformer
What is the difference between commutator motors and asynchronous motors?
Has its own collector
The rotor rotation frequency coincides with the rotation frequency of the stator magnetic field
The rotor rotation speed does not match the rotation frequency of the stator magnetic field
Ability to regulate motor speed
There is no correct answer
What engines are the most common in production and at home?
High frequency motors
Low-power electric motors
Powerful electric motors
Synchronous motors
Asynchronous electric motors
What electrical equipment is used to drive large synchronous electric motors that are difficult to start?
Synchronous electric motors
Asynchronous electric motors
Low-power electric motors
High frequency motors
Powerful electric motors
If the number of turns of the secondary winding exceeds the primary, then what will the transformer be called?
Step-down transformer
Step-up transformer
Incomprehensible transformer
Multi-frequency transformer
High voltage transformer
What words are associated with the word “Transformer”?
Transformation ratio
Oil drum
Squirrel wheel
Large gauge wires
There is no correct answer
What electric motors are used to compensate reactive power?
Asynchronous electric motors
Commutator motors
Synchronous motors
Multifunctional electric motors
Supersonic electric motors
