Question:
Which of the following is not a part of DC machine?
Which of the following is not a part of DC machine?
Show Hint
Remember: "Commutator = DC". If a machine has a commutator, it is almost certainly a DC machine. If it has "Damping/Damper windings", it's an AC Synchronous machine.
Updated On: Jul 1, 2026
- Armature
- Commutator
- Field winding
- Damping winding
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
A DC (Direct Current) machine, whether acting as a motor or a generator, consists of several essential components designed to facilitate the conversion between electrical and mechanical energy.
1. Standard Components of a DC Machine:
• Armature: The rotating part where the EMF is actually induced or where the torque is developed.
• Commutator: A unique feature of DC machines that acts as a mechanical rectifier, converting AC induced in the armature to DC for the external circuit.
• Field Winding: The stationary part (stator) that creates the necessary magnetic flux.
2. What is Damping Winding? Damping windings (or damper windings) are specifically used in
Synchronous Machines (AC machines). They consist of copper bars short-circuited at both ends, placed in the rotor pole faces. Their primary purpose is to prevent "hunting" (oscillations) and to help start synchronous motors.
3. Conclusion: Since damping windings are characteristic of AC synchronous machinery and serve no functional purpose in standard DC machine architecture, they are "not a part" of a DC machine.
• Armature: The rotating part where the EMF is actually induced or where the torque is developed.
• Commutator: A unique feature of DC machines that acts as a mechanical rectifier, converting AC induced in the armature to DC for the external circuit.
• Field Winding: The stationary part (stator) that creates the necessary magnetic flux.
2. What is Damping Winding? Damping windings (or damper windings) are specifically used in
Synchronous Machines (AC machines). They consist of copper bars short-circuited at both ends, placed in the rotor pole faces. Their primary purpose is to prevent "hunting" (oscillations) and to help start synchronous motors.
3. Conclusion: Since damping windings are characteristic of AC synchronous machinery and serve no functional purpose in standard DC machine architecture, they are "not a part" of a DC machine.
Was this answer helpful?
0
0
Top AP ECET EIE Electronics And Instrumentation Engineering Questions
- Correct form of Ohm's law is
- A 250 V DC generator is run at rated speed with no excitation. The open circuit voltage will be
- The direction of rotation of a DC motor can be determined by
- The basic function of a transformer is to change
- If $N_s$ is the synchronous speed, $N$ is the rotor speed and 's' is the slip then relation is
View More Questions
Top AP ECET EIE Electrical Machines Questions
Top AP ECET EIE Questions
- Order of the matrix $\begin{bmatrix} 1 & 6 \\ 2 & 0 \\ 7 & -1 \end{bmatrix}$ is
- If two rows (or columns) of a determinant of order 3 are identical then the value of determinant is
- Co-factor of -4 in $\begin{vmatrix} 1 & 2 & 3 \\ -4 & 3 & 6 \\ 2 & -7 & 9 \end{vmatrix}$ is
- The Matrix $\begin{bmatrix} a & h & g \\ h & b & f \\ g & f & c \end{bmatrix}$ is
- If $A = \begin{bmatrix} 0 & 0 & 1 \\ 0 & 1 & 0 \\ 1 & 0 & 0 \end{bmatrix}$ then $(A^{-1}) =$
View More Questions