What is the main advantage of using a single-phase motor?

Low cost and simple construction

What principle does an induction motor operate on?

Interaction of two magnetic fields

Magnetic flux linkage with rotor coils

. In a synchronous motor, what happens if a load greater than the breakdown load is applied?

The motor becomes desynchronized

How do tracers operate when there is no current flowing through the communication?

They create a current thanks to a generator

They amplify the existing current.

They use a battery to create a current.

They cannot operate without current

They use solar power to create current

. What is the advantage of using 2-3 operating frequencies of the generator for "active" cable routing?

It allows determining the location of the cable without direct connection to the communication

It reduces the cost of the tracer

It makes the tracer more accurate.

It allows the tracer to locate cables that are buried deep underground.

It makes the tracer easier to use

What is the difference between the "Success ATG" and "Athlete TEK A" devices?

The “Success ATG” receiver is different than the “Athlete TEK A

The "Athlete TEK A" is more accurate than the "Success ATG".

The "Success ATG" is easier to use than the "Athlete TEK A

The "Athlete TEK A" has a longer battery life than the "Success ATG".

The "Success ATG" is more expensive than the "Athlete TEK A".

. What factors affect the EMF induced in the sensor?

Current distribution in the cable and the relative location of the sensor and cable.

The distance between the sensor and the cable.

The presence of other cables in the vicinity.

What factors affect the audibility of sound from the earth's surface?

Depth of the cable, soil density, type of damage, and power of the discharge pulse

The distance between the damage site and the listening point

The presence of other cables in the vicinity.

What is the principle of the thermal control method for detecting cable damage?

Detecting heat radiation from heated bodies.

Detecting changes in the magnetic field around the cable

Detecting changes in the electrical current flowing through the cable.

Detecting changes in the sound waves emitted by the cable.

Detecting changes vibrations of cable.

What is the purpose of using a 500-1000 Hz audio frequency generator in phase-to-phase damage search?

To detect phase-to-phase damage.

To generate a high voltage pulse to burn through the insulation.

To create a magnetic field that can be detected by a sensor.

To amplify the signal from the damaged cable.

To measure the resistance of the cable.

How does the signal intensity change when passing over a coupling and a damage point?

) Increases over the coupling, increases at the damage point, and disappears beyond the damage point

) It decreases over the coupling and increases at the damage point.

It increases over the coupling and decreases at the damage point

It remains the same over the coupling and the damage point.

It fluctuates randomly over the coupling and the damage point.

What is the principle of operation of a georadar?

The emission of ultra-wideband electromagnetic pulses into the probed medium and the registration of reflected signals from inhomogeneities and objects

Measuring the electrical resistance of the ground

Detecting changes in the magnetic field of the Earth

Using sound waves to create an image of the underground

Drilling holes in the ground and analyzing the soil samples.

What does a DC motor convert?

Mechanical energy into electrical energy

Direct current energy into mechanical energy

Alternating current energy into mechanical energy

Mechanical energy into direct current energy

Mechanical energy into alternating current energy

What role does the commutator play in a DC motor?

Reverses the current in each conductor as it passes from one pole to another

Converts mechanical energy into electrical energy

Generates the magnetic field in the motor

Supplies DC current to the motor

Provides a magnetic path to the main field flux

What is the function of the armature core?

Houses the windings in the slot

Produces a magnetic field when DC is passed through it

Receives DC from the main supply

How is the field winding connected in a shunt-wound DC motor?

Partly in series and partly in parallel with the armature

Connected to an external AC source

Not connected to the armature at all

What is the main function of the brushes in a DC motor?

Receive DC from the main supply and supply it to the armature winding

Support the armature and field winding

Distribute the main field flux uniformly

In a compound wound DC motor, how are the field windings connected?

One in series and one in parallel with the armature

Both in series with the armature

Both in parallel with the armature

Neither in series nor in parallel with the armature

Connected to an external AC source

What does the shaft of a DC motor do?

Provides support to the armature, windings, and commutator

Supports the bearings in which the armature rotates

Collects DC from brushes and converts it into AC

Houses the windings in the slot

What are the basic parts of a DC shunt motor?

Field windings (stator), a commutator, and an armature (rotor).

Field windings, battery, and commutator

Field windings, armature, and a transformer.

Commutator, stator, and a gearbox.

What happens when a DC shunt motor is turned ON?

DC flows across the entire stator as well as the rotor, creating two fields particularly the pole as well as the armature

The commutator reverses the current flow direction.

DC flows across the stator only

DC flows across the rotor only.

AC flows across the entire stator as well as the rotor

What is a characteristic of a shunt-wound motor?

It is incapable of running at a predetermined speed

It has a very expensive power supply

It is not suitable for industrial use.

It requires frequent maintenance

It is highly variable in speed without load adjustments.

Why is the power supply of a DC motor considered an advantage?

It is complex and hard to maintain

It requires constant adjustment

It is highly variable and unstable.

It is unreliable in industrial settings

What is the primary function of a DC series motor?

The primary function of a DC series motor is to convert electrical energy into mechanical energy

DC series motors are primarily used to generate electricity from mechanical energy

The main purpose of a DC series motor is to produce magnetic fields

DC series motors are designed to convert mechanical energy into thermal energy

DC series motors are primarily utilized for data processing tasks.

What effect does the initial application of an external voltage source have on the torque and speed of a DC series motor?

The torque and speed decrease initially due to low current in the winding

The torque and speed decrease due to high resistance in the armature and winding

The torque and speed remain constant regardless of the applied voltage.

The torque and speed increase indefinitely as voltage is applied

The torque and speed increase initially due to the strong magnetic field generated by the large current flow through the winding.

What is a notable advantage of DC series wound motors?

High starting torque, making them suitable for traction applications

Excellent speed control and regulation

Limited application due to single power supply compatibility.

Low starting torque compared to other motor types

Restricted power output for a given construction size.

What are advantages of a DC Compound Wound Motor?

Quick starting and stopping capability

Limited maintenance requirements

What is a disadvantage of a DC Compound Wound Motor?

Expensive operation and maintenance costs

Compatibility with hazardous environments

What is the function of the commutator in a DC shunt motor?

To reverse the direction of current flow in the armature windings

To regulate the voltage supplied to the armature

To control the speed of the motor

To transfer power from the stator to the rotor

To stabilize the magnetic fields in the motor

aman4eke

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It can operate on both AC and DC supply

It operates at variable speed

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253 questions

What are the two main parts of a 3-phase induction motor?

What is the main function of the stator in an induction motor?

How is the rotor of an induction motor connected to mechanical loads?

. What is the relation between the synchronous speed (Ns), frequency (f), and the number of poles (P) in an induction motor?

What type of rotor does a squirrel cage induction motor have?

Which law explains the induction of current in the rotor of an induction motor?

What is a key characteristic of a synchronous motor?

Which type of motor is most commonly used in domestic appliances?

What is the main advantage of using a single-phase motor?

What principle does an induction motor operate on?

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