Bissoy.com
Doctors Medicines MCQs Q&A

How many types of DC motor starters?

How many types of DC motor starters? Correct Answer 3

  • There are mainly 3 types of DC motor starters, such as 2 point starter, 3 point starter and 4 point starter.
  • The basic concept behind every DC motor starter is adding external resistance to the armature winding during starting.
  • 3 point starters and 4 point starters are used for starting dc shunt-wound motors and dc compound wound motors.
  • 2 point starter is used for starting dc series motors.
  • However, very small dc motors may be started directly by connecting them to the supply with the help of a contractor or a switch. It does not result in any harm because they gather speed quickly due to small rotor inertia.
  • In this case, the large starting current will die down quickly because of the fast rise in the back emf.

Related Questions

A coach must choose five starters from a team of 12 players. How many different ways canthe coach choose the starters ?
Consider the following statements: In the above figure, the curves pertain to the DC motor A. Speed vs Armature current characteristic of a DC shunt motor B. Torque vs Armature current characteristic of a DC shunt motor C. Speed vs Armature current characteristic of a DC series motor D. Torque vs Armature current characteristic of a DC series motor
In case of synchronous motor, which of the following are true? a. Synchronous motor is not self-starting b. If the rotor poles are excited by field current and the stator terminals are connected to AC supply, motor vibrates. c. Variable frequency supply is used to start synchronous motor. d. By using frequency converter, a synchronous motor can be brought from standstill to its desired speed.
In the following question, sentences of a paragraph have been jumbled and labelled as A, B, C and D. You are required to rearrange the jumbled sentences of the paragraph and mark your response accordingly by selecting the correct option. A: An induction motor can, therefore, be made without electrical connections to the rotor. B: Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable and economical. C: An induction motor's rotor can be either wound type or squirrel-cage type. D: An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding.
User level threads are threads that are visible to the programmer and are unknown to the kernel. The operating system kernel supports and manages kernel level threads. Three different types of models relate user and kernel level threads. Which of the following statements is/are true ? (a) (i) The Many - to - one model maps many user threads to one kernel thread (ii) The one - to - one model maps one user thread to one kernel thread (iii) The many - to - many model maps many user threads to smaller or equal kernel threads (b) (i) Many - to - one model maps many kernel threads to one user thread (ii) One - to - one model maps one kernel thread to one user thread (iii) Many - to- many model maps many kernel threads to smaller or equal user threads
The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type
The shunt motor starters that can be used is/are ___________
Starters are required in the induction motor because __________
Why starters are required in a DC motor?
A manufacturing company produces 5 types of chairs in two sizes - Regular" and "Large". The pie charts represent the total number of five types of chairs produced and the table shows the ratio between the number of regular sized and large sized chairs of five types. Type of Chair A B C D E Ration between Number of Regular Size and Large Size Chairs 3 : 2 4 : 5 3 : 1 5 : 3 3 : 8   If the total number of all types of chairs produced is 7200, what is the total number of regular size chairs of all types produced.