Question: What is used to adjust the speed of a DC shunt motor?

In this method, speed variation is accomplished by means of a variable resistance inserted in series with the shunt field. An increase in controlling resistances reduces the field current with a reduction in flux and an increase in speed. This method of speed control is independent of load on the motor.

Which method is used to control the speed of DC shunt motor above normal speed Mcq?

This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “Speed Control Using Field Control of Shunt Motor”. Explanation: Speed of the DC motor is directly proportional to the back emf and inversely proportional to the flux produced by field.

What is the speed of DC motor?

DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors.

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What are the 3 types of DC motors?

There are 3 main types of DC motor that are available:- Series, Shunt and Compound. These terms relate to the type of connection of the field windings with respect to the armature circuit.

What are the advantages of DC shunt motor?

Advantages of Dc shunt motor:

  • The power supply of the DC motor is any way cheap.
  • Shunt would motor able to runs at a predetermined speed.
  • The speed of a dc shunt motor is sufficiently constant.
  • Direct current machines can use for heavy industrial applications where the torque and speed wider range.

What are the characteristics of DC shunt motor?

Characteristics of a DC Shunt Motor:

  • Speed-Armature Current Characteristic: …
  • Torque-Armature Current Characteristic: …
  • Speed-Torque Characteristic: …
  • Break in Field Circuit of a DC Motor:

Which starter is used for DC shunt motor?

A four-point starter is used to overcome this difficulty. A 4 point starter is used to start and control the speed of a Dc shunt motor with field weakening control.

Which motor has highest no load speed?

Explanation: At no load, armature current tends to zero, flux φ tends to zero, where speed is inversely proportional to the flux, speed will tend to infinity. Thus, no load speed of DC series motor is highest.

Which DC motor has self loading?

Which DC motor has got maximum self-loading property? Explanation: A differentially compound DC motor, flux reduces so sharply at small increase in load at higher values of load.

Can we change the direction of rotation of DC shunt motor?

The direction of rotation of DC shunt motor can be reversed by reversing either field terminals or armature terminals but not both. The torque can be changed by changing either field flux or armature current. Hence the motor will rotate in the same direction by changing the supply connections.

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Which DC motor is preferred for constant speed?

Explanation: Rotary compressor generally demand constant speed operation throughout the load. Sometimes, DC machines are not able to produce constant speed throughout the process hence, synchronous machine is used. 4.

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